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Java > Open Source Codes > org > dspace > checker > ListDispatcher


1 /*
2  * Copyright (c) 2004-2005, Hewlett-Packard Company and Massachusetts
3  * Institute of Technology. All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are
7  * met:
8  *
9  * - Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  *
12  * - Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in the
14  * documentation and/or other materials provided with the distribution.
15  *
16  * - Neither the name of the Hewlett-Packard Company nor the name of the
17  * Massachusetts Institute of Technology nor the names of their
18  * contributors may be used to endorse or promote products derived from
19  * this software without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
28  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
29  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
30  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
31  * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
32  * DAMAGE.
33  */
34 package org.dspace.checker;
35
36 import java.util.Collections JavaDoc;
37 import java.util.EmptyStackException JavaDoc;
38 import java.util.List JavaDoc;
39 import java.util.Stack JavaDoc;
40
41 /**
42  * Really simple dispatcher that just iterates over a pre-defined list of ids.
43  *
44  * @author Jim Downing
45  * @author Grace Carpenter
46  * @author Nathan Sarr
47  *
48  */
49 public class ListDispatcher implements BitstreamDispatcher
50 {
51     /**
52      * List of Integer ids.
53      */
54     Stack JavaDoc bitstreams = new Stack JavaDoc();
55
56     /**
57      * Blanked off, no-op constructor. Do not use.
58      */
59     private ListDispatcher()
60     {
61         ;
62     }
63
64     /**
65      * Main constructor.
66      *
67      * @param bitstreamIds
68      * List of Integer ids to dispatch.
69      */
70     public ListDispatcher(List JavaDoc bitstreamIds)
71     {
72         Collections.reverse(bitstreamIds);
73         bitstreams.addAll(bitstreamIds);
74     }
75
76     /**
77      * @see org.dspace.checker.BitstreamDispatcher#next()
78      */
79     public synchronized int next()
80     {
81         try
82         {
83             return ((Integer JavaDoc) bitstreams.pop()).intValue();
84         }
85         catch (EmptyStackException JavaDoc e)
86         {
87             return SENTINEL;
88         }
89     }
90 }
91
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