spring-batch ClassifierCompositeItemWriter 源码
spring-batch ClassifierCompositeItemWriter 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/support/ClassifierCompositeItemWriter.java
/*
* Copyright 2006-2007 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;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.springframework.classify.Classifier;
import org.springframework.classify.ClassifierSupport;
import org.springframework.batch.item.ItemWriter;
import org.springframework.util.Assert;
/**
* Calls one of a collection of ItemWriters for each item, based on a router pattern
* implemented through the provided {@link Classifier}.
*
* The implementation is thread-safe if all delegates are thread-safe.
*
* @author Dave Syer
* @author Glenn Renfro
* @since 2.0
*/
public class ClassifierCompositeItemWriter<T> implements ItemWriter<T> {
private Classifier<T, ItemWriter<? super T>> classifier = new ClassifierSupport<>(null);
/**
* @param classifier the classifier to set
*/
public void setClassifier(Classifier<T, ItemWriter<? super T>> classifier) {
Assert.notNull(classifier, "A classifier is required.");
this.classifier = classifier;
}
/**
* Delegates to injected {@link ItemWriter} instances according to their
* classification by the {@link Classifier}.
*/
@Override
public void write(List<? extends T> items) throws Exception {
Map<ItemWriter<? super T>, List<T>> map = new LinkedHashMap<>();
for (T item : items) {
ItemWriter<? super T> key = classifier.classify(item);
if (!map.containsKey(key)) {
map.put(key, new ArrayList<>());
}
map.get(key).add(item);
}
for (ItemWriter<? super T> writer : map.keySet()) {
writer.write(map.get(writer));
}
}
}
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