/*
 * Copyright (c) 2013, 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.oracle.truffle.api.impl;

import com.oracle.truffle.api.frame.*;

/**
 * Interface for defining type conversions for frame slot values.
 */
public class DefaultFrameTypeConversion implements FrameTypeConversion {

    private static final DefaultFrameTypeConversion INSTANCE = new DefaultFrameTypeConversion();

    @Override
    public Object getDefaultValue() {
        return null;
    }

    @Override
    public void updateFrameSlot(Frame frame, FrameSlot slot, Object value) {
        if (slot.getKind() != FrameSlotKind.Object) {
            slot.setKind(FrameSlotKind.Object);
        }
        frame.setObject(slot, value);
    }

    public static DefaultFrameTypeConversion getInstance() {
        return INSTANCE;
    }
}