    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    }