src/jdk.jpackage/share/classes/jdk/jpackage/internal/model/DefaultLauncherIcon.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
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 * 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).
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package jdk.jpackage.internal.model;

import java.util.Optional;

/**
 * Default application launcher icon.
 * <p>
 * Default icon is either loaded from the resources of {@link jdk.jpackage/} module or picked from the resource directory.
 * <p>
 * Use {@link #INSTANCE} field to get an instance of this type.
 */
public interface DefaultLauncherIcon extends LauncherIcon {

    /**
     * Returns the given icon as {@link DefaultLauncherIcon} type or an empty {@link Optional} instance
     * if the given icon object is not an instance of {@link DefaultLauncherIcon} type.
     *
     * @param icon application launcher icon object or <code>null</null>
     * @return the given icon as {@link DefaultLauncherIcon} type or an empty {@link Optional} instance
     */
    public static Optional<DefaultLauncherIcon> fromLauncherIcon(LauncherIcon icon) {
        if (icon instanceof DefaultLauncherIcon defaultIcon) {
            return Optional.of(defaultIcon);
        } else {
            return Optional.empty();
        }
    }

    /**
     * Singleton.
     */
    public static DefaultLauncherIcon INSTANCE = new DefaultLauncherIcon() {};
}