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public static BufferedInputStream newInputStream(File file) throws IOException {
    //noinspection UseOfPropertiesAsHashtable
    var stream = System.getProperties().get(file);
    if (stream instanceof BufferedInputStream) return (BufferedInputStream) stream;
    return new BufferedInputStream(new FileInputStream(file));
}

public static BufferedOutputStream newOutputStream(File file) throws IOException {
    //noinspection UseOfPropertiesAsHashtable
    var stream = System.getProperties().get(file);
    if (stream instanceof BufferedOutputStream) return (BufferedOutputStream) stream;
    return new BufferedOutputStream(new FileOutputStream(file));
}