001/*
002 * Copyright 2006-2014 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.sample.support;
018
019import java.io.IOException;
020import java.io.Writer;
021
022import org.springframework.batch.item.file.FlatFileHeaderCallback;
023import org.springframework.batch.item.file.LineCallbackHandler;
024import org.springframework.util.Assert;
025
026/**
027 * Designed to be registered with both {@link org.springframework.batch.item.file.FlatFileItemReader}
028 * and {@link org.springframework.batch.item.file.FlatFileItemWriter} and copy header line from input
029 * file to output file.
030 */
031public class HeaderCopyCallback implements LineCallbackHandler, FlatFileHeaderCallback {
032        private String header = "";
033        
034        @Override
035        public void handleLine(String line) {
036                Assert.notNull(line, "line must not be null");
037                this.header = line;
038        }
039
040        @Override
041        public void writeHeader(Writer writer) throws IOException {
042                writer.write("header from input: " + header);
043        }
044}