/*
 * Copyright (c) 2014, 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.interop;

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

final class ForeignObjectAccessHeadNode extends Node {

    @Child private ObjectAccessNode first;
    private final Message accessTree;

    protected ForeignObjectAccessHeadNode(Message tree) {
        this.accessTree = tree;
        this.first = new UnresolvedObjectAccessNode();
        adoptChildren();
    }

    protected Message getAccessTree() {
        return accessTree;
    }

    protected ObjectAccessNode getFirst() {
        return first;
    }

    public Object executeForeign(VirtualFrame frame, TruffleObject receiver, Object... arguments) {
        Object ret = first.executeWith(frame, receiver, arguments);
        assert assertReturnValue(ret) : "Only primitive values or TruffleObject expected: " + ret;
        return ret;
    }

    private static boolean assertReturnValue(Object ret) {
        if (ret instanceof Number) {
            return true;
        }
        if (ret instanceof String) {
            return true;
        }
        if (ret instanceof Character) {
            return true;
        }
        if (ret instanceof Boolean) {
            return true;
        }
        return ret instanceof TruffleObject;
    }

}