001    /**
002     * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.minifier;
016    
017    import com.liferay.portal.kernel.io.unsync.UnsyncStringReader;
018    import com.liferay.portal.kernel.io.unsync.UnsyncStringWriter;
019    import com.liferay.portal.kernel.log.Log;
020    import com.liferay.portal.kernel.log.LogFactoryUtil;
021    import com.liferay.portal.kernel.util.InstanceFactory;
022    import com.liferay.portal.util.PropsValues;
023    
024    import com.yahoo.platform.yui.compressor.CssCompressor;
025    
026    /**
027     * @author Brian Wing Shun Chan
028     * @author Raymond Aug??
029     */
030    public class MinifierUtil {
031    
032            public static String minifyCss(String content) {
033                    if (!PropsValues.MINIFIER_ENABLED) {
034                            return content;
035                    }
036    
037                    return _instance._minifyCss(content);
038            }
039    
040            public static String minifyJavaScript(String resourceName, String content) {
041                    if (!PropsValues.MINIFIER_ENABLED) {
042                            return content;
043                    }
044    
045                    return _instance._minifyJavaScript(resourceName, content);
046            }
047    
048            private static JavaScriptMinifier _getJavaScriptMinifier() {
049                    try {
050                            return (JavaScriptMinifier)InstanceFactory.newInstance(
051                                    PropsValues.MINIFIER_JAVASCRIPT_IMPL);
052                    }
053                    catch (Exception e) {
054                            _log.error(
055                                    "Unable to instantiate "+ PropsValues.MINIFIER_JAVASCRIPT_IMPL);
056    
057                            return new GoogleJavaScriptMinifier();
058                    }
059            }
060    
061            private MinifierUtil() {
062                    _javaScriptMinifierInstance = _getJavaScriptMinifier();
063            }
064    
065            private String _minifyCss(String content) {
066                    UnsyncStringWriter unsyncStringWriter = new UnsyncStringWriter();
067    
068                    try {
069                            CssCompressor cssCompressor = new CssCompressor(
070                                    new UnsyncStringReader(content));
071    
072                            cssCompressor.compress(
073                                    unsyncStringWriter, PropsValues.YUI_COMPRESSOR_CSS_LINE_BREAK);
074                    }
075                    catch (Exception e) {
076                            _log.error("Unable to minfiy CSS:\n" + content);
077    
078                            unsyncStringWriter.append(content);
079                    }
080    
081                    return unsyncStringWriter.toString();
082            }
083    
084            private String _minifyJavaScript(String resourceName, String content) {
085                    return _javaScriptMinifierInstance.compress(resourceName, content);
086            }
087    
088            private static final Log _log = LogFactoryUtil.getLog(MinifierUtil.class);
089    
090            private static final MinifierUtil _instance = new MinifierUtil();
091    
092            private final JavaScriptMinifier _javaScriptMinifierInstance;
093    
094    }