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 015package org.apache.tapestry.annotations; 016 017import java.lang.reflect.Method; 018 019import org.apache.hivemind.Location; 020import org.apache.hivemind.Resource; 021import org.apache.tapestry.enhance.EnhancementOperation; 022import org.apache.tapestry.spec.AssetSpecification; 023import org.apache.tapestry.spec.IAssetSpecification; 024import org.apache.tapestry.spec.IComponentSpecification; 025import 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 */ 035public 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}