Merge pull request ambujraj#1331 from AElhamidi/patch-1

 FileLetterCounter-JAVA&MapReduce

CONTRIBUTORS.md

@@ -2028,6 +2028,12 @@ About: Student
 Programming Language: C, C++, Java, Python
 Email: [email protected]
 
+Name: [Elhamidi Abdelhay](https://github.com/AElhamidi)<br/>
+Place: Agadir,Morocco<br/>
+About: software engineering student and developer!<br/>
+Programming languages: c++,Java,PHP,Python,Html,js,Css and plenty of other <br/>
+Email: [email protected]
+
 
 Name: Devansh (https://github.com/devanshhooda)
 Place: Delhi, India
@@ -2110,4 +2116,4 @@ Name: [Prasun](https://github.com/rupna100)<br/>
 Place: India<br/>
 About: Computer science student<br/>
 Programming languages: c , cpp, python , ruby , js <br/>
-Email: [email protected]
+Email: [email protected]

FileLetterCounter-JAVA-MapReduce/LetterCount.java

@@ -0,0 +1,99 @@
+import java.io.IOException;
+
+import java.util.StringTokenizer;
+
+
+
+import org.apache.hadoop.conf.Configuration;
+
+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.Mapper;
+
+import org.apache.hadoop.mapreduce.Reducer;
+
+import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
+
+import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
+
+public class LetterCount {
+
+  public static class TokenizerMapper extends Mapper<Object, Text, Text, IntWritable>{
+
+    private final static IntWritable one = new IntWritable(1);
+
+    private Text word = new Text();
+
+    public void map(Object key, Text value, Context context ) throws IOException, InterruptedException {
+
+      StringTokenizer itr = new StringTokenizer(value.toString());
+
+      while (itr.hasMoreTokens()) {
+    	  int i=0;
+    	  String Token=itr.nextToken();
+    	  while(i<Token.length()) {
+    		  	word.set(String.valueOf(Token.charAt(i)));
+    		  	context.write(word, one);
+    		  	i++;
+    	  }
+      }
+
+    }
+
+  }
+
+
+  public static class IntSumReducer  extends Reducer<Text,IntWritable,Text,IntWritable> {
+
+    private IntWritable result = new IntWritable();
+
+    public void reduce(Text key, Iterable<IntWritable> values,Context context ) throws IOException, InterruptedException {
+
+      int sum = 0;
+
+      for (IntWritable val : values) {
+
+        sum += val.get();
+
+      }
+
+      result.set(sum);
+
+      context.write(key, result);
+
+    }
+
+  }
+
+
+  public static void main(String[] args) throws Exception {
+
+    Configuration conf = new Configuration();
+
+    Job job = Job.getInstance(conf, "letter count");
+
+    job.setJarByClass(LetterCount.class);
+
+    job.setMapperClass(TokenizerMapper.class);
+
+    job.setCombinerClass(IntSumReducer.class);
+
+    job.setReducerClass(IntSumReducer.class);
+
+    job.setOutputKeyClass(Text.class);
+
+    job.setOutputValueClass(IntWritable.class);
+
+    FileInputFormat.addInputPath(job, new Path(args[0]));
+
+    FileOutputFormat.setOutputPath(job, new Path(args[1]));
+
+    System.exit(job.waitForCompletion(true) ? 0 : 1);
+
+  }
+
+}