private static File writeConfToFile()

in rsc/src/main/java/org/apache/livy/rsc/ContextLauncher.java [269:316]
40 lines of code
9 McCabe index (conditional complexity)

  private static File writeConfToFile(RSCConf conf) throws IOException {
    Properties confView = new Properties();
    for (Map.Entry<String, String> e : conf) {
      String key = e.getKey();
      if (!key.startsWith(RSCConf.SPARK_CONF_PREFIX)) {
        key = RSCConf.LIVY_SPARK_PREFIX + key;
      }
      confView.setProperty(key, e.getValue());
    }

    // Load the default Spark configuration.
    String confDir = System.getenv("SPARK_CONF_DIR");
    if (confDir == null && System.getenv(SPARK_HOME_ENV) != null) {
      confDir = System.getenv(SPARK_HOME_ENV) + File.separator + "conf";
    }

    if (confDir != null) {
      File sparkDefaults = new File(confDir + File.separator + "spark-defaults.conf");
      if (sparkDefaults.isFile()) {
        Properties sparkConf = new Properties();
        Reader r = new InputStreamReader(new FileInputStream(sparkDefaults), UTF_8);
        try {
          sparkConf.load(r);
        } finally {
          r.close();
        }

        for (String key : sparkConf.stringPropertyNames()) {
          if (!confView.containsKey(key)) {
            confView.put(key, sparkConf.getProperty(key));
          }
        }
      }
    }

    File file = File.createTempFile("livyConf", ".properties");
    Files.setPosixFilePermissions(file.toPath(), EnumSet.of(OWNER_READ, OWNER_WRITE));
    //file.deleteOnExit();

    Writer writer = new OutputStreamWriter(new FileOutputStream(file), UTF_8);
    try {
      confView.store(writer, "Livy App Context Configuration");
    } finally {
      writer.close();
    }

    return file;
  }