edu.kzoo.grid
Interface Grid.InternalRepresentation

All Known Implementing Classes:

ArrayListGrid.ArrayListGridRep, BoundedGrid.Array2DGridRep

Enclosing interface:

Grid

protected static interface Grid.InternalRepresentation

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

Method Summary

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

public 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

public int numObjects()

Returns the number of objects in this grid.

Returns:

the number of objects

allObjects

public GridObject[] allObjects()

Returns all the objects in this grid.

Returns:

an array of all the grid objects

objectAt

public 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

public 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

public 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