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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 |
public boolean isValid(Location loc)
loc - location to check
true if loc is valid;
false otherwisepublic int numObjects()
public GridObject[] allObjects()
public GridObject objectAt(Location loc)
loc - the location in which to look
loc;
null if loc is not
in the grid or is emptypublic void add(GridObject obj)
obj.grid() is this grid and
obj.location() is a valid empty location;
verified by the Grid object.)
obj - the new object to be addedpublic void remove(GridObject obj)
obj is in this environment; verified
by the Grid object.)
obj - the object to be removed
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