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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  
20  package org.apache.myfaces.tobago.facelets;
21  
22  import org.apache.myfaces.tobago.component.MethodExpressionToMethodBinding;
23  import org.apache.myfaces.tobago.event.TabChangeEvent;
24  import org.apache.myfaces.tobago.event.TabChangeSource;
25  
26  import javax.faces.view.facelets.FaceletContext;
27  import javax.faces.view.facelets.MetaRule;
28  import javax.faces.view.facelets.Metadata;
29  import javax.faces.view.facelets.MetadataTarget;
30  import javax.faces.view.facelets.TagAttribute;
31  
32  public class TabChangeSourceRule extends MetaRule {
33    static final Class[] ACTION_LISTENER = new Class[]{TabChangeEvent.class};
34    public static final TabChangeSourceRule INSTANCE = new TabChangeSourceRule();
35  
36    public Metadata applyRule(String name, TagAttribute attribute,
37        MetadataTarget metadataTarget) {
38      if (metadataTarget.isTargetInstanceOf(TabChangeSource.class)) {
39        if ("tabChangeListener".equals(name)) {
40          return new TabChangeListenerMapper(attribute);
41        }
42      }
43      return null;
44    }
45  
46    static final class TabChangeListenerMapper extends Metadata {
47  
48      private final TagAttribute attribute;
49  
50      public TabChangeListenerMapper(TagAttribute attribute) {
51        this.attribute = attribute;
52      }
53  
54      public void applyMetadata(FaceletContext ctx, Object instance) {
55        ((TabChangeSource) instance).setTabChangeListener(
56            new MethodExpressionToMethodBinding(
57                attribute.getMethodExpression(ctx, null, TabChangeSourceRule.ACTION_LISTENER)));
58      }
59    }
60  }