/interpreter/tags/at2-build190607/src/edu/vub/util/PatternSyntaxException.java
Java | 132 lines | 46 code | 11 blank | 75 comment | 3 complexity | db587684200f990a9b53b6c345f7a552 MD5 | raw file
1/* PatternSyntaxException - Indicates illegal pattern for regular expression. 2Copyright (C) 2002 Free Software Foundation, Inc. 3 4This file is part of GNU Classpath. 5 6GNU Classpath is free software; you can redistribute it and/or modify 7it under the terms of the GNU General Public License as published by 8the Free Software Foundation; either version 2, or (at your option) 9any later version. 10 11GNU Classpath is distributed in the hope that it will be useful, but 12WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14General Public License for more details. 15 16You should have received a copy of the GNU General Public License 17along with GNU Classpath; see the file COPYING. If not, write to the 18Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 1902111-1307 USA. 20 21Linking this library statically or dynamically with other modules is 22making a combined work based on this library. Thus, the terms and 23conditions of the GNU General Public License cover the whole 24combination. 25 26As a special exception, the copyright holders of this library give you 27permission to link this library with independent modules to produce an 28executable, regardless of the license terms of these independent 29modules, and to copy and distribute the resulting executable under 30terms of your choice, provided that you also meet, for each linked 31independent module, the terms and conditions of the license of that 32module. An independent module is a module which is not derived from 33or based on this library. If you modify this library, you may extend 34this exception to your version of the library, but you are not 35obligated to do so. If you do not wish to do so, delete this 36exception statement from your version. */ 37 38package edu.vub.util; 39 40/** 41 * Indicates illegal pattern for regular expression. 42 * Includes state to inspect the pattern and what and where the expression 43 * was not valid regular expression. 44 */ 45public class PatternSyntaxException extends IllegalArgumentException 46{ 47 private static final long serialVersionUID = -3864639126226059218L; 48 49 /** 50 * Human readable escription of the syntax error. 51 */ 52 private final String desc; 53 54 /** 55 * The original pattern that contained the syntax error. 56 */ 57 private final String pattern; 58 59 /** 60 * Index of the first character in the String that was probably invalid, 61 * or -1 when unknown. 62 */ 63 private final int index; 64 65 /** 66 * Creates a new PatternSyntaxException. 67 * 68 * @param description Human readable escription of the syntax error. 69 * @param pattern The original pattern that contained the syntax error. 70 * @param index Index of the first character in the String that was 71 * probably invalid, or -1 when unknown. 72 */ 73 public PatternSyntaxException(String description, 74 String pattern, 75 int index) 76 { 77 super(description); 78 this.desc = description; 79 this.pattern = pattern; 80 this.index = index; 81 } 82 83 /** 84 * Returns a human readable escription of the syntax error. 85 */ 86 public String getDescription() 87 { 88 return desc; 89 } 90 91 /** 92 * Returns the original pattern that contained the syntax error. 93 */ 94 public String getPattern() 95 { 96 return pattern; 97 } 98 99 /** 100 * Returns the index of the first character in the String that was probably 101 * invalid, or -1 when unknown. 102 */ 103 public int getIndex() 104 { 105 return index; 106 } 107 108 /** 109 * Returns a string containing a line with the description, a line with 110 * the original pattern and a line indicating with a ^ which character is 111 * probably the first invalid character in the pattern if the index is not 112 * negative. 113 */ 114 public String getMessage() 115 { 116 String lineSep = System.getProperty("line.separator"); 117 StringBuffer sb = new StringBuffer(desc); 118 sb.append(lineSep); 119 sb.append('\t'); 120 sb.append(pattern); 121 if (index != -1) 122 { 123 sb.append(lineSep); 124 sb.append('\t'); 125 for (int i=0; i<index; i++) 126 sb.append(' '); 127 sb.append('^'); 128 } 129 return sb.toString(); 130 } 131 132}