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GraalVM is an ecosystem for compiling and running applications written in multiple languages. GraalVM removes the isolation between programming languages and enables interoperability in a shared runtime.

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/*
 * Copyright (c) 2017, 2018, 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
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 * 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.
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 * This license is subject to the following condition:
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 * The above copyright notice and either this complete permission notice or at a
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 */
package org.graalvm.nativeimage.impl;

import org.graalvm.nativeimage.ImageSingletons;
import org.graalvm.nativeimage.Platform;
import org.graalvm.nativeimage.Platforms;

@Platforms(Platform.HOSTED_ONLY.class)
public abstract class ImageSingletonsSupport {

    /** Implementation-specific singleton that stores the registration data. */
    private static ImageSingletonsSupport support;

    protected static void installSupport(ImageSingletonsSupport imageSingletonsSupport) {
        assert imageSingletonsSupport != null : "ImageSingletonsSupport cannot be null.";
        support = imageSingletonsSupport;
    }

    public static ImageSingletonsSupport get() {
        checkInstalled();
        return support;
    }

    private static void checkInstalled() {
        if (support == null) {
            throw new Error("The class " + ImageSingletons.class.getSimpleName() + " can only be used when building native images, i.e., when using the native-image command.");
        }
    }

    protected ImageSingletonsSupport() {
    }

    public abstract  void add(Class key, T value);

    public abstract  T lookup(Class key);

    public abstract boolean contains(Class key);
}