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1 /*** 2 * ==================================================================== 3 * 4 * The Apache Software License, Version 1.1 5 * 6 * Copyright (c) 1999-2002 The Apache Software Foundation. All rights 7 * reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The end-user documentation included with the redistribution, if 22 * any, must include the following acknowlegement: 23 * "This product includes software developed by the 24 * Apache Software Foundation (http://www.apache.org/)." 25 * Alternately, this acknowlegement may appear in the software itself, 26 * if and wherever such third-party acknowlegements normally appear. 27 * 28 * 4. The names "The Jakarta Project", "Commons", and "Apache Software 29 * Foundation" must not be used to endorse or promote products derived 30 * from this software without prior written permission. For written 31 * permission, please contact apache@apache.org. 32 * 33 * 5. Products derived from this software may not be called "Apache" 34 * nor may "Apache" appear in their names without prior written 35 * permission of the Apache Group. 36 * 37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This software consists of voluntary contributions made by many 52 * individuals on behalf of the Apache Software Foundation. For more 53 * information on the Apache Software Foundation, please see 54 * <http://www.apache.org/>;. 55 * 56 * $Id: AskTag.java,v 1.1 2002/07/13 00:49:45 smor Exp $ 57 */ 58 package org.apache.commons.jelly.tags.interaction; 59 60 import java.io.InputStreamReader; 61 import java.io.BufferedReader; 62 import java.io.IOException; 63 64 import org.apache.commons.jelly.TagSupport; 65 import org.apache.commons.jelly.XMLOutput; 66 67 /*** 68 * Jelly Tag that asks the user a question, and puts his answer into 69 * a variable, with the attribute "answer". 70 * This variable may be reused further as any other Jelly variable. 71 * @author <a href="mailto:smor@hasgard.net">Stéphane Mor</a> 72 */ 73 public class AskTag extends TagSupport 74 { 75 /*** The question to ask to the user */ 76 private String question; 77 78 /*** 79 * The variable in which we will stock the user's input. 80 * This defaults to "interact.answer". 81 */ 82 private String answer = "interact.answer"; 83 84 /*** The default value, if the user doesn't answer */ 85 private String defaultInput; 86 87 /*** The user's input */ 88 private String input = ""; 89 90 /*** The prompt to display before the user input */ 91 private String prompt = ">"; 92 93 /*** 94 * Sets the question to ask to the user. If a "default" attribute 95 * is present, it will appear inside []. 96 * @param question The question to ask to the user 97 */ 98 public void setQuestion(String question) 99 { 100 this.question = question; 101 } 102 103 /*** 104 * Sets the name of the variable that will hold the answer 105 * This defaults to "interact.answer". 106 * @param answer the name of the variable that will hold the answer 107 */ 108 public void setAnswer(String answer) 109 { 110 this.answer = answer; 111 } 112 113 /*** 114 * Sets the default answer to the question. 115 * If it is present, it will appear inside []. 116 * @param default the default answer to the question 117 */ 118 public void setDefault(String defaultInput) 119 { 120 this.defaultInput = defaultInput; 121 } 122 123 /*** 124 * Sets the prompt that will be displayed before the user's input. 125 * @param promt the prompt that will be displayed before the user's input. 126 */ 127 public void setPrompt(String prompt) 128 { 129 this.prompt = prompt; 130 } 131 132 133 /*** 134 * Perform functionality provided by the tag 135 * @param output the place to write output 136 */ 137 public void doTag(XMLOutput output) 138 { 139 if (question != null) 140 { 141 if (defaultInput != null) 142 { 143 System.out.println(question + " [" + defaultInput + "]"); 144 } 145 else 146 { 147 System.out.println(question); 148 } 149 // The prompt should be just before the user's input, 150 // but it doesn't work ... 151 //System.out.print(prompt + " "); 152 } 153 154 BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); 155 156 try { 157 input = br.readLine(); 158 if (defaultInput != null && input.trim().equals("")) 159 { 160 input = defaultInput; 161 } 162 } catch (IOException ioe) { 163 } 164 context.setVariable(answer, input); 165 } 166 }

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