1 /*
2 * $Id: NestedImgTag.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.ImgTag;
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 * NestedImgTag, renders the nested version of the <img> tag.
32 *
33 * @version $Rev: 471754 $
34 * @since Struts 1.1
35 */
36 public class NestedImgTag extends ImgTag implements NestedNameSupport {
37 /* the usual private member variables */
38 private String originalName = null;
39 private String originalProperty = null;
40
41 /**
42 * Overriding method of the heart of the matter. Gets the relative
43 * property and leaves the rest up to the original tag implementation.
44 * Sweet.
45 *
46 * @return int JSP continuation directive. This is in the hands of the
47 * super class.
48 */
49 public int doStartTag() throws JspException {
50 // get the original properties
51 originalName = getName();
52 originalProperty = getProperty();
53
54 // request
55 HttpServletRequest request =
56 (HttpServletRequest) pageContext.getRequest();
57
58 // set the properties
59 NestedPropertyHelper.setNestedProperties(request, this);
60
61 // let the super do it's thing
62 return super.doStartTag();
63 }
64
65 /**
66 * Complete the processing of the tag. The nested tags here will restore
67 * all the original value for the tag itself and the nesting context.
68 *
69 * @return int to describe the next step for the JSP processor
70 * @throws JspException for the bad things JSP's do
71 */
72 public int doEndTag() throws JspException {
73 // do the super's ending part
74 int i = super.doEndTag();
75
76 // reset the properties
77 setName(originalName);
78 setProperty(originalProperty);
79
80 // continue
81 return i;
82 }
83
84 /**
85 * Release the tag's resources and reset the values.
86 */
87 public void release() {
88 super.release();
89
90 // reset the originals
91 originalName = null;
92 originalProperty = null;
93 }
94 }