| 1 | /* |
| 2 | * Copyright 2006-2007 the original author or authors. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.springframework.batch.item.support; |
| 18 | |
| 19 | import java.util.List; |
| 20 | |
| 21 | import org.springframework.batch.item.ExecutionContext; |
| 22 | import org.springframework.batch.item.ItemStream; |
| 23 | import org.springframework.batch.item.ItemStreamException; |
| 24 | import org.springframework.batch.item.ItemStreamWriter; |
| 25 | import org.springframework.batch.item.ItemWriter; |
| 26 | import org.springframework.beans.factory.InitializingBean; |
| 27 | import org.springframework.util.Assert; |
| 28 | |
| 29 | /** |
| 30 | * Calls a collection of {@link ItemWriter}s in fixed-order sequence.<br/> |
| 31 | * <br/> |
| 32 | * |
| 33 | * The implementation is thread-safe if all delegates are thread-safe. |
| 34 | * |
| 35 | * @author Robert Kasanicky |
| 36 | * @author Dave Syer |
| 37 | */ |
| 38 | public class CompositeItemWriter<T> implements ItemStreamWriter<T>, InitializingBean { |
| 39 | |
| 40 | private List<ItemWriter<? super T>> delegates; |
| 41 | |
| 42 | private boolean ignoreItemStream = false; |
| 43 | |
| 44 | public void setIgnoreItemStream(boolean ignoreItemStream) { |
| 45 | this.ignoreItemStream = ignoreItemStream; |
| 46 | } |
| 47 | |
| 48 | public void write(List<? extends T> item) throws Exception { |
| 49 | for (ItemWriter<? super T> writer : delegates) { |
| 50 | writer.write(item); |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | public void afterPropertiesSet() throws Exception { |
| 55 | Assert.notNull(delegates, "The 'delgates' may not be null"); |
| 56 | Assert.notEmpty(delegates, "The 'delgates' may not be empty"); |
| 57 | } |
| 58 | |
| 59 | public void setDelegates(List<ItemWriter<? super T>> delegates) { |
| 60 | this.delegates = delegates; |
| 61 | } |
| 62 | |
| 63 | public void close() throws ItemStreamException { |
| 64 | for (ItemWriter<? super T> writer : delegates) { |
| 65 | if (!ignoreItemStream && (writer instanceof ItemStream)) { |
| 66 | ((ItemStream) writer).close(); |
| 67 | } |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | public void open(ExecutionContext executionContext) throws ItemStreamException { |
| 72 | for (ItemWriter<? super T> writer : delegates) { |
| 73 | if (!ignoreItemStream && (writer instanceof ItemStream)) { |
| 74 | ((ItemStream) writer).open(executionContext); |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | public void update(ExecutionContext executionContext) throws ItemStreamException { |
| 80 | for (ItemWriter<? super T> writer : delegates) { |
| 81 | if (!ignoreItemStream && (writer instanceof ItemStream)) { |
| 82 | ((ItemStream) writer).update(executionContext); |
| 83 | } |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | } |