/*

 * Copyright (c) 1998, 1999, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.tools.jdi;

import com.sun.jdi.*;

abstract class ValueImpl extends MirrorImpl implements Value {

    ValueImpl(VirtualMachine aVm) {

        super(aVm);

    }

    static ValueImpl prepareForAssignment(Value value,

                                          ValueContainer destination)

                  throws InvalidTypeException, ClassNotLoadedException {

        if (value == null) {

            /*

             * TO DO: Centralize JNI signature knowledge

             */

            if (destination.signature().length() == 1) {

                throw new InvalidTypeException("Can't set a primitive type to null");

            }

            return null;    // no further checking or conversion necessary

        } else {

            return ((ValueImpl)value).prepareForAssignmentTo(destination);

        }

    }

    static byte typeValueKey(Value val) {

        if (val == null) {

            return JDWP.Tag.OBJECT;

        } else {

            return ((ValueImpl)val).typeValueKey();

        }

    }

    abstract ValueImpl prepareForAssignmentTo(ValueContainer destination)

                 throws InvalidTypeException, ClassNotLoadedException;

    abstract byte typeValueKey();

}