package firstExample;

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 WordCountEx {
	static class MyMapper extends Mapper<Object, Text, Text, IntWritable> {
		private final static IntWritable one = new IntWritable(1);

		private Text word = new Text();

		protected void map(
				Object key,
				Text value,
				org.apache.hadoop.mapreduce.Mapper<Object, Text, Text, IntWritable>.Context context)
				throws java.io.IOException, InterruptedException {

			// 分隔字符串
			StringTokenizer itr = new StringTokenizer(value.toString());
			while (itr.hasMoreTokens()) {
				// 排除字母少于5个字
				String tmp = itr.nextToken();
				if (tmp.length() < 5) {
					continue;
				}
				word.set(tmp);
				context.write(word, one);
			}

		}

	}

	static class MyReduce extends Reducer<Text, IntWritable, Text, IntWritable> {
		private IntWritable result = new IntWritable();
		private Text keyEx = new Text();

		protected void reduce(
				Text key,
				java.lang.Iterable<IntWritable> values,
				org.apache.hadoop.mapreduce.Reducer<Text, IntWritable, Text, IntWritable>.Context context)
				throws java.io.IOException, InterruptedException {
			
			int sum=0;
			for (IntWritable val:values) {
				//
				sum+= val.get()*2;
			}
			
			result.set(sum);
			//自定义输出key
			
			keyEx.set("输出:"+key.toString());
			context.write(keyEx, result);
			
		}
	}
	
	public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
		//配置信息
		Configuration conf=new Configuration();
		
		//job的名称
		Job job=Job.getInstance(conf,"mywordcount");
		
		job.setJarByClass(WordCountEx.class);
		job.setMapperClass(MyMapper.class);
		
		job.setReducerClass(MyReduce.class);
		job.setOutputKeyClass(Text.class);
		job.setOutputValueClass(IntWritable.class);
		
		//输入, 输出path
		FileInputFormat.addInputPath(job, new Path(args[0]));
		FileOutputFormat.setOutputPath(job, new Path(args[1]));
		
		//结束
		System.out.println(job.waitForCompletion(true)?0:1);
		
	}
	
	
	

}