1 /*
2  * Copyright (c) 1998, 1999, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
23  * questions.
24  */
25 
26 package com.sun.tools.jdi;
27 
28 import com.sun.jdi.*;
29 
30 abstract class ValueImpl extends MirrorImpl implements Value {
31 
ValueImpl(VirtualMachine aVm)32     ValueImpl(VirtualMachine aVm) {
33         super(aVm);
34     }
35 
prepareForAssignment(Value value, ValueContainer destination)36     static ValueImpl prepareForAssignment(Value value,
37                                           ValueContainer destination)
38                   throws InvalidTypeException, ClassNotLoadedException {
39         if (value == null) {
40             /*
41              * TO DO: Centralize JNI signature knowledge
42              */
43             if (destination.signature().length() == 1) {
44                 throw new InvalidTypeException("Can't set a primitive type to null");
45             }
46             return null;    // no further checking or conversion necessary
47         } else {
48             return ((ValueImpl)value).prepareForAssignmentTo(destination);
49         }
50     }
51 
typeValueKey(Value val)52     static byte typeValueKey(Value val) {
53         if (val == null) {
54             return JDWP.Tag.OBJECT;
55         } else {
56             return ((ValueImpl)val).typeValueKey();
57         }
58     }
59 
prepareForAssignmentTo(ValueContainer destination)60     abstract ValueImpl prepareForAssignmentTo(ValueContainer destination)
61                  throws InvalidTypeException, ClassNotLoadedException;
62 
typeValueKey()63     abstract byte typeValueKey();
64 }
65