/*
* Copyright 2002-2012 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.io.Serializable;
import java.lang.reflect.Method;
import org.springframework.aop.ClassFilter;
import org.springframework.aop.MethodMatcher;
import org.springframework.aop.Pointcut;
import org.springframework.core.ControlFlow;
import org.springframework.core.ControlFlowFactory;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
/**
* Pointcut and method matcher for use in simple <b>cflow</b>-style pointcut.
* Note that evaluating such pointcuts is 10-15 times slower than evaluating
* normal pointcuts, but they are useful in some cases.
*
* @author Rod Johnson
* @author Rob Harrop
* @see org.springframework.core.ControlFlow
*/
@SuppressWarnings("serial")
public class ControlFlowPointcut implements Pointcut, ClassFilter, MethodMatcher, Serializable {
private Class<?> clazz;
private String methodName;
private int evaluations;
/**
* Construct a new pointcut that matches all control flows below that class.
* @param clazz the clazz
*/
public ControlFlowPointcut(Class<?> clazz) {
this(clazz, null);
}
/**
* Construct a new pointcut that matches all calls below the
* given method in the given class. If the method name is null,
* matches all control flows below that class.
* @param clazz the clazz
* @param methodName the name of the method
*/
public ControlFlowPointcut(Class<?> clazz, String methodName) {
Assert.notNull(clazz, "Class must not be null");
this.clazz = clazz;
this.methodName = methodName;
}
/**
* Subclasses can override this for greater filtering (and performance).
*/
@Override
public boolean matches(Class<?> clazz) {
return true;
}
/**
* Subclasses can override this if it's possible to filter out
* some candidate classes.
*/
@Override
public boolean matches(Method method, Class<?> targetClass) {
return true;
}
@Override
public boolean isRuntime() {
return true;
}
@Override
public boolean matches(Method method, Class<?> targetClass, Object[] args) {
++this.evaluations;
ControlFlow cflow = ControlFlowFactory.createControlFlow();
return (this.methodName != null) ? cflow.under(this.clazz, this.methodName) : cflow.under(this.clazz);
}
/**
* It's useful to know how many times we've fired, for optimization.
*/
public int getEvaluations() {
return evaluations;
}
@Override
public ClassFilter getClassFilter() {
return this;
}
@Override
public MethodMatcher getMethodMatcher() {
return this;
}
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!(other instanceof ControlFlowPointcut)) {
return false;
}
ControlFlowPointcut that = (ControlFlowPointcut) other;
return (this.clazz.equals(that.clazz)) && ObjectUtils.nullSafeEquals(that.methodName, this.methodName);
}
@Override
public int hashCode() {
int code = 17;
code = 37 * code + this.clazz.hashCode();
if (this.methodName != null) {
code = 37 * code + this.methodName.hashCode();
}
return code;
}
}