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Java > Open Source Codes > proguard > util > ListUtil


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the Free
9  * Software Foundation; either version 2 of the License, or (at your option)
10  * any later version.
11  *
12  * This program is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15  * more details.
16  *
17  * You should have received a copy of the GNU General Public License along
18  * with this program; if not, write to the Free Software Foundation, Inc.,
19  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 package proguard.util;
22
23 import java.util.*;
24
25
26 /**
27  * This class provides some utility methods for working with
28  * <code>java.util.List</code> objects.
29  *
30  * @author Eric Lafortune
31  */
32 public class ListUtil
33 {
34     /**
35      * Creates a comma-separated String from the given List of String objects.
36      */
37     public static String JavaDoc commaSeparatedString(List list)
38     {
39         if (list == null)
40         {
41             return null;
42         }
43
44         StringBuffer JavaDoc buffer = new StringBuffer JavaDoc();
45
46         for (int index = 0; index < list.size(); index++)
47         {
48             if (index > 0)
49             {
50                 buffer.append(',');
51             }
52
53             buffer.append(list.get(index));
54         }
55
56         return buffer.toString();
57     }
58
59
60     /**
61      * Creates a List of String objects from the given comma-separated String.
62      */
63     public static List commaSeparatedList(String JavaDoc string)
64     {
65         if (string == null)
66         {
67             return null;
68         }
69
70         List list = new ArrayList();
71         int index = 0;
72         while (index < string.length())
73         {
74             int nextIndex = string.indexOf(',', index);
75             if (nextIndex < 0)
76             {
77                 nextIndex = string.length();
78             }
79
80             list.add(string.substring(index, nextIndex).trim());
81
82             index = nextIndex + 1;
83         }
84
85         return list;
86     }
87 }
88
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