// Allison Obourn
// CSE 143, Autumn 2015
// A TallyDownloader object stores a URL and can download a web page
// from that URL to save it to a given file on the local hard disk
// and calculate the counts of each character in the file.

// use this as an example of how inheritance works in practice.

import java.io.*;
import java.net.*;
import java.util.*;

public class TallyDownloader extends Downloader {
   
   // Constructs a new TallyDownloader to download from the given web site URL.
	// Precondition: urlString != null
   public TallyDownloader(String url) throws MalformedURLException {
      super(url);
   }
   
   // Saves the web page from this Downloader's URL to the given file name
   // and prints out the counts of the characters in the file.
   // Throws an IOException if the web page does not exist or if anything
   // goes wrong when trying to save the file.
   public void download(String targetFileName) throws IOException {
      super.download(targetFileName);
      Map<Character, Integer> counts = new TreeMap<Character, Integer>();
      FileInputStream in = new FileInputStream(targetFileName);
      int n = in.read();
      while (n != -1) {
         char ch = (char) n;
         if (counts.containsKey(ch)) {
            counts.put(ch, counts.get(ch) + 1);
         } else {
            counts.put(ch, 1);
         }
         System.out.print(ch);
         n = in.read();
      }
      in.close();
      System.out.println(counts);   // print map of char -> int 
   }
}