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Java > Open Source Codes > org > columba > ristretto > imap > parser > SequenceSetParser


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
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35  * ***** END LICENSE BLOCK ***** */
36 package org.columba.ristretto.imap.parser;
37
38 import java.util.regex.Matcher JavaDoc;
39 import java.util.regex.Pattern JavaDoc;
40
41 import org.columba.ristretto.imap.SequenceEntry;
42 import org.columba.ristretto.imap.SequenceSet;
43 import org.columba.ristretto.parser.ParserException;
44
45 /**
46  * Parser for the SequenceSet.
47  *
48  * @author tstich
49  *
50  */
51 public class SequenceSetParser {
52     
53     private static final Pattern JavaDoc SequenceSetPattern = Pattern.compile("(\\d+|\\*)" + // $1 either number or *
54 "(:(\\d+|\\*))?"); // $3 either null, number or *
55
56     /**
57      * Parse the SequenceSet of the input.
58      *
59      * @param in CharSequence representation of the sequence set
60      * @return the SequenceSet.
61      * @throws ParserException
62      */
63     public static SequenceSet parse(CharSequence JavaDoc in) throws ParserException {
64         SequenceSet result = new SequenceSet();
65         
66         Matcher JavaDoc matcher = SequenceSetPattern.matcher(in);
67         while(matcher.find()) {
68             if( matcher.group(3) == null ) { // only a single seq-number
69 if( matcher.group(1).equals("*")) {
70                     result.add(SequenceEntry.STAR);
71                 } else {
72                     result.add(Integer.parseInt(matcher.group(1)));
73                 }
74             } else { // must be a range
75 if( matcher.group(1).equals("*")) {
76                     if( matcher.group(3).equals("*")) {
77                         result.add(SequenceEntry.STAR);
78                     } else {
79                         result.addOpenRange(Integer.parseInt(matcher.group(3)));
80                     }
81                 } else {
82                     if( matcher.group(3).equals("*")){
83                         result.addOpenRange(Integer.parseInt(matcher.group(1)));
84                     } else {
85                         result.add(Integer.parseInt(matcher.group(1)), Integer.parseInt(matcher.group(3)));
86                     }
87                 }
88                 
89             }
90         }
91         
92         return result;
93     }
94
95 }
96
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