spring ValueExtractor 源码
spring ValueExtractor 代码
文件路径：/spring-core/src/main/java/org/springframework/core/annotation/ValueExtractor.java
/*
* Copyright 2002-2021 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.core.annotation;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Map;
import org.springframework.lang.Nullable;
/**
* Strategy API for extracting a value for an annotation attribute from a given
* source object which is typically an {@link Annotation}, {@link Map}, or
* {@link TypeMappedAnnotation}.
*
* @author Sam Brannen
* @since 5.2.4
*/
@FunctionalInterface
interface ValueExtractor {
/**
* Extract the annotation attribute represented by the supplied {@link Method}
* from the supplied source {@link Object}.
*/
@Nullable
Object extract(Method attribute, @Nullable Object object);
}
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