001/*
002 * Copyright 2006-2007 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.batch.item.file.transform;
018
019import java.util.Map;
020
021import org.springframework.batch.support.PatternMatcher;
022import org.springframework.beans.factory.InitializingBean;
023import org.springframework.util.Assert;
024
025/**
026 * A {@link LineTokenizer} implementation that stores a mapping of String
027 * patterns to delegate {@link LineTokenizer}s. Each line tokenized will be
028 * checked to see if it matches a pattern. If the line matches a key in the map
029 * of delegates, then the corresponding delegate {@link LineTokenizer} will be
030 * used. Patterns are sorted starting with the most specific, and the first
031 * match succeeds.
032 * 
033 * @author Ben Hale
034 * @author Dan Garrette
035 * @author Dave Syer
036 */
037public class PatternMatchingCompositeLineTokenizer implements LineTokenizer, InitializingBean {
038
039        private PatternMatcher<LineTokenizer> tokenizers = null;
040
041        /*
042         * (non-Javadoc)
043         * 
044         * @see
045         * org.springframework.batch.item.file.transform.LineTokenizer#tokenize(
046         * java.lang.String)
047         */
048    @Override
049        public FieldSet tokenize(String line) {
050                return tokenizers.match(line).tokenize(line);
051        }
052
053        /*
054         * (non-Javadoc)
055         * 
056         * @see
057         * org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
058         */
059    @Override
060        public void afterPropertiesSet() throws Exception {
061                Assert.isTrue(this.tokenizers != null, "The 'tokenizers' property must be non-empty");
062        }
063
064        public void setTokenizers(Map<String, LineTokenizer> tokenizers) {
065                Assert.isTrue(!tokenizers.isEmpty(), "The 'tokenizers' property must be non-empty");
066                this.tokenizers = new PatternMatcher<LineTokenizer>(tokenizers);
067        }
068}