Parsing Input Part 2

Objectives

1. Finish parsing the input line with three more functions.

Notes

• Now that I have the line broken into pieces, I want to store those pieces in the right format.
• First I will declare class variables to hold the pieces.
• Then I will write two methods to get a piece as either an integer or a float.
  • I will need the integer type method
  • int parseInt(String s)
  • And the float float ParseFloat(string)
• I will wrap all of these in a function called ParseLine()
• And finally write a overall method called GetNextInput()

• import java.io.*;
  import java.util.Scanner;
  
  public class SalesOfCoffee{
       // the next three variables are related to the scanner.
       private static final String FILE_NAME = "coffee.csv";
       private static Scanner myScanner;
       // indicate if the scanner is valid or not.
       private static boolean validScanner = false;
       
       // so I can parse the input.
       private static String line;
       
       // class variables for each of the field of the input line
       private static int id,
                          quantity;
       private static float unitPrice,
                            totalCost; 
                            
       private static String productCategory,
                             productType,
                             productDetail,
                             size,
                             day;
                              
       public static void main(String[] args){
           int totalLines = 0;
           String firstOfLine;
        
           MakeScanner();
           if (!validScanner) {
               System.out.printf("Scanner not constructed\n");
               return;
           }
          
           // skip the titles.
           myScanner.nextLine();
          
           while(myScanner.hasNextLine()) {
               GetNextInput();
               totalLines++;    
               PrintLineReport();
           }
            
           System.out.printf("The file contains %d lines.\n",totalLines);
          
           myScanner.close();
       }
            
       private static void PrintLineReport(){
   
               System.out.printf("On %s a customer purchased ", day);  
               System.out.printf("item %d:", id);
               
               if (!size.equals("Not Defined")){
                   System.out.printf(" %s",size);
               }
               
               System.out.printf(" %s, %s, %s", productCategory, 
                                                           productType, productDetail);
               System.out.printf(" quantity %d @ $%.2f for a total of $%.2f\n", quantity, 
                                                                unitPrice, totalCost);
      }
  
      private static void GetNextInput() {
          line = myScanner.nextLine();
          //System.out.printf("Got '%s'\n", line);
  
          ParseLine();   
      }
      
      private static void MakeScanner() {
             try {
                    myScanner = new Scanner(new File(FILE_NAME));
                    validScanner = true;
             } catch (FileNotFoundException e) {
                    System.out.printf("Cound not open %s", FILE_NAME);
             }
      }
      
      // split an enter input line into the 9 components.
      private static void ParseLine() {
           
           id = IntSplitLine(); 
           quantity = IntSplitLine(); 
           
           unitPrice = FloatSplitLine(); 
           totalCost = FloatSplitLine(); 
                     
           productCategory = SplitLine();
           productType = SplitLine();
           productDetail = SplitLine();
           size = SplitLine();
           day = line; 
      }
      
      private static int IntSplitLine() {
          String part;
          int value = 0;
          
          part = SplitLine();
          value = Integer.parseInt(part);
          
          return value;
      }
     
      private static float FloatSplitLine() {
          String part;
          float value = 0;
          
          part = SplitLine();
          value = Float.parseFloat(part);
          
          return value;
      }
      
      // splits an input line into two parts based on , locations.
      private static String SplitLine() {
           String firstPart = "";
           int position = 0;
           
           position = line.indexOf(',');
           
           if (position != -1) {
               firstPart = line.substring(0, position);
               line = line.substring(position+1);
           }
                  
           return firstPart;
      }
      
  }