spring AutowireCandidateQualifier 源码

spring AutowireCandidateQualifier 代码

文件路径：/spring-beans/src/main/java/org/springframework/beans/factory/support/AutowireCandidateQualifier.java

/*
 * Copyright 2002-2018 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.BeanMetadataAttributeAccessor;
import org.springframework.util.Assert;

/**
 * Qualifier for resolving autowire candidates. A bean definition that
 * includes one or more such qualifiers enables fine-grained matching
 * against annotations on a field or parameter to be autowired.
 *
 * @author Mark Fisher
 * @author Juergen Hoeller
 * @since 2.5
 * @see org.springframework.beans.factory.annotation.Qualifier
 */
@SuppressWarnings("serial")
public class AutowireCandidateQualifier extends BeanMetadataAttributeAccessor {

	/**
	 * The name of the key used to store the value.
	 */
	public static final String VALUE_KEY = "value";

	private final String typeName;


	/**
	 * Construct a qualifier to match against an annotation of the
	 * given type.
	 * @param type the annotation type
	 */
	public AutowireCandidateQualifier(Class<?> type) {
		this(type.getName());
	}

	/**
	 * Construct a qualifier to match against an annotation of the
	 * given type name.
	 * <p>The type name may match the fully-qualified class name of
	 * the annotation or the short class name (without the package).
	 * @param typeName the name of the annotation type
	 */
	public AutowireCandidateQualifier(String typeName) {
		Assert.notNull(typeName, "Type name must not be null");
		this.typeName = typeName;
	}

	/**
	 * Construct a qualifier to match against an annotation of the
	 * given type whose {@code value} attribute also matches
	 * the specified value.
	 * @param type the annotation type
	 * @param value the annotation value to match
	 */
	public AutowireCandidateQualifier(Class<?> type, Object value) {
		this(type.getName(), value);
	}

	/**
	 * Construct a qualifier to match against an annotation of the
	 * given type name whose {@code value} attribute also matches
	 * the specified value.
	 * <p>The type name may match the fully-qualified class name of
	 * the annotation or the short class name (without the package).
	 * @param typeName the name of the annotation type
	 * @param value the annotation value to match
	 */
	public AutowireCandidateQualifier(String typeName, Object value) {
		Assert.notNull(typeName, "Type name must not be null");
		this.typeName = typeName;
		setAttribute(VALUE_KEY, value);
	}


	/**
	 * Retrieve the type name. This value will be the same as the
	 * type name provided to the constructor or the fully-qualified
	 * class name if a Class instance was provided to the constructor.
	 */
	public String getTypeName() {
		return this.typeName;
	}

}

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