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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.sample.support;
18  
19  import java.io.IOException;
20  import java.io.Writer;
21  
22  import org.springframework.batch.item.file.FlatFileHeaderCallback;
23  import org.springframework.batch.item.file.FlatFileItemReader;
24  import org.springframework.batch.item.file.FlatFileItemWriter;
25  import org.springframework.batch.item.file.LineCallbackHandler;
26  import org.springframework.util.Assert;
27  
28  /**
29   * Designed to be registered with both {@link FlatFileItemReader} and
30   * {@link FlatFileItemWriter} and copy header line from input file to output
31   * file.
32   */
33  public class HeaderCopyCallback implements LineCallbackHandler, FlatFileHeaderCallback {
34  
35  	private String header = "";
36  	
37  	public void handleLine(String line) {
38  		Assert.notNull(line);
39  		this.header = line;
40  	}
41  
42  	public void writeHeader(Writer writer) throws IOException {
43  		writer.write("header from input: " + header);
44  		
45  	}
46  
47  }