| 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.ArrayList; |
| 20 | import java.util.List; |
| 21 | |
| 22 | import org.springframework.aop.support.AopUtils; |
| 23 | import org.springframework.batch.item.ItemReader; |
| 24 | |
| 25 | /** |
| 26 | * An {@link ItemReader} that pulls data from a list. Useful for testing. |
| 27 | * |
| 28 | * @author Dave Syer |
| 29 | * |
| 30 | */ |
| 31 | public class ListItemReader<T> implements ItemReader<T> { |
| 32 | |
| 33 | private List<T> list; |
| 34 | |
| 35 | public ListItemReader(List<T> list) { |
| 36 | // If it is a proxy we assume it knows how to deal with its own state. |
| 37 | // (It's probably transaction aware.) |
| 38 | if (AopUtils.isAopProxy(list)) { |
| 39 | this.list = list; |
| 40 | } |
| 41 | else { |
| 42 | this.list = new ArrayList<T>(list); |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | public T read() { |
| 47 | if (!list.isEmpty()) { |
| 48 | return list.remove(0); |
| 49 | } |
| 50 | return null; |
| 51 | } |
| 52 | |
| 53 | } |