/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, 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://apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation", "Tapestry"
* must not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* or "Tapestry", nor may "Apache" or "Tapestry" appear in their
* name, without prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* DISCLAIMED. IN NO EVENT SHALL THE TAPESTRY CONTRIBUTOR COMMUNITY
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.tapestry.util;
import java.util.HashMap;
import java.util.Map;
import org.apache.oro.text.regex.MalformedPatternException;
import org.apache.oro.text.regex.Pattern;
import org.apache.oro.text.regex.PatternCompiler;
import org.apache.oro.text.regex.PatternMatcher;
import org.apache.oro.text.regex.Perl5Compiler;
import org.apache.oro.text.regex.Perl5Matcher;
import org.apache.tapestry.ApplicationRuntimeException;
/**
* Streamlines the interface to ORO by implicitly constructing the
* necessary compilers and matchers, and by
* caching compiled patterns.
*
* @author Howard Lewis Ship
* @version $Id: RegexpMatcher.java,v 1.2 2003/04/17 21:33:50 hlship Exp $
* @since 3.0
*
**/
public class RegexpMatcher
{
private PatternCompiler _patternCompiler;
private PatternMatcher _matcher;
private Map _compiledPatterns = new HashMap();
protected Pattern compilePattern(String pattern)
{
if (_patternCompiler == null)
_patternCompiler = new Perl5Compiler();
try
{
return _patternCompiler.compile(pattern, Perl5Compiler.SINGLELINE_MASK);
}
catch (MalformedPatternException ex)
{
throw new ApplicationRuntimeException(ex);
}
}
protected Pattern getCompiledPattern(String pattern)
{
Pattern result = (Pattern) _compiledPatterns.get(pattern);
if (result == null)
{
result = compilePattern(pattern);
_compiledPatterns.put(pattern, result);
}
return result;
}
/**
* Clears any previously compiled patterns.
*
**/
public void clear()
{
_compiledPatterns.clear();
}
public boolean matches(String pattern, String input)
{
Pattern compiledPattern = getCompiledPattern(pattern);
if (_matcher == null)
_matcher = new Perl5Matcher();
return _matcher.matches(input, compiledPattern);
}
}