// Allison Obourn
// CSE 143, Autumn 2015
// A Downloader 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.

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

public class Downloader {
   private URL url;
   
   // Constructs a new Downloader to download from the given web site URL.
	// Precondition: urlString != null
   public Downloader(String url) throws MalformedURLException {
      this.url = new URL(url);
   }
   
   // Saves the web page from this Downloader's URL to the given file name.
   // 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 fileName) throws IOException {
      InputStream in = url.openStream();
      OutputStream out = new FileOutputStream(fileName);
      
      int success = in.read();
      while(success != -1) {
         out.write(success);
         success = in.read();
      }    
      in.close();
      out.close();    
   }
}