DefaultAccessorNamingStrategy.java
package com.fasterxml.jackson.databind.introspect;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import com.fasterxml.jackson.databind.AnnotationIntrospector;
import com.fasterxml.jackson.databind.BeanDescription;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.MapperFeature;
import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder;
import com.fasterxml.jackson.databind.cfg.MapperConfig;
import com.fasterxml.jackson.databind.jdk14.JDK14Util;
/**
* Default {@link AccessorNamingStrategy} used by Jackson: to be used either as-is,
* or as base-class with overrides.
*
* @since 2.12
*/
public class DefaultAccessorNamingStrategy
extends AccessorNamingStrategy
{
/**
* Definition of a handler API to use for checking whether given base name
* (remainder of accessor method name after removing prefix) is acceptable
* based on various rules.
*
* @since 2.12
*/
public interface BaseNameValidator {
public boolean accept(char firstChar, String basename, int offset);
}
protected final MapperConfig<?> _config;
protected final AnnotatedClass _forClass;
/**
* Optional validator for checking that base name
*/
protected final BaseNameValidator _baseNameValidator;
protected final boolean _stdBeanNaming;
protected final boolean _isGettersNonBoolean;
protected final String _getterPrefix;
/**
* @since 2.14
*/
protected final String _isGetterPrefix;
/**
* Prefix used by auto-detected mutators ("setters"): usually "set",
* but differs for builder objects ("with" by default).
*/
protected final String _mutatorPrefix;
protected DefaultAccessorNamingStrategy(MapperConfig<?> config, AnnotatedClass forClass,
String mutatorPrefix, String getterPrefix, String isGetterPrefix,
BaseNameValidator baseNameValidator)
{
_config = config;
_forClass = forClass;
_stdBeanNaming = config.isEnabled(MapperFeature.USE_STD_BEAN_NAMING);
_isGettersNonBoolean = config.isEnabled(MapperFeature.ALLOW_IS_GETTERS_FOR_NON_BOOLEAN);
_mutatorPrefix = mutatorPrefix;
_getterPrefix = getterPrefix;
_isGetterPrefix = isGetterPrefix;
_baseNameValidator = baseNameValidator;
}
@Override
public String findNameForIsGetter(AnnotatedMethod am, String name)
{
if (_isGetterPrefix != null) {
if (_isGettersNonBoolean || _booleanType(am.getType())) {
if (name.startsWith(_isGetterPrefix)) {
return _stdBeanNaming
? stdManglePropertyName(name, _isGetterPrefix.length())
: legacyManglePropertyName(name, _isGetterPrefix.length());
}
}
}
return null;
}
// @since 2.15
private boolean _booleanType(JavaType type) {
// but then, as per [databind#3836] Reference types too
if (type.isReferenceType()) {
type = type.getReferencedType();
}
// First, well-known JDK boolean types
if (type.hasRawClass(Boolean.TYPE)
|| type.hasRawClass(Boolean.class)
|| type.hasRawClass(AtomicBoolean.class)) {
return true;
}
return false;
}
@Override
public String findNameForRegularGetter(AnnotatedMethod am, String name)
{
if ((_getterPrefix != null) && name.startsWith(_getterPrefix)) {
// 16-Feb-2009, tatu: To handle [JACKSON-53], need to block CGLib-provided
// method "getCallbacks". Not sure of exact safe criteria to get decent
// coverage without false matches; but for now let's assume there is
// no reason to use any such getter from CGLib.
if ("getCallbacks".equals(name)) {
if (_isCglibGetCallbacks(am)) {
return null;
}
} else if ("getMetaClass".equals(name)) {
// 30-Apr-2009, tatu: Need to suppress serialization of a cyclic reference
if (_isGroovyMetaClassGetter(am)) {
return null;
}
}
return _stdBeanNaming
? stdManglePropertyName(name, _getterPrefix.length())
: legacyManglePropertyName(name, _getterPrefix.length());
}
return null;
}
@Override
public String findNameForMutator(AnnotatedMethod am, String name)
{
if ((_mutatorPrefix != null) && name.startsWith(_mutatorPrefix)) {
return _stdBeanNaming
? stdManglePropertyName(name, _mutatorPrefix.length())
: legacyManglePropertyName(name, _mutatorPrefix.length());
}
return null;
}
// Default implementation simply returns name as-is
@Override
public String modifyFieldName(AnnotatedField field, String name) {
return name;
}
/*
/**********************************************************************
/* Name-mangling methods copied in 2.12 from "BeanUtil"
/**********************************************************************
*/
/**
* Method called to figure out name of the property, given
* corresponding suggested name based on a method or field name.
