Write a simple search engine which can locate a musical group from the attached dataset and return its url fragment.

Searcher.java

import java.util.Scanner;
import java.util.HashMap;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

/* Basically create a cache by pre-processing
   the data file. And then it is just a data
   lookup. If i would have to implement a sub-
   string search i would have built a trie instead.
  
   As the cache load is just one time (during program
   load) this makes querying very fast.
  
   Usage: javac Searcher.java; java Searcher musical_group.tsv
*/ 
public class Searcher {

    private String filePath;
    private HashMap<String, String> cache;

    private void prompt() {
        System.out.print("search> ");
    }

    public Searcher(String filePath) {
        this.filePath = filePath;
        this.cache = new HashMap<String, String>();
    }

    public String search(String query) {
        if(cache.containsKey(query))
            return cache.get(query);
        else
            return "Not found.";
    }

    public void preprocess() {
        BufferedReader br = null;
        String line = "";
        String tsvSplitBy = "\t";

        try {
            br = new BufferedReader(new FileReader(this.filePath));
            br.readLine();
            while ((line = br.readLine()) != null) {
                String[] items = line.split(tsvSplitBy);
                cache.put(items[0], items[1]);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    public static void main(String[] args) {
        Searcher searcher = new Searcher(args[0]);
        searcher.preprocess();

        searcher.prompt();
        Scanner scanner = new Scanner(System.in);
        while(scanner.hasNext()) {
            String results = searcher.search(scanner.nextLine());
            System.out.println(results);
            searcher.prompt();
        }
    }
}