/*
 * Copyright (c) 1998, 2020, 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
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package com.sun.tools.jdi;

import com.sun.jdi.ClassNotLoadedException;
import com.sun.jdi.InvalidTypeException;
import com.sun.jdi.Value;
import com.sun.jdi.VirtualMachine;

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) {
            JNITypeParser sig = new JNITypeParser(destination.signature());
            if (sig.isPrimitive()) {
                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();
}