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package com.fasterxml.jackson.databind.util;
import java.util.*;
import com.fasterxml.jackson.databind.AnnotationIntrospector;
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;
protected EnumResolver(Class> enumClass, Enum[] enums, HashMap> map, Enum defaultValue)
{
_enumClass = enumClass;
_enums = enums;
_enumsById = map;
_defaultValue = defaultValue;
}
/**
* Factory method for constructing resolver that maps from Enum.name() into
* Enum value
*/
public static EnumResolver constructFor(Class> enumCls, AnnotationIntrospector ai)
{
Enum[] enumValues = enumCls.getEnumConstants();
if (enumValues == null) {
throw new IllegalArgumentException("No enum constants for class "+enumCls.getName());
}
String[] names = ai.findEnumValues(enumCls, enumValues, new String[enumValues.length]);
HashMap> map = new HashMap>();
for (int i = 0, len = enumValues.length; i < len; ++i) {
String name = names[i];
if (name == null) {
name = enumValues[i].name();
}
map.put(name, enumValues[i]);
}
Enum defaultEnum = ai.findDefaultEnumValue(enumCls);
return new EnumResolver(enumCls, enumValues, map, defaultEnum);
}
/**
* @deprecated Since 2.8, use {@link #constructUsingToString(Class, AnnotationIntrospector)} instead
*/
@Deprecated
public static EnumResolver constructUsingToString(Class> enumCls) {
return constructUsingToString(enumCls, null);
}
/**
* Factory method for constructing resolver that maps from Enum.toString() into
* Enum value
*
* @since 2.8
*/
public static EnumResolver constructUsingToString(Class> enumCls,
AnnotationIntrospector ai)
{
Enum[] enumValues = enumCls.getEnumConstants();
HashMap> map = new HashMap>();
// from last to first, so that in case of duplicate values, first wins
for (int i = enumValues.length; --i >= 0; ) {
Enum e = enumValues[i];
map.put(e.toString(), e);
}
Enum defaultEnum = (ai == null) ? null : ai.findDefaultEnumValue(enumCls);
return new EnumResolver(enumCls, enumValues, map, defaultEnum);
}
/**
* @since 2.9
*/
public static EnumResolver constructUsingMethod(Class> enumCls,
AnnotatedMember accessor,
AnnotationIntrospector ai)
{
Enum[] enumValues = enumCls.getEnumConstants();
HashMap> map = new HashMap>();
// from last to first, so that in case of duplicate values, first wins
for (int i = enumValues.length; --i >= 0; ) {
Enum en = enumValues[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());
}
}
Enum defaultEnum = (ai != null) ? ai.findDefaultEnumValue(enumCls) : null;
return new EnumResolver(enumCls, enumValues, map, defaultEnum);
}
/**
* This method is needed because of the dynamic nature of constructing Enum
* resolvers.
*/
@SuppressWarnings({ "unchecked" })
public static EnumResolver constructUnsafe(Class rawEnumCls, AnnotationIntrospector ai)
{
/* This is oh so wrong... but at least ugliness is mostly hidden in just
* this one place.
*/
Class> enumCls = (Class>) rawEnumCls;
return constructFor(enumCls, ai);
}
/**
* Method that needs to be used instead of {@link #constructUsingToString}
* if static type of enum is not known.
*
* @since 2.8
*/
@SuppressWarnings({ "unchecked" })
public static EnumResolver constructUnsafeUsingToString(Class rawEnumCls,
AnnotationIntrospector ai)
{
// oh so wrong... not much that can be done tho
Class> enumCls = (Class>) rawEnumCls;
return constructUsingToString(enumCls, ai);
}
/**
* Method used when actual String serialization is indicated using @JsonValue
* on a method.
*
* @since 2.9
*/
@SuppressWarnings({ "unchecked" })
public static EnumResolver constructUnsafeUsingMethod(Class rawEnumCls,
AnnotatedMember accessor,
AnnotationIntrospector ai)
{
// wrong as ever but:
Class> enumCls = (Class>) rawEnumCls;
return constructUsingMethod(enumCls, accessor, ai);
}
public CompactStringObjectMap constructLookup() {
return CompactStringObjectMap.construct(_enumsById);
}
public Enum findEnum(String key) { return _enumsById.get(key); }
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; }
}
