JSONObject.java
package org.json;
/*
Public Domain.
*/
import java.io.Closeable;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.Locale;
import java.util.Map;
import java.util.Map.Entry;
import java.util.ResourceBundle;
import java.util.Set;
import java.util.regex.Pattern;
/**
* A JSONObject is an unordered collection of name/value pairs. Its external
* form is a string wrapped in curly braces with colons between the names and
* values, and commas between the values and names. The internal form is an
* object having <code>get</code> and <code>opt</code> methods for accessing
* the values by name, and <code>put</code> methods for adding or replacing
* values by name. The values can be any of these types: <code>Boolean</code>,
* <code>JSONArray</code>, <code>JSONObject</code>, <code>Number</code>,
* <code>String</code>, or the <code>JSONObject.NULL</code> object. A
* JSONObject constructor can be used to convert an external form JSON text
* into an internal form whose values can be retrieved with the
* <code>get</code> and <code>opt</code> methods, or to convert values into a
* JSON text using the <code>put</code> and <code>toString</code> methods. A
* <code>get</code> method returns a value if one can be found, and throws an
* exception if one cannot be found. An <code>opt</code> method returns a
* default value instead of throwing an exception, and so is useful for
* obtaining optional values.
* <p>
* The generic <code>get()</code> and <code>opt()</code> methods return an
* object, which you can cast or query for type. There are also typed
* <code>get</code> and <code>opt</code> methods that do type checking and type
* coercion for you. The opt methods differ from the get methods in that they
* do not throw. Instead, they return a specified value, such as null.
* <p>
* The <code>put</code> methods add or replace values in an object. For
* example,
*
* <pre>
* myString = new JSONObject()
* .put("JSON", "Hello, World!").toString();
* </pre>
*
* produces the string <code>{"JSON": "Hello, World"}</code>.
* <p>
* The texts produced by the <code>toString</code> methods strictly conform to
* the JSON syntax rules. The constructors are more forgiving in the texts they
* will accept:
* <ul>
* <li>An extra <code>,</code> <small>(comma)</small> may appear just
* before the closing brace.</li>
* <li>Strings may be quoted with <code>'</code> <small>(single
* quote)</small>.</li>
* <li>Strings do not need to be quoted at all if they do not begin with a
* quote or single quote, and if they do not contain leading or trailing
* spaces, and if they do not contain any of these characters:
* <code>{ } [ ] / \ : , #</code> and if they do not look like numbers and
* if they are not the reserved words <code>true</code>, <code>false</code>,
* or <code>null</code>.</li>
* </ul>
*
* @author JSON.org
* @version 2016-08-15
*/
public class JSONObject {
/**
* JSONObject.NULL is equivalent to the value that JavaScript calls null,
* whilst Java's null is equivalent to the value that JavaScript calls
* undefined.
*/
private static final class Null {
/**
* There is only intended to be a single instance of the NULL object,
* so the clone method returns itself.
*
* @return NULL.
*/
@Override
protected final Object clone() {
return this;
}
/**
* A Null object is equal to the null value and to itself.
*
* @param object
* An object to test for nullness.
* @return true if the object parameter is the JSONObject.NULL object or
* null.
*/
@Override
@SuppressWarnings("lgtm[java/unchecked-cast-in-equals]")
public boolean equals(Object object) {
return object == null || object == this;
}
/**
* A Null object is equal to the null value and to itself.
*
* @return always returns 0.
*/
@Override
public int hashCode() {
return 0;
}
/**
* Get the "null" string value.
*
* @return The string "null".
*/
@Override
public String toString() {
return "null";
}
}
/**
* Regular Expression Pattern that matches JSON Numbers. This is primarily used for
* output to guarantee that we are always writing valid JSON.
*/
static final Pattern NUMBER_PATTERN = Pattern.compile("-?(?:0|[1-9]\\d*)(?:\\.\\d+)?(?:[eE][+-]?\\d+)?");
/**
* The map where the JSONObject's properties are kept.
*/
private final Map<String, Object> map;
public Class<? extends Map> getMapType() {
return map.getClass();
}
/**
* It is sometimes more convenient and less ambiguous to have a
* <code>NULL</code> object than to use Java's <code>null</code> value.
* <code>JSONObject.NULL.equals(null)</code> returns <code>true</code>.
* <code>JSONObject.NULL.toString()</code> returns <code>"null"</code>.
*/
public static final Object NULL = new Null();
/**
* Construct an empty JSONObject.
*/
public JSONObject() {
// HashMap is used on purpose to ensure that elements are unordered by
// the specification.
// JSON tends to be a portable transfer format to allows the container
// implementations to rearrange their items for a faster element
// retrieval based on associative access.
// Therefore, an implementation mustn't rely on the order of the item.
this.map = new HashMap<String, Object>();
}
/**
* Construct a JSONObject from a subset of another JSONObject. An array of
* strings is used to identify the keys that should be copied. Missing keys
* are ignored.
*
* @param jo
* A JSONObject.
* @param names
* An array of strings.
*/
public JSONObject(JSONObject jo, String ... names) {
this(names.length);
for (int i = 0; i < names.length; i += 1) {
try {
this.putOnce(names[i], jo.opt(names[i]));
} catch (Exception ignore) {
}
}
}
/**
* Construct a JSONObject from a JSONTokener.
*
* @param x
* A JSONTokener object containing the source string.
* @throws JSONException
* If there is a syntax error in the source string or a
* duplicated key.
*/
public JSONObject(JSONTokener x) throws JSONException {
this();
char c;
String key;
if (x.nextClean() != '{') {
throw x.syntaxError("A JSONObject text must begin with '{'");
}
for (;;) {
char prev = x.getPrevious();
c = x.nextClean();
switch (c) {
case 0:
throw x.syntaxError("A JSONObject text must end with '}'");
case '}':
return;
case '{':
case '[':
if(prev=='{') {
throw x.syntaxError("A JSON Object can not directly nest another JSON Object or JSON Array.");
}
// fall through
default:
x.back();
key = x.nextValue().toString();
}
// The key is followed by ':'.
c = x.nextClean();
if (c != ':') {
throw x.syntaxError("Expected a ':' after a key");
}
// Use syntaxError(..) to include error location
if (key != null) {
// Check if key exists
if (this.opt(key) != null) {
// key already exists
throw x.syntaxError("Duplicate key \"" + key + "\"");
}
// Only add value if non-null
Object value = x.nextValue();
if (value!=null) {
this.put(key, value);
}
}
// Pairs are separated by ','.
switch (x.nextClean()) {
case ';':
case ',':
if (x.nextClean() == '}') {
return;
}
x.back();
break;
case '}':
return;
default:
throw x.syntaxError("Expected a ',' or '}'");
}
}
}
/**
* Construct a JSONObject from a Map.
*
* @param m
* A map object that can be used to initialize the contents of
* the JSONObject.
* @throws JSONException
* If a value in the map is non-finite number.
* @throws NullPointerException
* If a key in the map is <code>null</code>
*/
public JSONObject(Map<?, ?> m) {
if (m == null) {
this.map = new HashMap<String, Object>();
} else {
this.map = new HashMap<String, Object>(m.size());
for (final Entry<?, ?> e : m.entrySet()) {
if(e.getKey() == null) {
throw new NullPointerException("Null key.");
}
final Object value = e.getValue();
if (value != null) {
this.map.put(String.valueOf(e.getKey()), wrap(value));
}
}
}
}
/**
* Construct a JSONObject from an Object using bean getters. It reflects on
* all of the public methods of the object. For each of the methods with no
* parameters and a name starting with <code>"get"</code> or
* <code>"is"</code> followed by an uppercase letter, the method is invoked,
* and a key and the value returned from the getter method are put into the
* new JSONObject.
* <p>
* The key is formed by removing the <code>"get"</code> or <code>"is"</code>
* prefix. If the second remaining character is not upper case, then the
* first character is converted to lower case.
* <p>
* Methods that are <code>static</code>, return <code>void</code>,
* have parameters, or are "bridge" methods, are ignored.
* <p>
* For example, if an object has a method named <code>"getName"</code>, and
* if the result of calling <code>object.getName()</code> is
* <code>"Larry Fine"</code>, then the JSONObject will contain
* <code>"name": "Larry Fine"</code>.
* <p>
* The {@link JSONPropertyName} annotation can be used on a bean getter to
* override key name used in the JSONObject. For example, using the object
* above with the <code>getName</code> method, if we annotated it with:
* <pre>
* @JSONPropertyName("FullName")
* public String getName() { return this.name; }
* </pre>
* The resulting JSON object would contain <code>"FullName": "Larry Fine"</code>
* <p>
* Similarly, the {@link JSONPropertyName} annotation can be used on non-
* <code>get</code> and <code>is</code> methods. We can also override key
* name used in the JSONObject as seen below even though the field would normally
* be ignored:
* <pre>
* @JSONPropertyName("FullName")
* public String fullName() { return this.name; }
* </pre>
* The resulting JSON object would contain <code>"FullName": "Larry Fine"</code>
* <p>
* The {@link JSONPropertyIgnore} annotation can be used to force the bean property
* to not be serialized into JSON. If both {@link JSONPropertyIgnore} and
* {@link JSONPropertyName} are defined on the same method, a depth comparison is
* performed and the one closest to the concrete class being serialized is used.
