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 /*
  * 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
  *
  *      http://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;
Calls one of a collection of ItemWriters for each item, based on a router pattern implemented through the provided org.springframework.batch.classify.Classifier. The implementation is thread-safe if all delegates are thread-safe.

Author(s):
Dave Syer
Since:
2.0
public class ClassifierCompositeItemWriter<T> implements ItemWriter<T> {
	private Classifier<T, ItemWriter<? super T>> classifier = new ClassifierSupport<T, ItemWriter<? super T>>(null);

Parameters:
classifier the classifier to set
	public void setClassifier(Classifier<T, ItemWriter<? super T>> classifier) {
		this. = classifier;
	}

Delegates to injected org.springframework.batch.item.ItemWriter instances according to their classification by the org.springframework.batch.classify.Classifier.
	public void write(List<? extends T> itemsthrows Exception {
		Map<ItemWriter<? super T>, List<T>> map = new HashMap<ItemWriter<? super T>, List<T>>();
		for (T item : items) {
			ItemWriter<? super T> key = .classify(item);
			if (!map.containsKey(key)) {
				map.put(keynew ArrayList<T>());
			}
			map.get(key).add(item);
		}
		for (ItemWriter<? super T> writer : map.keySet()) {
			writer.write(map.get(writer));
		}
	}
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