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

   1 /* gnu/regexp/UncheckedRE.java
   2    Copyright (C) 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 /**
  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 gnu.java.util.regex.RE
  55  * @since gnu.regexp 1.1.4
  56  */
  57
  58 public final class UncheckedRE extends RE
  59 {
  60   /**
  61    * Constructs a regular expression pattern buffer without any compilation
  62    * flags set, and using the default syntax (RESyntax.RE_SYNTAX_PERL5).
  63    *
  64    * @param pattern A regular expression pattern, in the form of a String,
  65    *   StringBuffer or char[].  Other input types will be converted to
  66    *   strings using the toString() method.
  67    * @exception RuntimeException The input pattern could not be parsed.
  68    * @exception NullPointerException The pattern was null.
  69    */
  70   public UncheckedRE (Object pattern)
  71   {
  72     this (pattern, 0, RESyntax.RE_SYNTAX_PERL5);
  73   }
  74
  75   /**
  76    * Constructs a regular expression pattern buffer using the specified
  77    * compilation flags and the default syntax (RESyntax.RE_SYNTAX_PERL5).
  78    *
  79    * @param pattern A regular expression pattern, in the form of a String,
  80    *   StringBuffer, or char[].  Other input types will be converted to
  81    *   strings using the toString() method.
  82    * @param cflags The logical OR of any combination of the compilation flags in the RE class.
  83    * @exception RuntimeException The input pattern could not be parsed.
  84    * @exception NullPointerException The pattern was null.
  85    */
  86   public UncheckedRE (Object pattern, int cflags)
  87   {
  88     this (pattern, cflags, RESyntax.RE_SYNTAX_PERL5);
  89   }
  90
  91   /**
  92    * Constructs a regular expression pattern buffer using the specified
  93    * compilation flags and regular expression syntax.
  94    *
  95    * @param pattern A regular expression pattern, in the form of a String,
  96    *   StringBuffer, or char[].  Other input types will be converted to
  97    *   strings using the toString() method.
  98    * @param cflags The logical OR of any combination of the compilation flags in the RE class.
  99    * @param syntax The type of regular expression syntax to use.
 100    * @exception RuntimeException The input pattern could not be parsed.
 101    * @exception NullPointerException The pattern was null.
 102    */
 103   public UncheckedRE (Object pattern, int cflags, RESyntax syntax)
 104   {
 105     try
 106     {
 107       initialize (pattern, cflags, syntax, 0, 0);
 108     }
 109     catch (REException e)
 110     {
 111       throw new RuntimeException (e.getMessage ());
 112     }
 113   }
 114 }