private void externalDownload()

in nbm-maven-plugin/src/main/java/org/apache/netbeans/nbm/CreateClusterAppMojo.java [766:823]
56 lines of code
16 McCabe index (conditional complexity)

    private void externalDownload(File f, InputStream is) throws IOException {
        // Cf. org.netbeans.nbbuild.AutoUpdate
        BufferedReader r = new BufferedReader(new InputStreamReader(is, "UTF-8"));
        long crc = -1;
        long size = -1;
        boolean found = false;
        String line;
        while ((line = r.readLine()) != null) {
            if (line.startsWith("CRC:")) {
                crc = Long.parseLong(line.substring(4).trim());
            } else if (line.startsWith("URL:")) {
                String rest = line.substring(4).trim();
                if (rest.startsWith("m2:/")) {
                    if (!found) {
                        String[] coords = rest.substring(4).trim().split(":");
                        Artifact artifact;
                        if (coords.length == 4) {
                            artifact = artifactFactory.
                                    createArtifact(coords[0], coords[1], coords[2], null, coords[3]);
                        } else {
                            artifact = artifactFactory.createArtifactWithClassifier(coords[0], coords[1], coords[2],
                                    coords[3], coords[4]);
                        }
                        try {
                            artifactResolver.
                                    resolve(artifact, project.getRemoteArtifactRepositories(), session.getLocalRepository());
                            FileUtils.copyFile(artifact.getFile(), f);
                            found = true;
                        } catch (AbstractArtifactResolutionException x) {
                            getLog().warn("Cannot find " + line.substring(8), x);
                        }
                    }
                } else if (!found) {
                    String url = line.substring(4).trim();
                    try {
                        // XXX use Wagon API instead
                        FileUtils.copyURLToFile(new URL(url), f);
                        found = true;
                    } catch (IOException x) {
                        getLog().warn("Cannot download " + url, x);
                    }
                }
            } else if (line.startsWith("SIZE:")) {
                size = Long.parseLong(line.substring(5).trim());
            } else {
                getLog().warn("Unrecognized line: " + line);
            }
        }
        if (!found) {
            throw new IOException("Could not download " + f);
        }
        if (crc != -1 && crc != crcForFile(f).getValue()) {
            throw new IOException("CRC-32 of " + f + " does not match declared " + crc);
        }
        if (size != -1 && size != f.length()) {
            throw new IOException("Size of " + f + " does not match declared " + size);
        }
    }