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


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 package gov.nasa.jpf.jvm;
20
21 import gov.nasa.jpf.JPFException;
22
23
24 /**
25  * A specialized version of ElementInfo for use in the DynamicArea.
26  * DynamicElementInfo objects represent heap objects
27  * @see gov.nasa.jpf.jvm.ElementInfo
28  */
29 public class DynamicElementInfo extends ElementInfo {
30   static final int storingDataLength = ElementInfo.storingDataLength;
31
32   public DynamicElementInfo () {
33   }
34
35   public DynamicElementInfo (Fields f, Monitor m) {
36     super(f, m);
37   }
38   
39   public int getNumberOfFields () {
40     return getClassInfo().getNumberOfDeclaredInstanceFields();
41   }
42   
43   public FieldInfo getFieldInfo (int fieldIndex) {
44     return getClassInfo().getInstanceField(fieldIndex);
45   }
46   
47   protected FieldInfo getFieldInfo (String JavaDoc clsBase, String JavaDoc fname) {
48     FieldInfo fi = getClassInfo().getInstanceField(clsBase, fname);
49     if (fi == null) {
50       throw new JPFException( "class " + getClassInfo().getName() +
51                                          " has no field " + fname);
52     }
53     return fi;
54   }
55   
56   protected ElementInfo getElementInfo (ClassInfo ci) {
57     // DynamicElementInfo fields are always flattened, so there is no need to
58 // look up a Fields container
59 return this;
60   }
61   
62   protected Ref getRef () {
63     return new ObjRef(getIndex());
64   }
65 }
66
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