* If both annotations are at the same level, then the {@link JSONPropertyIgnore}
* annotation takes precedent and the field is not serialized.
* For example, the following declaration would prevent the <code>getName</code>
* method from being serialized:
* <pre>
* @JSONPropertyName("FullName")
* @JSONPropertyIgnore
* public String getName() { return this.name; }
* </pre>
* <p>
*
* @param bean
* An object that has getter methods that should be used to make
* a JSONObject.
*/
public JSONObject(Object bean) {
this();
this.populateMap(bean);
}
private JSONObject(Object bean, Set<Object> objectsRecord) {
this();
this.populateMap(bean, objectsRecord);
}
/**
* Construct a JSONObject from an Object, using reflection to find the
* public members. The resulting JSONObject's keys will be the strings from
* the names array, and the values will be the field values associated with
* those keys in the object. If a key is not found or not visible, then it
* will not be copied into the new JSONObject.
*
* @param object
* An object that has fields that should be used to make a
* JSONObject.
* @param names
* An array of strings, the names of the fields to be obtained
* from the object.
*/
public JSONObject(Object object, String ... names) {
this(names.length);
Class<?> c = object.getClass();
for (int i = 0; i < names.length; i += 1) {
String name = names[i];
try {
this.putOpt(name, c.getField(name).get(object));
} catch (Exception ignore) {
}
}
}
/**
* Construct a JSONObject from a source JSON text string. This is the most
* commonly used JSONObject constructor.
*
* @param source
* A string beginning with <code>{</code> <small>(left
* brace)</small> and ending with <code>}</code>
* <small>(right brace)</small>.
* @exception JSONException
* If there is a syntax error in the source string or a
* duplicated key.
*/
public JSONObject(String source) throws JSONException {
this(new JSONTokener(source));
}
/**
* Construct a JSONObject from a ResourceBundle.
*
* @param baseName
* The ResourceBundle base name.
* @param locale
* The Locale to load the ResourceBundle for.
* @throws JSONException
* If any JSONExceptions are detected.
*/
public JSONObject(String baseName, Locale locale) throws JSONException {
this();
ResourceBundle bundle = ResourceBundle.getBundle(baseName, locale,
Thread.currentThread().getContextClassLoader());
// Iterate through the keys in the bundle.
Enumeration<String> keys = bundle.getKeys();
while (keys.hasMoreElements()) {
Object key = keys.nextElement();
if (key != null) {
// Go through the path, ensuring that there is a nested JSONObject for each
// segment except the last. Add the value using the last segment's name into
// the deepest nested JSONObject.
String[] path = ((String) key).split("\\.");
int last = path.length - 1;
JSONObject target = this;
for (int i = 0; i < last; i += 1) {
String segment = path[i];
JSONObject nextTarget = target.optJSONObject(segment);
if (nextTarget == null) {
nextTarget = new JSONObject();
target.put(segment, nextTarget);
}
target = nextTarget;
}
target.put(path[last], bundle.getString((String) key));
}
}
}
/**
* Constructor to specify an initial capacity of the internal map. Useful for library
* internal calls where we know, or at least can best guess, how big this JSONObject
* will be.
*
* @param initialCapacity initial capacity of the internal map.
*/
protected JSONObject(int initialCapacity){
this.map = new HashMap<String, Object>(initialCapacity);
}
/**
* Accumulate values under a key. It is similar to the put method except
* that if there is already an object stored under the key then a JSONArray
* is stored under the key to hold all of the accumulated values. If there
* is already a JSONArray, then the new value is appended to it. In
* contrast, the put method replaces the previous value.
*
* If only one value is accumulated that is not a JSONArray, then the result
* will be the same as using put. But if multiple values are accumulated,
* then the result will be like append.
*
* @param key
* A key string.
* @param value
* An object to be accumulated under the key.
* @return this.
* @throws JSONException
* If the value is non-finite number.
* @throws NullPointerException
* If the key is <code>null</code>.
*/
public JSONObject accumulate(String key, Object value) throws JSONException {
testValidity(value);
Object object = this.opt(key);
if (object == null) {
this.put(key,
value instanceof JSONArray ? new JSONArray().put(value)
: value);
} else if (object instanceof JSONArray) {
((JSONArray) object).put(value);
} else {
this.put(key, new JSONArray().put(object).put(value));
}
return this;
}
/**
* Append values to the array under a key. If the key does not exist in the
* JSONObject, then the key is put in the JSONObject with its value being a
* JSONArray containing the value parameter. If the key was already
* associated with a JSONArray, then the value parameter is appended to it.
*
* @param key
* A key string.
* @param value
* An object to be accumulated under the key.
* @return this.
* @throws JSONException
* If the value is non-finite number or if the current value associated with
* the key is not a JSONArray.
* @throws NullPointerException
* If the key is <code>null</code>.
*/
public JSONObject append(String key, Object value) throws JSONException {
testValidity(value);
Object object = this.opt(key);
if (object == null) {
this.put(key, new JSONArray().put(value));
} else if (object instanceof JSONArray) {
this.put(key, ((JSONArray) object).put(value));
} else {
throw wrongValueFormatException(key, "JSONArray", null, null);
}
return this;
}
/**
* Produce a string from a double. The string "null" will be returned if the
* number is not finite.
*
* @param d
* A double.
* @return A String.
*/
public static String doubleToString(double d) {
if (Double.isInfinite(d) || Double.isNaN(d)) {
return "null";
}
// Shave off trailing zeros and decimal point, if possible.
String string = Double.toString(d);
if (string.indexOf('.') > 0 && string.indexOf('e') < 0
&& string.indexOf('E') < 0) {
while (string.endsWith("0")) {
string = string.substring(0, string.length() - 1);
}
if (string.endsWith(".")) {
string = string.substring(0, string.length() - 1);
}
}
return string;
}
/**
* Get the value object associated with a key.
*
* @param key
* A key string.
* @return The object associated with the key.
* @throws JSONException
* if the key is not found.
*/
public Object get(String key) throws JSONException {
if (key == null) {
throw new JSONException("Null key.");
}
Object object = this.opt(key);
if (object == null) {
throw new JSONException("JSONObject[" + quote(key) + "] not found.");
}
return object;
}
/**
* Get the enum value associated with a key.
*
* @param <E>
* Enum Type
* @param clazz
* The type of enum to retrieve.
* @param key
* A key string.
* @return The enum value associated with the key
* @throws JSONException
* if the key is not found or if the value cannot be converted
* to an enum.
*/
public <E extends Enum<E>> E getEnum(Class<E> clazz, String key) throws JSONException {
E val = optEnum(clazz, key);
if(val==null) {
// JSONException should really take a throwable argument.
// If it did, I would re-implement this with the Enum.valueOf
// method and place any thrown exception in the JSONException
throw wrongValueFormatException(key, "enum of type " + quote(clazz.getSimpleName()), opt(key), null);
}
return val;
}
/**
* Get the boolean value associated with a key.
*
* @param key
* A key string.
* @return The truth.
* @throws JSONException
* if the value is not a Boolean or the String "true" or
* "false".
*/
public boolean getBoolean(String key) throws JSONException {
Object object = this.get(key);
if (object.equals(Boolean.FALSE)
|| (object instanceof String && ((String) object)
.equalsIgnoreCase("false"))) {
return false;
} else if (object.equals(Boolean.TRUE)
|| (object instanceof String && ((String) object)
.equalsIgnoreCase("true"))) {
return true;
}
throw wrongValueFormatException(key, "Boolean", object, null);
}
/**
* Get the BigInteger value associated with a key.
*
* @param key
* A key string.
* @return The numeric value.
* @throws JSONException
* if the key is not found or if the value cannot
* be converted to BigInteger.
*/
public BigInteger getBigInteger(String key) throws JSONException {
Object object = this.get(key);
BigInteger ret = objectToBigInteger(object, null);
if (ret != null) {
return ret;
}
throw wrongValueFormatException(key, "BigInteger", object, null);
}
/**
* Get the BigDecimal value associated with a key. If the value is float or
* double, the {@link BigDecimal#BigDecimal(double)} constructor will
* be used. See notes on the constructor for conversion issues that may
* arise.
*
* @param key
* A key string.
* @return The numeric value.
* @throws JSONException
* if the key is not found or if the value
* cannot be converted to BigDecimal.
*/
public BigDecimal getBigDecimal(String key) throws JSONException {
Object object = this.get(key);
BigDecimal ret = objectToBigDecimal(object, null);
if (ret != null) {
return ret;
}
throw wrongValueFormatException(key, "BigDecimal", object, null);
}
/**
* Get the double value associated with a key.
*
* @param key
* A key string.
* @return The numeric value.
* @throws JSONException
* if the key is not found or if the value is not a Number
* object and cannot be converted to a number.
