/*
* Copyright 2002-2009 the original author or authors.
*
* 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.springframework.aop.support;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
/**
* Regular expression pointcut based on the <code>java.util.regex</code> package.
* Supports the following JavaBean properties:
* <ul>
* <li>pattern: regular expression for the fully-qualified method names to match
* <li>patterns: alternative property taking a String array of patterns. The result will
* be the union of these patterns.
* </ul>
*
* <p>Note: the regular expressions must be a match. For example,
* <code>.*get.*</code> will match com.mycom.Foo.getBar().
* <code>get.*</code> will not.
*
* @author Dmitriy Kopylenko
* @author Rob Harrop
* @since 1.1
*/
public class JdkRegexpMethodPointcut extends AbstractRegexpMethodPointcut {
/**
* Compiled form of the patterns.
*/
private Pattern[] compiledPatterns = new Pattern[0];
/**
* Compiled form of the exclusion patterns.
*/
private Pattern[] compiledExclusionPatterns = new Pattern[0];
/**
* Initialize {@link Pattern Patterns} from the supplied <code>String[]</code>.
*/
@Override
protected void initPatternRepresentation(String[] patterns) throws PatternSyntaxException {
this.compiledPatterns = compilePatterns(patterns);
}
/**
* Initialize exclusion {@link Pattern Patterns} from the supplied <code>String[]</code>.
*/
@Override
protected void initExcludedPatternRepresentation(String[] excludedPatterns) throws PatternSyntaxException {
this.compiledExclusionPatterns = compilePatterns(excludedPatterns);
}
/**
* Returns <code>true</code> if the {@link Pattern} at index <code>patternIndex</code>
* matches the supplied candidate <code>String</code>.
*/
@Override
protected boolean matches(String pattern, int patternIndex) {
Matcher matcher = this.compiledPatterns[patternIndex].matcher(pattern);
return matcher.matches();
}
/**
* Returns <code>true</code> if the exclusion {@link Pattern} at index <code>patternIndex</code>
* matches the supplied candidate <code>String</code>.
*/
@Override
protected boolean matchesExclusion(String candidate, int patternIndex) {
Matcher matcher = this.compiledExclusionPatterns[patternIndex].matcher(candidate);
return matcher.matches();
}
/**
* Compiles the supplied <code>String[]</code> into an array of
* {@link Pattern} objects and returns that array.
*/
private Pattern[] compilePatterns(String[] source) throws PatternSyntaxException {
Pattern[] destination = new Pattern[source.length];
for (int i = 0; i < source.length; i++) {
destination[i] = Pattern.compile(source[i]);
}
return destination;
}
}
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