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Java > Open Source Codes > org > pdfbox > util > MapUtil


1 /**
2  * Copyright (c) 2005, www.pdfbox.org
3  * 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 met:
7  *
8  * 1. Redistributions of source code must retain the above copyright notice,
9  * this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright notice,
11  * this list of conditions and the following disclaimer in the documentation
12  * and/or other materials provided with the distribution.
13  * 3. Neither the name of pdfbox; nor the names of its
14  * contributors may be used to endorse or promote products derived from this
15  * software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20  * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
24  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  *
28  * http://www.pdfbox.org
29  *
30  */

31 package org.pdfbox.util;
32
33 import java.util.Map JavaDoc;
34
35
36 /**
37  * This class with handle some simple Map operations.
38  *
39  * @author <a HREF="mailto:ben@benlitchfield.com">Ben Litchfield</a>
40  * @version $Revision: 1.2 $
41  */

42 public class MapUtil
43 {
44     private MapUtil()
45     {
46         //utility class
47
}
48     
49     /**
50      * Generate a unique key for the map based on a prefix.
51      *
52      * @param map The map to look for existing keys.
53      * @param prefix The prefix to use when generating the key.
54      * @return The new unique key that does not currently exist in the map.
55      */

56     public static final String JavaDoc getNextUniqueKey( Map JavaDoc map, String JavaDoc prefix )
57     {
58         int counter = 0;
59         while( map.get( prefix+counter ) != null )
60         {
61             counter++;
62         }
63         return prefix+counter;
64     }
65 }
66
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