1 /*
2 * $Id: HiddenTag.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.html;
22
23 import org.apache.struts.taglib.TagUtils;
24
25 import javax.servlet.jsp.JspException;
26
27 /**
28 * Custom tag for input fields of type "hidden".
29 *
30 * @version $Rev: 471754 $ $Date: 2004-10-16 12:38:42 -0400 (Sat, 16 Oct 2004)
31 * $
32 */
33 public class HiddenTag extends BaseFieldTag {
34 // ------------------------------------------------------------- Properties
35
36 /**
37 * Should the value of this field also be rendered to the response?
38 */
39 protected boolean write = false;
40
41 // ----------------------------------------------------------- Constructors
42
43 /**
44 * Construct a new instance of this tag.
45 */
46 public HiddenTag() {
47 super();
48 this.type = "hidden";
49 }
50
51 public boolean getWrite() {
52 return (this.write);
53 }
54
55 public void setWrite(boolean write) {
56 this.write = write;
57 }
58
59 // --------------------------------------------------------- Public Methods
60
61 /**
62 * Generate the required input tag, followed by the optional rendered
63 * text. Support for <code>write</code> property since Struts 1.1.
64 *
65 * @throws JspException if a JSP exception has occurred
66 */
67 public int doStartTag() throws JspException {
68 // Render the <html:input type="hidden"> tag as before
69 super.doStartTag();
70
71 // Is rendering the value separately requested?
72 if (!write) {
73 return (EVAL_BODY_TAG);
74 }
75
76 // Calculate the value to be rendered separately
77 // * @since Struts 1.1
78 String results = null;
79
80 if (value != null) {
81 results = TagUtils.getInstance().filter(value);
82 } else {
83 Object value =
84 TagUtils.getInstance().lookup(pageContext, name, property, null);
85
86 if (value == null) {
87 results = "";
88 } else {
89 results = TagUtils.getInstance().filter(value.toString());
90 }
91 }
92
93 TagUtils.getInstance().write(pageContext, results);
94
95 return (EVAL_BODY_TAG);
96 }
97
98 /**
99 * Release any acquired resources.
100 */
101 public void release() {
102 super.release();
103 write = false;
104 }
105 }