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.services.assets;
016
017import java.io.IOException;
018import java.util.Map;
019
020import org.apache.tapestry5.ioc.annotations.Marker;
021import org.apache.tapestry5.ioc.annotations.Primary;
022import org.apache.tapestry5.services.assets.ResourceMinimizer;
023import org.apache.tapestry5.services.assets.StreamableResource;
024
025/**
026 * Implementation that delegates, via its configuration, to a real implementation based on the content type of the
027 * resource.
028 */
029@Marker(Primary.class)
030public class MasterResourceMinimizer implements ResourceMinimizer
031{
032    private final Map<String, ResourceMinimizer> configuration;
033
034    public MasterResourceMinimizer(Map<String, ResourceMinimizer> configuration)
035    {
036        this.configuration = configuration;
037    }
038
039    /** Does nothing; an override of this service can be installed to provide minimization. */
040    public StreamableResource minimize(StreamableResource resource) throws IOException
041    {
042        ResourceMinimizer minimizer = configuration.get(resource.getContentType());
043
044        return minimizer == null ? resource : minimizer.minimize(resource);
045    }
046}