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 | package org.springframework.batch.core.step.tasklet; |
17 | |
18 | import org.springframework.batch.item.adapter.AbstractMethodInvokingDelegator; |
19 | import org.springframework.batch.repeat.ExitStatus; |
20 | |
21 | /** |
22 | * A {@link Tasklet} that wraps a method in a POJO. By default the return value |
23 | * is {@link ExitStatus#FINISHED} unless the delegate POJO itself returns an |
24 | * {@link ExitStatus}. The POJO method is usually going to have no arguments, |
25 | * but a static argument or array of arguments can be used by setting the |
26 | * arguments property. |
27 | * |
28 | * @see AbstractMethodInvokingDelegator |
29 | * |
30 | * @author Dave Syer |
31 | * |
32 | */ |
33 | public class TaskletAdapter extends AbstractMethodInvokingDelegator implements Tasklet { |
34 | |
35 | /** |
36 | * Delegate execution to the target object and translate the return value to |
37 | * an {@link ExitStatus} by invoking a method in the delegate POJO. |
38 | * |
39 | * @see org.springframework.batch.core.step.tasklet.Tasklet#execute() |
40 | */ |
41 | public ExitStatus execute() throws Exception { |
42 | return mapResult(invokeDelegateMethod()); |
43 | } |
44 | |
45 | /** |
46 | * If the result is an {@link ExitStatus} already just return that, |
47 | * otherwise return {@link ExitStatus#FINISHED}. |
48 | * |
49 | * @param result the value returned by the delegate method |
50 | * @return an {@link ExitStatus} consistent with the result |
51 | */ |
52 | protected ExitStatus mapResult(Object result) { |
53 | if (result instanceof ExitStatus) { |
54 | return (ExitStatus) result; |
55 | } |
56 | return ExitStatus.FINISHED; |
57 | } |
58 | |
59 | } |