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