*/
public double getDouble(String key) throws JSONException {
final Object object = this.get(key);
if(object instanceof Number) {
return ((Number)object).doubleValue();
}
try {
return Double.parseDouble(object.toString());
} catch (Exception e) {
throw wrongValueFormatException(key, "double", object, e);
}
}
/**
* Get the float value associated with a key.
*
* @param key
* A key string.
* @return The numeric value.
* @throws JSONException
* if the key is not found or if the value is not a Number
* object and cannot be converted to a number.
*/
public float getFloat(String key) throws JSONException {
final Object object = this.get(key);
if(object instanceof Number) {
return ((Number)object).floatValue();
}
try {
return Float.parseFloat(object.toString());
} catch (Exception e) {
throw wrongValueFormatException(key, "float", object, e);
}
}
/**
* Get the Number value associated with a key.
*
* @param key
* A key string.
* @return The numeric value.
* @throws JSONException
* if the key is not found or if the value is not a Number
* object and cannot be converted to a number.
*/
public Number getNumber(String key) throws JSONException {
Object object = this.get(key);
try {
if (object instanceof Number) {
return (Number)object;
}
return stringToNumber(object.toString());
} catch (Exception e) {
throw wrongValueFormatException(key, "number", object, e);
}
}
/**
* Get the int value associated with a key.
*
* @param key
* A key string.
* @return The integer value.
* @throws JSONException
* if the key is not found or if the value cannot be converted
* to an integer.
*/
public int getInt(String key) throws JSONException {
final Object object = this.get(key);
if(object instanceof Number) {
return ((Number)object).intValue();
}
try {
return Integer.parseInt(object.toString());
} catch (Exception e) {
throw wrongValueFormatException(key, "int", object, e);
}
}
/**
* Get the JSONArray value associated with a key.
*
* @param key
* A key string.
* @return A JSONArray which is the value.
* @throws JSONException
* if the key is not found or if the value is not a JSONArray.
*/
public JSONArray getJSONArray(String key) throws JSONException {
Object object = this.get(key);
if (object instanceof JSONArray) {
return (JSONArray) object;
}
throw wrongValueFormatException(key, "JSONArray", object, null);
}
/**
* Get the JSONObject value associated with a key.
*
* @param key
* A key string.
* @return A JSONObject which is the value.
* @throws JSONException
* if the key is not found or if the value is not a JSONObject.
*/
public JSONObject getJSONObject(String key) throws JSONException {
Object object = this.get(key);
if (object instanceof JSONObject) {
return (JSONObject) object;
}
throw wrongValueFormatException(key, "JSONObject", object, null);
}
/**
* Get the long value associated with a key.
*
* @param key
* A key string.
* @return The long value.
* @throws JSONException
* if the key is not found or if the value cannot be converted
* to a long.
*/
public long getLong(String key) throws JSONException {
final Object object = this.get(key);
if(object instanceof Number) {
return ((Number)object).longValue();
}
try {
return Long.parseLong(object.toString());
} catch (Exception e) {
throw wrongValueFormatException(key, "long", object, e);
}
}
/**
* Get an array of field names from a JSONObject.
*
* @param jo
* JSON object
* @return An array of field names, or null if there are no names.
*/
public static String[] getNames(JSONObject jo) {
if (jo.isEmpty()) {
return null;
}
return jo.keySet().toArray(new String[jo.length()]);
}
/**
* Get an array of public field names from an Object.
*
* @param object
* object to read
* @return An array of field names, or null if there are no names.
*/
public static String[] getNames(Object object) {
if (object == null) {
return null;
}
Class<?> klass = object.getClass();
Field[] fields = klass.getFields();
int length = fields.length;
if (length == 0) {
return null;
}
String[] names = new String[length];
for (int i = 0; i < length; i += 1) {
names[i] = fields[i].getName();
}
return names;
}
/**
* Get the string associated with a key.
*
* @param key
* A key string.
* @return A string which is the value.
* @throws JSONException
* if there is no string value for the key.
*/
public String getString(String key) throws JSONException {
Object object = this.get(key);
if (object instanceof String) {
return (String) object;
}
throw wrongValueFormatException(key, "string", object, null);
}
/**
* Determine if the JSONObject contains a specific key.
*
* @param key
* A key string.
* @return true if the key exists in the JSONObject.
*/
public boolean has(String key) {
return this.map.containsKey(key);
}
/**
* Increment a property of a JSONObject. If there is no such property,
* create one with a value of 1 (Integer). If there is such a property, and if it is
* an Integer, Long, Double, Float, BigInteger, or BigDecimal then add one to it.
* No overflow bounds checking is performed, so callers should initialize the key
* prior to this call with an appropriate type that can handle the maximum expected
* value.
*
* @param key
* A key string.
* @return this.
* @throws JSONException
* If there is already a property with this name that is not an
* Integer, Long, Double, or Float.
*/
public JSONObject increment(String key) throws JSONException {
Object value = this.opt(key);
if (value == null) {
this.put(key, 1);
} else if (value instanceof Integer) {
this.put(key, ((Integer) value).intValue() + 1);
} else if (value instanceof Long) {
this.put(key, ((Long) value).longValue() + 1L);
} else if (value instanceof BigInteger) {
this.put(key, ((BigInteger)value).add(BigInteger.ONE));
} else if (value instanceof Float) {
this.put(key, ((Float) value).floatValue() + 1.0f);
} else if (value instanceof Double) {
this.put(key, ((Double) value).doubleValue() + 1.0d);
} else if (value instanceof BigDecimal) {
this.put(key, ((BigDecimal)value).add(BigDecimal.ONE));
} else {
throw new JSONException("Unable to increment [" + quote(key) + "].");
}
return this;
}
/**
* Determine if the value associated with the key is <code>null</code> or if there is no
* value.
*
* @param key
* A key string.
* @return true if there is no value associated with the key or if the value
* is the JSONObject.NULL object.
*/
public boolean isNull(String key) {
return JSONObject.NULL.equals(this.opt(key));
}
/**
* Get an enumeration of the keys of the JSONObject. Modifying this key Set will also
* modify the JSONObject. Use with caution.
*
* @see Set#iterator()
*
* @return An iterator of the keys.
*/
public Iterator<String> keys() {
return this.keySet().iterator();
}
/**
* Get a set of keys of the JSONObject. Modifying this key Set will also modify the
* JSONObject. Use with caution.
*
* @see Map#keySet()
*
* @return A keySet.
*/
public Set<String> keySet() {
return this.map.keySet();
}
/**
* Get a set of entries of the JSONObject. These are raw values and may not
* match what is returned by the JSONObject get* and opt* functions. Modifying
* the returned EntrySet or the Entry objects contained therein will modify the
* backing JSONObject. This does not return a clone or a read-only view.
*
* Use with caution.
*
* @see Map#entrySet()
*
* @return An Entry Set
*/
protected Set<Entry<String, Object>> entrySet() {
return this.map.entrySet();
}
/**
* Get the number of keys stored in the JSONObject.
*
* @return The number of keys in the JSONObject.
*/
public int length() {
return this.map.size();
}
/**
* Removes all of the elements from this JSONObject.
* The JSONObject will be empty after this call returns.
*/
public void clear() {
this.map.clear();
}
/**
* Check if JSONObject is empty.
*
* @return true if JSONObject is empty, otherwise false.
*/
public boolean isEmpty() {
return this.map.isEmpty();
}
/**
* Produce a JSONArray containing the names of the elements of this
* JSONObject.
*
* @return A JSONArray containing the key strings, or null if the JSONObject
* is empty.
*/
public JSONArray names() {
if(this.map.isEmpty()) {
return null;
}
return new JSONArray(this.map.keySet());
}
/**
* Produce a string from a Number.
*
* @param number
* A Number
* @return A String.
* @throws JSONException
* If n is a non-finite number.
*/
public static String numberToString(Number number) throws JSONException {
if (number == null) {
throw new JSONException("Null pointer");
}
testValidity(number);
// Shave off trailing zeros and decimal point, if possible.
String string = number.toString();
if (string.indexOf('.') > 0 && string.indexOf('e') < 0
&& string.indexOf('E') < 0) {
while (string.endsWith("0")) {
string = string.substring(0, string.length() - 1);
}
if (string.endsWith(".")) {
string = string.substring(0, string.length() - 1);
}
}
return string;
}
/**
* Get an optional value associated with a key.
*
* @param key
* A key string.
* @return An object which is the value, or null if there is no value.
*/
public Object opt(String key) {
return key == null ? null : this.map.get(key);
}
/**
* Get the enum value associated with a key.
*
* @param <E>
* Enum Type
* @param clazz
* The type of enum to retrieve.
* @param key
* A key string.
* @return The enum value associated with the key or null if not found
*/
public <E extends Enum<E>> E optEnum(Class<E> clazz, String key) {
return this.optEnum(clazz, key, null);
}
/**
* Get the enum value associated with a key.
*
* @param <E>
* Enum Type
* @param clazz
* The type of enum to retrieve.
