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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 org.directwebremoting.json.parse.JsonDecoder;
import org.directwebremoting.json.parse.JsonParseException;

/**
 * A {@link JsonDecoder} that doesn't do anything, which is useful for
 * validations that don't need to get any data, just check it's validity.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class IgnoreJsonDecoder implements JsonDecoder
{
    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#getRoot()
     */
    public Object getRoot()
    {
        return null;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#addBoolean(java.lang.String, boolean)
     */
    public void addBoolean(String propertyName, boolean value) throws JsonParseException
    {
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#addNull(java.lang.String)
     */
    public void addNull(String propertyName) throws JsonParseException
    {
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#addNumber(java.lang.String, java.lang.String, java.lang.String, java.lang.String)
     */
    public void addNumber(String propertyName, String intPart, String floatPart, String expPart) throws JsonParseException
    {
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#addString(java.lang.String, java.lang.String)
     */
    public void addString(String propertyName, String value) throws JsonParseException
    {
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#beginArray(java.lang.String)
     */
    public void beginArray(String propertyName) throws JsonParseException
    {
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#beginObject(java.lang.String)
     */
    public void beginObject(String propertyName) throws JsonParseException
    {
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#endArray(java.lang.String)
     */
    public void endArray(String propertyName) throws JsonParseException
    {
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.json.parse.JsonDecoder#endObject(java.lang.String)
     */
    public void endObject(String propertyName) throws JsonParseException
    {
    }
}