uncheckedre.java

用java 编写的源码开放的文本编辑器。有很多有用的特性

/*
 *  gnu/regexp/UncheckedRE.java
 *  Copyright (C) 2001 Wes Biggs
 *
 *  This library is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published
 *  by the Free Software Foundation; either version 2.1 of the License, or
 *  (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package gnu.regexp;

/**
 * UncheckedRE is a subclass of RE that allows programmers an easier means
 * of programmatically precompiling regular expressions.  It is constructed
 * and used in exactly the same manner as an instance of the RE class; the
 * only difference is that its constructors do not throw REException.
 * Instead, if a syntax error is encountered during construction, a
 * RuntimeException will be thrown.
 * <P>
 * Note that this makes UncheckedRE dangerous if constructed with
 * dynamic data.  Do not use UncheckedRE unless you are completely sure
 * that all input being passed to it contains valid, well-formed 
 * regular expressions for the syntax specified.
 *
 * @author <A HREF="mailto:[e-mail]">Wes Biggs</A>
 * @see gnu.regexp.RE 
 * @since gnu.regexp 1.1.4
 */

public final class UncheckedRE extends RE {
  /**
   * Constructs a regular expression pattern buffer without any compilation
   * flags set, and using the default syntax (RESyntax.RE_SYNTAX_PERL5).
   *
   * @param pattern A regular expression pattern, in the form of a String,
   *   StringBuffer or char[].  Other input types will be converted to
   *   strings using the toString() method.
   * @exception RuntimeException The input pattern could not be parsed.
   * @exception NullPointerException The pattern was null.
   */
  public UncheckedRE(Object pattern) {
      this(pattern,0,RESyntax.RE_SYNTAX_PERL5);
  }

  /**
   * Constructs a regular expression pattern buffer using the specified
   * compilation flags and the default syntax (RESyntax.RE_SYNTAX_PERL5).
   *
   * @param pattern A regular expression pattern, in the form of a String,
   *   StringBuffer, or char[].  Other input types will be converted to
   *   strings using the toString() method.
   * @param cflags The logical OR of any combination of the compilation flags in the RE class.
   * @exception RuntimeException The input pattern could not be parsed.
   * @exception NullPointerException The pattern was null.
   */
  public UncheckedRE(Object pattern, int cflags) {
      this(pattern,cflags,RESyntax.RE_SYNTAX_PERL5);
  }

  /**
   * Constructs a regular expression pattern buffer using the specified
   * compilation flags and regular expression syntax.
   *
   * @param pattern A regular expression pattern, in the form of a String,
   *   StringBuffer, or char[].  Other input types will be converted to
   *   strings using the toString() method.
   * @param cflags The logical OR of any combination of the compilation flags in the RE class.
   * @param syntax The type of regular expression syntax to use.
   * @exception RuntimeException The input pattern could not be parsed.
   * @exception NullPointerException The pattern was null.
   */
  public UncheckedRE(Object pattern, int cflags, RESyntax syntax) {
      try {
	  initialize(pattern,cflags,syntax,0,0);
      } catch (REException e) { 
	  throw new RuntimeException(e.getMessage());
      }
  }
}