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General data-binding functionality for Jackson: works on core streaming API
package com.fasterxml.jackson.databind.util;
import java.util.*;
import com.fasterxml.jackson.databind.AnnotationIntrospector;
import com.fasterxml.jackson.databind.DeserializationConfig;
import com.fasterxml.jackson.databind.MapperFeature;
import com.fasterxml.jackson.databind.introspect.AnnotatedMember;
/**
* Helper class used to resolve String values (either JSON Object field
* names or regular String values) into Java Enum instances.
*/
public class EnumResolver implements java.io.Serializable
{
private static final long serialVersionUID = 1L;
protected final Class> _enumClass;
protected final Enum[] _enums;
protected final HashMap> _enumsById;
protected final Enum _defaultValue;
/**
* @since 2.12
*/
protected final boolean _isIgnoreCase;
/**
* @since 2.12
*/
protected EnumResolver(Class> enumClass, Enum[] enums,
HashMap> map, Enum defaultValue,
boolean isIgnoreCase)
{
_enumClass = enumClass;
_enums = enums;
_enumsById = map;
_defaultValue = defaultValue;
_isIgnoreCase = isIgnoreCase;
}
/**
* Factory method for constructing resolver that maps from Enum.name() into
* Enum value.
*
* @since 2.12
*/
public static EnumResolver constructFor(DeserializationConfig config,
Class enumCls) {
return _constructFor(enumCls, config.getAnnotationIntrospector(),
config.isEnabled(MapperFeature.ACCEPT_CASE_INSENSITIVE_ENUMS));
}
/**
* @since 2.12
*/
protected static EnumResolver _constructFor(Class enumCls0,
AnnotationIntrospector ai, boolean isIgnoreCase)
{
final Class> enumCls = _enumClass(enumCls0);
final Enum[] enumConstants = _enumConstants(enumCls0);
String[] names = ai.findEnumValues(enumCls, enumConstants, new String[enumConstants.length]);
final String[][] allAliases = new String[names.length][];
ai.findEnumAliases(enumCls, enumConstants, allAliases);
HashMap> map = new HashMap>();
for (int i = 0, len = enumConstants.length; i < len; ++i) {
final Enum enumValue = enumConstants[i];
String name = names[i];
if (name == null) {
name = enumValue.name();
}
map.put(name, enumValue);
String[] aliases = allAliases[i];
if (aliases != null) {
for (String alias : aliases) {
// TODO: JDK 1.8, use Map.putIfAbsent()
// Avoid overriding any primary names
if (!map.containsKey(alias)) {
map.put(alias, enumValue);
}
}
}
}
return new EnumResolver(enumCls, enumConstants, map,
_enumDefault(ai, enumCls), isIgnoreCase);
}
/**
* Factory method for constructing resolver that maps from Enum.toString() into
* Enum value
*
* @since 2.12
*/
public static EnumResolver constructUsingToString(DeserializationConfig config,
Class enumCls) {
return _constructUsingToString(enumCls, config.getAnnotationIntrospector(),
config.isEnabled(MapperFeature.ACCEPT_CASE_INSENSITIVE_ENUMS));
}
/**
* @since 2.12
*/
protected static EnumResolver _constructUsingToString(Class enumCls0,
AnnotationIntrospector ai, boolean isIgnoreCase)
{
final Class> enumCls = _enumClass(enumCls0);
final Enum[] enumConstants = _enumConstants(enumCls0);
HashMap> map = new HashMap>();
final String[][] allAliases = new String[enumConstants.length][];
ai.findEnumAliases(enumCls, enumConstants, allAliases);
// from last to first, so that in case of duplicate values, first wins
for (int i = enumConstants.length; --i >= 0; ) {
Enum enumValue = enumConstants[i];
map.put(enumValue.toString(), enumValue);
String[] aliases = allAliases[i];
if (aliases != null) {
for (String alias : aliases) {
// TODO: JDK 1.8, use Map.putIfAbsent()
// Avoid overriding any primary names
if (!map.containsKey(alias)) {
map.put(alias, enumValue);
}
}
}
}
return new EnumResolver(enumCls, enumConstants, map,
_enumDefault(ai, enumCls), isIgnoreCase);
}
/**
* Method used when actual String serialization is indicated using @JsonValue
* on a method in Enum class.
