/interpreter/tags/at2dist130208/src/edu/vub/util/regexp/UncheckedRE.java

  1/* gnu/regexp/UncheckedRE.java
  2   Copyright (C) 2001, 2004 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.
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 11GNU Classpath is distributed in the hope that it will be useful, but
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 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
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 1902110-1301 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.
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 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
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 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.regexp;
 39
 40/**
 41 * UncheckedRE is a subclass of RE that allows programmers an easier means
 42 * of programmatically precompiling regular expressions.  It is constructed
 43 * and used in exactly the same manner as an instance of the RE class; the
 44 * only difference is that its constructors do not throw REException.
 45 * Instead, if a syntax error is encountered during construction, a
 46 * RuntimeException will be thrown.
 47 * <P>
 48 * Note that this makes UncheckedRE dangerous if constructed with
 49 * dynamic data.  Do not use UncheckedRE unless you are completely sure
 50 * that all input being passed to it contains valid, well-formed 
 51 * regular expressions for the syntax specified.
 52 *
 53 * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
 54 * @see edu.vub.util.regexp.RE 
 55 * @since edu.vub.util.regexp 1.1.4
 56 */
 57
 58public final class UncheckedRE extends RE {
 59  /**
 60   * Constructs a regular expression pattern buffer without any compilation
 61   * flags set, and using the default syntax (RESyntax.RE_SYNTAX_PERL5).
 62   *
 63   * @param pattern A regular expression pattern, in the form of a String,
 64   *   StringBuffer or char[].  Other input types will be converted to
 65   *   strings using the toString() method.
 66   * @exception RuntimeException The input pattern could not be parsed.
 67   * @exception NullPointerException The pattern was null.
 68   */
 69  public UncheckedRE(Object pattern) {
 70      this(pattern,0,RESyntax.RE_SYNTAX_PERL5);
 71  }
 72
 73  /**
 74   * Constructs a regular expression pattern buffer using the specified
 75   * compilation flags and the default syntax (RESyntax.RE_SYNTAX_PERL5).
 76   *
 77   * @param pattern A regular expression pattern, in the form of a String,
 78   *   StringBuffer, or char[].  Other input types will be converted to
 79   *   strings using the toString() method.
 80   * @param cflags The logical OR of any combination of the compilation flags in the RE class.
 81   * @exception RuntimeException The input pattern could not be parsed.
 82   * @exception NullPointerException The pattern was null.
 83   */
 84  public UncheckedRE(Object pattern, int cflags) {
 85      this(pattern,cflags,RESyntax.RE_SYNTAX_PERL5);
 86  }
 87
 88  /**
 89   * Constructs a regular expression pattern buffer using the specified
 90   * compilation flags and regular expression syntax.
 91   *
 92   * @param pattern A regular expression pattern, in the form of a String,
 93   *   StringBuffer, or char[].  Other input types will be converted to
 94   *   strings using the toString() method.
 95   * @param cflags The logical OR of any combination of the compilation flags in the RE class.
 96   * @param syntax The type of regular expression syntax to use.
 97   * @exception RuntimeException The input pattern could not be parsed.
 98   * @exception NullPointerException The pattern was null.
 99   */
100  public UncheckedRE(Object pattern, int cflags, RESyntax syntax) {
101      try {
102	  initialize(pattern,cflags,syntax,0,0);
103      } catch (REException e) { 
104	  throw new RuntimeException(e.getMessage());
105      }
106  }
107}
108
109