* @param key
* A key string.
* @param defaultValue
* The default in case the value is not found
* @return The enum value associated with the key or defaultValue
* if the value is not found or cannot be assigned to <code>clazz</code>
*/
public <E extends Enum<E>> E optEnum(Class<E> clazz, String key, E defaultValue) {
try {
Object val = this.opt(key);
if (NULL.equals(val)) {
return defaultValue;
}
if (clazz.isAssignableFrom(val.getClass())) {
// we just checked it!
@SuppressWarnings("unchecked")
E myE = (E) val;
return myE;
}
return Enum.valueOf(clazz, val.toString());
} catch (IllegalArgumentException e) {
return defaultValue;
} catch (NullPointerException e) {
return defaultValue;
}
}
/**
* Get an optional boolean associated with a key. It returns false if there
* is no such key, or if the value is not Boolean.TRUE or the String "true".
*
* @param key
* A key string.
* @return The truth.
*/
public boolean optBoolean(String key) {
return this.optBoolean(key, false);
}
/**
* Get an optional boolean associated with a key. It returns the
* defaultValue if there is no such key, or if it is not a Boolean or the
* String "true" or "false" (case insensitive).
*
* @param key
* A key string.
* @param defaultValue
* The default.
* @return The truth.
*/
public boolean optBoolean(String key, boolean defaultValue) {
Object val = this.opt(key);
if (NULL.equals(val)) {
return defaultValue;
}
if (val instanceof Boolean){
return ((Boolean) val).booleanValue();
}
try {
// we'll use the get anyway because it does string conversion.
return this.getBoolean(key);
} catch (Exception e) {
return defaultValue;
}
}
/**
* Get an optional BigDecimal associated with a key, or the defaultValue if
* there is no such key or if its value is not a number. If the value is a
* string, an attempt will be made to evaluate it as a number. If the value
* is float or double, then the {@link BigDecimal#BigDecimal(double)}
* constructor will be used. See notes on the constructor for conversion
* issues that may arise.
*
* @param key
* A key string.
* @param defaultValue
* The default.
* @return An object which is the value.
*/
public BigDecimal optBigDecimal(String key, BigDecimal defaultValue) {
Object val = this.opt(key);
return objectToBigDecimal(val, defaultValue);
}
/**
* @param val value to convert
* @param defaultValue default value to return is the conversion doesn't work or is null.
* @return BigDecimal conversion of the original value, or the defaultValue if unable
* to convert.
*/
static BigDecimal objectToBigDecimal(Object val, BigDecimal defaultValue) {
return objectToBigDecimal(val, defaultValue, true);
}
/**
* @param val value to convert
* @param defaultValue default value to return is the conversion doesn't work or is null.
* @param exact When <code>true</code>, then {@link Double} and {@link Float} values will be converted exactly.
* When <code>false</code>, they will be converted to {@link String} values before converting to {@link BigDecimal}.
* @return BigDecimal conversion of the original value, or the defaultValue if unable
* to convert.
*/
static BigDecimal objectToBigDecimal(Object val, BigDecimal defaultValue, boolean exact) {
if (NULL.equals(val)) {
return defaultValue;
}
if (val instanceof BigDecimal){
return (BigDecimal) val;
}
if (val instanceof BigInteger){
return new BigDecimal((BigInteger) val);
}
if (val instanceof Double || val instanceof Float){
if (!numberIsFinite((Number)val)) {
return defaultValue;
}
if (exact) {
return new BigDecimal(((Number)val).doubleValue());
}
// use the string constructor so that we maintain "nice" values for doubles and floats
// the double constructor will translate doubles to "exact" values instead of the likely
// intended representation
return new BigDecimal(val.toString());
}
if (val instanceof Long || val instanceof Integer
|| val instanceof Short || val instanceof Byte){
return new BigDecimal(((Number) val).longValue());
}
// don't check if it's a string in case of unchecked Number subclasses
try {
return new BigDecimal(val.toString());
} catch (Exception e) {
return defaultValue;
}
}
/**
* Get an optional BigInteger associated with a key, or the defaultValue if
* there is no such key or if its value is not a number. If the value is a
* string, an attempt will be made to evaluate it as a number.
*
* @param key
* A key string.
* @param defaultValue
* The default.
* @return An object which is the value.
*/
public BigInteger optBigInteger(String key, BigInteger defaultValue) {
Object val = this.opt(key);
return objectToBigInteger(val, defaultValue);
}
/**
* @param val value to convert
* @param defaultValue default value to return is the conversion doesn't work or is null.
* @return BigInteger conversion of the original value, or the defaultValue if unable
* to convert.
*/
static BigInteger objectToBigInteger(Object val, BigInteger defaultValue) {
if (NULL.equals(val)) {
return defaultValue;
}
if (val instanceof BigInteger){
return (BigInteger) val;
}
if (val instanceof BigDecimal){
return ((BigDecimal) val).toBigInteger();
}
if (val instanceof Double || val instanceof Float){
if (!numberIsFinite((Number)val)) {
return defaultValue;
}
return new BigDecimal(((Number) val).doubleValue()).toBigInteger();
}
if (val instanceof Long || val instanceof Integer
|| val instanceof Short || val instanceof Byte){
return BigInteger.valueOf(((Number) val).longValue());
}
// don't check if it's a string in case of unchecked Number subclasses
try {
// the other opt functions handle implicit conversions, i.e.
// jo.put("double",1.1d);
// jo.optInt("double"); -- will return 1, not an error
// this conversion to BigDecimal then to BigInteger is to maintain
// that type cast support that may truncate the decimal.
final String valStr = val.toString();
if(isDecimalNotation(valStr)) {
return new BigDecimal(valStr).toBigInteger();
}
return new BigInteger(valStr);
} catch (Exception e) {
return defaultValue;
}
}
/**
* Get an optional double associated with a key, or NaN if there is no such
* key or if its value is not a number. If the value is a string, an attempt
* will be made to evaluate it as a number.
*
* @param key
* A string which is the key.
* @return An object which is the value.
*/
public double optDouble(String key) {
return this.optDouble(key, Double.NaN);
}
/**
* Get an optional double associated with a key, or the defaultValue if
* there is no such key or if its value is not a number. If the value is a
* string, an attempt will be made to evaluate it as a number.
*
* @param key
* A key string.
* @param defaultValue
* The default.
* @return An object which is the value.
*/
public double optDouble(String key, double defaultValue) {
Number val = this.optNumber(key);
if (val == null) {
return defaultValue;
}
return val.doubleValue();
}
/**
* Get the optional double value associated with an index. NaN is returned
* if there is no value for the index, or if the value is not a number and
* cannot be converted to a number.
*
* @param key
* A key string.
* @return The value.
*/
public float optFloat(String key) {
return this.optFloat(key, Float.NaN);
}
/**
* Get the optional double value associated with an index. The defaultValue
* is returned if there is no value for the index, or if the value is not a
* number and cannot be converted to a number.
*
* @param key
* A key string.
* @param defaultValue
* The default value.
* @return The value.
*/
public float optFloat(String key, float defaultValue) {
Number val = this.optNumber(key);
if (val == null) {
return defaultValue;
}
final float floatValue = val.floatValue();
// if (Float.isNaN(floatValue) || Float.isInfinite(floatValue)) {
// return defaultValue;
// }
return floatValue;
}
/**
* Get an optional int value associated with a key, or zero if there is no
* such key or if the value is not a number. If the value is a string, an
* attempt will be made to evaluate it as a number.
*
* @param key
* A key string.
* @return An object which is the value.
*/
public int optInt(String key) {
return this.optInt(key, 0);
}
/**
* Get an optional int value associated with a key, or the default if there
* is no such key or if the value is not a number. If the value is a string,
* an attempt will be made to evaluate it as a number.
*
* @param key
* A key string.
* @param defaultValue
* The default.
* @return An object which is the value.
*/
public int optInt(String key, int defaultValue) {
final Number val = this.optNumber(key, null);
if (val == null) {
return defaultValue;
}
return val.intValue();
}
/**
* Get an optional JSONArray associated with a key. It returns null if there
* is no such key, or if its value is not a JSONArray.
*
* @param key
* A key string.
* @return A JSONArray which is the value.
*/
public JSONArray optJSONArray(String key) {
Object o = this.opt(key);
return o instanceof JSONArray ? (JSONArray) o : null;
}
/**
* Get an optional JSONObject associated with a key. It returns null if
* there is no such key, or if its value is not a JSONObject.
*
* @param key
* A key string.
* @return A JSONObject which is the value.
*/
public JSONObject optJSONObject(String key) { return this.optJSONObject(key, null); }
/**
* Get an optional JSONObject associated with a key, or the default if there
* is no such key or if the value is not a JSONObject.
*
* @param key
* A key string.
* @param defaultValue
* The default.
* @return An JSONObject which is the value.
*/
public JSONObject optJSONObject(String key, JSONObject defaultValue) {
Object object = this.opt(key);
return object instanceof JSONObject ? (JSONObject) object : defaultValue;
}
/**
* Get an optional long value associated with a key, or zero if there is no
* such key or if the value is not a number. If the value is a string, an
* attempt will be made to evaluate it as a number.
