/** TestInterpretInput operation by reading one of each value 

 ** supported by its public interface either from the console

 ** or a file indicated on the command line.

 **/



import java.io.FileNotFoundException;

import java.io.EOFException;

import java.io.IOException;



public class TestInputInterpreter {

  

  InputInterpreter inputSource = null;



  /** Create an InputInterpreter associated with either the

   ** console or a file whose name is given in the srgument array.

   **/

  private void setUpInput(String args[]) throws FileNotFoundException {

    if (args.length == 0) {



      // Read and interpret console input

      inputSource = new InputInterpreter();



    }

    else {



      // Read and interpret input from file indicated in args

      inputSource = new InputInterpreter(args[0]);

    }

  }



  /** Read and interpret the contents of the input source.

   **/

  private void readInput() {



    boolean doPrompts = inputSource.isConsole();



    try {

      while (true) {

        if (doPrompts)

          System.out.println("Enter a string, e.g., your name");



        // Declare a String and then ask inputSource to read a String

        // and assign it to the String object you've declared







        if (doPrompts)

          System.out.println("Enter an int, e.g., your age");



        // Declare an int and then ask inputSource to read an int

        // value and assign it to the int variable you've declared







        if (doPrompts)

          System.out.println("Enter digits for a double, e.g., taxes paid");



        // Declare a double and then ask inputSource to read a

        // double value and assign it to the double variable

        // you've declared









        // Report the String, int and double values you've read in









      }

    }

    catch (EOFException eof) {

      System.out.println("caught end of file");

    }

  }





  // Read records from the indicated file



  public int readRecords( String filename ) {



    int numRecords = 0;

    int recordsRead = 0;



    try {

      // Read and interpret input from file indicated in filename

      inputSource = new InputInterpreter(filename);



      // Assume the input file consists of an initial line that has

      // the number of records, followed by the records themselves



      numRecords = inputSource.readIntValue();



      // Now read that many records.  Each record consists of a

      // String, an int value, and a double value, each on

      // separate lines.  So the file contains

      // string

      // int 

      // double

      // string

      // int

      // double 

      // ...



      String stringVal;

      int    intVal;

      double dblVal;

      for (recordsRead = 0; recordsRead < numRecords; recordsRead++ ) {



        stringVal = inputSource.readString();

        intVal = inputSource.readIntValue();

        dblVal = inputSource.readDoubleValue();



        // do something useful with the three input items read,

        // like print them, make a new object with them ...

      }

    }

    catch (FileNotFoundException e) {

      // whoops

      return 0;                         // read 0 records

    }

    catch (EOFException e) {

      // got to end of file earlier than expected

      System.err.println("End of file after " + recordsRead + " records");

      return recordsRead;

    }

    catch (IOException e) {

      // some other unexpected problem; have it report itself

      System.err.println(e);

      return 0;

    }

    return numRecords;

  }



  public static void main( String[] args) {



    TestInputInterpreter tester = new TestInputInterpreter();



    try {

      // One of the constructors can throw a FileNotFound

      // exception; thus the need to enclose the following in a

      // try block.

      tester.setUpInput(args);

      tester.readInput();

    }

    catch (FileNotFoundException e) {

      System.out.println(e);

    }

  }

}