Popcorn.java

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

public class Popcorn {

	public Popcorn() {
		// TODO Auto-generated constructor stub
	}

	public static void main(String[] args) throws IOException {

		File file = getValidFile();

		// read and process the file
		processFile(file);
	}

	
	// read and process the file
	// generate and print the bargraph
	public static void processFile(File aFile) {
		Scanner scan = null;
		try {
			scan = new Scanner(aFile).useDelimiter("\\s*\\n");
			String aLine;
			while(scan.hasNextLine())
			{
				aLine = scan.nextLine();
				int commaIndex = aLine.indexOf(',');
				String farmName = aLine.substring(0, commaIndex);
				String lastTwo = aLine.substring(commaIndex + 1);
				lastTwo = lastTwo.trim();
				String[] lastTwoArray = lastTwo.split(" ");
				double acres = Double.parseDouble(lastTwoArray[0]);
				int jars = Integer.parseInt(lastTwoArray[1]);
				// Directly print the bargraph
				printBarGraph(farmName, acres, jars);
				// Alternative way:
				// System.out.print(generateBarGraph(farmName, acres, jars));
			}
		} catch (FileNotFoundException e1) {
			e1.printStackTrace();
		}
		if (scan != null) {
			scan.close();
		}

	}

	// Get and validate input
	// and check if file exists
	// and reprompt user if not
	// If a valid filename is given, return a file object
	public static File getValidFile() {
		Scanner in = new Scanner(System.in);
		String fileName;
		File file;
		// Get and validate input
		// and check if file exists
		// and reprompt user if not
		do {
			System.out.println("Error: Please enter a valid file name. ");
			fileName = in.next();
			file = new File(fileName);
		} while (!file.isFile());
		in.close();
		return file;
	}

	// This method prints the bar graph directly
	public static void printBarGraph(String name, double acres, int jars) {
		System.out.print(name + "\t"); // Print the farm name followed by a tab
		int stars = (int)((jars/acres)/25);
		for (int i = 0; i < stars; i++) {
			System.out.println("*");
		}
		System.out.println();
	}

	// This method produces a line for the bargraph
	// returns a formatted String for later printing.
	public static String generateBarGraph(String name, double acres, int jars) {
		String tmp = name + "\t"; // Print the farm name followed by a tab
		int stars = (int)((jars/acres)/25);
		for (int i = 0; i < stars; i++) {
			tmp = tmp + "*";
		}
		tmp = tmp + "\n";
		return tmp;
	}

	
}