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.ioc.Resource;
018    import org.apache.tapestry5.services.assets.*;
019    
020    import java.io.IOException;
021    
022    /**
023     * Loops the result through the {@link ResourceMinimizer} service.
024     */
025    public class SRSMinimizingInterceptor implements StreamableResourceSource
026    {
027        private final StreamableResourceSource delegate;
028    
029        private final ResourceMinimizer minimizer;
030    
031        public SRSMinimizingInterceptor(StreamableResourceSource delegate, ResourceMinimizer minimizer)
032        {
033            this.delegate = delegate;
034            this.minimizer = minimizer;
035        }
036    
037        public StreamableResource getStreamableResource(Resource baseResource, StreamableResourceProcessing processing, ResourceDependencies dependencies)
038                throws IOException
039        {
040            StreamableResource streamable = delegate.getStreamableResource(baseResource, processing, dependencies);
041    
042            if (processing != StreamableResourceProcessing.FOR_AGGREGATION)
043            {
044                return minimizer.minimize(streamable);
045            }
046    
047            return streamable;
048        }
049    
050    }