private static void downloadFileFromURL()

in maven-wrapper-distribution/src/resources/mvn/wrapper/MavenWrapperDownloader.java [61:85]

• 25 lines of code
• 3 McCabe index (conditional complexity)

    private static void downloadFileFromURL(URL wrapperUrl, Path wrapperJarPath)
            throws IOException {
        log(" - Downloading to: " + wrapperJarPath);
        if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) {
            final String username = System.getenv("MVNW_USERNAME");
            final char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
            Authenticator.setDefault(new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(username, password);
                }
            });
        }
        Path temp = wrapperJarPath
                .getParent()
                .resolve(wrapperJarPath.getFileName() + "."
                        + Long.toUnsignedString(ThreadLocalRandom.current().nextLong()) + ".tmp");
        try (InputStream inStream = wrapperUrl.openStream()) {
            Files.copy(inStream, temp, StandardCopyOption.REPLACE_EXISTING);
            Files.move(temp, wrapperJarPath, StandardCopyOption.REPLACE_EXISTING);
        } finally {
            Files.deleteIfExists(temp);
        }
        log(" - Downloader complete");
    }