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.AbstractItemReader; |
24 | import org.springframework.batch.item.ItemReader; |
25 | |
26 | /** |
27 | * An {@link ItemReader} that pulls data from a list. Useful for testing. |
28 | * |
29 | * @author Dave Syer |
30 | * |
31 | */ |
32 | public class ListItemReader extends AbstractItemReader { |
33 | |
34 | private List list; |
35 | |
36 | public ListItemReader(List list) { |
37 | // If it is a proxy we assume it knows how to deal with its own state. |
38 | // (It's probably transaction aware.) |
39 | if (AopUtils.isAopProxy(list)) { |
40 | this.list = list; |
41 | } |
42 | else { |
43 | this.list = new ArrayList(list); |
44 | } |
45 | } |
46 | |
47 | public Object read() { |
48 | if (!list.isEmpty()) { |
49 | return list.remove(0); |
50 | } |
51 | return null; |
52 | } |
53 | |
54 | } |