// Constructor
	public MovieGraph(String filename) throws IOException, SecurityException, FileNotFoundException
	{
		// for debugging
		pdbg(filename);

		BufferedReader findLength = new BufferedReader(new FileReader(filename)); //length of document
		int length = 0;
		while(findLength.readLine() != null)
			length++;
		findLength.close();

		HashMap <String, HashSet<String>> dataMtoA = new HashMap<String, HashSet<String>>();
		HashMap <String, HashSet<String>> dataAtoM = new HashMap<String, HashSet<String>>();

		BufferedReader in = new BufferedReader(new FileReader(filename));
		for(int i = 0; i < length; i++)
		{
			String[] currentLine = in.readLine().split("/");
			int rowLength = currentLine.length;

			HashSet<String> setLine = new HashSet<String>();
			for(int j = 1; j < rowLength ; j++)
			{
				setLine.add(currentLine[j]); //adds actor to current line

				String currentAct = currentLine[j];
				if(dataAtoM.containsKey(currentAct)) // any other add movie to actor
				{
					HashSet<String> temp = dataAtoM.get(currentAct);
					temp.add(currentLine[0]); //add movie
					dataAtoM.put(currentAct, temp);
				}
				else if(!dataAtoM.containsKey(currentAct)) //first time add movie to actor
				{
					HashSet<String> temp = new HashSet<String>();
					temp.add(currentLine[0]); //add movie
					dataAtoM.put(currentAct, temp);
				}
			}
			dataMtoA.put(currentLine[0], setLine); // then set line of movie
		}

		allMovies = dataMtoA;
		allActs = dataAtoM;