private void downloadArtifact()

in src/main/java/org/apache/sling/feature/io/artifacts/ArtifactManager.java [475:524]
44 lines of code
5 McCabe index (conditional complexity)

    private void downloadArtifact(final ArtifactId artifactId) throws IOException {
        // create fake pom
        final Path dir = Files.createTempDirectory(null);
        try {
            final List<String> lines = new ArrayList<String>();
            lines.add(
                    "<project xmlns=\"http://maven.apache.org/POM/4.0.0\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd\">");
            lines.add("    <modelVersion>4.0.0</modelVersion>");
            lines.add("    <groupId>org.apache.sling</groupId>");
            lines.add("    <artifactId>temp-artifact</artifactId>");
            lines.add("    <version>1-SNAPSHOT</version>");
            lines.add("    <dependencies>");
            lines.add("        <dependency>");
            lines.add("            <groupId>".concat(artifactId.getGroupId()).concat("</groupId>"));
            lines.add("            <artifactId>".concat(artifactId.getArtifactId()).concat("</artifactId>"));
            lines.add("            <version>".concat(artifactId.getVersion()).concat("</version>"));
            if (artifactId.getClassifier() != null) {
                lines.add("            <classifier>".concat(artifactId.getClassifier()).concat("</classifier>"));
            }
            if (!"bundle".equals(artifactId.getType()) && !"jar".equals(artifactId.getType())) {
                lines.add("            <type>".concat(artifactId.getType()).concat("</type>"));
            }
            lines.add("            <scope>provided</scope>");
            lines.add("        </dependency>");
            lines.add("    </dependencies>");
            lines.add("</project>");
            logger.debug("Writing pom to {}", dir);
            Files.write(dir.resolve("pom.xml"), lines, Charset.forName("UTF-8"));

            final Path output = dir.resolve("output.txt");
            final Path error = dir.resolve("error.txt");

            // invoke maven
            logger.debug("Invoking mvn...");
            final ProcessBuilder pb = new ProcessBuilder("mvn", "verify");
            pb.directory(dir.toFile());
            pb.redirectOutput(Redirect.to(output.toFile()));
            pb.redirectError(Redirect.to(error.toFile()));

            final Process p = pb.start();
            try {
                p.waitFor();
            } catch (final InterruptedException e) {
                Thread.currentThread().interrupt();
            }

        } finally {
            deleteDirectoryRecursively(dir);
        }
    }