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 | package org.springframework.batch.item.validator; |
17 | |
18 | import org.springframework.batch.item.support.DelegatingItemReader; |
19 | import org.springframework.util.Assert; |
20 | |
21 | /** |
22 | * Simple extension of {@link DelegatingItemReader} that provides for |
23 | * validation before returning input. |
24 | * |
25 | * @author Lucas Ward |
26 | * |
27 | */ |
28 | public class ValidatingItemReader extends DelegatingItemReader { |
29 | |
30 | private Validator validator; |
31 | |
32 | /* (non-Javadoc) |
33 | * @see org.springframework.batch.item.reader.DelegatingItemReader#afterPropertiesSet() |
34 | */ |
35 | public void afterPropertiesSet() throws Exception { |
36 | super.afterPropertiesSet(); |
37 | Assert.notNull(validator, "Validator must not be null."); |
38 | } |
39 | |
40 | /* (non-Javadoc) |
41 | * @see org.springframework.batch.item.reader.DelegatingItemReader#read() |
42 | */ |
43 | public Object read() throws Exception { |
44 | Object input = super.read(); |
45 | if(input != null){ |
46 | validator.validate(input); |
47 | } |
48 | return input; |
49 | } |
50 | |
51 | /** |
52 | * Set the validator used to validate each item. |
53 | * |
54 | * @param validator |
55 | */ |
56 | public void setValidator(Validator validator) { |
57 | this.validator = validator; |
58 | } |
59 | } |