1/*
2 * Copyright (c) 1998, 2017, 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
26package com.sun.tools.jdi;
27
28import com.sun.jdi.ClassNotLoadedException;
29import com.sun.jdi.InvalidTypeException;
30import com.sun.jdi.Value;
31import com.sun.jdi.VirtualMachine;
32
33abstract class ValueImpl extends MirrorImpl implements Value {
34
35    ValueImpl(VirtualMachine aVm) {
36        super(aVm);
37    }
38
39    static ValueImpl prepareForAssignment(Value value,
40                                          ValueContainer destination)
41                  throws InvalidTypeException, ClassNotLoadedException {
42        if (value == null) {
43            /*
44             * TO DO: Centralize JNI signature knowledge
45             */
46            if (destination.signature().length() == 1) {
47                throw new InvalidTypeException("Can't set a primitive type to null");
48            }
49            return null;    // no further checking or conversion necessary
50        } else {
51            return ((ValueImpl)value).prepareForAssignmentTo(destination);
52        }
53    }
54
55    static byte typeValueKey(Value val) {
56        if (val == null) {
57            return JDWP.Tag.OBJECT;
58        } else {
59            return ((ValueImpl)val).typeValueKey();
60        }
61    }
62
63    abstract ValueImpl prepareForAssignmentTo(ValueContainer destination)
64                 throws InvalidTypeException, ClassNotLoadedException;
65
66    abstract byte typeValueKey();
67}
68