// Tim Hutcheson
// COP 4331 Mon. & Wed. 3:30
// Stud. ID. 999-99-9999
// Homework #4

// ShiftBuffer.java

// The ShiftBuffer class encapsulates a character array used for sequentially
// shifting the plays of the game for the purpose of time series predicition.

public class ShiftBuffer {
  
  private char[] shiftBuffer;
  
  public ShiftBuffer(int size) {
    shiftBuffer = new char[size];
    }
  
  // shift will move the shift buffer one place and insert the new move.
  public char shift(char x) {
    int i; 
    char c = shiftBuffer[0];
    for( i=1; i<shiftBuffer.length; i++ )
      shiftBuffer[i-1] = shiftBuffer[i];
    shiftBuffer[i-1] = x;
    return c;
    }
  
  public String toString() {
    return new String( shiftBuffer );
    }
  
  public void reset() {
    for( int i=0; i<shiftBuffer.length; i++ )
      shiftBuffer[i] = 0;
    }
   
  public static void main(String[] args) {
    ShiftBuffer x = new ShiftBuffer(4);
    x.shift('t');    System.out.println( x );
    x.shift('e');    System.out.println( x );
    x.shift('s');    System.out.println( x );
    x.shift('t');    System.out.println( x );
    x.shift('x');    System.out.println( x );
    }
  }