edu.kzoo.grid

Interface Grid.InternalRepresentation

All Known Implementing Classes:

ArrayListGrid.ArrayListGridRep, BoundedGrid.Array2DGridRep

Enclosing class:

Grid

protected static interface Grid.InternalRepresentation

The InternalRepresentation interface specifies the methods that any internal representation of the Grid class must implement.

Method Summary

Modifier and Type	Method and Description
void	add(GridObject obj) Adds a new object to this environment at the location it specifies.
GridObject[]	allObjects() Returns all the objects in this grid.
boolean	isValid(Location loc) Verifies whether a location is valid in this grid.
int	numObjects() Returns the number of objects in this grid.
GridObject	objectAt(Location loc) Returns the object at a specific location in this grid.
void	remove(GridObject obj) Removes the object from this environment.

Method Detail

isValid

boolean isValid(Location loc)

Verifies whether a location is valid in this grid.

Parameters:

loc - location to check

Returns:

true if loc is valid; false otherwise

numObjects

int numObjects()

Returns the number of objects in this grid.

Returns:

the number of objects

allObjects

GridObject[] allObjects()

Returns all the objects in this grid.

Returns:

an array of all the grid objects

objectAt

GridObject objectAt(Location loc)

Returns the object at a specific location in this grid.

Parameters:

loc - the location in which to look

Returns:

the object at location loc; null if loc is not in the grid or is empty

add

void add(GridObject obj)

Adds a new object to this environment at the location it specifies. (Precondition: obj.grid() is this grid and obj.location() is a valid empty location; verified by the Grid object.)

Parameters:

obj - the new object to be added

remove

void remove(GridObject obj)

Removes the object from this environment. (Precondition: obj is in this environment; verified by the Grid object.)

Parameters:

obj - the object to be removed