org.springframework.beans.factory.support.LookupOverride Maven / Gradle / Ivy
/*
* 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
*
* 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.beans.factory.support;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import org.springframework.lang.Nullable;
import org.springframework.util.ObjectUtils;
/**
* Represents an override of a method that looks up an object in the same IoC context.
*
* Methods eligible for lookup override must not have arguments.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since 1.1
*/
public class LookupOverride extends MethodOverride {
@Nullable
private final String beanName;
@Nullable
private Method method;
/**
* Construct a new LookupOverride.
* @param methodName the name of the method to override
* @param beanName the name of the bean in the current {@code BeanFactory}
* that the overridden method should return (may be {@code null})
*/
public LookupOverride(String methodName, @Nullable String beanName) {
super(methodName);
this.beanName = beanName;
}
/**
* Construct a new LookupOverride.
* @param method the method to override
* @param beanName the name of the bean in the current {@code BeanFactory}
* that the overridden method should return (may be {@code null})
*/
public LookupOverride(Method method, @Nullable String beanName) {
super(method.getName());
this.method = method;
this.beanName = beanName;
}
/**
* Return the name of the bean that should be returned by this method.
*/
@Nullable
public String getBeanName() {
return this.beanName;
}
/**
* Match the specified method by {@link Method} reference or method name.
*
For backwards compatibility reasons, in a scenario with overloaded
* non-abstract methods of the given name, only the no-arg variant of a
* method will be turned into a container-driven lookup method.
*
In case of a provided {@link Method}, only straight matches will
* be considered, usually demarcated by the {@code @Lookup} annotation.
*/
@Override
public boolean matches(Method method) {
if (this.method != null) {
return method.equals(this.method);
}
else {
return (method.getName().equals(getMethodName()) && (!isOverloaded() ||
Modifier.isAbstract(method.getModifiers()) || method.getParameterCount() == 0));
}
}
@Override
public boolean equals(Object other) {
if (!(other instanceof LookupOverride) || !super.equals(other)) {
return false;
}
LookupOverride that = (LookupOverride) other;
return (ObjectUtils.nullSafeEquals(this.method, that.method) &&
ObjectUtils.nullSafeEquals(this.beanName, that.beanName));
}
@Override
public int hashCode() {
return (29 * super.hashCode() + ObjectUtils.nullSafeHashCode(this.beanName));
}
@Override
public String toString() {
return "LookupOverride for method '" + getMethodName() + "'";
}
}