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 

    32     ValueImpl(VirtualMachine aVm) {

    33         super(aVm);

    34     }

    35 

    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 

    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 

    60     abstract ValueImpl prepareForAssignmentTo(ValueContainer destination)

    61                  throws InvalidTypeException, ClassNotLoadedException;

    62 

    63     abstract byte typeValueKey();

    64 }