*
* @param basename Name of accessor/mutator method, not including prefix
* ("get"/"is"/"set")
*/
protected String legacyManglePropertyName(final String basename, final int offset)
{
final int end = basename.length();
if (end == offset) { // empty name, nope
return null;
}
char c = basename.charAt(offset);
// 12-Oct-2020, tatu: Additional configurability; allow checking that
// base name is acceptable (currently just by checking first character)
if (_baseNameValidator != null) {
if (!_baseNameValidator.accept(c, basename, offset)) {
return null;
}
}
// next check: is the first character upper case? If not, return as is
char d = Character.toLowerCase(c);
if (c == d) {
return basename.substring(offset);
}
// otherwise, lower case initial chars. Common case first, just one char
StringBuilder sb = new StringBuilder(end - offset);
sb.append(d);
int i = offset+1;
for (; i < end; ++i) {
c = basename.charAt(i);
d = Character.toLowerCase(c);
if (c == d) {
sb.append(basename, i, end);
break;
}
sb.append(d);
}
return sb.toString();
}
protected String stdManglePropertyName(final String basename, final int offset)
{
final int end = basename.length();
if (end == offset) { // empty name, nope
return null;
}
// first: if it doesn't start with capital, return as-is
char c0 = basename.charAt(offset);
// 12-Oct-2020, tatu: Additional configurability; allow checking that
// base name is acceptable (currently just by checking first character)
if (_baseNameValidator != null) {
if (!_baseNameValidator.accept(c0, basename, offset)) {
return null;
}
}
char c1 = Character.toLowerCase(c0);
if (c0 == c1) {
return basename.substring(offset);
}
// 17-Dec-2014, tatu: As per [databind#653], need to follow more
// closely Java Beans spec; specifically, if two first are upper-case,
// then no lower-casing should be done.
if ((offset + 1) < end) {
if (Character.isUpperCase(basename.charAt(offset+1))) {
return basename.substring(offset);
}
}
StringBuilder sb = new StringBuilder(end - offset);
sb.append(c1);
sb.append(basename, offset+1, end);
return sb.toString();
}
/*
/**********************************************************************
/* Legacy methods moved in 2.12 from "BeanUtil" -- are these still needed?
/**********************************************************************
*/
// This method was added to address the need to weed out CGLib-injected
// "getCallbacks" method.
// At this point caller has detected a potential getter method with
// name "getCallbacks" and we need to determine if it is indeed injected
// by Cglib. We do this by verifying that the result type is "net.sf.cglib.proxy.Callback[]"
protected boolean _isCglibGetCallbacks(AnnotatedMethod am)
{
Class<?> rt = am.getRawType();
// Ok, first: must return an array type
if (rt.isArray()) {
// And that type needs to be "net.sf.cglib.proxy.Callback".
// Theoretically could just be a type that implements it, but
// for now let's keep things simple, fix if need be.
Class<?> compType = rt.getComponentType();
// Actually, let's just verify it's a "net.sf.cglib.*" class/interface
final String className = compType.getName();
if (className.contains(".cglib")) {
return className.startsWith("net.sf.cglib")
// also, as per [JACKSON-177]
|| className.startsWith("org.hibernate.repackage.cglib")
// and [core#674]
|| className.startsWith("org.springframework.cglib");
}
}
return false;
}
// Another helper method to deal with Groovy's problematic metadata accessors
protected boolean _isGroovyMetaClassGetter(AnnotatedMethod am) {
return am.getRawType().getName().startsWith("groovy.lang");
}
/*
/**********************************************************************
/* Standard Provider implementation
/**********************************************************************
*/
/**
* Provider for {@link DefaultAccessorNamingStrategy}.
*<p>
* Default instance will use following default prefixes:
*<ul>
* <li>Setter for regular POJOs: "set"
* </li>
* <li>Builder-mutator: "with"
* </li>
* <li>Regular getter: "get"
* </li>
* <li>Is-getter (for Boolean values): "is"
* </li>
*</ul>
* and no additional restrictions on base names accepted (configurable for
* limits using {@link BaseNameValidator}), allowing names like
* "get_value()" and "getvalue()".
