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1   /*
2    * Copyright 2006-2013 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  package org.springframework.batch.core.launch.support;
17  
18  import org.springframework.batch.core.JobParameters;
19  import org.springframework.batch.core.JobParametersBuilder;
20  import org.springframework.batch.core.JobParametersIncrementer;
21  
22  /**
23   * @author Dave Syer
24   */
25  public class RunIdIncrementer implements JobParametersIncrementer {
26  
27  	private static String RUN_ID_KEY = "run.id";
28  
29  	private String key = RUN_ID_KEY;
30  
31  	/**
32  	 * The name of the run id in the job parameters.  Defaults to "run.id".
33  	 *
34  	 * @param key the key to set
35  	 */
36  	public void setKey(String key) {
37  		this.key = key;
38  	}
39  
40  	/**
41  	 * Increment the run.id parameter (starting with 1).
42  	 */
43  	@Override
44  	public JobParameters getNext(JobParameters parameters) {
45  
46  		JobParameters params = (parameters == null) ? new JobParameters() : parameters;
47  
48  		long id = params.getLong(key, 0L) + 1;
49  		return new JobParametersBuilder(params).addLong(key, id).toJobParameters();
50  	}
51  
52  }