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Java > Open Source Codes > org > columba > ristretto > imap > MessageSet


1 /* ***** BEGIN LICENSE BLOCK *****
2  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
3  *
4  * The contents of this file are subject to the Mozilla Public License Version
5  * 1.1 (the "License"); you may not use this file except in compliance with
6  * the License. You may obtain a copy of the License at
7  * http://www.mozilla.org/MPL/
8  *
9  * Software distributed under the License is distributed on an "AS IS" basis,
10  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
11  * for the specific language governing rights and limitations under the
12  * License.
13  *
14  * The Original Code is Ristretto Mail API.
15  *
16  * The Initial Developers of the Original Code are
17  * Timo Stich and Frederik Dietz.
18  * Portions created by the Initial Developers are Copyright (C) 2004
19  * All Rights Reserved.
20  *
21  * Contributor(s):
22  *
23  * Alternatively, the contents of this file may be used under the terms of
24  * either the GNU General Public License Version 2 or later (the "GPL"), or
25  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
26  * in which case the provisions of the GPL or the LGPL are applicable instead
27  * of those above. If you wish to allow use of your version of this file only
28  * under the terms of either the GPL or the LGPL, and not to allow others to
29  * use your version of this file under the terms of the MPL, indicate your
30  * decision by deleting the provisions above and replace them with the notice
31  * and other provisions required by the GPL or the LGPL. If you do not delete
32  * the provisions above, a recipient may use your version of this file under
33  * the terms of any one of the MPL, the GPL or the LGPL.
34  *
35  * ***** END LICENSE BLOCK ***** */
36 package org.columba.ristretto.imap;
37
38 import java.util.Arrays JavaDoc;
39 import java.util.Collections JavaDoc;
40 import java.util.Iterator JavaDoc;
41 import java.util.List JavaDoc;
42
43 /**
44  * This class represents a message set.
45  *
46  * @author Timo Stich <tstich@users.sourceforge.net>
47  */
48 public class MessageSet {
49
50     protected String JavaDoc messageSetString;
51
52     /**
53      * Constructs a MessageSet.
54      *
55      * @param uids of the members of this message set.
56      */
57     public MessageSet( Object JavaDoc[] uids) {
58         messageSetString = render( uids );
59     }
60     
61     /**
62      * Gets the optimized List representing this message set.
63      *
64      * @return the message set.
65      */
66     public String JavaDoc getString()
67     {
68         return messageSetString;
69     }
70     
71     protected String JavaDoc render(Object JavaDoc[] uids) {
72         StringBuffer JavaDoc result = new StringBuffer JavaDoc();
73         
74         List JavaDoc uidList = Arrays.asList(uids);
75         Collections.sort( uidList );
76         Iterator JavaDoc it = uidList.iterator();
77         boolean inRange = false;
78         int lastValue = ((Integer JavaDoc)it.next()).intValue();
79         int nextValue;
80         
81         // First UID
82 result.append(lastValue);
83         
84         while( it.hasNext() ) {
85             nextValue = ((Integer JavaDoc) it.next()).intValue();
86             // do we have a range?
87 if( nextValue == lastValue + 1) {
88                 inRange = true;
89             } else {
90                 // if in range finish the range
91 if( inRange ) {
92                     result.append(':');
93                     result.append(lastValue);
94
95                     inRange = false;
96                 }
97                 
98                 // append the new value
99 result.append(',');
100                 result.append(nextValue);
101             }
102             
103             lastValue = nextValue;
104         }
105         
106         // finish a open range
107 if( inRange ) {
108             result.append(':');
109             result.append(lastValue);
110         }
111         
112         return result.toString();
113     }
114
115 }
116
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