*/
public static class Provider
extends AccessorNamingStrategy.Provider
implements java.io.Serializable
{
private static final long serialVersionUID = 1L;
protected final String _setterPrefix;
protected final String _withPrefix;
protected final String _getterPrefix;
protected final String _isGetterPrefix;
protected final BaseNameValidator _baseNameValidator;
public Provider() {
this("set", JsonPOJOBuilder.DEFAULT_WITH_PREFIX,
"get", "is", null);
}
protected Provider(Provider p,
String setterPrefix, String withPrefix,
String getterPrefix, String isGetterPrefix)
{
this(setterPrefix, withPrefix, getterPrefix, isGetterPrefix,
p._baseNameValidator);
}
protected Provider(Provider p, BaseNameValidator vld)
{
this(p._setterPrefix, p._withPrefix,
p._getterPrefix, p._isGetterPrefix, vld);
}
protected Provider(String setterPrefix, String withPrefix,
String getterPrefix, String isGetterPrefix,
BaseNameValidator vld)
{
_setterPrefix = setterPrefix;
_withPrefix = withPrefix;
_getterPrefix = getterPrefix;
_isGetterPrefix = isGetterPrefix;
_baseNameValidator = vld;
}
/**
* Mutant factory for changing the prefix used for "setter"
* methods
*
* @param prefix Prefix to use; or empty String {@code ""} to not use
* any prefix (meaning signature-compatible method name is used as
* the property basename (and subject to name mangling)),
* or {@code null} to prevent name-based detection.
*
* @return Provider instance with specified setter-prefix
*/
public Provider withSetterPrefix(String prefix) {
return new Provider(this,
prefix, _withPrefix, _getterPrefix, _isGetterPrefix);
}
/**
* Mutant factory for changing the prefix used for Builders
* (from default {@link JsonPOJOBuilder#DEFAULT_WITH_PREFIX})
*
* @param prefix Prefix to use; or empty String {@code ""} to not use
* any prefix (meaning signature-compatible method name is used as
* the property basename (and subject to name mangling)),
* or {@code null} to prevent name-based detection.
*
* @return Provider instance with specified with-prefix
*/
public Provider withBuilderPrefix(String prefix) {
return new Provider(this,
_setterPrefix, prefix, _getterPrefix, _isGetterPrefix);
}
/**
* Mutant factory for changing the prefix used for "getter"
* methods
*
* @param prefix Prefix to use; or empty String {@code ""} to not use
* any prefix (meaning signature-compatible method name is used as
* the property basename (and subject to name mangling)),
* or {@code null} to prevent name-based detection.
*
* @return Provider instance with specified getter-prefix
*/
public Provider withGetterPrefix(String prefix) {
return new Provider(this,
_setterPrefix, _withPrefix, prefix, _isGetterPrefix);
}
/**
* Mutant factory for changing the prefix used for "is-getter"
* methods (getters that return boolean/Boolean value).
*
* @param prefix Prefix to use; or empty String {@code ""} to not use
* any prefix (meaning signature-compatible method name is used as
* the property basename (and subject to name mangling)).
* or {@code null} to prevent name-based detection.
*
* @return Provider instance with specified is-getter-prefix
*/
public Provider withIsGetterPrefix(String prefix) {
return new Provider(this,
_setterPrefix, _withPrefix, _getterPrefix, prefix);
}
/**
* Mutant factory for changing the rules regarding which characters
* are allowed as the first character of property base name, after
* checking and removing prefix.
*<p>
* For example, consider "getter" method candidate (no arguments, has return
* type) named {@code getValue()} is considered, with "getter-prefix"
* defined as {@code get}, then base name is {@code Value} and the
* first character to consider is {@code V}. Upper-case letters are
* always accepted so this is fine.
* But with similar settings, method {@code get_value()} would only be
* recognized as getter if {@code allowNonLetterFirstChar} is set to
* {@code true}: otherwise it will not be considered a getter-method.
* Similarly "is-getter" candidate method with name {@code island()}
* would only be considered if {@code allowLowerCaseFirstChar} is set
* to {@code true}.
*
* @param allowLowerCaseFirstChar Whether base names that start with lower-case
* letter (like {@code "a"} or {@code "b"}) are accepted as valid or not:
* consider difference between "setter-methods" {@code setValue()} and {@code setvalue()}.
* @param allowNonLetterFirstChar Whether base names that start with non-letter
* character (like {@code "_"} or number {@code 1}) are accepted as valid or not:
* consider difference between "setter-methods" {@code setValue()} and {@code set_value()}.
*
* @return Provider instance with specified validity rules
*/
public Provider withFirstCharAcceptance(boolean allowLowerCaseFirstChar,
boolean allowNonLetterFirstChar) {
return withBaseNameValidator(
FirstCharBasedValidator.forFirstNameRule(allowLowerCaseFirstChar, allowNonLetterFirstChar));
}
/**
* Mutant factory for specifying validator that is used to further verify that
* base name derived from accessor name is acceptable: this can be used to add
* further restrictions such as limit that the first character of the base name
* is an upper-case letter.
