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 015package org.apache.tapestry.asset; 016 017import java.io.InputStream; 018import java.net.URL; 019 020import org.apache.hivemind.ApplicationRuntimeException; 021import org.apache.hivemind.Location; 022import org.apache.hivemind.Resource; 023import org.apache.hivemind.util.ClasspathResource; 024import org.apache.hivemind.util.Defense; 025import org.apache.tapestry.engine.IEngineService; 026import org.apache.tapestry.engine.ILink; 027 028/** 029 * An implementation of {@link org.apache.tapestry.IAsset}for localizable assets within the JVM's 030 * classpath. 031 * <p> 032 * The localization code here is largely cut-and-paste from {@link ContextAsset}. 033 * 034 * @author Howard Ship 035 */ 036 037public class PrivateAsset extends AbstractAsset 038{ 039 private IEngineService _assetService; 040 041 /** 042 * @deprecated To be removed (someday). Use 043 * {@link #PrivateAsset(ClasspathResource, IEngineService, Location)} instead. 044 */ 045 public PrivateAsset(ClasspathResource resourceLocation, Location location) 046 { 047 this(resourceLocation, null, location); 048 } 049 050 public PrivateAsset(ClasspathResource resourceLocation, IEngineService assetService, 051 Location location) 052 { 053 super(resourceLocation, location); 054 055 Defense.notNull(assetService, "assetService"); 056 057 _assetService = assetService; 058 } 059 060 /** 061 * Gets the localized version of the resource. Build the URL for the resource. If possible, the 062 * application's {@link AssetExternalizerImpl}is located, to copy the resource to a directory 063 * visible to the web server. 064 */ 065 066 public String buildURL() 067 { 068 String path = getResourceLocation().getPath(); 069 070 ILink link = _assetService.getLink(false, path); 071 072 return link.getURL(); 073 } 074 075 public InputStream getResourceAsStream() 076 { 077 Resource location = getResourceLocation(); 078 079 try 080 { 081 URL url = location.getResourceURL(); 082 083 return url.openStream(); 084 } 085 catch (Exception ex) 086 { 087 throw new ApplicationRuntimeException(AssetMessages.noSuchResource(location.getPath())); 088 } 089 } 090 091}