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Java > Open Source Codes > gov > nasa > jpf > jvm > JPF_java_lang_String


1 //
2 // Copyright (C) 2005 United States Government as represented by the
3 // Administrator of the National Aeronautics and Space Administration
4 // (NASA). All Rights Reserved.
5 //
6 // This software is distributed under the NASA Open Source Agreement
7 // (NOSA), version 1.3. The NOSA has been approved by the Open Source
8 // Initiative. See the file NOSA-1.3-JPF at the top of the distribution
9 // directory tree for the complete NOSA document.
10 //
11 // THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
12 // KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
13 // LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
14 // SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
15 // A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
16 // THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
17 // DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
18 //
19
20 package gov.nasa.jpf.jvm;
21
22 /**
23  * MJI NativePeer class for java.lang.String library abstraction
24  */
25 public class JPF_java_lang_String {
26   public static int intern__ (MJIEnv env, int robj) {
27     // now this is REALLY a naive implementation of 'intern', but
28 // at least we don't burn state for a Hashtable.
29 // Replace this once we have a real String abstraction
30 DynamicArea da = env.getDynamicArea();
31     ElementInfo sei = da.get(robj);
32     ElementInfo[] elems = da.elements;
33
34     // <2do> really? with heap symmetry, can't a corresponding one be at > robj?
35 for (int i = 0; i < robj; i++) {
36       ElementInfo ei = elems[i];
37
38       if (ei != null) {
39         if (ei.equals(sei)) {
40           return i;
41         }
42       }
43     }
44
45     return robj;
46   }
47 }
48
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