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
015package org.apache.tapestry5.internal.yuicompressor;
016
017import com.yahoo.platform.yui.compressor.CssCompressor;
018import org.apache.tapestry5.ioc.OperationTracker;
019import org.apache.tapestry5.services.assets.StreamableResource;
020import org.slf4j.Logger;
021
022import java.io.IOException;
023import java.io.Reader;
024import java.io.Writer;
025
026/**
027 * Uses {@link CssCompressor} to reduce the size of CSS content.
028 *
029 * @since 5.3
030 */
031public 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}