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Java > Open Source Codes > org > mr > kernel > services > queues > RemoteQueueEnumeration


1 /*
2  * Copyright 2002 by
3  * <a HREF="http://www.coridan.com">Coridan</a>
4  * <a HREF="mailto: support@coridan.com ">support@coridan.com</a>
5  *
6  * The contents of this file are subject to the Mozilla Public License Version
7  * 1.1 (the "License"); you may not use this file except in compliance with the
8  * License. You may obtain a copy of the License at
9  * http://www.mozilla.org/MPL/
10  *
11  * Software distributed under the License is distributed on an "AS IS" basis,
12  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13  * for the specific language governing rights and limitations under the
14  * License.
15  *
16  * The Original Code is "MantaRay" (TM).
17  *
18  * The Initial Developer of the Original Code is Amir Shevat.
19  * Portions created by the Initial Developer are Copyright (C) 2006
20  * Coridan Inc. All Rights Reserved.
21  *
22  * Contributor(s): all the names of the contributors are added in the source
23  * code where applicable.
24  *
25  * Alternatively, the contents of this file may be used under the terms of the
26  * LGPL license (the "GNU LESSER GENERAL PUBLIC LICENSE"), in which case the
27  * provisions of LGPL are applicable instead of those above. If you wish to
28  * allow use of your version of this file only under the terms of the LGPL
29  * License and not to allow others to use your version of this file under
30  * the MPL, indicate your decision by deleting the provisions above and
31  * replace them with the notice and other provisions required by the LGPL.
32  * If you do not delete the provisions above, a recipient may use your version
33  * of this file under either the MPL or the GNU LESSER GENERAL PUBLIC LICENSE.
34  
35  *
36  * This library is free software; you can redistribute it and/or modify it
37  * under the terms of the MPL as stated above or under the terms of the GNU
38  * Lesser General Public License as published by the Free Software Foundation;
39  * either version 2.1 of the License, or any later version.
40  *
41  * This library is distributed in the hope that it will be useful, but WITHOUT
42  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
43  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
44  * License for more details.
45  */
46 /*
47  * Created on Jan 26, 2004
48  * Manta LTD
49  */
50 package org.mr.kernel.services.queues;
51
52 import java.util.ArrayList JavaDoc;
53 import java.util.Enumeration JavaDoc;
54
55
56 import org.mr.MantaAgent;
57 import org.mr.MantaException;
58 import org.mr.kernel.services.ServiceConsumer;
59
60
61 /**
62  * RemoteQueueEnumeration holds a coppy of a remote queue at a given time and enables you to Enumerat over it
63  * Created Jan 26, 2004
64  * Ver 1.0
65  * @author Amir Shevat
66  */
67 public class RemoteQueueEnumeration implements Enumeration JavaDoc {
68     public ArrayList JavaDoc elements;
69     private ServiceConsumer consumer;
70     
71     /**
72      *
73      */
74     public RemoteQueueEnumeration(ServiceConsumer consumer ) {
75         this.consumer = consumer;
76         
77     }
78
79     /* (non-Javadoc)
80      * @see java.util.Enumeration#hasMoreElements()
81      */
82     public boolean hasMoreElements() {
83         if(elements == null)
84             getRemoteQueue();
85         
86         return !elements.isEmpty();
87     }
88
89     /*
90      * (non-Javadoc)
91      * @see java.util.Enumeration#nextElement()
92      */
93     public Object JavaDoc nextElement() {
94         if(elements == null)
95             getRemoteQueue();
96         return elements.remove(0);
97     }//nextElement
98
99     /**
100      *
101      */
102     private void getRemoteQueue() {
103         try {
104             elements = MantaAgent.getInstance().CopyQueueContent(consumer);
105         } catch (MantaException e) {
106             elements = new ArrayList JavaDoc();
107         }
108         
109     }
110
111 }
112
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