spring-batch ClassifierCompositeItemWriterBuilder 源码
spring-batch ClassifierCompositeItemWriterBuilder 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/support/builder/ClassifierCompositeItemWriterBuilder.java
/*
* Copyright 2017-2019 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.batch.item.support.builder;
import org.springframework.batch.item.ItemWriter;
import org.springframework.batch.item.support.ClassifierCompositeItemWriter;
import org.springframework.classify.Classifier;
import org.springframework.util.Assert;
/**
* Creates a fully qualified ClassifierCompositeItemWriter.
*
* @author Glenn Renfro
* @author Mahmoud Ben Hassine
* @since 4.0
*/
public class ClassifierCompositeItemWriterBuilder<T> {
private Classifier<T, ItemWriter<? super T>> classifier;
/**
* Establish the classifier to be used for the selection of which {@link ItemWriter}
* to use.
* @param classifier the classifier to set
* @return this instance for method chaining
* @see org.springframework.batch.item.support.ClassifierCompositeItemWriter#setClassifier(Classifier)
*/
public ClassifierCompositeItemWriterBuilder<T> classifier(Classifier<T, ItemWriter<? super T>> classifier) {
this.classifier = classifier;
return this;
}
/**
* Returns a fully constructed {@link ClassifierCompositeItemWriter}.
* @return a new {@link ClassifierCompositeItemWriter}
*/
public ClassifierCompositeItemWriter<T> build() {
Assert.notNull(classifier, "A classifier is required.");
ClassifierCompositeItemWriter<T> writer = new ClassifierCompositeItemWriter<>();
writer.setClassifier(this.classifier);
return writer;
}
}
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