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1   /*
2    * $Id: NestedMessagesPresentTag.java 471754 2006-11-06 14:55:09Z husted $
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *  http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  package org.apache.struts.taglib.nested.logic;
22  
23  import org.apache.struts.taglib.logic.MessagesPresentTag;
24  import org.apache.struts.taglib.nested.NestedPropertyHelper;
25  import org.apache.struts.taglib.nested.NestedPropertySupport;
26  
27  import javax.servlet.http.HttpServletRequest;
28  import javax.servlet.jsp.JspException;
29  
30  /**
31   * NestedMessagesPresentTag.
32   *
33   * @version $Rev: 471754 $ $Date: 2004-10-16 12:38:42 -0400 (Sat, 16 Oct 2004)
34   *          $
35   * @since Struts 1.1
36   */
37  public class NestedMessagesPresentTag extends MessagesPresentTag
38      implements NestedPropertySupport {
39      /* the usual private member variables */
40      private String originalName = null;
41      private String originalProperty = null;
42  
43      /**
44       * Overriding method of the heart of the matter. Gets the relative
45       * property and leaves the rest up to the original tag implementation.
46       * Sweet.
47       *
48       * @return int JSP continuation directive. This is in the hands of the
49       *         super class.
50       */
51      public int doStartTag() throws JspException {
52          // get the original properties
53          originalName = getName();
54          originalProperty = getProperty();
55  
56          // request
57          HttpServletRequest request =
58              (HttpServletRequest) pageContext.getRequest();
59  
60          // set the properties
61          NestedPropertyHelper.setNestedProperties(request, this);
62  
63          // let the super do it's thing
64          return super.doStartTag();
65      }
66  
67      /**
68       * Complete the processing of the tag. The nested tags here will restore
69       * all the original value for the tag itself and the nesting context.
70       *
71       * @return int to describe the next step for the JSP processor
72       * @throws JspException for the bad things JSP's do
73       */
74      public int doEndTag() throws JspException {
75          // do the super's ending part
76          int i = super.doEndTag();
77  
78          // reset the properties
79          setName(originalName);
80          setProperty(originalProperty);
81  
82          // continue
83          return i;
84      }
85  
86      /**
87       * Release the tag's resources and reset the values.
88       */
89      public void release() {
90          super.release();
91  
92          // reset the originals
93          originalName = null;
94          originalProperty = null;
95      }
96  }