import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.FileVisitor;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Map;

import org.apache.spark.SparkConf;
import scala.Tuple2;

public class App {

  public static void main(String[] args) throws IOException {
    SparkConf sparkConf = new SparkConf();

    System.out.println("SPARK PROPERTIES");

    for (Tuple2<String, String> entry : sparkConf.getAll()) {
      System.out.println(entry._1() + " -> " + entry._2());
    }

    System.out.println();
    System.out.println();

    System.out.println("JAVA PROPERTIES");
    for (Map.Entry<Object, Object> entry : System.getProperties().entrySet()) {
      System.out.println(entry.getKey() + " -> " + entry.getValue());
    }

    System.out.println();
    System.out.println();

    System.out.println("ENVIRONMENT VARIABLES PROPERTIES");
    for (Map.Entry<String, String> entry : System.getenv().entrySet()) {
      System.out.println(entry.getKey() + " -> " + entry.getValue());
    }

    System.out.println();
    System.out.println();

    System.out.println("FILE LISTING");
    String ROOT = ".";
    FileVisitor<Path> fileProcessor = new ProcessFile();
    Files.walkFileTree(Paths.get(ROOT), fileProcessor);
  }

  private static final class ProcessFile extends SimpleFileVisitor<Path> {

    @Override
    public FileVisitResult visitFile(Path aFile, BasicFileAttributes aAttrs) throws IOException {
      System.out.println("Processing file:" + aFile);
      return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult preVisitDirectory(Path aDir, BasicFileAttributes aAttrs) throws IOException {
      System.out.println("Processing directory:" + aDir);
      return FileVisitResult.CONTINUE;
    }
  }

}