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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) 2003, 2004 Joe Walnes.
 * Copyright (C) 2006, 2007, 2012 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 03. October 2003 by Joe Walnes
 */
package com.feilong.lib.xstream.converters.basic;

import com.feilong.lib.xstream.converters.Converter;
import com.feilong.lib.xstream.converters.MarshallingContext;
import com.feilong.lib.xstream.converters.UnmarshallingContext;
import com.feilong.lib.xstream.io.ExtendedHierarchicalStreamWriterHelper;
import com.feilong.lib.xstream.io.HierarchicalStreamReader;
import com.feilong.lib.xstream.io.HierarchicalStreamWriter;
import com.feilong.lib.xstream.mapper.Mapper;

/**
 * Special converter to signify nulls at the root level.
 *
 * @author Joe Walnes
 */
public class NullConverter implements Converter{

    @Override
    public boolean canConvert(Class type){
        return type == null || Mapper.Null.class.isAssignableFrom(type);
    }

    @Override
    public void marshal(Object source,HierarchicalStreamWriter writer,MarshallingContext context){
        ExtendedHierarchicalStreamWriterHelper.startNode(writer, "null", Mapper.Null.class);
        writer.endNode();
    }

    @Override
    public Object unmarshal(HierarchicalStreamReader reader,UnmarshallingContext context){
        return null;
    }
}