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.services.impl;
016    
017    import org.apache.hivemind.Location;
018    import org.apache.hivemind.Resource;
019    import org.apache.hivemind.util.Defense;
020    import org.apache.tapestry.IAsset;
021    import org.apache.tapestry.asset.AssetSource;
022    import org.apache.tapestry.engine.ISpecificationSource;
023    import org.apache.tapestry.services.NamespaceResources;
024    import org.apache.tapestry.spec.IComponentSpecification;
025    import org.apache.tapestry.spec.ILibrarySpecification;
026    
027    /**
028     * Implementation of {@link org.apache.tapestry.services.NamespaceResources}.
029     * 
030     * @author Howard M. Lewis Ship
031     */
032    public class NamespaceResourcesImpl implements NamespaceResources
033    {
034        private final ISpecificationSource _specificationSource;
035    
036        private final AssetSource _assetSource;
037    
038        public NamespaceResourcesImpl(ISpecificationSource source, AssetSource assetSource)
039        {
040            Defense.notNull(source, "source");
041            Defense.notNull(assetSource, "assetSource");
042    
043            _specificationSource = source;
044            _assetSource = assetSource;
045        }
046    
047        public ILibrarySpecification findChildLibrarySpecification(Resource parentResource,
048                String path, Location location)
049        {
050            Resource childResource = findSpecificationResource(parentResource, path, location);
051    
052            return _specificationSource.getLibrarySpecification(childResource);
053    
054        }
055    
056        private Resource findSpecificationResource(Resource libraryResource, String path, Location location)
057        {
058            // TODO: This is where we'll play with assets and asset prefixes
059            
060            IAsset childAsset = _assetSource.findAsset(libraryResource, path, null, location);
061    
062            Resource childResource = childAsset.getResourceLocation();
063            
064            return childResource;
065        }
066    
067        public IComponentSpecification getPageSpecification(Resource resource,
068                String specificationPath, Location location)
069        {
070            Resource pageSpecificationResource = findSpecificationResource(
071                    resource,
072                    specificationPath,
073                    location);
074    
075            return _specificationSource.getPageSpecification(pageSpecificationResource);
076        }
077    
078        public IComponentSpecification getComponentSpecification(Resource resource,
079                String specificationPath, Location location)
080        {
081            Resource componentSpecificationResource = findSpecificationResource(
082                    resource,
083                    specificationPath,
084                    location);
085    
086            return _specificationSource.getComponentSpecification(componentSpecificationResource);
087        }
088    
089    }