com.collegeboard.gridworld.grid
Class UnboundedGrid<E>

java.lang.Object
  com.collegeboard.gridworld.grid.UnboundedGrid<E>

All Implemented Interfaces:

Grid<E>

public class UnboundedGrid<E>
extends Object
implements Grid<E>

Constructor Summary

UnboundedGrid()
Constructs an empty grid

Method Summary

E	get(Location loc) Returns the object at a specific location in this grid
ArrayList<Location>	getOccupiedLocations() Gets the locations in this grid that contain objects.
boolean	isValid(Location loc) Checks whether a location is valid in this grid.
int	numCols() Returns number of columns in this grid.
int	numRows() Returns number of rows in this grid.
E	put(Location loc, E obj) Adds a new object to this grid.
E	remove(Location loc) Removes an object from this grid.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

UnboundedGrid

public UnboundedGrid()

Constructs an empty grid

Method Detail

numRows

public int numRows()

Description copied from interface: Grid

Returns number of rows in this grid.

Specified by:

numRows in interface Grid<E>

Returns:

the number of rows, or -1 if the grid is unbounded

numCols

public int numCols()

Description copied from interface: Grid

Returns number of columns in this grid.

Specified by:

numCols in interface Grid<E>

Returns:

the number of columns, or -1 if the grid is unbounded

isValid

public boolean isValid(Location loc)

Description copied from interface: Grid

Checks whether a location is valid in this grid.

Specified by:

isValid in interface Grid<E>

Parameters:

loc - location to check (must not be null)

Returns:

true if loc is valid in this grid; false otherwise

getOccupiedLocations

public ArrayList<Location> getOccupiedLocations()

Description copied from interface: Grid

Gets the locations in this grid that contain objects.

Specified by:

getOccupiedLocations in interface Grid<E>

Returns:

an array of all occupied locations in this grid

get

public E get(Location loc)

Description copied from interface: Grid

Returns the object at a specific location in this grid

Specified by:

get in interface Grid<E>

Parameters:

loc - the location in which to look (must be valid)

Returns:

the object at location loc; null if loc is empty

put

public E put(Location loc,
             E obj)

Description copied from interface: Grid

Adds a new object to this grid.

Specified by:

put in interface Grid<E>

Parameters:

loc - the location at which to put the object (must be valid)

obj - the new object to be added (must not be null)

Returns:

the object that was removed, or null if the location was previously unoccupied.

remove

public E remove(Location loc)

Description copied from interface: Grid

Removes an object from this grid.

Specified by:

remove in interface Grid<E>

Parameters:

loc - the location of the object that is to be removed (must be valid)

Returns:

the object that was removed, or null if no object was in the given location

toString

public String toString()

Overrides:

toString in class Object