*
* @param key
* A key string.
* @return An object which is the value.
*/
public long optLong(String key) {
return this.optLong(key, 0);
}
/**
* Get an optional long value associated with a key, or the default if there
* is no such key or if the value is not a number. If the value is a string,
* an attempt will be made to evaluate it as a number.
*
* @param key
* A key string.
* @param defaultValue
* The default.
* @return An object which is the value.
*/
public long optLong(String key, long defaultValue) {
final Number val = this.optNumber(key, null);
if (val == null) {
return defaultValue;
}
return val.longValue();
}
/**
* Get an optional {@link Number} value associated with a key, or <code>null</code>
* if there is no such key or if the value is not a number. If the value is a string,
* an attempt will be made to evaluate it as a number ({@link BigDecimal}). This method
* would be used in cases where type coercion of the number value is unwanted.
*
* @param key
* A key string.
* @return An object which is the value.
*/
public Number optNumber(String key) {
return this.optNumber(key, null);
}
/**
* Get an optional {@link Number} value associated with a key, or the default if there
* is no such key or if the value is not a number. If the value is a string,
* an attempt will be made to evaluate it as a number. This method
* would be used in cases where type coercion of the number value is unwanted.
*
* @param key
* A key string.
* @param defaultValue
* The default.
* @return An object which is the value.
*/
public Number optNumber(String key, Number defaultValue) {
Object val = this.opt(key);
if (NULL.equals(val)) {
return defaultValue;
}
if (val instanceof Number){
return (Number) val;
}
try {
return stringToNumber(val.toString());
} catch (Exception e) {
return defaultValue;
}
}
/**
* Get an optional string associated with a key. It returns an empty string
* if there is no such key. If the value is not a string and is not null,
* then it is converted to a string.
*
* @param key
* A key string.
* @return A string which is the value.
*/
public String optString(String key) {
return this.optString(key, "");
}
/**
* Get an optional string associated with a key. It returns the defaultValue
* if there is no such key.
*
* @param key
* A key string.
* @param defaultValue
* The default.
* @return A string which is the value.
*/
public String optString(String key, String defaultValue) {
Object object = this.opt(key);
return NULL.equals(object) ? defaultValue : object.toString();
}
/**
* Populates the internal map of the JSONObject with the bean properties. The
* bean can not be recursive.
*
* @see JSONObject#JSONObject(Object)
*
* @param bean
* the bean
*/
private void populateMap(Object bean) {
populateMap(bean, Collections.newSetFromMap(new IdentityHashMap<Object, Boolean>()));
}
private void populateMap(Object bean, Set<Object> objectsRecord) {
Class<?> klass = bean.getClass();
// If klass is a System class then set includeSuperClass to false.
boolean includeSuperClass = klass.getClassLoader() != null;
Method[] methods = includeSuperClass ? klass.getMethods() : klass.getDeclaredMethods();
for (final Method method : methods) {
final int modifiers = method.getModifiers();
if (Modifier.isPublic(modifiers)
&& !Modifier.isStatic(modifiers)
&& method.getParameterTypes().length == 0
&& !method.isBridge()
&& method.getReturnType() != Void.TYPE
&& isValidMethodName(method.getName())) {
final String key = getKeyNameFromMethod(method);
if (key != null && !key.isEmpty()) {
try {
final Object result = method.invoke(bean);
if (result != null) {
// check cyclic dependency and throw error if needed
// the wrap and populateMap combination method is
// itself DFS recursive
if (objectsRecord.contains(result)) {
throw recursivelyDefinedObjectException(key);
}
objectsRecord.add(result);
this.map.put(key, wrap(result, objectsRecord));
objectsRecord.remove(result);
// we don't use the result anywhere outside of wrap
// if it's a resource we should be sure to close it
// after calling toString
if (result instanceof Closeable) {
try {
((Closeable) result).close();
} catch (IOException ignore) {
}
}
}
} catch (IllegalAccessException ignore) {
} catch (IllegalArgumentException ignore) {
} catch (InvocationTargetException ignore) {
}
}
}
}
}
private static boolean isValidMethodName(String name) {
return !"getClass".equals(name) && !"getDeclaringClass".equals(name);
}
private static String getKeyNameFromMethod(Method method) {
final int ignoreDepth = getAnnotationDepth(method, JSONPropertyIgnore.class);
if (ignoreDepth > 0) {
final int forcedNameDepth = getAnnotationDepth(method, JSONPropertyName.class);
if (forcedNameDepth < 0 || ignoreDepth <= forcedNameDepth) {
// the hierarchy asked to ignore, and the nearest name override
// was higher or non-existent
return null;
}
}
JSONPropertyName annotation = getAnnotation(method, JSONPropertyName.class);
if (annotation != null && annotation.value() != null && !annotation.value().isEmpty()) {
return annotation.value();
}
String key;
final String name = method.getName();
if (name.startsWith("get") && name.length() > 3) {
key = name.substring(3);
} else if (name.startsWith("is") && name.length() > 2) {
key = name.substring(2);
} else {
return null;
}
// if the first letter in the key is not uppercase, then skip.
// This is to maintain backwards compatibility before PR406
// (https://github.com/stleary/JSON-java/pull/406/)
if (key.length() == 0 || Character.isLowerCase(key.charAt(0))) {
return null;
}
if (key.length() == 1) {
key = key.toLowerCase(Locale.ROOT);
} else if (!Character.isUpperCase(key.charAt(1))) {
key = key.substring(0, 1).toLowerCase(Locale.ROOT) + key.substring(1);
}
return key;
}
/**
* Searches the class hierarchy to see if the method or it's super
* implementations and interfaces has the annotation.
*
* @param <A>
* type of the annotation
*
* @param m
* method to check
* @param annotationClass
* annotation to look for
* @return the {@link Annotation} if the annotation exists on the current method
* or one of its super class definitions
*/
private static <A extends Annotation> A getAnnotation(final Method m, final Class<A> annotationClass) {
// if we have invalid data the result is null
if (m == null || annotationClass == null) {
return null;
}
if (m.isAnnotationPresent(annotationClass)) {
return m.getAnnotation(annotationClass);
}
// if we've already reached the Object class, return null;
Class<?> c = m.getDeclaringClass();
if (c.getSuperclass() == null) {
return null;
}
// check directly implemented interfaces for the method being checked
for (Class<?> i : c.getInterfaces()) {
try {
Method im = i.getMethod(m.getName(), m.getParameterTypes());
return getAnnotation(im, annotationClass);
} catch (final SecurityException ex) {
continue;
} catch (final NoSuchMethodException ex) {
continue;
}
}
try {
return getAnnotation(
c.getSuperclass().getMethod(m.getName(), m.getParameterTypes()),
annotationClass);
} catch (final SecurityException ex) {
return null;
} catch (final NoSuchMethodException ex) {
return null;
}
}
/**
* Searches the class hierarchy to see if the method or it's super
* implementations and interfaces has the annotation. Returns the depth of the
* annotation in the hierarchy.
*
* @param m
* method to check
* @param annotationClass
* annotation to look for
* @return Depth of the annotation or -1 if the annotation is not on the method.
*/
private static int getAnnotationDepth(final Method m, final Class<? extends Annotation> annotationClass) {
// if we have invalid data the result is -1
if (m == null || annotationClass == null) {
return -1;
}
if (m.isAnnotationPresent(annotationClass)) {
return 1;
}
// if we've already reached the Object class, return -1;
Class<?> c = m.getDeclaringClass();
if (c.getSuperclass() == null) {
return -1;
}
// check directly implemented interfaces for the method being checked
for (Class<?> i : c.getInterfaces()) {
try {
Method im = i.getMethod(m.getName(), m.getParameterTypes());
int d = getAnnotationDepth(im, annotationClass);
if (d > 0) {
// since the annotation was on the interface, add 1
return d + 1;
}
} catch (final SecurityException ex) {
continue;
} catch (final NoSuchMethodException ex) {
continue;
}
}
try {
int d = getAnnotationDepth(
c.getSuperclass().getMethod(m.getName(), m.getParameterTypes()),
annotationClass);
if (d > 0) {
// since the annotation was on the superclass, add 1
return d + 1;
}
return -1;
} catch (final SecurityException ex) {
return -1;
} catch (final NoSuchMethodException ex) {
return -1;
}
}
/**
* Put a key/boolean pair in the JSONObject.
*
* @param key
* A key string.
* @param value
* A boolean which is the value.
* @return this.
* @throws JSONException
* If the value is non-finite number.
* @throws NullPointerException
* If the key is <code>null</code>.
*/
public JSONObject put(String key, boolean value) throws JSONException {
return this.put(key, value ? Boolean.TRUE : Boolean.FALSE);
}
/**
* Put a key/value pair in the JSONObject, where the value will be a
* JSONArray which is produced from a Collection.
*
* @param key
* A key string.
* @param value
* A Collection value.
