NestedMessagesPresentTag


1   /*
2    * $Id: NestedMessagesPresentTag.java 54929 2004-10-16 16:38:42Z germuska $ 
3    *
4    * Copyright 1999-2004 The Apache Software Foundation.
5    * 
6    * Licensed under the Apache License, Version 2.0 (the "License");
7    * you may not use this file except in compliance with the License.
8    * 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, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.struts.taglib.nested.logic;
19  
20  import javax.servlet.http.HttpServletRequest  ;
21  import javax.servlet.jsp.JspException  ;
22  
23  import org.apache.struts.taglib.logic.MessagesPresentTag;
24  import org.apache.struts.taglib.nested.NestedPropertySupport;
25  import org.apache.struts.taglib.nested.NestedPropertyHelper;
26  
27  /**
28   * NestedMessagesPresentTag.
29   *
30   * @since Struts 1.1
31   * @version $Rev: 54929 $ $Date: 2004-10-16 17:38:42 +0100 (Sat, 16 Oct 2004) $
32   */
33  public class NestedMessagesPresentTag extends MessagesPresentTag
34                                                    implements NestedPropertySupport  {
35  
36    /**
37     * Overriding method of the heart of the matter. Gets the relative property
38     * and leaves the rest up to the original tag implementation. Sweet.
39     * @return int JSP continuation directive.
40     *             This is in the hands of the super class.
41     */
42    public int doStartTag() throws JspException   {
43      // get the original properties
44      originalName = getName();
45      originalProperty = getProperty();
46  
47      // request
48      HttpServletRequest   request = (HttpServletRequest  )pageContext.getRequest();
49      // set the properties
50      NestedPropertyHelper.setNestedProperties(request, this);
51  
52      // let the super do it's thing
53      return super.doStartTag();
54    }
55  
56    /**
57     * Complete the processing of the tag. The nested tags here will restore
58     * all the original value for the tag itself and the nesting context.
59     * @return int to describe the next step for the JSP processor
60     * @throws JspException for the bad things JSP's do
61     */
62    public int doEndTag() throws JspException   {
63      // do the super's ending part
64      int i = super.doEndTag();
65  
66      // reset the properties
67      setName(originalName);
68      setProperty(originalProperty);
69  
70      // continue
71      return i;
72    }
73  
74    /**
75     * Release the tag's resources and reset the values.
76     */
77    public void release() {
78      super.release();
79      // reset the originals
80      originalName = null;
81      originalProperty = null;
82    }
83  
84    /* the usual private member variables */
85    private String   originalName = null;
86    private String   originalProperty = null;
87  }
88
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