spring SimpleAutowireCandidateResolver 源码
spring SimpleAutowireCandidateResolver 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/factory/support/SimpleAutowireCandidateResolver.java
/*
* Copyright 2002-2020 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.beans.factory.support;
import org.springframework.beans.factory.config.BeanDefinitionHolder;
import org.springframework.beans.factory.config.DependencyDescriptor;
import org.springframework.lang.Nullable;
/**
* {@link AutowireCandidateResolver} implementation to use when no annotation
* support is available. This implementation checks the bean definition only.
*
* @author Mark Fisher
* @author Juergen Hoeller
* @since 2.5
*/
public class SimpleAutowireCandidateResolver implements AutowireCandidateResolver {
/**
* Shared instance of {@code SimpleAutowireCandidateResolver}.
* @since 5.2.7
*/
public static final SimpleAutowireCandidateResolver INSTANCE = new SimpleAutowireCandidateResolver();
@Override
public boolean isAutowireCandidate(BeanDefinitionHolder bdHolder, DependencyDescriptor descriptor) {
return bdHolder.getBeanDefinition().isAutowireCandidate();
}
@Override
public boolean isRequired(DependencyDescriptor descriptor) {
return descriptor.isRequired();
}
@Override
public boolean hasQualifier(DependencyDescriptor descriptor) {
return false;
}
@Override
@Nullable
public Object getSuggestedValue(DependencyDescriptor descriptor) {
return null;
}
@Override
@Nullable
public Object getLazyResolutionProxyIfNecessary(DependencyDescriptor descriptor, @Nullable String beanName) {
return null;
}
/**
* This implementation returns {@code this} as-is.
* @see #INSTANCE
*/
@Override
public AutowireCandidateResolver cloneIfNecessary() {
return this;
}
}
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