* @return this.
* @throws JSONException
* If the value is non-finite number.
* @throws NullPointerException
* If the key is <code>null</code>.
*/
public JSONObject put(String key, Collection<?> value) throws JSONException {
return this.put(key, new JSONArray(value));
}
/**
* Put a key/double pair in the JSONObject.
*
* @param key
* A key string.
* @param value
* A double which is the value.
* @return this.
* @throws JSONException
* If the value is non-finite number.
* @throws NullPointerException
* If the key is <code>null</code>.
*/
public JSONObject put(String key, double value) throws JSONException {
return this.put(key, Double.valueOf(value));
}
/**
* Put a key/float pair in the JSONObject.
*
* @param key
* A key string.
* @param value
* A float which is the value.
* @return this.
* @throws JSONException
* If the value is non-finite number.
* @throws NullPointerException
* If the key is <code>null</code>.
*/
public JSONObject put(String key, float value) throws JSONException {
return this.put(key, Float.valueOf(value));
}
/**
* Put a key/int pair in the JSONObject.
*
* @param key
* A key string.
* @param value
* An int which is the value.
* @return this.
* @throws JSONException
* If the value is non-finite number.
* @throws NullPointerException
* If the key is <code>null</code>.
*/
public JSONObject put(String key, int value) throws JSONException {
return this.put(key, Integer.valueOf(value));
}
/**
* Put a key/long pair in the JSONObject.
*
* @param key
* A key string.
* @param value
* A long which is the value.
* @return this.
* @throws JSONException
* If the value is non-finite number.
* @throws NullPointerException
* If the key is <code>null</code>.
*/
public JSONObject put(String key, long value) throws JSONException {
return this.put(key, Long.valueOf(value));
}
/**
* Put a key/value pair in the JSONObject, where the value will be a
* JSONObject which is produced from a Map.
*
* @param key
* A key string.
* @param value
* A Map value.
* @return this.
* @throws JSONException
* If the value is non-finite number.
* @throws NullPointerException
* If the key is <code>null</code>.
*/
public JSONObject put(String key, Map<?, ?> value) throws JSONException {
return this.put(key, new JSONObject(value));
}
/**
* Put a key/value pair in the JSONObject. If the value is <code>null</code>, then the
* key will be removed from the JSONObject if it is present.
*
* @param key
* A key string.
* @param value
* An object which is the value. It should be of one of these
* types: Boolean, Double, Integer, JSONArray, JSONObject, Long,
* String, or the JSONObject.NULL object.
* @return this.
* @throws JSONException
* If the value is non-finite number.
* @throws NullPointerException
* If the key is <code>null</code>.
*/
public JSONObject put(String key, Object value) throws JSONException {
if (key == null) {
throw new NullPointerException("Null key.");
}
if (value != null) {
testValidity(value);
this.map.put(key, value);
} else {
this.remove(key);
}
return this;
}
/**
* Put a key/value pair in the JSONObject, but only if the key and the value
* are both non-null, and only if there is not already a member with that
* name.
*
* @param key
* key to insert into
* @param value
* value to insert
* @return this.
* @throws JSONException
* if the key is a duplicate
*/
public JSONObject putOnce(String key, Object value) throws JSONException {
if (key != null && value != null) {
if (this.opt(key) != null) {
throw new JSONException("Duplicate key \"" + key + "\"");
}
return this.put(key, value);
}
return this;
}
/**
* Put a key/value pair in the JSONObject, but only if the key and the value
* are both non-null.
*
* @param key
* A key string.
* @param value
* An object which is the value. It should be of one of these
* types: Boolean, Double, Integer, JSONArray, JSONObject, Long,
* String, or the JSONObject.NULL object.
* @return this.
* @throws JSONException
* If the value is a non-finite number.
*/
public JSONObject putOpt(String key, Object value) throws JSONException {
if (key != null && value != null) {
return this.put(key, value);
}
return this;
}
/**
* Creates a JSONPointer using an initialization string and tries to
* match it to an item within this JSONObject. For example, given a
* JSONObject initialized with this document:
* <pre>
* {
* "a":{"b":"c"}
* }
* </pre>
* and this JSONPointer string:
* <pre>
* "/a/b"
* </pre>
* Then this method will return the String "c".
* A JSONPointerException may be thrown from code called by this method.
*
* @param jsonPointer string that can be used to create a JSONPointer
* @return the item matched by the JSONPointer, otherwise null
*/
public Object query(String jsonPointer) {
return query(new JSONPointer(jsonPointer));
}
/**
* Uses a user initialized JSONPointer and tries to
* match it to an item within this JSONObject. For example, given a
* JSONObject initialized with this document:
* <pre>
* {
* "a":{"b":"c"}
* }
* </pre>
* and this JSONPointer:
* <pre>
* "/a/b"
* </pre>
* Then this method will return the String "c".
* A JSONPointerException may be thrown from code called by this method.
*
* @param jsonPointer string that can be used to create a JSONPointer
* @return the item matched by the JSONPointer, otherwise null
*/
public Object query(JSONPointer jsonPointer) {
return jsonPointer.queryFrom(this);
}
/**
* Queries and returns a value from this object using {@code jsonPointer}, or
* returns null if the query fails due to a missing key.
*
* @param jsonPointer the string representation of the JSON pointer
* @return the queried value or {@code null}
* @throws IllegalArgumentException if {@code jsonPointer} has invalid syntax
*/
public Object optQuery(String jsonPointer) {
return optQuery(new JSONPointer(jsonPointer));
}
/**
* Queries and returns a value from this object using {@code jsonPointer}, or
* returns null if the query fails due to a missing key.
*
* @param jsonPointer The JSON pointer
* @return the queried value or {@code null}
* @throws IllegalArgumentException if {@code jsonPointer} has invalid syntax
*/
public Object optQuery(JSONPointer jsonPointer) {
try {
return jsonPointer.queryFrom(this);
} catch (JSONPointerException e) {
return null;
}
}
/**
* Produce a string in double quotes with backslash sequences in all the
* right places. A backslash will be inserted within </, producing
* <\/, allowing JSON text to be delivered in HTML. In JSON text, a
* string cannot contain a control character or an unescaped quote or
* backslash.
*
* @param string
* A String
* @return A String correctly formatted for insertion in a JSON text.
*/
@SuppressWarnings("resource")
public static String quote(String string) {
StringWriter sw = new StringWriter();
synchronized (sw.getBuffer()) {
try {
return quote(string, sw).toString();
} catch (IOException ignored) {
// will never happen - we are writing to a string writer
return "";
}
}
}
public static Writer quote(String string, Writer w) throws IOException {
if (string == null || string.isEmpty()) {
w.write("\"\"");
return w;
}
char b;
char c = 0;
String hhhh;
int i;
int len = string.length();
w.write('"');
for (i = 0; i < len; i += 1) {
b = c;
c = string.charAt(i);
switch (c) {
case '\\':
case '"':
w.write('\\');
w.write(c);
break;
case '/':
if (b == '<') {
w.write('\\');
}
w.write(c);
break;
case '\b':
w.write("\\b");
break;
case '\t':
w.write("\\t");
break;
case '\n':
w.write("\\n");
break;
case '\f':
w.write("\\f");
break;
case '\r':
w.write("\\r");
break;
default:
if (c < ' ' || (c >= '\u0080' && c < '\u00a0')
|| (c >= '\u2000' && c < '\u2100')) {
w.write("\\u");
hhhh = Integer.toHexString(c);
w.write("0000", 0, 4 - hhhh.length());
w.write(hhhh);
} else {
w.write(c);
}
}
}
w.write('"');
return w;
}
/**
* Remove a name and its value, if present.
*
* @param key
* The name to be removed.
* @return The value that was associated with the name, or null if there was
* no value.
*/
public Object remove(String key) {
return this.map.remove(key);
}
/**
* Determine if two JSONObjects are similar.
* They must contain the same set of names which must be associated with
* similar values.
*
* @param other The other JSONObject
* @return true if they are equal
*/
public boolean similar(Object other) {
try {
if (!(other instanceof JSONObject)) {
return false;
}
if (!this.keySet().equals(((JSONObject)other).keySet())) {
return false;
}
for (final Entry<String,?> entry : this.entrySet()) {
String name = entry.getKey();
Object valueThis = entry.getValue();
Object valueOther = ((JSONObject)other).get(name);
if(valueThis == valueOther) {
continue;
}
if(valueThis == null) {
return false;
}
if (valueThis instanceof JSONObject) {
if (!((JSONObject)valueThis).similar(valueOther)) {
return false;
}
} else if (valueThis instanceof JSONArray) {
if (!((JSONArray)valueThis).similar(valueOther)) {
return false;
}
} else if (valueThis instanceof Number && valueOther instanceof Number) {
if (!isNumberSimilar((Number)valueThis, (Number)valueOther)) {
return false;
}
} else if (valueThis instanceof JSONString && valueOther instanceof JSONString) {
if (!((JSONString) valueThis).toJSONString().equals(((JSONString) valueOther).toJSONString())) {
return false;
}
} else if (!valueThis.equals(valueOther)) {
return false;
}
}
return true;
} catch (Throwable exception) {
return false;
}
}
/**
* Compares two numbers to see if they are similar.
