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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.

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/*
 * Copyright (C) 2005 Joe Walnes.
 * Copyright (C) 2006, 2007, 2008, 2009, 2011, 2013, 2014 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 22. January 2005 by Joe Walnes
 */
package com.feilong.lib.xstream.mapper;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import com.feilong.lib.xstream.XStreamException;
import com.feilong.lib.xstream.core.Caching;
import com.feilong.lib.xstream.security.ForbiddenClassException;

/**
 * Mapper that caches which names map to which classes. Prevents repetitive searching and class loading.
 *
 * @author Joe Walnes
 * @author Jörg Schaible
 */
public class CachingMapper extends MapperWrapper implements Caching{

    private transient Map realClassCache;

    public CachingMapper(Mapper wrapped){
        super(wrapped);
        readResolve();
    }

    @Override
    public Class realClass(String elementName){
        Object cached = realClassCache.get(elementName);
        if (cached != null){
            if (cached instanceof Class){
                return (Class) cached;
            }
            throw (XStreamException) cached;
        }

        try{
            Class result = super.realClass(elementName);
            realClassCache.put(elementName, result);
            return result;
        }catch (ForbiddenClassException e){
            realClassCache.put(elementName, e);
            throw e;
        }catch (CannotResolveClassException e){
            realClassCache.put(elementName, e);
            throw e;
        }
    }

    @Override
    public void flushCache(){
        realClassCache.clear();
    }

    private Object readResolve(){
        realClassCache = Collections.synchronizedMap(new HashMap(128));
        return this;
    }
}