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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.extend;

/**
 * An interface to the various methods of compressing web resources.
 * This primarily means JavaScript, but could in theory extend to other
 * resources like CSS, HTML, etc.
 * @author David Marginian [david at butterdev dot com]
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface Compressor
{
    /**
     * Compress a JavaScript file to a smaller version of the original
     * @param script The script to compress
     * @return The compressed script
     * @throws Exception The implementations of this interface are all likely to
     * have different things they can throw. We are going to catch Exception
     * anyway because we can continue (by using uncompressed scripts) so why
     * force implementors to nest to another exception type when we can just let
     * them use the original exception?
     */
    public String compressJavaScript(String script) throws Exception;
}