libjava/classpath/gnu/java/util/regex/REException.java

   1 /* gnu/regexp/REException.java
   2    Copyright (C) 1998-2001, 2004 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 package gnu.java.util.regex;
  39
  40 import gnu.java.lang.CPStringBuilder;
  41
  42 import java.text.MessageFormat;
  43
  44 /**
  45  * This is the regular expression exception class.  An exception of this type
  46  * defines the three attributes:
  47  * <OL>
  48  * <LI> A descriptive message of the error.
  49  * <LI> An integral type code equivalent to one of the statically
  50  *      defined symbols listed below.
  51  * <LI> The approximate position in the input string where the error
  52  *      occurred.
  53  * </OL>
  54  *
  55  * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
  56  */
  57
  58 public class REException extends Exception
  59 {
  60   private int type;
  61   private int pos;
  62
  63   // Error conditions from GNU regcomp(3) manual
  64
  65   /**
  66    * Error flag.
  67    * Invalid use of repetition operators such  as  using
  68    * `*' as the first character.
  69    */
  70   public static final int REG_BADRPT = 1;
  71
  72   /**
  73    * Error flag.
  74    * Invalid use of back reference operator.
  75    */
  76   public static final int REG_BADBR = 2;
  77
  78   /**
  79    * Error flag.
  80    * Un-matched brace interval operators.
  81    */
  82   public static final int REG_EBRACE = 3;
  83
  84   /**
  85    * Error flag.
  86    * Un-matched bracket list operators.
  87    */
  88   public static final int REG_EBRACK = 4;
  89
  90   /**
  91    * Error flag.
  92    * Invalid  use  of the range operator, eg. the ending
  93    * point of the range occurs  prior  to  the  starting
  94    * point.
  95    */
  96   public static final int REG_ERANGE = 5;
  97
  98   /**
  99    * Error flag.
 100    * Unknown character class name. <B>Not implemented</B>.
 101    */
 102   public static final int REG_ECTYPE = 6;
 103
 104   /**
 105    * Error flag.
 106    * Un-matched parenthesis group operators.
 107    */
 108   public static final int REG_EPAREN = 7;
 109
 110   /**
 111    * Error flag.
 112    * Invalid back reference to a subexpression.
 113    */
 114   public static final int REG_ESUBREG = 8;
 115
 116   /**
 117    * Error flag.
 118    * Non specific error. <B>Not implemented</B>.
 119    */
 120   public static final int REG_EEND = 9;
 121
 122   /**
 123    * Error flag.
 124    * Invalid escape sequence. <B>Not implemented</B>.
 125    */
 126   public static final int REG_ESCAPE = 10;
 127
 128   /**
 129    * Error flag.
 130    * Invalid  use  of pattern operators such as group or list.
 131    */
 132   public static final int REG_BADPAT = 11;
 133
 134   /**
 135    * Error flag.
 136    * Compiled  regular  expression  requires  a  pattern
 137    * buffer larger than 64Kb. <B>Not implemented</B>.
 138    */
 139   public static final int REG_ESIZE = 12;
 140
 141   /**
 142    * Error flag.
 143    * The regex routines ran out of memory. <B>Not implemented</B>.
 144    */
 145   public static final int REG_ESPACE = 13;
 146
 147     REException (String msg, int type, int position)
 148   {
 149     super (msg);
 150     this.type = type;
 151     this.pos = position;
 152   }
 153
 154   REException (String msg, Throwable cause, int type, int position)
 155   {
 156     super (msg, cause);
 157     this.type = type;
 158     this.pos = position;
 159   }
 160
 161   /**
 162    * Returns the type of the exception, one of the constants listed above.
 163    */
 164
 165   public int getType ()
 166   {
 167     return type;
 168   }
 169
 170   /**
 171    * Returns the position, relative to the string or character array being
 172    * compiled, where the error occurred.  This position is generally the point
 173    * where the error was detected, not necessarily the starting index of
 174    * a bad subexpression.
 175    */
 176   public int getPosition ()
 177   {
 178     return pos;
 179   }
 180
 181   /**
 182    * Reports the descriptive message associated with this exception
 183    * as well as its index position in the string or character array
 184    * being compiled.
 185    */
 186   public String getMessage ()
 187   {
 188     Object[]args =
 189     {
 190     new Integer (pos)};
 191     CPStringBuilder sb = new CPStringBuilder ();
 192     String prefix = RE.getLocalizedMessage ("error.prefix");
 193     sb.append (MessageFormat.format (prefix, args));
 194     sb.append ('\n');
 195     sb.append (super.getMessage ());
 196     return sb.toString ();
 197   }
 198 }