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}