001    // Copyright 2011 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    // http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.internal.yuicompressor;
016    
017    import com.yahoo.platform.yui.compressor.CssCompressor;
018    import org.apache.tapestry5.ioc.OperationTracker;
019    import org.apache.tapestry5.services.assets.StreamableResource;
020    import org.slf4j.Logger;
021    
022    import java.io.IOException;
023    import java.io.Reader;
024    import java.io.Writer;
025    
026    /**
027     * Uses {@link CssCompressor} to reduce the size of CSS content.
028     *
029     * @since 5.3
030     */
031    public class CSSResourceMinimizer extends AbstractMinimizer
032    {
033        public CSSResourceMinimizer(Logger logger, OperationTracker tracker)
034        {
035            super(logger, tracker, "CSS");
036        }
037    
038        @Override
039        protected void doMinimize(StreamableResource input, Writer output) throws IOException
040        {
041            Reader reader = toReader(input);
042    
043            try
044            {
045                new CssCompressor(reader).compress(output, -1);
046            } finally
047            {
048                reader.close();
049            }
050        }
051    
052    }