NestedLinkTag


1   /*
2    * $Id: NestedLinkTag.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.html;
19  
20  import javax.servlet.http.HttpServletRequest  ;
21  import javax.servlet.jsp.JspException  ;
22  
23  import org.apache.struts.taglib.html.LinkTag;
24  import org.apache.struts.taglib.nested.NestedNameSupport;
25  import org.apache.struts.taglib.nested.NestedPropertyHelper;
26  
27  /**
28   * NestedLinkTag.
29   * @since Struts 1.1
30   * @version $Rev: 54929 $ $Date: 2004-10-16 17:38:42 +0100 (Sat, 16 Oct 2004) $
31   */
32  public class NestedLinkTag extends LinkTag implements NestedNameSupport {
33  
34    /**
35     * Overriding method of the heart of the matter. Gets the relative property
36     * and leaves the rest up to the original tag implementation. Sweet.
37     * @return int JSP continuation directive.
38     *             This is in the hands of the super class.
39     */
40    public int doStartTag() throws JspException   {
41      origName = super.getName();
42      origProperty = super.getProperty();
43      origParamProperty = super.getParamProperty();
44  
45      /* decide the incoming options. Always two there are */
46      boolean doProperty = (origProperty != null && origProperty.length() > 0);
47      boolean doParam = (origParamProperty != null && origParamProperty.length() > 0);
48  
49      // request
50      HttpServletRequest   request = (HttpServletRequest  )pageContext.getRequest();
51  
52      boolean hasName = (getName() != null && getName().trim().length() > 0);
53      String   currentName;
54      if (hasName) {
55        currentName = getName();
56      } else {
57        currentName = NestedPropertyHelper.getCurrentName(request, this);
58      }
59      // set the bean name
60      super.setName(currentName);
61  
62      // set property details
63      if (doProperty && !hasName) {
64        super.setProperty(NestedPropertyHelper.getAdjustedProperty(request, origProperty));
65      }
66      // do the param property details
67      if (doParam) {
68        super.setName(null);
69        super.setParamName(currentName);
70        super.setParamProperty(NestedPropertyHelper.getAdjustedProperty(request, origParamProperty));
71      }
72      
73      /* do the tag */
74      return super.doStartTag();
75    }
76  
77    /**
78     * Complete the processing of the tag. The nested tags here will restore
79     * all the original value for the tag itself and the nesting context.
80     * @return int to describe the next step for the JSP processor
81     * @throws JspException for the bad things JSP's do
82     */
83    public int doEndTag() throws JspException   {
84      // do the super's ending part
85      int i = super.doEndTag();
86  
87      // reset the properties
88      setName(origName);
89      setProperty(origProperty);
90      setParamProperty(origParamProperty);
91  
92      // continue
93      return i;
94    }
95  
96    /**
97     * Release the tag's resources and reset the values.
98     */
99    public void release() {
100     super.release();
101     // reset the originals
102     origName = null;
103     origProperty = null;
104     origParamProperty = null;
105   }
106 
107 
108   /* hold original property */
109   private String   origName = null;
110   private String   origProperty = null;
111   private String   origParamProperty = null;
112 }
113
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags