JsonNodeFactory.java
package com.fasterxml.jackson.databind.node;
import java.math.BigDecimal;
import java.math.BigInteger;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.util.RawValue;
/**
* Base class that specifies methods for getting access to
* Node instances (newly constructed, or shared, depending
* on type), as well as basic implementation of the methods.
* Designed to be sub-classed if extended functionality (additions
* to behavior of node types, mostly) is needed.
*<p>
* One configuration option in the default implementation is that
* of whether
* {@link DecimalNode} instances must be built with exact representations of
* {@link BigDecimal} instances; or to use "normalized" instance.
* This has quite an influence since, for instance, a {@link BigDecimal} (and,
* therefore, a {@code DecimalNode}) constructed from input string {@code "1.0"} and
* another constructed with input string {@code "1.00"} <b>will not</b> be
* equal unless normalized since their scale differs (1 in the first case,
* 2 in the second case).
* Normalization, if enabled, means simply calling {@link BigDecimal#stripTrailingZeros()}.
*<p>
* Note that configuration of "normalization" changed in 2.15:
* while {@code JsonNodeFactory} still has a default setting,
* the intent is to deprecate and remove this, to be replaced by
* new {@link com.fasterxml.jackson.databind.cfg.JsonNodeFeature#STRIP_TRAILING_BIGDECIMAL_ZEROES}
* setting.
* Default setting in 2.15 is to ENABLE normalization: this will likely
* change at latest in Jackson 3.0 (to leave {@code BigDecimal} values as
* they are).
* Note, too, that this factory will no longer handle this normalization
* (if enabled): caller (like {@link com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer})
* is expected to handle it.
*/
public class JsonNodeFactory
implements java.io.Serializable, // since 2.1
JsonNodeCreator // since 2.3
{
// with 2.2
private static final long serialVersionUID = 1L;
/**
* Constant that defines maximum {@code JsonPointer} element index we
* use for inserts.
*/
protected final static int MAX_ELEMENT_INDEX_FOR_INSERT = 9999;
@Deprecated // as of 2.15
private final boolean _cfgBigDecimalExact;
/**
* Default singleton instance that construct "standard" node instances:
* given that this class is stateless, a globally shared singleton
* can be used.
*/
public final static JsonNodeFactory instance = new JsonNodeFactory();
/**
* @param bigDecimalExact see Class description on "BigDecimal normalization"
*
* @see BigDecimal
*/
public JsonNodeFactory(boolean bigDecimalExact)
{
_cfgBigDecimalExact = bigDecimalExact;
}
/**
* Default constructor.
* <p>This calls {@link #JsonNodeFactory(boolean)} with {@code false}
* as an argument.</p>
*/
protected JsonNodeFactory()
{
this(false);
}
/**
* Return a factory instance with the desired behavior for BigDecimals
* <p>See {@link #JsonNodeFactory(boolean)} for a full description.</p>
*
* @param bigDecimalExact If {code true} DISABLE normalization of {@link BigDecimal} values;
* if {code false} ENABLE normalization
* @return a factory instance with specified configuration
*
* @deprecated Use {@link com.fasterxml.jackson.databind.cfg.JsonNodeFeature#STRIP_TRAILING_BIGDECIMAL_ZEROES}
* instead for configuring behavior.
*/
@Deprecated
public static JsonNodeFactory withExactBigDecimals(boolean bigDecimalExact)
{
return new JsonNodeFactory(bigDecimalExact);
}
/*
/**********************************************************
/* Metadata/config access
/**********************************************************
*/
/**
* @since 2.14
*/
public int getMaxElementIndexForInsert() {
return MAX_ELEMENT_INDEX_FOR_INSERT;
}
/**
* Accessor needed by {@code JsonNodeDeserializer}.
*
* @since 2.15
*/
public boolean willStripTrailingBigDecimalZeroes() {
return !_cfgBigDecimalExact;
}
/*
/**********************************************************
/* Factory methods for literal values
/**********************************************************
*/
/**
* Factory method for getting an instance of JSON boolean value
* (either literal 'true' or 'false')
*/
@Override
public BooleanNode booleanNode(boolean v) {
return v ? BooleanNode.getTrue() : BooleanNode.getFalse();
}
/**
* Factory method for getting an instance of JSON null node (which
* represents literal null value)
*/
@Override
public NullNode nullNode() { return NullNode.getInstance(); }
public JsonNode missingNode() {
return MissingNode.getInstance();
}
/*
/**********************************************************
/* Factory methods for numeric values
/**********************************************************
*/
/**
* Factory method for getting an instance of JSON numeric value
* that expresses given 8-bit value
*/
@Override
public NumericNode numberNode(byte v) { return IntNode.valueOf(v); }
/**
* Alternate factory method that will handle wrapper value, which may
* be null.
* Due to possibility of null, returning type is not guaranteed to be
* {@link NumericNode}, but just {@link ValueNode}.
*/
@Override
public ValueNode numberNode(Byte value) {
return (value == null) ? nullNode() : IntNode.valueOf(value.intValue());
}
/**
* Factory method for getting an instance of JSON numeric value
* that expresses given 16-bit integer value
*/
@Override
public NumericNode numberNode(short v) { return ShortNode.valueOf(v); }
/**
* Alternate factory method that will handle wrapper value, which may
* be null.