*
* @since 2.12
*/
public static EnumResolver constructUsingMethod(DeserializationConfig config,
Class enumCls, AnnotatedMember accessor) {
return _constructUsingMethod(enumCls, accessor, config.getAnnotationIntrospector(),
config.isEnabled(MapperFeature.ACCEPT_CASE_INSENSITIVE_ENUMS));
}
/**
* @since 2.12
*/
protected static EnumResolver _constructUsingMethod(Class enumCls0,
AnnotatedMember accessor, AnnotationIntrospector ai, boolean isIgnoreCase)
{
final Class> enumCls = _enumClass(enumCls0);
final Enum[] enumConstants = _enumConstants(enumCls0);
HashMap> map = new HashMap>();
// from last to first, so that in case of duplicate values, first wins
for (int i = enumConstants.length; --i >= 0; ) {
Enum en = enumConstants[i];
try {
Object o = accessor.getValue(en);
if (o != null) {
map.put(o.toString(), en);
}
} catch (Exception e) {
throw new IllegalArgumentException("Failed to access @JsonValue of Enum value "+en+": "+e.getMessage());
}
}
return new EnumResolver(enumCls, enumConstants, map,
_enumDefault(ai, enumCls), isIgnoreCase);
}
public CompactStringObjectMap constructLookup() {
return CompactStringObjectMap.construct(_enumsById);
}
@SuppressWarnings("unchecked")
protected static Class> _enumClass(Class enumCls0) {
return (Class>) enumCls0;
}
protected static Enum[] _enumConstants(Class enumCls) {
final Enum[] enumValues = _enumClass(enumCls).getEnumConstants();
if (enumValues == null) {
throw new IllegalArgumentException("No enum constants for class "+enumCls.getName());
}
return enumValues;
}
protected static Enum _enumDefault(AnnotationIntrospector intr, Class enumCls) {
return (intr != null) ? intr.findDefaultEnumValue(_enumClass(enumCls)) : null;
}
/*
/**********************************************************************
/* Deprecated constructors, factory methods
/**********************************************************************
*/
/**
* @deprecated Since 2.12 (remove from 2.13+ not part of public API)
*/
@Deprecated // since 2.12
protected EnumResolver(Class> enumClass, Enum[] enums,
HashMap> map, Enum defaultValue) {
this(enumClass, enums, map, defaultValue, false);
}
/**
* @deprecated Since 2.12
*/
@Deprecated // since 2.12
public static EnumResolver constructFor(Class> enumCls, AnnotationIntrospector ai) {
return _constructFor(enumCls, ai, false);
}
/**
* @deprecated Since 2.12
*/
@Deprecated // since 2.12
public static EnumResolver constructUnsafe(Class rawEnumCls, AnnotationIntrospector ai) {
return _constructFor(rawEnumCls, ai, false);
}
/**
* @deprecated Since 2.12
*/
@Deprecated // since 2.12
public static EnumResolver constructUsingToString(Class> enumCls,
AnnotationIntrospector ai) {
return _constructUsingToString(enumCls, ai, false);
}
/**
* @since 2.8
* @deprecated Since 2.12
*/
@Deprecated // since 2.12
public static EnumResolver constructUnsafeUsingToString(Class rawEnumCls,
AnnotationIntrospector ai) {
return _constructUsingToString(rawEnumCls, ai, false);
}
/**
* @deprecated Since 2.8 (remove from 2.13 or later)
*/
@Deprecated
public static EnumResolver constructUsingToString(Class> enumCls) {
return _constructUsingToString(enumCls, null, false);
}
/**
* @deprecated Since 2.12
*/
@Deprecated
public static EnumResolver constructUsingMethod(Class> enumCls,
AnnotatedMember accessor, AnnotationIntrospector ai) {
return _constructUsingMethod(enumCls, accessor, ai, false);
}
/**
* @since 2.9
* @deprecated Since 2.12
*/
@Deprecated
public static EnumResolver constructUnsafeUsingMethod(Class rawEnumCls,
AnnotatedMember accessor, AnnotationIntrospector ai) {
return _constructUsingMethod(rawEnumCls, accessor, ai, false);
}
/*
/**********************************************************************
/* Public API
/**********************************************************************
*/
public Enum findEnum(final String key) {
Enum en = _enumsById.get(key);
if (en == null) {
if (_isIgnoreCase) {
return _findEnumCaseInsensitive(key);
}
}
return en;
}
// @since 2.12
protected Enum _findEnumCaseInsensitive(final String key) {
for (Map.Entry> entry : _enumsById.entrySet()) {
if (key.equalsIgnoreCase(entry.getKey())) {
return entry.getValue();
}
}
return null;
}
public Enum getEnum(int index) {
if (index < 0 || index >= _enums.length) {
return null;
}
return _enums[index];
}
public Enum getDefaultValue(){
return _defaultValue;
}
public Enum[] getRawEnums() {
return _enums;
}
public List> getEnums() {
ArrayList> enums = new ArrayList>(_enums.length);
for (Enum e : _enums) {
enums.add(e);
}
return enums;
}
/**
* @since 2.7.3
*/
public Collection getEnumIds() {
return _enumsById.keySet();
}
public Class> getEnumClass() { return _enumClass; }
public int lastValidIndex() { return _enums.length-1; }
}
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