/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.apache.myfaces.buildtools.maven2.plugin.javascript.jmt.compress;

import java.io.File;

/**
 * Abstraction of a JS compression tool.
 */
public interface JSCompressor
{

    /**
     * Constants for optimization level
     */
    int NONE = 0;

    int MAX = 9;

    /**
     * Javascript language versions
     */
    int JAVASCRIPT_1_1 = 110;

    int JAVASCRIPT_1_2 = 120;

    int JAVASCRIPT_1_3 = 130;

    /**
     * Compress the input script file into the output file (may be same).
     * 
     * @param input source to get compressed
     * @param output compressed script
     * @param level optimization level from 0 to 9. May have various
     * signification dependending on the compressor, from beeing ignored to some
     * fine tweaking the output.
     * @param language version of javascript to be used ("130" for JS 1.3), as
     * defined by Mozilla Rhino engine
     * @throws CompressionException any error during compression
     */
    void compress( File input, File output, int level, int language )
        throws CompressionException;
}