/*
* Copyright 2002-2006 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.aspectj;
import org.aspectj.weaver.tools.PointcutParser;
import org.aspectj.weaver.tools.TypePatternMatcher;
import org.springframework.aop.ClassFilter;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* Spring AOP {@link ClassFilter} implementation using AspectJ type matching.
*
* @author Rod Johnson
* @since 2.0
*/
public class TypePatternClassFilter implements ClassFilter {
private String typePattern;
private TypePatternMatcher aspectJTypePatternMatcher;
/**
* Creates a new instance of the {@link TypePatternClassFilter} class.
* <p>This is the JavaBean constructor; be sure to set the
* {@link #setTypePattern(String) typePattern} property, else a
* no doubt fatal {@link IllegalStateException} will be thrown
* when the {@link #matches(Class)} method is first invoked.
*/
public TypePatternClassFilter() {
}
/**
* Create a fully configured {@link TypePatternClassFilter} using the
* given type pattern.
* @param typePattern the type pattern that AspectJ weaver should parse
* @throws IllegalArgumentException if the supplied <code>typePattern</code> is <code>null</code>
* or is recognized as invalid
*/
public TypePatternClassFilter(String typePattern) {
setTypePattern(typePattern);
}
/**
* Set the AspectJ type pattern to match.
* <p>Examples include:
* <code class="code">
* org.springframework.beans.*
* </code>
* This will match any class or interface in the given package.
* <code class="code">
* org.springframework.beans.ITestBean+
* </code>
* This will match the <code>ITestBean</code> interface and any class
* that implements it.
* <p>These conventions are established by AspectJ, not Spring AOP.
* @param typePattern the type pattern that AspectJ weaver should parse
* @throws IllegalArgumentException if the supplied <code>typePattern</code> is <code>null</code>
* or is recognized as invalid
*/
public void setTypePattern(String typePattern) {
Assert.notNull(typePattern);
this.typePattern = typePattern;
this.aspectJTypePatternMatcher =
PointcutParser.getPointcutParserSupportingAllPrimitivesAndUsingContextClassloaderForResolution().
parseTypePattern(replaceBooleanOperators(typePattern));
}
public String getTypePattern() {
return typePattern;
}
/**
* Should the pointcut apply to the given interface or target class?
* @param clazz candidate target class
* @return whether the advice should apply to this candidate target class
* @throws IllegalStateException if no {@link #setTypePattern(String)} has been set
*/
public boolean matches(Class clazz) {
if (this.aspectJTypePatternMatcher == null) {
throw new IllegalStateException("No 'typePattern' has been set via ctor/setter.");
}
return this.aspectJTypePatternMatcher.matches(clazz);
}
/**
* If a type pattern has been specified in XML, the user cannot
* write <code>and</code> as "&&" (though && will work).
* We also allow <code>and</code> between two sub-expressions.
* <p>This method converts back to <code>&&</code> for the AspectJ pointcut parser.
*/
private String replaceBooleanOperators(String pcExpr) {
pcExpr = StringUtils.replace(pcExpr," and "," && ");
pcExpr = StringUtils.replace(pcExpr, " or ", " || ");
pcExpr = StringUtils.replace(pcExpr, " not ", " ! ");
return pcExpr;
}
}
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