src/jdk.jpackage/share/classes/jdk/jpackage/internal/PackageFile.java

/*
 * Copyright (c) 2022, 2025, 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.
 *
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package jdk.jpackage.internal;

import jdk.jpackage.internal.model.ApplicationLayout;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Objects;

final class PackageFile {

    /**
     * Returns path to package file.
     * @param appLayout - application layout
     */
    static Path getPathInAppImage(ApplicationLayout appLayout) {
        return appLayout.appDirectory().resolve(FILENAME);
    }

    PackageFile(String packageName) {
        this.packageName = Objects.requireNonNull(packageName);
    }

    void save(ApplicationLayout appLayout) throws IOException {
        final var dstDir = appLayout.appDirectory();
        Files.createDirectories(dstDir);
        Files.writeString(dstDir.resolve(FILENAME), packageName);
    }

    private final String packageName;

    private static final String FILENAME = ".package";
}