VL-Programmieren/VL12/Aufgabe01/Aufgabe01.java

package VL12.Aufgabe01;

import java.io.FileWriter;
import java.util.Random;

/**
 * Vorlesung 12 - Ein- und Ausgabe - Aufgabe 1
 * @author Sebastian Brosch
 */
public class Aufgabe01 {
  public static void main(String[] args) {
    final String COLUMN_SEPARATOR = "#";
    int cntDataSets = 0;
    int startKundennummer = 0;

    try {
      System.out.print("Anzahl der Datensätze: ");
      cntDataSets = Integer.parseInt(System.console().readLine());
    } catch(NumberFormatException e) {
      System.out.println("Es wurde keine gültige Anzahl für Datensätze angegeben!");
      return;
    }

    try {
      System.out.print("Startwert für Kundennummer: ");
      startKundennummer = Integer.parseInt(System.console().readLine());
    } catch(NumberFormatException e) {
      System.out.println("Es wurde keine gültige Startnummer für die Kundennummer angegeben!");
      return;
    }

    // the customer number have to be at least six digits.
    if(startKundennummer < 100000) {
      startKundennummer += 100000;
    }

    StringFeld namen = new StringFeld(getPathFromPackage() + "/input/Nachnamen.TXT");
    StringFeld strassen = new StringFeld(getPathFromPackage() + "/input/Strassen.TXT");
    StringFeld vornamen = new StringFeld(getPathFromPackage() + "/input/Vornamen.TXT");
    StringFeld postleitzahlen = new StringFeld(getPathFromPackage() + "/input/PLZOrt.TXT", " ", 0);
    StringFeld orte = new StringFeld(getPathFromPackage() + "/input/PLZOrt.TXT", " ", 1);

    try {
      FileWriter outputFixedWidth = new FileWriter(getPathFromPackage() + "/output/output-fixed-width.txt");
      FileWriter outputSeparator = new FileWriter(getPathFromPackage() + "/output/output-separator.txt");

      for(int i = 0; i < cntDataSets; i++) {
        int kundennummer = startKundennummer + i;
        int hausnummer = getRandomNumber(1, 99999);
        int umsatz = getRandomNumber(500, 2000);

        outputFixedWidth.write(String.format("%-6d", kundennummer));
        outputFixedWidth.write(String.format("%-20s", namen.get(i, 20)));
        outputFixedWidth.write(String.format("%-20s", vornamen.get(i, 20)));
        outputFixedWidth.write(String.format("%-20s", strassen.get(i, 20)));
        outputFixedWidth.write(String.format("%-5s", hausnummer));
        outputFixedWidth.write(String.format("%-5s", postleitzahlen.get(i)));
        outputFixedWidth.write(String.format("%-20s", orte.get(i, 20)));
        outputFixedWidth.write(String.format("%-5s", umsatz));
        outputFixedWidth.write("\n");

        outputSeparator.write(String.format("%d" + COLUMN_SEPARATOR, kundennummer));
        outputSeparator.write(String.format("%s" + COLUMN_SEPARATOR, namen.get(i)));
        outputSeparator.write(String.format("%s" + COLUMN_SEPARATOR, vornamen.get(i)));
        outputSeparator.write(String.format("%s" + COLUMN_SEPARATOR, strassen.get(i)));
        outputSeparator.write(String.format("%d" + COLUMN_SEPARATOR, hausnummer));
        outputSeparator.write(String.format("%s" + COLUMN_SEPARATOR, postleitzahlen.get(i)));
        outputSeparator.write(String.format("%s" + COLUMN_SEPARATOR, orte.get(i)));
        outputSeparator.write(String.format("%d", umsatz));
        outputSeparator.write("\n");
      }

      outputFixedWidth.close();
      outputSeparator.close();
    } catch(Throwable e) {;}
  }

  /**
   * Method to determine a random number from a certain range.
   * @param start The first number of the range.
   * @param end The last number of the range.
   * @return A random number from a certain range.
   */
  private static int getRandomNumber(int start, int end) {
    return (new Random()).nextInt(end-start) + start;
  }

  /**
   * Method to get the relative path based on the package name.
   * @return The relative path of the package based on the package name.
   */
  private static String getPathFromPackage() {
    return Aufgabe01.class.getPackageName().replace(".", "/");
  }
}