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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.

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package org.directwebremoting.json.parse.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class SimpleJsonDecoder extends StatefulJsonDecoder
{
    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.impl.StatefulJsonDecoder#createObject(Object, String)
     */
    @Override
    protected Map createObject(Object parent, String propertyName)
    {
        return new HashMap();
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.impl.StatefulJsonDecoder#createArray(Object, String)
     */
    @Override
    protected ArrayList createArray(Object parent, String propertyName)
    {
        return new ArrayList();
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.impl.StatefulJsonDecoder#addMember(java.lang.Object, java.lang.String, java.lang.Object)
     */
    @Override
    protected void addMemberToObject(Object parent, String propertyName, Object member)
    {
        @SuppressWarnings("unchecked")
        Map map = (Map) parent;
        map.put(propertyName, member);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.impl.StatefulJsonDecoder#addMember(java.lang.Object)
     */
    @Override
    protected void addMemberToArray(Object parent, Object member)
    {
        @SuppressWarnings("unchecked")
        List array = (List) parent;
        array.add(member);
    }
}