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Java > Open Source Codes > DEOS > threadList


1 //
2 // Copyright (C) 2005 United States Government as represented by the
3 // Administrator of the National Aeronautics and Space Administration
4 // (NASA). All Rights Reserved.
5 //
6 // This software is distributed under the NASA Open Source Agreement
7 // (NOSA), version 1.3. The NOSA has been approved by the Open Source
8 // Initiative. See the file NOSA-1.3-JPF at the top of the distribution
9 // directory tree for the complete NOSA document.
10 //
11 // THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
12 // KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
13 // LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
14 // SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
15 // A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
16 // THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
17 // DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
18 //
19 package DEOS;
20
21 /**
22  * DOCUMENT ME!
23  */
24 class threadList extends DoubleLinkListNode {
25   protected threadList () {
26     //System.out.println("threadList Constructor");
27 previous = this;
28     next = this;
29   }
30
31   public boolean isEmpty () {
32     return next == (threadList) this;
33   }
34
35   protected void addAtBeginning (threadListNode newNode) {
36     addAfter(newNode);
37   }
38
39   protected void addAtEnd (threadListNode newNode) {
40     //System.out.println("threadList.addAtEnd");
41 previous.addAfter(newNode);
42   }
43
44   protected threadListNode head () {
45     if (isEmpty()) {
46       System.out.println("Attempt to acquire head of empty list!");
47       System.exit(0);
48     }
49
50     return (threadListNode) next;
51   }
52
53   protected void mergeList (threadList otherList) {
54     //System.out.println("threadList.mergeList");
55 if (!otherList.isEmpty()) {
56       previous.next = otherList.next;
57       otherList.next.previous = previous;
58       previous = otherList.previous;
59       otherList.previous.next = this;
60       otherList.next = otherList;
61       otherList.previous = otherList;
62     }
63   }
64
65   protected threadListNode tail () {
66     if (isEmpty()) {
67       System.out.println("Attempt to acquire tail of empty list!");
68       System.exit(0);
69     }
70
71     return (threadListNode) previous;
72   }
73 }
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