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
015 package org.apache.tapestry.asset;
016
017 import java.util.Locale;
018
019 import org.apache.hivemind.ApplicationRuntimeException;
020 import org.apache.hivemind.Location;
021 import org.apache.hivemind.Resource;
022 import org.apache.tapestry.IAsset;
023 import org.apache.tapestry.IRequestCycle;
024 import org.apache.tapestry.l10n.ResourceLocalizer;
025 import org.apache.tapestry.web.WebContext;
026 import 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 */
035 public 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 }