spring MethodLocatingFactoryBean 源码
spring MethodLocatingFactoryBean 代码
文件路径：/spring-aop/src/main/java/org/springframework/aop/config/MethodLocatingFactoryBean.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.config;
import java.lang.reflect.Method;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.lang.Nullable;
import org.springframework.util.StringUtils;
/**
* {@link FactoryBean} implementation that locates a {@link Method} on a specified bean.
*
* @author Rob Harrop
* @since 2.0
*/
public class MethodLocatingFactoryBean implements FactoryBean<Method>, BeanFactoryAware {
@Nullable
private String targetBeanName;
@Nullable
private String methodName;
@Nullable
private Method method;
/**
* Set the name of the bean to locate the {@link Method} on.
* <p>This property is required.
* @param targetBeanName the name of the bean to locate the {@link Method} on
*/
public void setTargetBeanName(String targetBeanName) {
this.targetBeanName = targetBeanName;
}
/**
* Set the name of the {@link Method} to locate.
* <p>This property is required.
* @param methodName the name of the {@link Method} to locate
*/
public void setMethodName(String methodName) {
this.methodName = methodName;
}
@Override
public void setBeanFactory(BeanFactory beanFactory) {
if (!StringUtils.hasText(this.targetBeanName)) {
throw new IllegalArgumentException("Property 'targetBeanName' is required");
}
if (!StringUtils.hasText(this.methodName)) {
throw new IllegalArgumentException("Property 'methodName' is required");
}
Class<?> beanClass = beanFactory.getType(this.targetBeanName);
if (beanClass == null) {
throw new IllegalArgumentException("Can't determine type of bean with name '" + this.targetBeanName + "'");
}
this.method = BeanUtils.resolveSignature(this.methodName, beanClass);
if (this.method == null) {
throw new IllegalArgumentException("Unable to locate method [" + this.methodName +
"] on bean [" + this.targetBeanName + "]");
}
}
@Override
@Nullable
public Method getObject() throws Exception {
return this.method;
}
@Override
public Class<Method> getObjectType() {
return Method.class;
}
@Override
public boolean isSingleton() {
return true;
}
}
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