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Java > Open Source Codes > soot > util > StringNumberer


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 2002 Ondrej Lhotak
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the
16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17  * Boston, MA 02111-1307, USA.
18  */

19
20 package soot.util;
21 import java.util.*;
22
23 /** A class that numbers strings, so they can be placed in bitsets.
24  *
25  * @author Ondrej Lhotak
26  */

27
28 public class StringNumberer extends ArrayNumberer {
29     HashMap stringToNumbered = new HashMap(1024);
30
31     public NumberedString find( String JavaDoc s ) {
32         NumberedString ret = (NumberedString) stringToNumbered.get( s );
33         if( ret == null ) {
34             stringToNumbered.put( s, ret = new NumberedString(s) );
35             add( ret );
36         }
37         return ret;
38     }
39     public NumberedString findOrAdd( String JavaDoc s ) {
40         NumberedString ret = (NumberedString) stringToNumbered.get( s );
41         if( ret == null ) {
42             stringToNumbered.put( s, ret = new NumberedString(s) );
43             add( ret );
44         }
45         return ret;
46     }
47 }
48
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