src/jdk.jpackage/linux/classes/jdk/jpackage/internal/model/LinuxDebPackage.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
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 * by Oracle in the LICENSE file that accompanied this code.
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 * accompanied this code).
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package jdk.jpackage.internal.model;

import java.nio.file.Path;
import java.util.Optional;
import jdk.jpackage.internal.util.CompositeProxy;

/**
 * Linux DEB package.
 * <p>
 * Use {@link #create} method to create objects implementing this interface.
 *
 * @see <a href="https://www.debian.org/doc/debian-policy/ch-binary.html#">https://www.debian.org/doc/debian-policy/ch-binary.html#</a>
 * @see <a href="https://linux.die.net/man/5/deb-control">https://linux.die.net/man/5/deb-control</a>
 */
public interface LinuxDebPackage extends LinuxPackage, LinuxDebPackageMixin {

    /**
     * Gets the value of the maintainer property of this DEB package.
     *
     * @see <a href=
     *      "https://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-maintainer">https://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-maintainer</a>
     * @return the maintainer property of this DEB package
     */
    default String maintainer() {
        return String.format("%s <%s>", app().vendor(), maintainerEmail());
    }

    /**
     * Gets the relative path to this DEB package's copyright file. Returns empty
     * {@link Optional} instance if this DEB package has no copyright file.
     *
     * @return the relative path to the copyright file of this DEB package
     */
    default Optional<Path> relativeCopyrightFilePath() {
        if (isInstallDirInUsrTree() || Path.of("/").resolve(relativeInstallDir()).startsWith("/usr/")) {
            return Optional.of(Path.of("usr/share/doc/", packageName(), "copyright"));
        } else if (!isRuntimeInstaller()) {
            return Optional.of(relativeInstallDir().resolve("share/doc/copyright"));
        } else {
            return Optional.empty();
        }
    }

    /**
     * Constructs {@link LinuxDebPackage} instance from the given
     * {@link LinuxPackage} and {@link LinuxDebPackageMixin} instances.
     *
     * @param pkg the Linux package
     * @param mixin DEB-specific details supplementing the Linux package
     * @return the proxy dispatching calls to the given objects
     */
    public static LinuxDebPackage create(LinuxPackage pkg, LinuxDebPackageMixin mixin) {
        return CompositeProxy.create(LinuxDebPackage.class, pkg, mixin);
    }
}