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.ClassResolver;
019    import org.apache.hivemind.Location;
020    import org.apache.hivemind.Resource;
021    import org.apache.hivemind.util.ClasspathResource;
022    import org.apache.tapestry.IAsset;
023    import org.apache.tapestry.engine.IEngineService;
024    import org.apache.tapestry.l10n.ResourceLocalizer;
025    import org.apache.tapestry.spec.IComponentSpecification;
026    
027    import java.util.Locale;
028    
029    /**
030     * Creates instances of {@link org.apache.tapestry.asset.PrivateAsset}, which are the holders of
031     * classpath: resources.
032     * 
033     * @author Howard M. Lewis Ship
034     * @since 4.0
035     */
036    public class ClasspathAssetFactory implements AssetFactory
037    {
038        private ClassResolver _classResolver;
039    
040        private IEngineService _assetService;
041    
042        private ResourceLocalizer _localizer;
043    
044        private Resource _rootClassPath;
045    
046        public boolean assetExists(IComponentSpecification spec, Resource baseResource, String path, Locale locale)
047        {
048            Resource assetResource = null;
049            if (path.startsWith("/")) {
050    
051                if (_rootClassPath == null) {
052                    _rootClassPath = new ClasspathResource(_classResolver, "");
053                }
054    
055                assetResource = _rootClassPath.getRelativeResource(path);
056            } else {
057                
058                assetResource = baseResource.getRelativeResource(path);
059            }
060    
061            Resource localized = _localizer.findLocalization(assetResource, locale);
062    
063            return localized != null;
064        }
065    
066        public IAsset createAsset(Resource baseResource, IComponentSpecification spec, String path, Locale locale, Location location)
067        {
068            Resource asset = baseResource.getRelativeResource(path);
069            Resource localized = _localizer.findLocalization(asset, locale);
070    
071            if (localized == null)
072                throw new ApplicationRuntimeException(AssetMessages.missingAsset(path, baseResource), 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 ClasspathResource(_classResolver, path);
080            Resource localized = _localizer.findLocalization(base, locale);
081    
082            if (localized == null)
083                throw new ApplicationRuntimeException(AssetMessages.missingClasspathResource(path), location, null);
084    
085            return createAsset(localized, location);
086        }
087    
088        public IAsset createAsset(Resource resource, Location location)
089        {
090            return new PrivateAsset(resource, _assetService, location);
091        }
092    
093        public void setAssetService(IEngineService assetService)
094        {
095            _assetService = assetService;
096        }
097    
098        public void setClassResolver(ClassResolver classResolver)
099        {
100            _classResolver = classResolver;
101        }
102    
103        public void setLocalizer(ResourceLocalizer localizer)
104        {
105            _localizer = localizer;
106        }
107    }