/*
 * Copyright 2006-2007 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.batch.item.file.mapping;

import org.springframework.batch.item.file.FlatFileParseException;
import org.springframework.batch.item.file.LineMapper;
import org.springframework.batch.item.file.transform.FieldSet;
import org.springframework.batch.item.file.transform.LineTokenizer;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;

/**
 * Two-phase {@link LineMapper} implementation consisting of tokenization of the
 * line into {@link FieldSet} followed by mapping to item.  By default, any exceptions
 * thrown by either delegates will be wrapped in a {@link FlatFileParseException} before
 * being rethrown.  If finer grained control of exceptions is needed, the {@link LineMapper}
 * interface should be implemented directly.
 * 
 * @author Robert Kasanicky
 * @author Lucas Ward
 * 
 * @param <T> type of the item
 */
public class DefaultLineMapper<T> implements LineMapper<T>, InitializingBean {

	private LineTokenizer tokenizer;

	private FieldSetMapper<T> fieldSetMapper;

	public T mapLine(String line, int lineNumber) throws Exception {
		try{
			return fieldSetMapper.mapFieldSet(tokenizer.tokenize(line));
		}
		catch(Exception ex){
			throw new FlatFileParseException("Parsing error at line: " + lineNumber + 
					", input=[" + line + "]", ex, line, lineNumber); 
		}
	}

	public void setLineTokenizer(LineTokenizer tokenizer) {
		this.tokenizer = tokenizer;
	}

	public void setFieldSetMapper(FieldSetMapper<T> fieldSetMapper) {
		this.fieldSetMapper = fieldSetMapper;
	}

	public void afterPropertiesSet() {
		Assert.notNull(tokenizer, "The LineTokenizer must be set");
		Assert.notNull(fieldSetMapper, "The FieldSetMapper must be set");
	}

}
