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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
/*
* Copyright (C) 2005 Joe Walnes.
* Copyright (C) 2006, 2007, 2009, 2015 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 31. January 2005 by Joe Walnes
*/
package com.feilong.lib.xstream.mapper;
import java.lang.reflect.Field;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import com.feilong.lib.xstream.core.Caching;
/**
* Mapper that uses a more meaningful alias for the field in an inner class (this$0) that refers to the outer class.
*
* @author Joe Walnes
*/
public class OuterClassMapper extends MapperWrapper implements Caching{
private static final String[] EMPTY_NAMES = new String[0];
private final String alias;
private final Map innerFields;
public OuterClassMapper(Mapper wrapped){
this(wrapped, "outer-class");
}
public OuterClassMapper(Mapper wrapped, String alias){
super(wrapped);
this.alias = alias;
innerFields = Collections.synchronizedMap(new HashMap());
innerFields.put(Object.class.getName(), EMPTY_NAMES);
}
@Override
public String serializedMember(Class type,String memberName){
if (memberName.startsWith("this$")){
final String[] innerFieldNames = getInnerFieldNames(type);
for (int i = 0; i < innerFieldNames.length; ++i){
if (innerFieldNames[i].equals(memberName)){
return i == 0 ? alias : alias + '-' + i;
}
}
}
return super.serializedMember(type, memberName);
}
@Override
public String realMember(Class type,String serialized){
if (serialized.startsWith(alias)){
int idx = -1;
final int len = alias.length();
if (len == serialized.length()){
idx = 0;
}else if (serialized.length() > len + 1 && serialized.charAt(len) == '-'){
idx = Integer.valueOf(serialized.substring(len + 1)).intValue();
}
if (idx >= 0){
final String[] innerFieldNames = getInnerFieldNames(type);
if (idx < innerFieldNames.length){
return innerFieldNames[idx];
}
}
}
return super.realMember(type, serialized);
}
private String[] getInnerFieldNames(final Class type){
String[] innerFieldNames = (String[]) innerFields.get(type.getName());
if (innerFieldNames == null){
innerFieldNames = getInnerFieldNames(type.getSuperclass());
Field[] declaredFields = type.getDeclaredFields();
for (final Field field : declaredFields){
if (field.getName().startsWith("this$")){
String[] temp = new String[innerFieldNames.length + 1];
System.arraycopy(innerFieldNames, 0, temp, 0, innerFieldNames.length);
innerFieldNames = temp;
innerFieldNames[innerFieldNames.length - 1] = field.getName();
}
}
innerFields.put(type.getName(), innerFieldNames);
}
return innerFieldNames;
}
@Override
public void flushCache(){
innerFields.keySet().retainAll(Collections.singletonList(Object.class.getName()));
}
}