public Path createDist()

in maven-wrapper/src/main/java/org/apache/maven/wrapper/Installer.java [63:123]
55 lines of code
13 McCabe index (conditional complexity)

    public Path createDist(WrapperConfiguration configuration) throws Exception {
        URI distributionUrl = configuration.getDistribution();

        boolean alwaysDownload = configuration.isAlwaysDownload();
        boolean alwaysUnpack = configuration.isAlwaysUnpack();
        boolean verifyDistributionSha256Sum =
                !configuration.getDistributionSha256Sum().isEmpty();

        PathAssembler.LocalDistribution localDistribution = pathAssembler.getDistribution(configuration);
        Path localZipFile = localDistribution.getZipFile();

        if (alwaysDownload || alwaysUnpack || Files.notExists(localZipFile)) {
            Logger.info("Installing Maven distribution "
                    + localDistribution.getDistributionDir().toAbsolutePath());
        }

        boolean downloaded = false;
        if (alwaysDownload || Files.notExists(localZipFile)) {
            Logger.info("Downloading " + distributionUrl);
            Path tmpZipFile = localZipFile.resolveSibling(localZipFile.getFileName() + ".part");
            Files.deleteIfExists(tmpZipFile);
            download.download(distributionUrl, tmpZipFile);
            Files.move(tmpZipFile, localZipFile, StandardCopyOption.REPLACE_EXISTING);
            downloaded = Files.exists(localZipFile);
        }

        Path distDir = localDistribution.getDistributionDir();
        List<Path> dirs = listDirs(distDir);

        if (downloaded || alwaysUnpack || dirs.isEmpty()) {
            if (verifyDistributionSha256Sum) {
                verifier.verify(
                        localZipFile,
                        "distributionSha256Sum",
                        Verifier.SHA_256_ALGORITHM,
                        configuration.getDistributionSha256Sum());
            }
            for (Path dir : dirs) {
                Logger.info("Deleting directory " + dir.toAbsolutePath());
                deleteDir(dir);
            }
            Logger.info("Unzipping " + localZipFile.toAbsolutePath() + " to " + distDir.toAbsolutePath());
            unzip(localZipFile, distDir);
            dirs = listDirs(distDir);
            if (dirs.isEmpty()) {
                throw new RuntimeException(String.format(
                        Locale.ROOT,
                        "Maven distribution '%s' does not contain any directory."
                                + " Expected to find exactly 1 directory.",
                        distDir));
            }
            setExecutablePermissions(dirs.get(0));
        }
        if (dirs.size() != 1) {
            throw new RuntimeException(String.format(
                    Locale.ROOT,
                    "Maven distribution '%s' contains too many directories." + " Expected to find exactly 1 directory.",
                    distDir));
        }
        return dirs.get(0);
    }