* Due to possibility of null, returning type is not guaranteed to be
* {@link NumericNode}, but just {@link ValueNode}.
*/
@Override
public ValueNode numberNode(Short value) {
return (value == null) ? nullNode() : ShortNode.valueOf(value);
}
/**
* Factory method for getting an instance of JSON numeric value
* that expresses given 32-bit integer value
*/
@Override
public NumericNode numberNode(int v) { return IntNode.valueOf(v); }
/**
* Alternate factory method that will handle wrapper value, which may
* be null.
* Due to possibility of null, returning type is not guaranteed to be
* {@link NumericNode}, but just {@link ValueNode}.
*/
@Override
public ValueNode numberNode(Integer value) {
return (value == null) ? nullNode() : IntNode.valueOf(value.intValue());
}
/**
* Factory method for getting an instance of JSON numeric value
* that expresses given 64-bit integer value
*/
@Override
public NumericNode numberNode(long v) {
return LongNode.valueOf(v);
}
/**
* Alternate factory method that will handle wrapper value, which may be null.
* Due to possibility of null, returning type is not guaranteed to be
* {@link NumericNode}, but just {@link ValueNode}.
*/
@Override
public ValueNode numberNode(Long v) {
if (v == null) {
return nullNode();
}
return LongNode.valueOf(v.longValue());
}
/**
* Factory method for getting an instance of JSON numeric value
* that expresses given unlimited range integer value
*/
@Override
public ValueNode numberNode(BigInteger v) {
if (v == null) {
return nullNode();
}
return BigIntegerNode.valueOf(v);
}
/**
* Factory method for getting an instance of JSON numeric value
* that expresses given 32-bit floating point value
*/
@Override
public NumericNode numberNode(float v) { return FloatNode.valueOf((float) v); }
/**
* Alternate factory method that will handle wrapper value, which may
* be null.
* Due to possibility of null, returning type is not guaranteed to be
* {@link NumericNode}, but just {@link ValueNode}.
*/
@Override
public ValueNode numberNode(Float value) {
return (value == null) ? nullNode() : FloatNode.valueOf(value.floatValue());
}
/**
* Factory method for getting an instance of JSON numeric value
* that expresses given 64-bit floating point value
*/
@Override
public NumericNode numberNode(double v) { return DoubleNode.valueOf(v); }
/**
* Alternate factory method that will handle wrapper value, which may
* be null.
* Due to possibility of null, returning type is not guaranteed to be
* {@link NumericNode}, but just {@link ValueNode}.
*/
@Override
public ValueNode numberNode(Double value) {
return (value == null) ? nullNode() : DoubleNode.valueOf(value.doubleValue());
}
/**
* Factory method for getting an instance of JSON numeric value
* that expresses given unlimited precision floating point value
* <p>
* Note that regardless whether the factory has been built to normalize decimal
* values (see class JavaDoc), the {@link BigDecimal} argument will NOT be
* modified by this method -- caller will need to handle normalization, if any.
*
* @see #JsonNodeFactory(boolean)
*/
@Override
public ValueNode numberNode(BigDecimal v)
{
if (v == null) {
return nullNode();
}
// 23-Jan-2023, tatu: As per [databind#3651] it's now up to caller
// to do normalization, if any; we will construct node with given value
return DecimalNode.valueOf(v);
}
/*
/**********************************************************
/* Factory methods for textual values
/**********************************************************
*/
/**
* Factory method for constructing a node that represents JSON
* String value
*/
@Override
public TextNode textNode(String text) { return TextNode.valueOf(text); }
/**
* Factory method for constructing a node that represents given
* binary data, and will get serialized as equivalent base64-encoded
* String value
*/
@Override
public BinaryNode binaryNode(byte[] data) { return BinaryNode.valueOf(data); }
/**
* Factory method for constructing a node that represents given
* binary data, and will get serialized as equivalent base64-encoded
* String value
*/
@Override
public BinaryNode binaryNode(byte[] data, int offset, int length) {
return BinaryNode.valueOf(data, offset, length);
}
/*
/**********************************************************
/* Factory method for structured values
/**********************************************************
*/
/**
* Factory method for constructing an empty JSON Array node
*/
@Override
public ArrayNode arrayNode() { return new ArrayNode(this); }
/**
* Factory method for constructing a JSON Array node with an initial capacity
*
* @since 2.8
*/
@Override
public ArrayNode arrayNode(int capacity) { return new ArrayNode(this, capacity); }
/**
* Factory method for constructing an empty JSON Object ("struct") node
*/
@Override
public ObjectNode objectNode() { return new ObjectNode(this); }
/**
* Factory method for constructing a wrapper for POJO
* ("Plain Old Java Object") objects; these will get serialized
* using data binding, usually as JSON Objects, but in some
* cases as JSON Strings or other node types.
*/
@Override
public ValueNode pojoNode(Object pojo) { return new POJONode(pojo); }
@Override
public ValueNode rawValueNode(RawValue value) {
return new POJONode(value);
}
/*
/**********************************************************
/* Helper methods
/**********************************************************
*/
protected boolean _inIntRange(long l)
{
int i = (int) l;
long l2 = (long) i;
return (l2 == l);
}
}