| 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.mapping; |
| 18 | |
| 19 | import java.util.Map; |
| 20 | |
| 21 | import org.springframework.batch.item.file.LineMapper; |
| 22 | import org.springframework.batch.item.file.transform.LineTokenizer; |
| 23 | import org.springframework.batch.item.file.transform.PatternMatchingCompositeLineTokenizer; |
| 24 | import org.springframework.batch.support.PatternMatcher; |
| 25 | import org.springframework.beans.factory.InitializingBean; |
| 26 | import org.springframework.util.Assert; |
| 27 | |
| 28 | /** |
| 29 | * <p> |
| 30 | * A {@link LineMapper} implementation that stores a mapping of String patterns |
| 31 | * to delegate {@link LineTokenizer}s as well as a mapping of String patterns to |
| 32 | * delegate {@link FieldSetMapper}s. Each line received will be tokenized and |
| 33 | * then mapped to a field set. |
| 34 | * |
| 35 | * <p> |
| 36 | * Both the tokenizing and the mapping work in a similar way. The line will be |
| 37 | * checked for its matching pattern. If the key matches a pattern in the map of |
| 38 | * delegates, then the corresponding delegate will be used. Patterns are sorted |
| 39 | * starting with the most specific, and the first match succeeds. |
| 40 | * |
| 41 | * @see PatternMatchingCompositeLineTokenizer |
| 42 | * |
| 43 | * @author Dan Garrette |
| 44 | * @author Dave Syer |
| 45 | * @since 2.0 |
| 46 | */ |
| 47 | public class PatternMatchingCompositeLineMapper<T> implements LineMapper<T>, InitializingBean { |
| 48 | |
| 49 | private PatternMatchingCompositeLineTokenizer tokenizer = new PatternMatchingCompositeLineTokenizer(); |
| 50 | |
| 51 | private PatternMatcher<FieldSetMapper<T>> patternMatcher; |
| 52 | |
| 53 | /* |
| 54 | * (non-Javadoc) |
| 55 | * |
| 56 | * @see |
| 57 | * org.springframework.batch.item.file.mapping.LineMapper#mapLine(java.lang |
| 58 | * .String, int) |
| 59 | */ |
| 60 | @Override |
| 61 | public T mapLine(String line, int lineNumber) throws Exception { |
| 62 | return patternMatcher.match(line).mapFieldSet(this.tokenizer.tokenize(line)); |
| 63 | } |
| 64 | |
| 65 | /* |
| 66 | * (non-Javadoc) |
| 67 | * |
| 68 | * @see |
| 69 | * org.springframework.beans.factory.InitializingBean#afterPropertiesSet() |
| 70 | */ |
| 71 | @Override |
| 72 | public void afterPropertiesSet() throws Exception { |
| 73 | this.tokenizer.afterPropertiesSet(); |
| 74 | Assert.isTrue(this.patternMatcher != null, "The 'fieldSetMappers' property must be non-empty"); |
| 75 | } |
| 76 | |
| 77 | public void setTokenizers(Map<String, LineTokenizer> tokenizers) { |
| 78 | this.tokenizer.setTokenizers(tokenizers); |
| 79 | } |
| 80 | |
| 81 | public void setFieldSetMappers(Map<String, FieldSetMapper<T>> fieldSetMappers) { |
| 82 | Assert.isTrue(!fieldSetMappers.isEmpty(), "The 'fieldSetMappers' property must be non-empty"); |
| 83 | this.patternMatcher = new PatternMatcher<FieldSetMapper<T>>(fieldSetMappers); |
| 84 | } |
| 85 | } |