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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  package org.apache.myfaces.commons.exporter;
20  
21  import java.io.IOException;
22  
23  import javax.el.ELException;
24  import javax.el.ValueExpression;
25  import javax.faces.FacesException;
26  import javax.faces.component.ActionSource;
27  import javax.faces.component.UIComponent;
28  import javax.faces.view.facelets.ComponentHandler;
29  import javax.faces.view.facelets.FaceletContext;
30  import javax.faces.view.facelets.FaceletException;
31  import javax.faces.view.facelets.TagAttribute;
32  import javax.faces.view.facelets.TagConfig;
33  import javax.faces.view.facelets.TagHandler;
34  
35  /**
36   * The (FaceletsExporterActionListenerTag) is responsible for handling the 
37   * ExporterActionListener Tag in Facelets.
38   */
39  public class FaceletsExporterActionListenerTag extends TagHandler
40  {
41  
42      private final TagAttribute _for;
43  
44      private final TagAttribute _fileType;
45  
46      private final TagAttribute _fileName;
47  
48      public FaceletsExporterActionListenerTag(TagConfig tagConfig) 
49      {
50          super(tagConfig);
51          this._for = getRequiredAttribute(ExporterActionListener.FOR_KEY);
52          this._fileType = getRequiredAttribute(ExporterActionListener.FILE_TYPE_KEY);
53          this._fileName = getRequiredAttribute(ExporterActionListener.FILENAME_KEY);
54      }
55  
56      public void apply(FaceletContext faceletContext, UIComponent parent)
57              throws IOException, FacesException, FaceletException, ELException
58      {
59          if (ComponentHandler.isNew(parent))
60          {
61              ValueExpression forVE = _for.getValueExpression(faceletContext,
62                      Object.class);
63              ValueExpression fileTypeVE = _fileType.getValueExpression(
64                      faceletContext, Object.class);
65              ValueExpression fileNameVE = _fileName.getValueExpression(
66                      faceletContext, Object.class);
67  
68              ActionSource actionSource = (ActionSource) parent;
69              actionSource.addActionListener(new ExporterActionListener(
70                      (String) forVE.getValue(faceletContext),
71                      (String) fileTypeVE.getValue(faceletContext),
72                      (String) fileNameVE.getValue(faceletContext)));
73          }
74      }
75  }