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 }