Spring MethodOverride

public abstract class MethodOverride implements BeanMetadataElement {

   /**
    * 方法名称
    */
   private final String methodName;

   /**
    * 是否重载
    */
   private boolean overloaded = true;

   /**
    * 源
    */
   @Nullable
   private Object source;
}

public abstract boolean matches(Method method);

@Nullable
private final String beanName;

@Nullable
private Method method;

	@Override
	public boolean matches(Method method) {
		if (this.method != null) {
			// 通过 equals 判断
			return method.equals(this.method);
		}
		else {
			// 1. method 名称是否相同
			// 2. 是否需要重载
			// 3. 是不是 ABSTRACT 方法
			// 4. 参数列表长度是否等于0
			return (method.getName().equals(getMethodName()) && (!isOverloaded() ||
					Modifier.isAbstract(method.getModifiers()) || method.getParameterCount() == 0));
		}
	}

/**
 * 实现 MethodReplacer 接口的bean name
 * @see MethodReplacer
 */
private final String methodReplacerBeanName;

/**
 * 标签 arg-type 数据
 */
private final List<String> typeIdentifiers = new LinkedList<>();

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	   xmlns="http://www.springframework.org/schema/beans"
	   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
	<bean id="apple" class="org.source.hot.spring.overview.ioc.bean.lookup.Apple">
		<replaced-method replacer="methodReplacerApple" name="hello" >
			<arg-type>String</arg-type>
		</replaced-method>

	</bean>

	<bean id="methodReplacerApple" class="org.source.hot.spring.overview.ioc.bean.lookup.MethodReplacerApple">

	</bean>

</beans>

public ReplaceOverride(String methodName, String methodReplacerBeanName) {
   super(methodName);
   Assert.notNull(methodName, "Method replacer bean name must not be null");
   this.methodReplacerBeanName = methodReplacerBeanName;
}

@Override
public boolean matches(Method method) {
   // 方法名称是否相同
   if (!method.getName().equals(getMethodName())) {
      return false;
   }
   // 是否重载
   if (!isOverloaded()) {
      // Not overloaded: don't worry about arg type matching...
      return true;
   }
   // If we get here, we need to insist on precise argument matching...
   // 类型标识数量是否和参数列表是否不相同
   if (this.typeIdentifiers.size() != method.getParameterCount()) {
      return false;
   }
   // 获取参数类型列表
   Class<?>[] parameterTypes = method.getParameterTypes();
   for (int i = 0; i < this.typeIdentifiers.size(); i++) {
      String identifier = this.typeIdentifiers.get(i);
      // 判断 方法参数的类型是否在类型标识列表中
      if (!parameterTypes[i].getName().contains(identifier)) {
         return false;
      }
   }
   return true;
}

	private final Set<MethodOverride> overrides = new CopyOnWriteArraySet<>();