1 /* 2 * $Id: ELResourceTag.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.strutsel.taglib.bean; 22 23 import org.apache.struts.taglib.bean.ResourceTag; 24 import org.apache.strutsel.taglib.utils.EvalHelper; 25 26 import javax.servlet.jsp.JspException; 27 28 /** 29 * Define a scripting variable based on the contents of the specified web 30 * application resource. <p> This class is a subclass of the class 31 * <code>org.apache.struts.taglib.bean.ResourceTag</code> which provides most 32 * of the described functionality. This subclass allows all attribute values 33 * to be specified as expressions utilizing the JavaServer Pages Standard 34 * Library expression language. 35 * 36 * @version $Rev: 471754 $ 37 */ 38 public class ELResourceTag extends ResourceTag { 39 /** 40 * Instance variable mapped to "id" tag attribute. (Mapping set in 41 * associated BeanInfo class.) 42 */ 43 private String idExpr; 44 45 /** 46 * Instance variable mapped to "input" tag attribute. (Mapping set in 47 * associated BeanInfo class.) 48 */ 49 private String inputExpr; 50 51 /** 52 * Instance variable mapped to "name" tag attribute. (Mapping set in 53 * associated BeanInfo class.) 54 */ 55 private String nameExpr; 56 57 /** 58 * Getter method for "id" tag attribute. (Mapping set in associated 59 * BeanInfo class.) 60 */ 61 public String getIdExpr() { 62 return (idExpr); 63 } 64 65 /** 66 * Getter method for "input" tag attribute. (Mapping set in associated 67 * BeanInfo class.) 68 */ 69 public String getInputExpr() { 70 return (inputExpr); 71 } 72 73 /** 74 * Getter method for "name" tag attribute. (Mapping set in associated 75 * BeanInfo class.) 76 */ 77 public String getNameExpr() { 78 return (nameExpr); 79 } 80 81 /** 82 * Setter method for "id" tag attribute. (Mapping set in associated 83 * BeanInfo class.) 84 */ 85 public void setIdExpr(String idExpr) { 86 this.idExpr = idExpr; 87 } 88 89 /** 90 * Setter method for "input" tag attribute. (Mapping set in associated 91 * BeanInfo class.) 92 */ 93 public void setInputExpr(String inputExpr) { 94 this.inputExpr = inputExpr; 95 } 96 97 /** 98 * Setter method for "name" tag attribute. (Mapping set in associated 99 * BeanInfo class.) 100 */ 101 public void setNameExpr(String nameExpr) { 102 this.nameExpr = nameExpr; 103 } 104 105 /** 106 * Resets attribute values for tag reuse. 107 */ 108 public void release() { 109 super.release(); 110 setIdExpr(null); 111 setInputExpr(null); 112 setNameExpr(null); 113 } 114 115 /** 116 * Process the start tag. 117 * 118 * @throws JspException if a JSP exception has occurred 119 */ 120 public int doStartTag() throws JspException { 121 evaluateExpressions(); 122 123 return (super.doStartTag()); 124 } 125 126 /** 127 * Processes all attribute values which use the JSTL expression evaluation 128 * engine to determine their values. 129 * 130 * @throws JspException if a JSP exception has occurred 131 */ 132 private void evaluateExpressions() 133 throws JspException { 134 String string = null; 135 136 if ((string = 137 EvalHelper.evalString("id", getIdExpr(), this, pageContext)) != null) { 138 setId(string); 139 } 140 141 if ((string = 142 EvalHelper.evalString("input", getInputExpr(), this, pageContext)) != null) { 143 setInput(string); 144 } 145 146 if ((string = 147 EvalHelper.evalString("name", getNameExpr(), this, pageContext)) != null) { 148 setName(string); 149 } 150 } 151 }