View Javadoc

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  package org.apache.myfaces.custom.tree.taglib;
20  
21  import java.io.IOException;
22  
23  import javax.el.ELException;
24  import javax.faces.FacesException;
25  import javax.faces.component.UIComponent;
26  import javax.faces.view.facelets.FaceletContext;
27  import javax.faces.view.facelets.FaceletException;
28  import javax.faces.view.facelets.TagAttribute;
29  import javax.faces.view.facelets.TagConfig;
30  import javax.faces.view.facelets.TagHandler;
31  
32  import org.apache.myfaces.custom.tree.HtmlTree;
33  import org.apache.myfaces.custom.tree.event.TreeSelectionListener;
34  import org.apache.myfaces.shared_tomahawk.util.ClassUtils;
35  
36  /**
37   * 
38   * @since 1.1.7
39   */
40  public class TreeSelectionListenerTagHandler extends TagHandler
41  {
42  
43      private final TagAttribute typeAttr;
44      
45      public TreeSelectionListenerTagHandler(TagConfig config)
46      {
47          super(config);
48          typeAttr = getRequiredAttribute("type");
49      }
50  
51      public void apply(FaceletContext faceletContext, UIComponent parent)
52              throws IOException, FacesException, FaceletException, ELException
53      {
54          if (parent.getParent() == null)
55          {
56              if (parent instanceof HtmlTree)
57              {
58                  String className;
59                  if (!typeAttr.isLiteral())
60                  {
61                      className = typeAttr.getValue();
62                  }
63                  else
64                  {
65                      className = typeAttr.getValue(faceletContext);
66                  }
67                  TreeSelectionListener listener = (TreeSelectionListener) ClassUtils.newInstance(className);
68                  ((HtmlTree) parent).addTreeSelectionListener(listener);
69              }
70              else
71              {
72                  throw new FacesException(
73                          "Component is not HtmlTree children");
74              }            
75          }
76      }
77  }