001// Copyright 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.util.Locale; 018 019import org.apache.hivemind.ApplicationRuntimeException; 020import org.apache.hivemind.Location; 021import org.apache.hivemind.Resource; 022import org.apache.tapestry.IAsset; 023import org.apache.tapestry.IRequestCycle; 024import org.apache.tapestry.l10n.ResourceLocalizer; 025import org.apache.tapestry.web.WebContext; 026import org.apache.tapestry.web.WebContextResource; 027 028/** 029 * All "context:" prefixed asset paths are interpreted relative to the web context (the web 030 * application's root folder). 031 * 032 * @author Howard M. Lewis Ship 033 * @since 4.0 034 */ 035public class ContextAssetFactory implements AssetFactory 036{ 037 private String _contextPath; 038 039 private AssetFactory _classpathAssetFactory; 040 041 private WebContext _webContext; 042 043 private ResourceLocalizer _localizer; 044 045 private IRequestCycle _requestCycle; 046 047 public void setWebContext(WebContext webContext) 048 { 049 _webContext = webContext; 050 } 051 052 public IAsset createAsset(Resource baseResource, String path, Locale locale, Location location) 053 { 054 // We always create a new asset relative to an existing resource; the type of resource 055 // will jive with the type of asset returned. Path may start with a leading slash, which 056 // yields an absolute, not relative, path to the resource. 057 058 Resource assetResource = baseResource.getRelativeResource(path); 059 060 // Here's the thing; In Tapestry 3.0 and earlier, you could specify 061 // library path like /org/apache/tapestry/contrib/Contrib.library. In the new scheme 062 // of things, that should be "classpath:/org/apache/tapestry/contrib/Contrib.library". 063 // But to keep a lot of things from breaking, we'll kludgely allow that here. 064 065 if (assetResource.getResourceURL() == null && path.startsWith("/")) 066 return _classpathAssetFactory.createAbsoluteAsset(path, locale, location); 067 068 Resource localized = _localizer.findLocalization(assetResource, locale); 069 070 if (localized == null) 071 throw new ApplicationRuntimeException(AssetMessages.missingAsset(path, baseResource), 072 location, null); 073 074 return createAsset(localized, location); 075 } 076 077 public IAsset createAbsoluteAsset(String path, Locale locale, Location location) 078 { 079 Resource base = new WebContextResource(_webContext, path); 080 Resource localized = _localizer.findLocalization(base, locale); 081 082 if (localized == null) 083 throw new ApplicationRuntimeException(AssetMessages.missingContextResource(path), 084 location, null); 085 086 return createAsset(localized, location); 087 } 088 089 public IAsset createAsset(Resource resource, Location location) 090 { 091 return new ContextAsset(_contextPath, resource, location, _requestCycle); 092 } 093 094 public void setContextPath(String contextPath) 095 { 096 _contextPath = contextPath; 097 } 098 099 public void setClasspathAssetFactory(AssetFactory classpathAssetFactory) 100 { 101 _classpathAssetFactory = classpathAssetFactory; 102 } 103 104 public void setLocalizer(ResourceLocalizer localizer) 105 { 106 _localizer = localizer; 107 } 108 109 public void setRequestCycle(IRequestCycle cycle) 110 { 111 _requestCycle = cycle; 112 } 113}