FP.java

package io.sytac;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * Created by skuro on 17/03/16.
 */
public class Start {

    public static void main(String[] args) {
        Start start = new Start();
        start.perform();
    }


    private void perform() {
       List<Tupel> list = new ArrayList<>();

        try (Stream<String> stream = Files.lines(Paths.get("/Users/skuro/Development/Sytac/fp/foo/src/main/resources/file.txt"))){


            Integer lineNumber=stream.limit(1).mapToInt(Integer::parseInt).sum();
            Stream<String> finalStream = Files.lines(Paths.get("/Users/skuro/Development/Sytac/fp/foo/src/main/resources/file.txt"));

            list = finalStream.skip(1).limit(lineNumber)
                    .map(String::trim)
                    .map(line -> {
                        String clientId = line.split("\\s{6}")[0];
                        String miles = line.split("\\s{6}")[1];
                        Integer milesValue;
                        if(miles.endsWith("|")){
                            milesValue = Integer.parseInt(miles.replace("|","0"));
                            milesValue *= -1;

                        } else {
                            milesValue = Integer.parseInt(miles);
                        }


                     return new Tupel(clientId, milesValue);
                    })
                    .collect(Collectors.groupingBy(Tupel::getId)).entrySet().stream()
            .map(entry->{

                List<Tupel> tuples=entry.getValue();
                Integer sum=tuples.stream().mapToInt(tupel->tupel.getMiles()).sum();
                return new Tupel(entry.getKey(),sum);
            }).collect(Collectors.toList());
        }
        catch(IOException ioe){
            ioe.printStackTrace();
        }

        list.forEach(System.out::println);
    }

    class Tupel {
        private final String id;
        private final Integer miles;

        public Tupel(final String id, final Integer miles) {
            this.id = id;
            this.miles = miles;
        }

        public String getId() {
            return id;
        }


        public Integer getMiles() {
            return miles;
        }

        @Override
        public String toString() {
            return "Tupel{" +
                    "id='" + id + '\'' +
                    ", miles=" + miles +
                    '}';
        }
    }
}