*
* If either of the numbers are Double or Float instances, then they are checked to have
* a finite value. If either value is not finite (NaN or ±infinity), then this
* function will always return false. If both numbers are finite, they are first checked
* to be the same type and implement {@link Comparable}. If they do, then the actual
* {@link Comparable#compareTo(Object)} is called. If they are not the same type, or don't
* implement Comparable, then they are converted to {@link BigDecimal}s. Finally the
* BigDecimal values are compared using {@link BigDecimal#compareTo(BigDecimal)}.
*
* @param l the Left value to compare. Can not be <code>null</code>.
* @param r the right value to compare. Can not be <code>null</code>.
* @return true if the numbers are similar, false otherwise.
*/
static boolean isNumberSimilar(Number l, Number r) {
if (!numberIsFinite(l) || !numberIsFinite(r)) {
// non-finite numbers are never similar
return false;
}
// if the classes are the same and implement Comparable
// then use the built in compare first.
if(l.getClass().equals(r.getClass()) && l instanceof Comparable) {
@SuppressWarnings({ "rawtypes", "unchecked" })
int compareTo = ((Comparable)l).compareTo(r);
return compareTo==0;
}
// BigDecimal should be able to handle all of our number types that we support through
// documentation. Convert to BigDecimal first, then use the Compare method to
// decide equality.
final BigDecimal lBigDecimal = objectToBigDecimal(l, null, false);
final BigDecimal rBigDecimal = objectToBigDecimal(r, null, false);
if (lBigDecimal == null || rBigDecimal == null) {
return false;
}
return lBigDecimal.compareTo(rBigDecimal) == 0;
}
private static boolean numberIsFinite(Number n) {
if (n instanceof Double && (((Double) n).isInfinite() || ((Double) n).isNaN())) {
return false;
} else if (n instanceof Float && (((Float) n).isInfinite() || ((Float) n).isNaN())) {
return false;
}
return true;
}
/**
* Tests if the value should be tried as a decimal. It makes no test if there are actual digits.
*
* @param val value to test
* @return true if the string is "-0" or if it contains '.', 'e', or 'E', false otherwise.
*/
protected static boolean isDecimalNotation(final String val) {
return val.indexOf('.') > -1 || val.indexOf('e') > -1
|| val.indexOf('E') > -1 || "-0".equals(val);
}
/**
* Converts a string to a number using the narrowest possible type. Possible
* returns for this function are BigDecimal, Double, BigInteger, Long, and Integer.
* When a Double is returned, it should always be a valid Double and not NaN or +-infinity.
*
* @param val value to convert
* @return Number representation of the value.
* @throws NumberFormatException thrown if the value is not a valid number. A public
* caller should catch this and wrap it in a {@link JSONException} if applicable.
*/
protected static Number stringToNumber(final String val) throws NumberFormatException {
char initial = val.charAt(0);
if ((initial >= '0' && initial <= '9') || initial == '-') {
// decimal representation
if (isDecimalNotation(val)) {
// Use a BigDecimal all the time so we keep the original
// representation. BigDecimal doesn't support -0.0, ensure we
// keep that by forcing a decimal.
try {
BigDecimal bd = new BigDecimal(val);
if(initial == '-' && BigDecimal.ZERO.compareTo(bd)==0) {
return Double.valueOf(-0.0);
}
return bd;
} catch (NumberFormatException retryAsDouble) {
// this is to support "Hex Floats" like this: 0x1.0P-1074
try {
Double d = Double.valueOf(val);
if(d.isNaN() || d.isInfinite()) {
throw new NumberFormatException("val ["+val+"] is not a valid number.");
}
return d;
} catch (NumberFormatException ignore) {
throw new NumberFormatException("val ["+val+"] is not a valid number.");
}
}
}
// block items like 00 01 etc. Java number parsers treat these as Octal.
if(initial == '0' && val.length() > 1) {
char at1 = val.charAt(1);
if(at1 >= '0' && at1 <= '9') {
throw new NumberFormatException("val ["+val+"] is not a valid number.");
}
} else if (initial == '-' && val.length() > 2) {
char at1 = val.charAt(1);
char at2 = val.charAt(2);
if(at1 == '0' && at2 >= '0' && at2 <= '9') {
throw new NumberFormatException("val ["+val+"] is not a valid number.");
}
}
// integer representation.
// This will narrow any values to the smallest reasonable Object representation
// (Integer, Long, or BigInteger)
// BigInteger down conversion: We use a similar bitLength compare as
// BigInteger#intValueExact uses. Increases GC, but objects hold
// only what they need. i.e. Less runtime overhead if the value is
// long lived.
BigInteger bi = new BigInteger(val);
if(bi.bitLength() <= 31){
return Integer.valueOf(bi.intValue());
}
if(bi.bitLength() <= 63){
return Long.valueOf(bi.longValue());
}
return bi;
}
throw new NumberFormatException("val ["+val+"] is not a valid number.");
}
/**
* Try to convert a string into a number, boolean, or null. If the string
* can't be converted, return the string.
*
* @param string
* A String. can not be null.
* @return A simple JSON value.
* @throws NullPointerException
* Thrown if the string is null.
*/
// Changes to this method must be copied to the corresponding method in
// the XML class to keep full support for Android
public static Object stringToValue(String string) {
if ("".equals(string)) {
return string;
}
// check JSON key words true/false/null
if ("true".equalsIgnoreCase(string)) {
return Boolean.TRUE;
}
if ("false".equalsIgnoreCase(string)) {
return Boolean.FALSE;
}
if ("null".equalsIgnoreCase(string)) {
return JSONObject.NULL;
}
/*
* If it might be a number, try converting it. If a number cannot be
* produced, then the value will just be a string.
*/
char initial = string.charAt(0);
if ((initial >= '0' && initial <= '9') || initial == '-') {
try {
return stringToNumber(string);
} catch (Exception ignore) {
}
}
return string;
}
/**
* Throw an exception if the object is a NaN or infinite number.
*
* @param o
* The object to test.
* @throws JSONException
* If o is a non-finite number.
*/
public static void testValidity(Object o) throws JSONException {
if (o instanceof Number && !numberIsFinite((Number) o)) {
throw new JSONException("JSON does not allow non-finite numbers.");
}
}
/**
* Produce a JSONArray containing the values of the members of this
* JSONObject.
*
* @param names
* A JSONArray containing a list of key strings. This determines
* the sequence of the values in the result.
* @return A JSONArray of values.
* @throws JSONException
* If any of the values are non-finite numbers.
*/
public JSONArray toJSONArray(JSONArray names) throws JSONException {
if (names == null || names.isEmpty()) {
return null;
}
JSONArray ja = new JSONArray();
for (int i = 0; i < names.length(); i += 1) {
ja.put(this.opt(names.getString(i)));
}
return ja;
}
/**
* Make a JSON text of this JSONObject. For compactness, no whitespace is
* added. If this would not result in a syntactically correct JSON text,
* then null will be returned instead.
* <p><b>
* Warning: This method assumes that the data structure is acyclical.
* </b>
*
* @return a printable, displayable, portable, transmittable representation
* of the object, beginning with <code>{</code> <small>(left
* brace)</small> and ending with <code>}</code> <small>(right
* brace)</small>.
*/
@Override
public String toString() {
try {
return this.toString(0);
} catch (Exception e) {
return null;
}
}
/**
* Make a pretty-printed JSON text of this JSONObject.
*
* <p>If <pre>{@code indentFactor > 0}</pre> and the {@link JSONObject}
* has only one key, then the object will be output on a single line:
* <pre>{@code {"key": 1}}</pre>
*
* <p>If an object has 2 or more keys, then it will be output across
* multiple lines: <pre>{@code {
* "key1": 1,
* "key2": "value 2",
* "key3": 3
* }}</pre>
* <p><b>
* Warning: This method assumes that the data structure is acyclical.
* </b>
*
* @param indentFactor
* The number of spaces to add to each level of indentation.
* @return a printable, displayable, portable, transmittable representation
* of the object, beginning with <code>{</code> <small>(left
* brace)</small> and ending with <code>}</code> <small>(right
* brace)</small>.
* @throws JSONException
* If the object contains an invalid number.
*/
@SuppressWarnings("resource")
public String toString(int indentFactor) throws JSONException {
StringWriter w = new StringWriter();
synchronized (w.getBuffer()) {
return this.write(w, indentFactor, 0).toString();
}
}
/**
* Make a JSON text of an Object value. If the object has an
* value.toJSONString() method, then that method will be used to produce the
* JSON text. The method is required to produce a strictly conforming text.
* If the object does not contain a toJSONString method (which is the most
* common case), then a text will be produced by other means. If the value
* is an array or Collection, then a JSONArray will be made from it and its
* toJSONString method will be called. If the value is a MAP, then a
* JSONObject will be made from it and its toJSONString method will be
* called. Otherwise, the value's toString method will be called, and the
* result will be quoted.
