Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
DuplicateStep |
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| 1.6666666666666667;1.667 |
1 | /* | |
2 | * Copyright 1999-2001,2004 The Apache Software Foundation. | |
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.apache.commons.workflow.core; | |
18 | ||
19 | ||
20 | import java.util.EmptyStackException; | |
21 | import org.apache.commons.workflow.Context; | |
22 | import org.apache.commons.workflow.StepException; | |
23 | import org.apache.commons.workflow.base.BaseStep; | |
24 | ||
25 | ||
26 | /** | |
27 | * <p>Push a new copy of the top item on the evaluation | |
28 | * stack onto the stack.</p> | |
29 | * | |
30 | * @version $Revision: 155475 $ $Date: 2005-02-26 13:31:11 +0000 (Sat, 26 Feb 2005) $ | |
31 | * @author Craig R. McClanahan | |
32 | */ | |
33 | ||
34 | public class DuplicateStep extends BaseStep { | |
35 | ||
36 | ||
37 | // ----------------------------------------------------------= Constructors | |
38 | ||
39 | ||
40 | /** | |
41 | * Construct a default instance of this Step. | |
42 | */ | |
43 | public DuplicateStep() { | |
44 | ||
45 | 0 | super(); |
46 | ||
47 | 0 | } |
48 | ||
49 | ||
50 | /** | |
51 | * Construct an instance of this Step with the specified identifier. | |
52 | * | |
53 | * @param id Step identifier | |
54 | */ | |
55 | public DuplicateStep(String id) { | |
56 | ||
57 | 0 | super(); |
58 | 0 | setId(id); |
59 | ||
60 | 0 | } |
61 | ||
62 | ||
63 | // --------------------------------------------------------- Public Methods | |
64 | ||
65 | ||
66 | /** | |
67 | * Perform the executable actions related to this Step, in the context of | |
68 | * the specified Context. | |
69 | * | |
70 | * @param context The Context that is tracking our execution state | |
71 | * | |
72 | * @exception StepException if a processing error has occurred | |
73 | */ | |
74 | public void execute(Context context) throws StepException { | |
75 | ||
76 | // Peek at the top value on the evaluation stack | |
77 | 0 | Object value = null; |
78 | try { | |
79 | 0 | value = context.peek(); |
80 | 0 | } catch (EmptyStackException e) { |
81 | 0 | throw new StepException("Evaluation stack is empty", e, this); |
82 | 0 | } |
83 | ||
84 | // Push another copy of this value | |
85 | 0 | context.push(value); |
86 | ||
87 | 0 | } |
88 | ||
89 | ||
90 | } |