/*
--- CSU213 Fall 2006 Lecture Notes ---------
Copyright 2006 Viera K. Proulx

Lecture 4: September 13, 2006
Designing Methods for Simple Classes
*/

/*
  +--------------+   
  | TStop        | 
  +--------------+  
  | String name  |  
  | String line  |   
  | int price    |  
  +--------------+  
*/

// to represent a subway station
class TStop {
  String name;
  String line;
  int price;       // in cents

  TStop(String name, String line, int price) {
    this.name = name;
    this.line = line;
    this.price = price;
  }

 /* TEMPLATE:
 ... this.name ...            -- String
 ... this.line ...            -- String
 ... this.price ...           -- int
 */

 // to determine whether one token is enough at this stop
 boolean oneToken(){
  return this.price == 125;
 }

 // is this station on the given line?
 boolean myLine(String line){
  return this.line.equals(line);
 }

 // is this stop on the same line as the given stop?
 boolean sameLine(TStop that){
 /* TEMPLATE:
 ... this.name ...            -- String
 ... this.line ...            -- String
 ... this.price ...           -- int

 ... that.name ...            -- String
 ... that.line ...            -- String
 ... that.price ...           -- int

 */
  return this.line.equals(that.line);
 }

 // increase the price of fare at this station by the given amount
 TStop increasePrice(int amount) {
  return new TStop(this.name, this.line, this.price + amount);
 }

 // produce the cheaper station between this one and the given one
 TStop cheaperStop(TStop that){
  if (this.price <= that.price)
   return this;
  else
   return that;  
 }

}

class ExamplesIStation{
  ExamplesIStation() {}

/*
 Harvard station on the Red line costs $1.25 to enter
 Kenmore station on the Green line costs $1.25 to enter
 Riverside station on the Green line costs $2.50 to enter
*/

 TStop harvard = new TStop("Harvard", "red", 125);
 TStop kenmore = new TStop("Kenmore", "green", 125);
 TStop riverside = new TStop("Riverside", "green", 250);

 // tests for the method oneToken in the class TStop
 boolean testOneToken = (check this.harvard.oneToken() expect true) &&
                        (check this.kenmore.oneToken() expect true) &&
                        (check this.riverside.oneToken() expect false);

 // tests for the method myLine in the class TStop
 boolean testMyLine = (check this.harvard.myLine("red") expect true) &&
                      (check this.riverside.myLine("red") expect false);

 // tests for the method sameLine in the class TStop
 boolean testSameLine = 
    (check this.harvard.sameLine(this.kenmore) expect false) &&
    (check this.riverside.sameLine(this.kenmore) expect true);

 // tests for the method increasePrice in the class TStop
 boolean testIncreasePrice = 
    (check this.harvard.increasePrice(20) 
       expect new TStop("Harvard", "red", 145)) &&
    (check this.riverside.increasePrice(50) 
       expect new TStop("Riverside", "green", 300));

 // tests for the method cheaperStop in the class TStop
 boolean testCheaperStop = 
    (check this.harvard.cheaperStop(this.kenmore) 
       expect this.harvard) &&
    (check this.riverside.cheaperStop(this.harvard) 
       expect this.harvard) &&
    (check this.kenmore.cheaperStop(this.riverside) 
       expect this.kenmore);
}