A patch that makes Hadoop's sort example support textual sorts

Sort.java

diff --git src/examples/org/apache/hadoop/examples/Sort.java src/examples/org/apache/hadoop/examples/Sort.java
index a028009..40c7647 100644
--- src/examples/org/apache/hadoop/examples/Sort.java
+++ src/examples/org/apache/hadoop/examples/Sort.java
@@ -20,13 +20,18 @@ package org.apache.hadoop.examples;
 
 import java.io.IOException;
 import java.net.URI;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
 import org.apache.hadoop.filecache.DistributedCache;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.io.BytesWritable;
+import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.io.NullWritable;
+import org.apache.hadoop.io.Text;
 import org.apache.hadoop.io.Writable;
 import org.apache.hadoop.io.WritableComparable;
 import org.apache.hadoop.mapred.*;
@@ -66,6 +71,23 @@ public class Sort<K,V> extends Configured implements Tool {
   }
 
   /**
+   * This mapper converts the output of the TextInputFormat into a sortable
+   * list of lines.
+   */
+  public static class TextMapper
+    extends MapReduceBase 
+    implements Mapper<LongWritable, Text, Text, NullWritable> {
+
+    private static final NullWritable NIL = NullWritable.get();
+
+    public void map(LongWritable key, Text value, 
+                    OutputCollector<Text, NullWritable> output, 
+                    Reporter reporter) throws IOException {
+      output.collect(value, NIL);
+    }
+  }
+
+  /**
    * The main driver for sort program.
    * Invoke this method to submit the map/reduce job.
    * @throws IOException When there is communication problems with the 
@@ -101,6 +123,13 @@ public class Sort<K,V> extends Configured implements Tool {
           jobConf.setNumMapTasks(Integer.parseInt(args[++i]));
         } else if ("-r".equals(args[i])) {
           num_reduces = Integer.parseInt(args[++i]);
+        } else if ("-text".equals(args[i])) {
+          // set the types to get a textual sort of the input
+          inputFormatClass = TextInputFormat.class;
+          jobConf.setMapperClass(TextMapper.class);
+         outputKeyClass = Text.class;
+         outputValueClass = NullWritable.class;
+         outputFormatClass = TextOutputFormat.class;
         } else if ("-inFormat".equals(args[i])) {
           inputFormatClass = 
             Class.forName(args[++i]).asSubclass(InputFormat.class);