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 org.apache.hivemind.ApplicationRuntimeException;
018 import org.apache.hivemind.Location;
019 import org.apache.hivemind.Resource;
020 import org.apache.tapestry.IAsset;
021 import org.apache.tapestry.IRequestCycle;
022 import org.apache.tapestry.l10n.ResourceLocalizer;
023 import org.apache.tapestry.spec.IComponentSpecification;
024 import org.apache.tapestry.web.WebContext;
025 import org.apache.tapestry.web.WebContextResource;
026
027 import java.util.Locale;
028
029 /**
030 * All "context:" prefixed asset paths are interpreted relative to the web context (the web
031 * application's root folder).
032 *
033 * @author Howard M. Lewis Ship
034 * @since 4.0
035 */
036 public class ContextAssetFactory implements AssetFactory
037 {
038 private String _contextPath;
039
040 private WebContext _webContext;
041
042 private ResourceLocalizer _localizer;
043
044 private IRequestCycle _requestCycle;
045
046 public void setWebContext(WebContext webContext)
047 {
048 _webContext = webContext;
049 }
050
051 public boolean assetExists(IComponentSpecification spec, Resource baseResource, String path, Locale locale)
052 {
053 return findAsset(spec, baseResource, path, locale) != null;
054 }
055
056 Resource findAsset(IComponentSpecification spec, Resource baseResource, String path, Locale locale)
057 {
058 Resource assetResource = baseResource.getRelativeResource("/").getRelativeResource(path);
059 Resource localized = _localizer.findLocalization(assetResource, locale);
060
061 if (localized == null) {
062
063 assetResource = baseResource.getRelativeResource(path);
064 localized = _localizer.findLocalization(assetResource, locale);
065 }
066
067 if (localized == null && spec != null && spec.getLocation().getResource() != null) {
068 // try relative to specification
069
070 assetResource = spec.getLocation().getResource().getRelativeResource("/").getRelativeResource(path);
071
072 localized = _localizer.findLocalization(assetResource, locale);
073 }
074
075 if (localized == null || localized.getResourceURL() == null) {
076
077 // try relative to context root
078
079 // paths must begin with "/" for context resolution
080
081 if (path != null && !path.startsWith("/"))
082 path = "/" + path;
083
084 Resource base = new WebContextResource(_webContext, path);
085 localized = _localizer.findLocalization(base, locale);
086 }
087
088 return localized;
089 }
090
091 public IAsset createAsset(Resource baseResource, IComponentSpecification spec, String path, Locale locale, Location location)
092 {
093 Resource localized = findAsset(spec, baseResource, path, locale);
094
095 // We always create a new asset relative to an existing resource; the type of resource
096 // will jive with the type of asset returned. Path may start with a leading slash, which
097 // yields an absolute, not relative, path to the resource.
098
099 if ( (localized == null || localized.getResourceURL() == null)
100 && path.startsWith("/")) {
101
102 return createAbsoluteAsset(path, locale, location);
103 }
104
105 if (localized == null)
106 throw new ApplicationRuntimeException(AssetMessages.missingAsset(path, baseResource), location, null);
107
108 return createAsset(localized, location);
109 }
110
111 public IAsset createAbsoluteAsset(String path, Locale locale, Location location)
112 {
113 Resource base = new WebContextResource(_webContext, path);
114 Resource localized = _localizer.findLocalization(base, locale);
115
116 if (localized == null)
117 throw new ApplicationRuntimeException(AssetMessages.missingContextResource(path), location, null);
118
119 return createAsset(localized, location);
120 }
121
122 public IAsset createAsset(Resource resource, Location location)
123 {
124 return new ContextAsset(_contextPath, resource, location, _requestCycle);
125 }
126
127 public void setContextPath(String contextPath)
128 {
129 _contextPath = contextPath;
130 }
131
132 public void setLocalizer(ResourceLocalizer localizer)
133 {
134 _localizer = localizer;
135 }
136
137 public void setRequestCycle(IRequestCycle cycle)
138 {
139 _requestCycle = cycle;
140 }
141 }