edu.kzoo.grid
Class BoundedGrid.Array2DGridRep

java.lang.Object
  |
  +--edu.kzoo.grid.BoundedGrid.Array2DGridRep

All Implemented Interfaces:

Grid.InternalRepresentation

Enclosing class:

BoundedGrid

protected static class BoundedGrid.Array2DGridRep

extends java.lang.Object

implements Grid.InternalRepresentation

The Array2DGridRep class represents an internal bounded grid using a two-dimensional array.

Constructor Summary

BoundedGrid.Array2DGridRep(int rows, int cols)
Constructs an empty Array2DGridRep representation with the given dimensions.

Method Summary

void	add(GridObject obj) Adds a new object to this internal grid representation 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	numCols() Returns number of columns in this grid.
int	numObjects() Returns the number of objects in this grid.
int	numRows() Returns number of rows 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 internal grid representation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BoundedGrid.Array2DGridRep

public BoundedGrid.Array2DGridRep(int rows,
                                  int cols)

Constructs an empty Array2DGridRep representation with the given dimensions. (Precondition: rows > 0 and cols > 0.)

Parameters:

rows - number of rows in the grid

cols - number of columns in the grid

Method Detail

numRows

public int numRows()

Returns number of rows in this grid.

Returns:

the number of rows, or UNBOUNDED if the grid is unbounded

numCols

public int numCols()

Returns number of columns in this grid.

Returns:

the number of columns, or UNBOUNDED if the grid is unbounded

isValid

public boolean isValid(Location loc)

Verifies whether a location is valid in this grid.

Specified by:

isValid in interface Grid.InternalRepresentation

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.

Specified by:

numObjects in interface Grid.InternalRepresentation

Returns:

the number of objects

allObjects

public GridObject[] allObjects()

Returns all the objects in this grid.

Specified by:

allObjects in interface Grid.InternalRepresentation

Returns:

an array of all the grid objects

objectAt

public GridObject objectAt(Location loc)

Returns the object at a specific location in this grid.

Specified by:

objectAt in interface Grid.InternalRepresentation

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 internal grid representation at the location it specifies. (Precondition: obj.grid() is this grid and obj.location() is a valid empty location; verified by the Grid object.)

Specified by:

add in interface Grid.InternalRepresentation

Parameters:

obj - the new object to be added

remove

public void remove(GridObject obj)

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

Specified by:

remove in interface Grid.InternalRepresentation

Parameters:

obj - the object to be removed