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Truffle is a multi-language framework for executing dynamic languages that achieves high performance when combined with Graal.
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/*
 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * SOFTWARE.
 */
package com.oracle.truffle.api.interop;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.library.CachedLibrary;
import com.oracle.truffle.api.library.ExportLibrary;
import com.oracle.truffle.api.library.ExportMessage;
import com.oracle.truffle.api.library.ReflectionLibrary;

@ExportLibrary(value = InteropLibrary.class, delegateTo = "delegate")
@ExportLibrary(value = ReflectionLibrary.class, delegateTo = "delegate")
@SuppressWarnings("static-method")
final class LegacyMetaObjectWrapper implements TruffleObject {

    final Object original;
    final Object delegate;

    LegacyMetaObjectWrapper(Object original, Object delegate) {
        this.original = original;
        this.delegate = delegate;
    }

    @ExportMessage
    boolean isMetaObject() {
        return true;
    }

    @ExportMessage
    @TruffleBoundary
    boolean hasMetaObject(@CachedLibrary("this.delegate") InteropLibrary library) {
        return library.hasMetaObject(delegate);
    }

    @ExportMessage
    @TruffleBoundary
    Object getMetaObject(@CachedLibrary("this.delegate") InteropLibrary library) throws UnsupportedMessageException {
        Object metaObject = library.getMetaObject(delegate);
        if (metaObject instanceof LegacyMetaObjectWrapper) {
            return metaObject;
        } else {
            return new LegacyMetaObjectWrapper(this.delegate, metaObject);
        }
    }

    @ExportMessage
    @TruffleBoundary
    boolean isMetaInstance(Object instance) {
        Object unboxedInstance = instance;
        Object unboxedOriginal = original;
        if (unboxedInstance instanceof LegacyMetaObjectWrapper) {
            unboxedInstance = ((LegacyMetaObjectWrapper) unboxedInstance).delegate;
        }
        if (unboxedOriginal instanceof LegacyMetaObjectWrapper) {
            unboxedOriginal = ((LegacyMetaObjectWrapper) unboxedOriginal).delegate;
        }
        return unboxedInstance == original;
    }

    @ExportMessage(name = "getMetaSimpleName")
    @ExportMessage(name = "getMetaQualifiedName")
    Object getLegacyMetaName(@CachedLibrary("this.delegate") InteropLibrary delegateInterop) {
        return delegateInterop.toDisplayString(this.delegate);
    }

}