001
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
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 }