content: package com.manning.hip.ch3.xml;
  
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.io.Text;
  import org.apache.hadoop.mapreduce.*;
  import org.apache.hadoop.mapreduce.lib.input.*;
  import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
  
  import java.io.IOException;
  
  public final class SimpleXmlOutputMapReduce {
  
    public static class Reduce
        extends Reducer<Text, Text, Text, Text> {
  
      @Override
      protected void setup(
          Context context)
          throws IOException, InterruptedException {
        context.write(new Text("<configuration>"), null);
      }
  
      @Override
      protected void cleanup(
          Context context)
          throws IOException, InterruptedException {
        context.write(new Text("</configuration>"), null);
      }
  
      private Text outputKey = new Text();
      public void reduce(Text key, Iterable<Text> values,
                         Context context)
          throws IOException, InterruptedException {
        for (Text value : values) {
          outputKey.set(constructPropertyXml(key, value));
          context.write(outputKey, null);
        }
      }
  
      public static String constructPropertyXml(Text name, Text value) {
        StringBuilder sb = new StringBuilder();
        sb.append("<property><name>").append(name)
            .append("</name><value>").append(value)
            .append("</value></property>");
        return sb.toString();
      }
    }
  
    public static void main(String... args) throws Exception {
      runJob(args[0], args[1]);
    }
  
    public static void runJob(String input,
                              String output)
        throws Exception {
      Configuration conf = new Configuration();
  
      Job job = new Job(conf);
      job.setJarByClass(SimpleXmlOutputMapReduce.class);
      job.setReducerClass(Reduce.class);
      job.setInputFormatClass(KeyValueTextInputFormat.class);
  
      job.setMapOutputKeyClass(Text.class);
      job.setMapOutputValueClass(Text.class);
  
      FileInputFormat.setInputPaths(job, new Path(input));
      Path outPath = new Path(output);
      FileOutputFormat.setOutputPath(job, outPath);
  
      outPath.getFileSystem(conf).delete(outPath, true);
  
      job.waitForCompletion(true);
    }
  }
  