/*
 * Copyright 2002-2004 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;

/**
 * Filter that restricts matching of a pointcut or introduction to
 * a given set of target classes.
 *
 * <p>Can be used as part of a pointcut, or for the entire targeting
 * of an IntroductionAdvice.
 *
 * @author Rod Johnson
 * @see org.springframework.aop.Pointcut
 */
public interface ClassFilter {
	
	/**
	 * 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
	 */
	boolean matches(Class clazz);


	/**
	 * Canonical instance of a ClassFilter that matches all classes.
	 */
	ClassFilter TRUE = TrueClassFilter.INSTANCE;

}