*
* @param vld Validator to use, if any; {@code null} to indicate no additional rules
*
* @return Provider instance with specified base name validator to use, if any
*/
public Provider withBaseNameValidator(BaseNameValidator vld) {
return new Provider(this, vld);
}
@Override
public AccessorNamingStrategy forPOJO(MapperConfig<?> config, AnnotatedClass targetClass)
{
return new DefaultAccessorNamingStrategy(config, targetClass,
_setterPrefix, _getterPrefix, _isGetterPrefix,
_baseNameValidator);
}
@Override
public AccessorNamingStrategy forBuilder(MapperConfig<?> config,
AnnotatedClass builderClass, BeanDescription valueTypeDesc)
{
AnnotationIntrospector ai = config.isAnnotationProcessingEnabled() ? config.getAnnotationIntrospector() : null;
JsonPOJOBuilder.Value builderConfig = (ai == null) ? null : ai.findPOJOBuilderConfig(builderClass);
String mutatorPrefix = (builderConfig == null) ? _withPrefix : builderConfig.withPrefix;
return new DefaultAccessorNamingStrategy(config, builderClass,
mutatorPrefix, _getterPrefix, _isGetterPrefix,
_baseNameValidator);
}
@Override
public AccessorNamingStrategy forRecord(MapperConfig<?> config, AnnotatedClass recordClass)
{
return new RecordNaming(config, recordClass);
}
}
/**
* Simple implementation of {@link BaseNameValidator} that checks the
* first character and nothing else.
*<p>
* Instances are to be constructed using method
* {@link FirstCharBasedValidator#forFirstNameRule}.
*/
public static class FirstCharBasedValidator
implements BaseNameValidator
{
private final boolean _allowLowerCaseFirstChar;
private final boolean _allowNonLetterFirstChar;
protected FirstCharBasedValidator(boolean allowLowerCaseFirstChar,
boolean allowNonLetterFirstChar) {
_allowLowerCaseFirstChar = allowLowerCaseFirstChar;
_allowNonLetterFirstChar = allowNonLetterFirstChar;
}
/**
* Factory method to use for getting an instance with specified first-character
* restrictions, if any; or {@code null} if no checking is needed.
*
* @param allowLowerCaseFirstChar Whether base names that start with lower-case
* letter (like {@code "a"} or {@code "b"}) are accepted as valid or not:
* consider difference between "setter-methods" {@code setValue()} and {@code setvalue()}.
* @param allowNonLetterFirstChar Whether base names that start with non-letter
* character (like {@code "_"} or number {@code 1}) are accepted as valid or not:
* consider difference between "setter-methods" {@code setValue()} and {@code set_value()}.
*
* @return Validator instance to use, if any; {@code null} to indicate no additional
* rules applied (case when both arguments are {@code false})
*/
public static BaseNameValidator forFirstNameRule(boolean allowLowerCaseFirstChar,
boolean allowNonLetterFirstChar) {
if (!allowLowerCaseFirstChar && !allowNonLetterFirstChar) {
return null;
}
return new FirstCharBasedValidator(allowLowerCaseFirstChar,
allowNonLetterFirstChar);
}
@Override
public boolean accept(char firstChar, String basename, int offset) {
// Ok, so... If UTF-16 letter, then check whether lc allowed
// (title-case and upper-case both assumed to be acceptable by default)
if (Character.isLetter(firstChar)) {
return _allowLowerCaseFirstChar || !Character.isLowerCase(firstChar);
}
// Otherwise, non-letter checking applied
return _allowNonLetterFirstChar;
}
}
/**
* Implementation used for supporting "non-prefix" naming convention of
* Java 14 {@code java.lang.Record} types, and in particular find default
* accessors for declared record fields.
*<p>
* Current / initial implementation will also recognize additional "normal"
* getters ("get"-prefix) and is-getters ("is"-prefix and boolean return value)
* by name.
*/
public static class RecordNaming
extends DefaultAccessorNamingStrategy
{
/**
* Names of actual Record fields from definition; auto-detected.
*/
protected final Set<String> _fieldNames;
public RecordNaming(MapperConfig<?> config, AnnotatedClass forClass) {
super(config, forClass,
// no setters for (immutable) Records:
null,
// trickier: regular fields are ok (handled differently), but should
// we also allow getter discovery? For now let's do so
"get", "is", null);
String[] recordFieldNames = JDK14Util.getRecordFieldNames(forClass.getRawType());
// 01-May-2022, tatu: Due to [databind#3417] may return null when no info available
_fieldNames = recordFieldNames == null ?
Collections.emptySet() :
new HashSet<>(Arrays.asList(recordFieldNames));
}
@Override
public String findNameForRegularGetter(AnnotatedMethod am, String name)
{
// By default, field names are un-prefixed, but verify so that we will not
// include "toString()" or additional custom methods (unless latter are
// annotated for inclusion)
if (_fieldNames.contains(name)) {
return name;
}
// but also allow auto-detecting additional getters, if any?
return super.findNameForRegularGetter(am, name);
}
}
}