spring NullSourceExtractor 源码
spring NullSourceExtractor 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/factory/parsing/NullSourceExtractor.java
/*
* Copyright 2002-2012 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.parsing;
import org.springframework.core.io.Resource;
import org.springframework.lang.Nullable;
/**
* Simple implementation of {@link SourceExtractor} that returns {@code null}
* as the source metadata.
*
* <p>This is the default implementation and prevents too much metadata from being
* held in memory during normal (non-tooled) runtime usage.
*
* @author Rob Harrop
* @since 2.0
*/
public class NullSourceExtractor implements SourceExtractor {
/**
* This implementation simply returns {@code null} for any input.
*/
@Override
@Nullable
public Object extractSource(Object sourceCandidate, @Nullable Resource definitionResource) {
return null;
}
}
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