Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
WhileNotAnyStep |
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| 2.2;2.2 |
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.Block; | |
22 | import org.apache.commons.workflow.BlockState; | |
23 | import org.apache.commons.workflow.Context; | |
24 | import org.apache.commons.workflow.Descriptor; | |
25 | import org.apache.commons.workflow.Iterator; | |
26 | import org.apache.commons.workflow.Step; | |
27 | import org.apache.commons.workflow.StepException; | |
28 | import org.apache.commons.workflow.base.BaseBlock; | |
29 | ||
30 | ||
31 | /** | |
32 | * <p>Repeatedly evaluate the properties specified by the associated | |
33 | * Descriptors, and execute the nested Steps if and only if | |
34 | * <strong>ALL</strong> of them evaluate to a negative result. | |
35 | * To avoid non-deterministic evaluation | |
36 | * stack behavior, all of the specified Descriptors are always | |
37 | * evaluated exactly once.</p> | |
38 | * | |
39 | * @version $Revision: 155475 $ $Date: 2005-02-26 13:31:11 +0000 (Sat, 26 Feb 2005) $ | |
40 | * @author Craig R. McClanahan | |
41 | */ | |
42 | ||
43 | public class WhileNotAnyStep extends WhileStep { | |
44 | ||
45 | ||
46 | // ----------------------------------------------------------= Constructors | |
47 | ||
48 | ||
49 | /** | |
50 | * Construct a default instance of this Step. | |
51 | */ | |
52 | public WhileNotAnyStep() { | |
53 | ||
54 | 0 | super(); |
55 | ||
56 | 0 | } |
57 | ||
58 | ||
59 | /** | |
60 | * Construct an instance of this Step with the specified identifier. | |
61 | * | |
62 | * @param id Step identifier | |
63 | */ | |
64 | public WhileNotAnyStep(String id) { | |
65 | ||
66 | 0 | this(id, null); |
67 | ||
68 | 0 | } |
69 | ||
70 | ||
71 | /** | |
72 | * Construct a fully configured instance of this Step. | |
73 | * | |
74 | * @param id Step identifier of this step | |
75 | * @param descriptor Initial descriptor to be added | |
76 | */ | |
77 | public WhileNotAnyStep(String id, Descriptor descriptor) { | |
78 | ||
79 | 0 | super(); |
80 | 0 | setId(id); |
81 | 0 | if (descriptor != null) |
82 | 0 | addDescriptor(descriptor); |
83 | ||
84 | 0 | } |
85 | ||
86 | ||
87 | // --------------------------------------------------------- Public Methods | |
88 | ||
89 | ||
90 | /** | |
91 | * Render a string representation of this Step. | |
92 | */ | |
93 | public String toString() { | |
94 | ||
95 | 0 | StringBuffer sb = new StringBuffer("<core:whileAny"); |
96 | 0 | if (getId() != null) { |
97 | 0 | sb.append(" id=\""); |
98 | 0 | sb.append(getId()); |
99 | 0 | sb.append("\""); |
100 | } | |
101 | 0 | sb.append(">"); |
102 | 0 | Descriptor descriptors[] = findDescriptors(); |
103 | 0 | for (int i = 0; i < descriptors.length; i++) |
104 | 0 | sb.append(descriptors[i]); |
105 | 0 | Step steps[] = getSteps(); |
106 | 0 | for (int i = 0; i < steps.length; i++) |
107 | 0 | sb.append(steps[i]); |
108 | 0 | sb.append("</core:whileAny>"); |
109 | 0 | return (sb.toString()); |
110 | ||
111 | } | |
112 | ||
113 | ||
114 | // ------------------------------------------------------ Protected Methods | |
115 | ||
116 | ||
117 | /** | |
118 | * Evaluate the condition specified by the Descriptors associated with | |
119 | * this Block, and return the resulting boolean value. | |
120 | * | |
121 | * @param context Context within which to evaluate the descriptors | |
122 | */ | |
123 | protected boolean evaluate(Context context) { | |
124 | ||
125 | 0 | boolean condition = false; |
126 | 0 | Descriptor descriptors[] = findDescriptors(); |
127 | 0 | for (int i = 0; i < descriptors.length; i++) { |
128 | 0 | if (descriptors[i].positive(context)) |
129 | 0 | condition = true; |
130 | } | |
131 | 0 | return (!condition); |
132 | ||
133 | } | |
134 | ||
135 | ||
136 | } |