1 /*
2 * $Id: NestedLinkTag.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.html;
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 import javax.servlet.http.HttpServletRequest;
28 import javax.servlet.jsp.JspException;
29
30 /**
31 * NestedLinkTag.
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 NestedLinkTag extends LinkTag implements NestedNameSupport {
38 /* hold original property */
39 private String origName = null;
40 private String origProperty = null;
41 private String origParamProperty = 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 origName = super.getName();
53 origProperty = super.getProperty();
54 origParamProperty = super.getParamProperty();
55
56 /* decide the incoming options. Always two there are */
57 boolean doProperty =
58 ((origProperty != null) && (origProperty.length() > 0));
59 boolean doParam =
60 ((origParamProperty != null) && (origParamProperty.length() > 0));
61
62 // request
63 HttpServletRequest request =
64 (HttpServletRequest) pageContext.getRequest();
65
66 boolean hasName =
67 ((getName() != null) && (getName().trim().length() > 0));
68 String currentName;
69
70 if (hasName) {
71 currentName = getName();
72 } else {
73 currentName = NestedPropertyHelper.getCurrentName(request, this);
74 }
75
76 // set the bean name
77 super.setName(currentName);
78
79 // set property details
80 if (doProperty && !hasName) {
81 super.setProperty(NestedPropertyHelper.getAdjustedProperty(
82 request, origProperty));
83 }
84
85 // do the param property details
86 if (doParam) {
87 super.setName(null);
88 super.setParamName(currentName);
89 super.setParamProperty(NestedPropertyHelper.getAdjustedProperty(
90 request, origParamProperty));
91 }
92
93 /* do the tag */
94 return super.doStartTag();
95 }
96
97 /**
98 * Complete the processing of the tag. The nested tags here will restore
99 * all the original value for the tag itself and the nesting context.
100 *
101 * @return int to describe the next step for the JSP processor
102 * @throws JspException for the bad things JSP's do
103 */
104 public int doEndTag() throws JspException {
105 // do the super's ending part
106 int i = super.doEndTag();
107
108 // reset the properties
109 setName(origName);
110 setProperty(origProperty);
111 setParamProperty(origParamProperty);
112
113 // continue
114 return i;
115 }
116
117 /**
118 * Release the tag's resources and reset the values.
119 */
120 public void release() {
121 super.release();
122
123 // reset the originals
124 origName = null;
125 origProperty = null;
126 origParamProperty = null;
127 }
128 }