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.services.assets;
016    
017    import org.apache.tapestry5.services.assets.CompressionStatus;
018    import org.apache.tapestry5.services.assets.StreamableResource;
019    import org.apache.tapestry5.services.assets.StreamableResourceSource;
020    
021    /**
022     * Specialization of {@link SRSCachingInterceptor} that only attempts to cache
023     * compressed resources.
024     */
025    public class SRSCompressedCachingInterceptor extends SRSCachingInterceptor
026    {
027        public SRSCompressedCachingInterceptor(StreamableResourceSource delegate)
028        {
029            super(delegate);
030        }
031    
032        /**
033         * Return true only if the resource is compressed.
034         */
035        @Override
036        protected boolean isCacheable(StreamableResource resource)
037        {
038            return resource.getCompression() == CompressionStatus.COMPRESSED;
039        }
040    
041    }