View Javadoc

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.repeat.policy;
18  
19  import org.springframework.batch.repeat.CompletionPolicy;
20  import org.springframework.batch.repeat.RepeatStatus;
21  import org.springframework.batch.repeat.RepeatContext;
22  import org.springframework.batch.repeat.context.RepeatContextSupport;
23  
24  /**
25   * Very simple base class for {@link CompletionPolicy} implementations.
26   * 
27   * @author Dave Syer
28   * 
29   */
30  public class CompletionPolicySupport implements CompletionPolicy {
31  
32  	/**
33  	 * If exit status is not continuable return <code>true</code>, otherwise
34  	 * delegate to {@link #isComplete(RepeatContext)}.
35  	 * 
36  	 * @see org.springframework.batch.repeat.CompletionPolicy#isComplete(org.springframework.batch.repeat.RepeatContext,
37  	 * RepeatStatus)
38  	 */
39      @Override
40  	public boolean isComplete(RepeatContext context, RepeatStatus result) {
41  		if (result != null && !result.isContinuable()) {
42  			return true;
43  		}
44  		else {
45  			return isComplete(context);
46  		}
47  	}
48  
49  	/**
50  	 * Always true.
51  	 * 
52  	 * @see org.springframework.batch.repeat.CompletionPolicy#isComplete(org.springframework.batch.repeat.RepeatContext)
53  	 */
54      @Override
55  	public boolean isComplete(RepeatContext context) {
56  		return true;
57  	}
58  
59  	/**
60  	 * Build a new {@link RepeatContextSupport} and return it.
61  	 * 
62  	 * @see org.springframework.batch.repeat.CompletionPolicy#start(RepeatContext)
63  	 */
64      @Override
65  	public RepeatContext start(RepeatContext context) {
66  		return new RepeatContextSupport(context);
67  	}
68  
69  	/**
70  	 * Increment the context so the counter is up to date. Do nothing else.
71  	 * 
72  	 * @see org.springframework.batch.repeat.CompletionPolicy#update(org.springframework.batch.repeat.RepeatContext)
73  	 */
74      @Override
75  	public void update(RepeatContext context) {
76  		if (context instanceof RepeatContextSupport) {
77  			((RepeatContextSupport) context).increment();
78  		}
79  	}
80  
81  }