001// Copyright 2010 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; 018 019import org.apache.tapestry5.internal.services.AssetResourceLocator; 020import org.apache.tapestry5.internal.services.ResourceStreamer; 021import org.apache.tapestry5.ioc.Resource; 022import org.apache.tapestry5.services.ClasspathAssetAliasManager; 023import org.apache.tapestry5.services.Request; 024import org.apache.tapestry5.services.Response; 025import org.apache.tapestry5.services.assets.AssetRequestHandler; 026 027/** 028 * A handler for asset requests for classpath assets (within a specific folder). 029 * Each mapping of the {@link ClasspathAssetAliasManager} gets one of these. 030 * 031 * @since 5.2.0 032 */ 033public class ClasspathAssetRequestHandler implements AssetRequestHandler 034{ 035 private final ResourceStreamer streamer; 036 037 private final AssetResourceLocator assetResourceLocator; 038 039 private final String baseFolder; 040 041 public ClasspathAssetRequestHandler(ResourceStreamer streamer, AssetResourceLocator assetResourceLocator, 042 String baseFolder) 043 { 044 this.streamer = streamer; 045 this.assetResourceLocator = assetResourceLocator; 046 this.baseFolder = baseFolder; 047 } 048 049 public boolean handleAssetRequest(Request request, Response response, String extraPath) throws IOException 050 { 051 String assetPath = baseFolder + "/" + extraPath; 052 053 Resource resource = assetResourceLocator.findClasspathResourceForPath(assetPath); 054 055 if (resource == null) 056 return false; 057 058 streamer.streamResource(resource); 059 060 return true; 061 } 062}