AssetAnnotationWorker


1   // Copyright 2005 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.tapestry.annotations;
16  
17  import java.lang.reflect.Method  ;
18  
19  import org.apache.hivemind.Location;
20  import org.apache.hivemind.Resource;
21  import org.apache.hivemind.impl.LocationImpl;
22  import org.apache.tapestry.enhance.EnhancementOperation;
23  import org.apache.tapestry.spec.AssetSpecification;
24  import org.apache.tapestry.spec.IAssetSpecification;
25  import org.apache.tapestry.spec.IComponentSpecification;
26  
27  /**
28   * Uses the {@link org.apache.tapestry.annotations.Asset} annotation to create a new
29   * {@link org.apache.tapestry.spec.IAssetSpecification} which is then added to the
30   * {@link org.apache.tapestry.spec.IComponentSpecification}.
31   * 
32   * @author Howard Lewis Ship
33   * @since 4.0
34   */
35  public class AssetAnnotationWorker implements MethodAnnotationEnhancementWorker
36  {
37  
38      public void performEnhancement(EnhancementOperation op, IComponentSpecification spec,
39              Method   method, Location location)
40      {
41          Asset asset = method.getAnnotation(Asset.class);
42          String   propertyName = AnnotationUtils.getPropertyName(method);
43  
44          IAssetSpecification as = new AssetSpecification();
45          as.setPath(asset.value());
46          as.setPropertyName(propertyName);
47  
48          // Very important for assets, as they need a location (really, the Resource
49          // of a location) to figure out what kind of asset they are.
50  
51          Resource specResource = spec.getSpecificationLocation();
52          Location assetLocation = new AnnotationLocation(specResource, location.toString());
53  
54          as.setLocation(assetLocation);
55  
56          spec.addAsset(propertyName, as);
57      }
58  
59  }
60
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