001/*
002 * Copyright 2002-2017 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.beans.factory.support;
018
019import org.springframework.beans.factory.config.BeanDefinitionHolder;
020import org.springframework.beans.factory.config.DependencyDescriptor;
021
022/**
023 * {@link AutowireCandidateResolver} implementation to use when no annotation
024 * support is available. This implementation checks the bean definition only.
025 *
026 * @author Mark Fisher
027 * @author Juergen Hoeller
028 * @since 2.5
029 */
030public class SimpleAutowireCandidateResolver implements AutowireCandidateResolver {
031
032        @Override
033        public boolean isAutowireCandidate(BeanDefinitionHolder bdHolder, DependencyDescriptor descriptor) {
034                return bdHolder.getBeanDefinition().isAutowireCandidate();
035        }
036
037        /**
038         * Determine whether the given descriptor is effectively required.
039         * <p>The default implementation checks {@link DependencyDescriptor#isRequired()}.
040         * @param descriptor the descriptor for the target method parameter or field
041         * @return whether the descriptor is marked as required or possibly indicating
042         * non-required status some other way (e.g. through a parameter annotation)
043         * @since 4.3.9
044         * @see DependencyDescriptor#isRequired()
045         */
046        public boolean isRequired(DependencyDescriptor descriptor) {
047                return descriptor.isRequired();
048        }
049
050        @Override
051        public Object getSuggestedValue(DependencyDescriptor descriptor) {
052                return null;
053        }
054
055        @Override
056        public Object getLazyResolutionProxyIfNecessary(DependencyDescriptor descriptor, String beanName) {
057                return null;
058        }
059
060}