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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 boiler plate code between the web browser and your Java code.

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/*
 * Copyright 2005 Joe Walker
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.directwebremoting.json.parse;

import java.io.Reader;

/**
 * Parse some JSON input and produce some objects that represent the input.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface JsonParser
{
    /**
     * Walk along the json input calling methods on
     * decoder as we discover new tokens in the input.
     * @param input The json data source
     * @param decoder The decoder to turn parse events into a data tree.
     * @return The object constructed by the {@link JsonDecoder}.
     * @throws JsonParseException If the input is not valid.
     */
    Object parse(Reader input, JsonDecoder decoder) throws JsonParseException;
}