content: package hip.ch7.friendsofafriend;
  
  import hip.util.Cli;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.conf.Configured;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.io.IntWritable;
  import org.apache.hadoop.io.Text;
  import org.apache.hadoop.mapreduce.Job;
  import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
  import org.apache.hadoop.mapreduce.lib.input.KeyValueTextInputFormat;
  import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
  import org.apache.hadoop.util.Tool;
  import org.apache.hadoop.util.ToolRunner;
  
  public class Main  extends Configured implements Tool {
  
    /**
     * Main entry point for the example.
     *
     * @param args arguments
     * @throws Exception when something goes wrong
     */
    public static void main(final String[] args) throws Exception {
      int res = ToolRunner.run(new Configuration(), new Main(), args);
      System.exit(res);
    }
  
    /**
     * The MapReduce driver - setup and launch the job.
     *
     * @param args the command-line arguments
     * @return the process exit code
     * @throws Exception if something goes wrong
     */
    public int run(final String[] args) throws Exception {
  
      Cli cli = Cli.builder().setArgs(args).addOptions(Options.values()).build();
      int result = cli.runCmd();
  
      if (result != 0) {
        return result;
      }
  
      Path inputPath = new Path(cli.getArgValueAsString(Options.INPUT));
      Path calcOutputPath = new Path(cli.getArgValueAsString(Options.CALC_OUTPUT));
      Path sortOutputPath = new Path(cli.getArgValueAsString(Options.SORT_OUTPUT));
  
      Configuration conf = super.getConf();
  
      if (runCalcJob(conf, inputPath, calcOutputPath)) {
        runSortJob(conf, calcOutputPath, sortOutputPath);
      }
  
      return 0;
    }
  
    public static boolean runCalcJob(Configuration conf, Path input, Path outputPath)
        throws Exception {
  
      Job job = new Job(conf);
      job.setJarByClass(Main.class);
      job.setMapperClass(CalcMapReduce.Map.class);
      job.setReducerClass(CalcMapReduce.Reduce.class);
  
      job.setInputFormatClass(KeyValueTextInputFormat.class);
  
      job.setMapOutputKeyClass(CalcMapReduce.TextPair.class);
      job.setMapOutputValueClass(IntWritable.class);
  
      FileInputFormat.setInputPaths(job, input);
      FileOutputFormat.setOutputPath(job, outputPath);
  
      return job.waitForCompletion(true);
    }
  
    public static void runSortJob(Configuration conf, Path input, Path outputPath)
        throws Exception {
  
      Job job = new Job(conf);
      job.setJarByClass(Main.class);
      job.setMapperClass(SortMapReduce.Map.class);
      job.setReducerClass(SortMapReduce.Reduce.class);
  
      job.setInputFormatClass(KeyValueTextInputFormat.class);
  
      job.setMapOutputKeyClass(Person.class);
      job.setMapOutputValueClass(Person.class);
  
      job.setOutputKeyClass(Text.class);
      job.setOutputValueClass(Text.class);
  
      job.setPartitionerClass(PersonNamePartitioner.class);
      job.setSortComparatorClass(PersonComparator.class);
      job.setGroupingComparatorClass(PersonNameComparator.class);
  
      FileInputFormat.setInputPaths(job, input);
      FileOutputFormat.setOutputPath(job, outputPath);
  
      job.waitForCompletion(true);
    }
  
    public enum Options implements Cli.ArgGetter {
      INPUT(Cli.ArgBuilder.builder().hasArgument(true).required(true).description("Input file or directory")),
      CALC_OUTPUT(Cli.ArgBuilder.builder().hasArgument(true).required(true).description("HDFS output directory")),
      SORT_OUTPUT(Cli.ArgBuilder.builder().hasArgument(true).required(true).description("HDFS output directory"));
      private final Cli.ArgInfo argInfo;
  
      Options(final Cli.ArgBuilder builder) {
        this.argInfo = builder.setArgName(name()).build();
      }
  
      @Override
      public Cli.ArgInfo getArgInfo() {
        return argInfo;
      }
    }
  }
  