// Streams Lab. Solution for reading ASCII file

package sample;

import java.io.*;

/**
* The purpose of this class is to introduce two static methods
* capable to read and write a text (ASCII) file
* @@author Jeff Zhuk
*/

public class StreamsLab
{

/**
* The readFile() method reads a file into a string
* Example of usage:
String info = StreamsLab.readFile("c:/uop/test.txt");
* @param iFilename
* @return text or null if failure
*/
    public static String readFile(String iFilename)
    {
	     try
	     {
            BufferedReader in  = 
              new BufferedReader(new FileReader(iFilename));

            String text = ""; // start reading with empty string
            String line = null; // init line to read 

            while((line = in.readLine()) != null) { // end of file	
			
                text += line + "\r\n";	
                // windows line ending
                // for UNIX it would be just "\n"
            }

            return text;
	     }
	     catch (IOException e)
	     {
	         System.err.println("readFile failure: " + e);
	         return null;
	    }
   }
/**
* The writeFile() method writes a String of text into a file
* Example of usage:
boolean success = StreamsLab.writeFile("c:/uop/test.txt", "200000\r\n5.35\r\n30");
* @param iFilename
* @param iString to write into a file
* @return true if success, false if failure
* @@author Jeff Zhuk
*/
     public static boolean writeFile(
       String iFilename, String iString)
     {
         try
         {
             PrintWriter out = new PrintWriter(
               new BufferedWriter(new FileWriter(iFilename)));
             out.print(iString);
             out.flush();
             out.close();
             return true;	 // success !
         }
         catch (IOException e)
         {
             System.err.println("writeFile failure: " + e);
             return false;  // failure
         }
    }
/**
* The copyFile() method copies a file into a different location/name while using readFile() and writeFile() methods
* Example of usage:
boolean success = StreamsLab.copyFile("c:/uop/test.txt", "c:/uop/testCopy.txt");
* @param fname original filename
* @param anotherName the target filename
* @return true if success, false if failure
* @@author Jeff Zhuk
*/
    public static void copy (String fname, String anotherName)
    {
        String data = StreamsLab.readFile (fname);
        System.out.println("Successful Reading");
        StreamsLab.writeFile (anotherName, data);
        System.out.println("Successful Writing");     
    }
     /**
      * The main() method will test the readFile and writeFile methods and 
      * gives an example of parsing the text with the String.split() and Integer.parseInt() methods
      */
     public static void main(String[] args) {
    	 boolean success = StreamsLab.writeFile("c:/uop/priceRateYears.txt", "200000\r\n5.35\r\n30");
    	 System.out.println("Success of writing file is " + success);

    	 String info = StreamsLab.readFile("c:/uop/priceRateYears.txt");
    	 System.out.println(info);  
    	 
    	 // Parse the string to extract the price, rate and terms (years)
    	 
    	 String[] splits = info.split("\r\n");
    	 String priceString = splits[0];
    	 String rateString = splits[1];
    	 String termString = splits[2];
    	 int price = Integer.parseInt(priceString);
       float rate = Float.parseFloat(rateString);
       int term = Integer.parseInt(termString);
       System.out.println("Price="+price + " rate="+rate + " term="+ term + " years");
     } // end of the main() method
} 	// end of StreamsLab class

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