*
* <p>
* Warning: This method assumes that the data structure is acyclical.
*
* @param value
* The value to be serialized.
* @return a printable, displayable, transmittable representation of the
* object, beginning with <code>{</code> <small>(left
* brace)</small> and ending with <code>}</code> <small>(right
* brace)</small>.
* @throws JSONException
* If the value is or contains an invalid number.
*/
public static String valueToString(Object value) throws JSONException {
// moves the implementation to JSONWriter as:
// 1. It makes more sense to be part of the writer class
// 2. For Android support this method is not available. By implementing it in the Writer
// Android users can use the writer with the built in Android JSONObject implementation.
return JSONWriter.valueToString(value);
}
/**
* Wrap an object, if necessary. If the object is <code>null</code>, return the NULL
* object. If it is an array or collection, wrap it in a JSONArray. If it is
* a map, wrap it in a JSONObject. If it is a standard property (Double,
* String, et al) then it is already wrapped. Otherwise, if it comes from
* one of the java packages, turn it into a string. And if it doesn't, try
* to wrap it in a JSONObject. If the wrapping fails, then null is returned.
*
* @param object
* The object to wrap
* @return The wrapped value
*/
public static Object wrap(Object object) {
return wrap(object, null);
}
private static Object wrap(Object object, Set<Object> objectsRecord) {
try {
if (NULL.equals(object)) {
return NULL;
}
if (object instanceof JSONObject || object instanceof JSONArray
|| NULL.equals(object) || object instanceof JSONString
|| object instanceof Byte || object instanceof Character
|| object instanceof Short || object instanceof Integer
|| object instanceof Long || object instanceof Boolean
|| object instanceof Float || object instanceof Double
|| object instanceof String || object instanceof BigInteger
|| object instanceof BigDecimal || object instanceof Enum) {
return object;
}
if (object instanceof Collection) {
Collection<?> coll = (Collection<?>) object;
return new JSONArray(coll);
}
if (object.getClass().isArray()) {
return new JSONArray(object);
}
if (object instanceof Map) {
Map<?, ?> map = (Map<?, ?>) object;
return new JSONObject(map);
}
Package objectPackage = object.getClass().getPackage();
String objectPackageName = objectPackage != null ? objectPackage
.getName() : "";
if (objectPackageName.startsWith("java.")
|| objectPackageName.startsWith("javax.")
|| object.getClass().getClassLoader() == null) {
return object.toString();
}
if (objectsRecord != null) {
return new JSONObject(object, objectsRecord);
}
return new JSONObject(object);
}
catch (JSONException exception) {
throw exception;
} catch (Exception exception) {
return null;
}
}
/**
* Write the contents of the JSONObject as JSON text to a writer. For
* compactness, no whitespace is added.
* <p><b>
* Warning: This method assumes that the data structure is acyclical.
* </b>
* @param writer the writer object
* @return The writer.
* @throws JSONException if a called function has an error
*/
public Writer write(Writer writer) throws JSONException {
return this.write(writer, 0, 0);
}
@SuppressWarnings("resource")
static final Writer writeValue(Writer writer, Object value,
int indentFactor, int indent) throws JSONException, IOException {
if (value == null || value.equals(null)) {
writer.write("null");
} else if (value instanceof JSONString) {
Object o;
try {
o = ((JSONString) value).toJSONString();
} catch (Exception e) {
throw new JSONException(e);
}
writer.write(o != null ? o.toString() : quote(value.toString()));
} else if (value instanceof Number) {
// not all Numbers may match actual JSON Numbers. i.e. fractions or Imaginary
final String numberAsString = numberToString((Number) value);
if(NUMBER_PATTERN.matcher(numberAsString).matches()) {
writer.write(numberAsString);
} else {
// The Number value is not a valid JSON number.
// Instead we will quote it as a string
quote(numberAsString, writer);
}
} else if (value instanceof Boolean) {
writer.write(value.toString());
} else if (value instanceof Enum<?>) {
writer.write(quote(((Enum<?>)value).name()));
} else if (value instanceof JSONObject) {
((JSONObject) value).write(writer, indentFactor, indent);
} else if (value instanceof JSONArray) {
((JSONArray) value).write(writer, indentFactor, indent);
} else if (value instanceof Map) {
Map<?, ?> map = (Map<?, ?>) value;
new JSONObject(map).write(writer, indentFactor, indent);
} else if (value instanceof Collection) {
Collection<?> coll = (Collection<?>) value;
new JSONArray(coll).write(writer, indentFactor, indent);
} else if (value.getClass().isArray()) {
new JSONArray(value).write(writer, indentFactor, indent);
} else {
quote(value.toString(), writer);
}
return writer;
}
static final void indent(Writer writer, int indent) throws IOException {
for (int i = 0; i < indent; i += 1) {
writer.write(' ');
}
}
/**
* Write the contents of the JSONObject as JSON text to a writer.
*
* <p>If <pre>{@code indentFactor > 0}</pre> and the {@link JSONObject}
* has only one key, then the object will be output on a single line:
* <pre>{@code {"key": 1}}</pre>
*
* <p>If an object has 2 or more keys, then it will be output across
* multiple lines: <pre>{@code {
* "key1": 1,
* "key2": "value 2",
* "key3": 3
* }}</pre>
* <p><b>
* Warning: This method assumes that the data structure is acyclical.
* </b>
*
* @param writer
* Writes the serialized JSON
* @param indentFactor
* The number of spaces to add to each level of indentation.
* @param indent
* The indentation of the top level.
* @return The writer.
* @throws JSONException if a called function has an error or a write error
* occurs
*/
@SuppressWarnings("resource")
public Writer write(Writer writer, int indentFactor, int indent)
throws JSONException {
try {
boolean needsComma = false;
final int length = this.length();
writer.write('{');
if (length == 1) {
final Entry<String,?> entry = this.entrySet().iterator().next();
final String key = entry.getKey();
writer.write(quote(key));
writer.write(':');
if (indentFactor > 0) {
writer.write(' ');
}
try{
writeValue(writer, entry.getValue(), indentFactor, indent);
} catch (Exception e) {
throw new JSONException("Unable to write JSONObject value for key: " + key, e);
}
} else if (length != 0) {
final int newIndent = indent + indentFactor;
for (final Entry<String,?> entry : this.entrySet()) {
if (needsComma) {
writer.write(',');
}
if (indentFactor > 0) {
writer.write('\n');
}
indent(writer, newIndent);
final String key = entry.getKey();
writer.write(quote(key));
writer.write(':');
if (indentFactor > 0) {
writer.write(' ');
}
try {
writeValue(writer, entry.getValue(), indentFactor, newIndent);
} catch (Exception e) {
throw new JSONException("Unable to write JSONObject value for key: " + key, e);
}
needsComma = true;
}
if (indentFactor > 0) {
writer.write('\n');
}
indent(writer, indent);
}
writer.write('}');
return writer;
} catch (IOException exception) {
throw new JSONException(exception);
}
}
/**
* Returns a java.util.Map containing all of the entries in this object.
* If an entry in the object is a JSONArray or JSONObject it will also
* be converted.
* <p>
* Warning: This method assumes that the data structure is acyclical.
*
* @return a java.util.Map containing the entries of this object
*/
public Map<String, Object> toMap() {
Map<String, Object> results = new HashMap<String, Object>();
for (Entry<String, Object> entry : this.entrySet()) {
Object value;
if (entry.getValue() == null || NULL.equals(entry.getValue())) {
value = null;
} else if (entry.getValue() instanceof JSONObject) {
value = ((JSONObject) entry.getValue()).toMap();
} else if (entry.getValue() instanceof JSONArray) {
value = ((JSONArray) entry.getValue()).toList();
} else {
value = entry.getValue();
}
results.put(entry.getKey(), value);
}
return results;
}
/**
* Create a new JSONException in a common format for incorrect conversions.
* @param key name of the key
* @param valueType the type of value being coerced to
* @param cause optional cause of the coercion failure
* @return JSONException that can be thrown.
*/
private static JSONException wrongValueFormatException(
String key,
String valueType,
Object value,
Throwable cause) {
if(value == null) {
return new JSONException(
"JSONObject[" + quote(key) + "] is not a " + valueType + " (null)."
, cause);
}
// don't try to toString collections or known object types that could be large.
if(value instanceof Map || value instanceof Iterable || value instanceof JSONObject) {
return new JSONException(
"JSONObject[" + quote(key) + "] is not a " + valueType + " (" + value.getClass() + ")."
, cause);
}
return new JSONException(
"JSONObject[" + quote(key) + "] is not a " + valueType + " (" + value.getClass() + " : " + value + ")."
, cause);
}
/**
* Create a new JSONException in a common format for recursive object definition.
* @param key name of the key
* @return JSONException that can be thrown.
*/
private static JSONException recursivelyDefinedObjectException(String key) {
return new JSONException(
"JavaBean object contains recursively defined member variable of key " + quote(key)
);
}
}