| // Copyright 2004 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| 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 $Id$ |
| * @since 3.0 |
| * |
| **/ |
| |
| public class RegexpMatcher |
| { |
| private PatternCompiler _patternCompiler; |
| |
| private PatternMatcher _matcher; |
| |
| private Map _compiledPatterns = new HashMap(); |
| |
| private Map _escapedPatternStrings = 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(); |
| } |
| |
| protected PatternMatcher getPatternMatcher() |
| { |
| if (_matcher == null) |
| _matcher = new Perl5Matcher(); |
| |
| return _matcher; |
| } |
| |
| public boolean matches(String pattern, String input) |
| { |
| Pattern compiledPattern = getCompiledPattern(pattern); |
| |
| return getPatternMatcher().matches(input, compiledPattern); |
| } |
| |
| public boolean contains(String pattern, String input) |
| { |
| Pattern compiledPattern = getCompiledPattern(pattern); |
| |
| return getPatternMatcher().contains(input, compiledPattern); |
| } |
| |
| public String getEscapedPatternString(String pattern) |
| { |
| String result = (String) _escapedPatternStrings.get(pattern); |
| |
| if (result == null) |
| { |
| result = Perl5Compiler.quotemeta(pattern); |
| |
| _escapedPatternStrings.put(pattern, result); |
| } |
| |
| return result; |
| } |
| |
| } |