FileReader

import java.util.Scanner;
import java.util.HashMap;
import java.io.File;
import java.io.FileNotFoundException;

public class FileReader {
	private File f;

	public FileReader(){
		f = new File("large_text.txt");
	}
	public void read(Heap<HuffmanNode> h) throws FileNotFoundException {
		Scanner scn = new Scanner(f);
		HashMap<Character, Integer> freqTable = new HashMap<>();
		while(scn.hasNextLine()) {
			String s = scn.nextLine() + "\n"; //get next line of text
			for(int i = 0; i < s.length(); i++) { //parse each char of the line
				Character c = s.charAt(i);
				if(freqTable.containsKey(c)) { //if it's not a new character
					freqTable.replace(c, freqTable.get(c) + 1); //++ the current entry
				}
				else {
					freqTable.put(c, Integer.valueOf(1)); //if it doesn't exist yet put it in with value 1
				}
			}
		}
		//System.out.println(freqTable); //DEBUG
		scn.close(); //done with scanner
		for(Character c : freqTable.keySet()) { //create new nodes and put them into the heap
			h.add(new HuffmanNode(c.toString(), freqTable.get(c)));
		}
		System.out.println(h);
	}
}