/*
* Copyright (C) 2005 Joe Walnes.
* Copyright (C) 2006, 2007, 2008, 2009 XStream Committers.
* All rights reserved.
*
* The software in this package is published under the terms of the BSD
* style license a copy of which has been included with this distribution in
* the LICENSE.txt file.
*
* Created on 06. April 2005 by Joe Walnes
*/
// ***** READ THIS *****
// This class will only compile with JDK 1.5.0 or above as it test Java enums.
// If you are using an earlier version of Java, just don't try to build this class. XStream should work fine without it.
package com.thoughtworks.xstream.converters.enums;
import com.thoughtworks.xstream.converters.collections.MapConverter;
import com.thoughtworks.xstream.converters.ConversionException;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.mapper.Mapper;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.core.util.Fields;
import java.util.EnumMap;
import java.lang.reflect.Field;
/**
* Serializes an Java 5 EnumMap, including the type of Enum it's for. If a SecurityManager is set, the converter will only work with permissions
* for SecurityManager.checkPackageAccess, SecurityManager.checkMemberAccess(this, EnumSet.MEMBER)
* and ReflectPermission("suppressAccessChecks").
*
* @author Joe Walnes
*/
public class EnumMapConverter extends MapConverter {
private final static Field typeField;
static {
// field name is "keyType" in Sun JDK, but different in IKVM
Field assumedTypeField = null;
try {
Field[] fields = EnumMap.class.getDeclaredFields();
for (int i = 0; i < fields.length; i++ ) {
if (fields[i].getType() == Class.class) {
// take the fist member of type "Class"
assumedTypeField = fields[i];
assumedTypeField.setAccessible(true);
break;
}
}
if (assumedTypeField == null) {
throw new ExceptionInInitializerError("Cannot detect key type of EnumMap");
}
} catch (SecurityException ex) {
// ignore, no access possible with current SecurityManager
}
typeField = assumedTypeField;
}
public EnumMapConverter(Mapper mapper) {
super(mapper);
}
public boolean canConvert(Class type) {
return typeField != null && type == EnumMap.class;
}
public void marshal(Object source, HierarchicalStreamWriter writer, MarshallingContext context) {
Class type = (Class) Fields.read(typeField, source);
String attributeName = mapper().aliasForSystemAttribute("enum-type");
if (attributeName != null) {
writer.addAttribute(attributeName, mapper().serializedClass(type));
}
super.marshal(source, writer, context);
}
@SuppressWarnings("unchecked")
public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
String attributeName = mapper().aliasForSystemAttribute("enum-type");
if (attributeName == null) {
throw new ConversionException("No EnumType specified for EnumMap");
}
Class type = mapper().realClass(reader.getAttribute(attributeName));
EnumMap map = new EnumMap(type);
populateMap(reader, context, map);
return map;
}
}