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.file.transform;
18
19 import java.util.Map;
20
21 import org.springframework.batch.support.PatternMatcher;
22 import org.springframework.beans.factory.InitializingBean;
23 import org.springframework.util.Assert;
24
25 /**
26 * A {@link LineTokenizer} implementation that stores a mapping of String
27 * patterns to delegate {@link LineTokenizer}s. Each line tokenizied will be
28 * checked to see if it matches a pattern. If the line matches a key in the map
29 * of delegates, then the corresponding delegate {@link LineTokenizer} will be
30 * used. Patterns are sorted starting with the most specific, and the first
31 * match succeeds.
32 *
33 * @author Ben Hale
34 * @author Dan Garrette
35 * @author Dave Syer
36 */
37 public class PatternMatchingCompositeLineTokenizer implements LineTokenizer, InitializingBean {
38
39 private PatternMatcher<LineTokenizer> tokenizers = null;
40
41 /*
42 * (non-Javadoc)
43 *
44 * @see
45 * org.springframework.batch.item.file.transform.LineTokenizer#tokenize(
46 * java.lang.String)
47 */
48 @Override
49 public FieldSet tokenize(String line) {
50 return tokenizers.match(line).tokenize(line);
51 }
52
53 /*
54 * (non-Javadoc)
55 *
56 * @see
57 * org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
58 */
59 @Override
60 public void afterPropertiesSet() throws Exception {
61 Assert.isTrue(this.tokenizers != null, "The 'tokenizers' property must be non-empty");
62 }
63
64 public void setTokenizers(Map<String, LineTokenizer> tokenizers) {
65 Assert.isTrue(!tokenizers.isEmpty(), "The 'tokenizers' property must be non-empty");
66 this.tokenizers = new PatternMatcher<LineTokenizer>(tokenizers);
67 }
68 }