src/java/org/apache/log4j/chainsaw/OroRegExpEvaluator.java

/*
 * ============================================================================
 *                   The Apache Software License, Version 1.1
 * ============================================================================
 *
 *    Copyright (C) 1999 The Apache Software Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of  source code must  retain the above copyright  notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The end-user documentation included with the redistribution, if any, must
 *    include  the following  acknowledgment:  "This product includes  software
 *    developed  by the  Apache Software Foundation  (http://www.apache.org/)."
 *    Alternately, this  acknowledgment may  appear in the software itself,  if
 *    and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "log4j" and  "Apache Software Foundation"  must not be used to
 *    endorse  or promote  products derived  from this  software without  prior
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 *    apache@apache.org.
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 *
 * This software  consists of voluntary contributions made  by many individuals
 * on  behalf of the Apache Software  Foundation.  For more  information on the
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package org.apache.log4j.chainsaw;

import org.apache.oro.text.regex.MalformedPatternException;
import org.apache.oro.text.regex.Pattern;
import org.apache.oro.text.regex.Perl5Compiler;
import org.apache.oro.text.regex.Perl5Matcher;

import java.io.IOException;


/**
 * ExpressionEvaluator that forwards on the the Jakarta ORO Reg Exp package
 * @author Scott Deboy <sdeboy@apache.org>
 *
 */
public class OroRegExpEvaluator implements ExpressionEvaluator {
  private Pattern pattern;
  private transient Perl5Compiler compiler = new Perl5Compiler();
  private transient Perl5Matcher matcher = new Perl5Matcher();

  public OroRegExpEvaluator(String regExp) {
    try {
      pattern = compiler.compile(regExp, Perl5Compiler.CASE_INSENSITIVE_MASK);
    } catch (MalformedPatternException e) {
    }
  }

  /**
   * @see org.apache.log4j.chainsaw.ExpressionEvaluator#match(String)
   */
  public boolean match(String input) {
    return (pattern !=null && matcher.matches(input, pattern));
  }

  private void readObject(java.io.ObjectInputStream in)
    throws IOException, ClassNotFoundException {
    pattern = (Pattern) in.readObject();
    compiler = new Perl5Compiler();
    matcher = new Perl5Matcher();
  }

  private void writeObject(java.io.ObjectOutputStream out)
    throws IOException {
    out.writeObject(pattern);
  }
}