spring AbstractExpressionPointcut 源码
spring AbstractExpressionPointcut 代码
文件路径：/spring-aop/src/main/java/org/springframework/aop/support/AbstractExpressionPointcut.java
/*
* Copyright 2002-2017 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
*
* https://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 org.springframework.lang.Nullable;
/**
* Abstract superclass for expression pointcuts,
* offering location and expression properties.
*
* @author Rod Johnson
* @author Rob Harrop
* @since 2.0
* @see #setLocation
* @see #setExpression
*/
@SuppressWarnings("serial")
public abstract class AbstractExpressionPointcut implements ExpressionPointcut, Serializable {
@Nullable
private String location;
@Nullable
private String expression;
/**
* Set the location for debugging.
*/
public void setLocation(@Nullable String location) {
this.location = location;
}
/**
* Return location information about the pointcut expression
* if available. This is useful in debugging.
* @return location information as a human-readable String,
* or {@code null} if none is available
*/
@Nullable
public String getLocation() {
return this.location;
}
public void setExpression(@Nullable String expression) {
this.expression = expression;
try {
onSetExpression(expression);
}
catch (IllegalArgumentException ex) {
// Fill in location information if possible.
if (this.location != null) {
throw new IllegalArgumentException("Invalid expression at location [" + this.location + "]: " + ex);
}
else {
throw ex;
}
}
}
/**
* Called when a new pointcut expression is set.
* The expression should be parsed at this point if possible.
* <p>This implementation is empty.
* @param expression the expression to set
* @throws IllegalArgumentException if the expression is invalid
* @see #setExpression
*/
protected void onSetExpression(@Nullable String expression) throws IllegalArgumentException {
}
/**
* Return this pointcut's expression.
*/
@Override
@Nullable
public String getExpression() {
return this.expression;
}
}
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