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| author | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
|---|---|---|
| committer | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
| commit | 33613a85afc4b1481367fbe92a17ee59c240250b (patch) | |
| tree | 670b842326116b376b505ec2263878912fca97e2 /Bachelor/Prog2/Codebeispiele/1_ch09/elevatorinheritance/elevator.cpp | |
| download | Studium-33613a85afc4b1481367fbe92a17ee59c240250b.tar.gz Studium-33613a85afc4b1481367fbe92a17ee59c240250b.tar.bz2 | |
Diffstat (limited to 'Bachelor/Prog2/Codebeispiele/1_ch09/elevatorinheritance/elevator.cpp')
| -rw-r--r-- | Bachelor/Prog2/Codebeispiele/1_ch09/elevatorinheritance/elevator.cpp | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/Bachelor/Prog2/Codebeispiele/1_ch09/elevatorinheritance/elevator.cpp b/Bachelor/Prog2/Codebeispiele/1_ch09/elevatorinheritance/elevator.cpp new file mode 100644 index 0000000..26e01f4 --- /dev/null +++ b/Bachelor/Prog2/Codebeispiele/1_ch09/elevatorinheritance/elevator.cpp @@ -0,0 +1,231 @@ +// Fig. 7.42: elevator.cpp
+// Member-function definitions for class Elevator.
+#include <iostream>
+
+using std::cout;
+using std::endl;
+
+#include "elevator.h" // Elevator class definition
+#include "person.h" // Person class definition
+#include "floor.h" // Floor class definition
+
+// static constants that represent time required to travel
+// between floors and directions of the elevator
+const int Elevator::ELEVATOR_TRAVEL_TIME = 5;
+const int Elevator::UP = 0;
+const int Elevator::DOWN = 1;
+
+// constructor
+Elevator::Elevator( Floor &firstFloor, Floor &secondFloor )
+ : elevatorButton( *this ),
+ currentBuildingClockTime( 0 ),
+ moving( false ),
+ direction( UP ),
+ currentFloor( Floor::FLOOR1 ),
+ arrivalTime( 0 ),
+ floor1NeedsService( false ),
+ floor2NeedsService( false ),
+ floor1Ref( firstFloor ),
+ floor2Ref( secondFloor ),
+ passengerPtr( 0 )
+{
+ cout << "elevator created" << endl;
+
+} // end Elevator constructor
+
+// destructor
+Elevator::~Elevator()
+{
+ delete passengerPtr;
+ cout << "elevator destroyed" << endl;
+
+} // end ~Elevator destructor
+
+// give time to elevator
+void Elevator::processTime( int time )
+{
+ currentBuildingClockTime = time;
+
+ if ( moving ) // elevator is moving
+ processPossibleArrival();
+
+ else // elevator is not moving
+ processPossibleDeparture();
+
+ if ( !moving )
+ cout << "elevator at rest on floor "
+ << currentFloor << endl;
+
+} // end function processTime
+
+// when elevator is moving, determine if it should stop
+void Elevator::processPossibleArrival()
+{
+ // if elevator arrives at destination floor
+ if ( currentBuildingClockTime == arrivalTime ) {
+
+ currentFloor = // update current floor
+ ( currentFloor == Floor::FLOOR1 ?
+ Floor::FLOOR2 : Floor::FLOOR1 );
+
+ direction = // update direction
+ ( currentFloor == Floor::FLOOR1 ? UP : DOWN );
+
+ cout << "elevator arrives on floor "
+ << currentFloor << endl;
+
+ // process arrival at currentFloor
+ arriveAtFloor( currentFloor == Floor::FLOOR1 ?
+ floor1Ref : floor2Ref );
+
+ return;
+
+ } // end if
+
+ // elevator still moving
+ cout << "elevator moving "
+ << ( direction == UP ? "up" : "down" ) << endl;
+
+} // end function processPossibleArrival
+
+// determine whether elevator should move
+void Elevator::processPossibleDeparture()
+{
+ // this floor needs service?
+ bool currentFloorNeedsService =
+ currentFloor == Floor::FLOOR1 ?
+ floor1NeedsService : floor2NeedsService;
+
+ // other floor needs service?
