001 // Copyright 2004, 2005 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.tapestry.asset; 016 017 import java.io.InputStream; 018 import java.net.URL; 019 020 import org.apache.hivemind.ApplicationRuntimeException; 021 import org.apache.hivemind.Location; 022 import org.apache.hivemind.Resource; 023 import org.apache.hivemind.util.ClasspathResource; 024 import org.apache.tapestry.IRequestCycle; 025 import org.apache.tapestry.Tapestry; 026 import org.apache.tapestry.engine.IEngineService; 027 import org.apache.tapestry.engine.ILink; 028 029 /** 030 * An implementation of {@link org.apache.tapestry.IAsset}for localizable assets within the JVM's 031 * classpath. 032 * <p> 033 * The localization code here is largely cut-and-paste from {@link ContextAsset}. 034 * 035 * @author Howard Ship 036 */ 037 038 public class PrivateAsset extends AbstractAsset 039 { 040 private IEngineService _assetService; 041 042 /** 043 * @deprecated To be removed (someday). Use 044 * {@link #PrivateAsset(ClasspathResource, IEngineService, Location)} instead. 045 */ 046 public PrivateAsset(ClasspathResource resourceLocation, Location location) 047 { 048 this(resourceLocation, null, location); 049 } 050 051 public PrivateAsset(ClasspathResource resourceLocation, IEngineService assetService, 052 Location location) 053 { 054 super(resourceLocation, location); 055 056 _assetService = assetService; 057 } 058 059 /** 060 * Gets the localized version of the resource. Build the URL for the resource. If possible, the 061 * application's {@link AssetExternalizerImpl}is located, to copy the resource to a directory 062 * visible to the web server. 063 */ 064 065 public String buildURL(IRequestCycle cycle) 066 { 067 String path = getResourceLocation().getPath(); 068 069 // ClasspathAssetFactory will provide the asset service as a constructor 070 // parameter, but there are a few odd uses of PrivateAsset where this 071 // is not handy. 072 073 if (_assetService == null) 074 _assetService = cycle.getEngine().getService(Tapestry.ASSET_SERVICE); 075 076 ILink link = _assetService.getLink(cycle, false, path); 077 078 return link.getURL(); 079 } 080 081 public InputStream getResourceAsStream(IRequestCycle cycle) 082 { 083 Resource location = getResourceLocation(); 084 085 try 086 { 087 URL url = location.getResourceURL(); 088 089 return url.openStream(); 090 } 091 catch (Exception ex) 092 { 093 throw new ApplicationRuntimeException(AssetMessages.noSuchResource(location.getPath())); 094 } 095 } 096 097 }