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.annotations;
016    
017    import java.lang.reflect.Method;
018    
019    import org.apache.hivemind.Location;
020    import org.apache.hivemind.Resource;
021    import org.apache.tapestry.enhance.EnhancementOperation;
022    import org.apache.tapestry.spec.AssetSpecification;
023    import org.apache.tapestry.spec.IAssetSpecification;
024    import org.apache.tapestry.spec.IComponentSpecification;
025    import org.apache.tapestry.util.DescribedLocation;
026    
027    /**
028     * Uses the {@link org.apache.tapestry.annotations.Asset} annotation to create a new
029     * {@link org.apache.tapestry.spec.IAssetSpecification} which is then added to the
030     * {@link org.apache.tapestry.spec.IComponentSpecification}.
031     * 
032     * @author Howard Lewis Ship
033     * @since 4.0
034     */
035    public class AssetAnnotationWorker implements MethodAnnotationEnhancementWorker
036    {
037    
038        public void performEnhancement(EnhancementOperation op, IComponentSpecification spec,
039                Method method, Location location)
040        {
041            Asset asset = method.getAnnotation(Asset.class);
042            String propertyName = AnnotationUtils.getPropertyName(method);
043    
044            IAssetSpecification as = new AssetSpecification();
045            as.setPath(asset.value());
046            as.setPropertyName(propertyName);
047    
048            // Very important for assets, as they need a location (really, the Resource
049            // of a location) to figure out what kind of asset they are.
050    
051            Resource specResource = spec.getSpecificationLocation();
052            Location assetLocation = new DescribedLocation(specResource, location.toString());
053    
054            as.setLocation(assetLocation);
055    
056            spec.addAsset(propertyName, as);
057        }
058    
059    }