+ bool otherFloorNeedsService =
+ currentFloor == Floor::FLOOR1 ?
+ floor2NeedsService : floor1NeedsService;
+
+ // service this floor (if needed)
+ if ( currentFloorNeedsService ) {
+ arriveAtFloor( currentFloor == Floor::FLOOR1 ?
+ floor1Ref : floor2Ref );
+
+ return;
+ }
+
+ // service other floor (if needed)
+ if ( otherFloorNeedsService )
+ prepareToLeave( true );
+
+} // end function processPossibleDeparture
+
+// arrive at a particular floor
+void Elevator::arriveAtFloor( Floor& arrivalFloor )
+{
+ moving = false; // reset state
+
+ cout << "elevator resets its button" << endl;
+ elevatorButton.resetButton();
+
+ bell.ringBell();
+
+ // notify floor that elevator has arrived
+ Person *floorPersonPtr = arrivalFloor.elevatorArrived();
+
+ door.openDoor(
+ passengerPtr, floorPersonPtr, arrivalFloor, *this );
+
+ // this floor needs service?
+ bool currentFloorNeedsService =
+ currentFloor == Floor::FLOOR1 ?
+ floor1NeedsService : floor2NeedsService;
+
+ // other floor needs service?
+ bool otherFloorNeedsService =
+ currentFloor == Floor::FLOOR1 ?
+ floor2NeedsService : floor1NeedsService;
+
+ // if this floor does not need service
+ // prepare to leave for the other floor
+ if ( !currentFloorNeedsService )
+ prepareToLeave( otherFloorNeedsService );
+
+ else // otherwise, reset service flag
+ currentFloor == Floor::FLOOR1 ?
+ floor1NeedsService = false: floor2NeedsService = false;
+
+} // end function arriveAtFloor
+
+// request service from elevator
+void Elevator::summonElevator( int floor )
+{
+ // set appropriate servicing flag
+ floor == Floor::FLOOR1 ?
+ floor1NeedsService = true : floor2NeedsService = true;
+
+} // end function summonElevator
+
+// accept a passenger
+void Elevator::passengerEnters( Person * const personPtr )
+{
+ // board passenger
+ passengerPtr = personPtr;
+
+ cout << "person " << passengerPtr->getID()
+ << " enters elevator from floor "
+ << currentFloor << endl;
+
+} // end function passengerEnters
+
+// notify elevator that passenger is exiting
+void Elevator::passengerExits()
+{
+ passengerPtr = 0;
+
+} // end function passengerExits
+
+// prepare to leave a floor
+void Elevator::prepareToLeave( bool leaving )
+{
+ // get reference to current floor
+ Floor &thisFloor =
+ currentFloor == Floor::FLOOR1 ? floor1Ref : floor2Ref;
+
+ // notify floor that elevator may be leaving
+ thisFloor.elevatorLeaving();
+
+ door.closeDoor( thisFloor );
+
+ if ( leaving ) // leave, if necessary
+ move();
+
+} // end function prepareToLeave
+
+// go to other floor
+void Elevator::move()
+{
+ moving = true; // change state
+
+ // schedule arrival time
+ arrivalTime = currentBuildingClockTime +
+ ELEVATOR_TRAVEL_TIME;
+
+ cout << "elevator begins moving "
+ << ( direction == DOWN ? "down " : "up " )
+ << "to floor "
+ << ( direction == DOWN ? '1' : '2' )
+ << " (arrives at time " << arrivalTime << ')'
+ << endl;
+
+} // end function move
+
+/**************************************************************************
+ * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and Prentice *
+ * Hall. All Rights Reserved. *
+ * *
+ * DISCLAIMER: The authors and publisher of this book have used their *
+ * best efforts in preparing the book. These efforts include the *
+ * development, research, and testing of the theories and programs *
+ * to determine their effectiveness. The authors and publisher make *
+ * no warranty of any kind, expressed or implied, with regard to these *
+ * programs or to the documentation contained in these books. The authors *
+ * and publisher shall not be liable in any event for incidental or *
+ * consequential damages in connection with, or arising out of, the *
+ * furnishing, performance, or use of these programs. *
+ *************************************************************************/
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