/**
* ****************************************************************** determines if a card at row
* and position is covered
*
* @exception: IllegalArgumentException if row or position is invalid
* @exception: IllegalStateException if there is no card there
*/
public boolean isCovered(PositionCard pc) {
if (pc == null) {
throw new IllegalArgumentException("Pyramid::isCovered() received null argument.");
}
return isCovered(pc.getRow(), pc.getPosition());
}
/**
* **************************************************************** Adds a PositionCard to the
* pyramid returns false if there is already a card there
*
* @exception: IllegalArgumentException if the positioncard is null
*/
public boolean addCard(PositionCard pc) {
if (pc == null) {
throw new IllegalArgumentException("Cannot add null card to pyramid");
}
int r = pc.getRow();
int p = pc.getPosition();
if (pyrArray[r][p] != null) {
return false;
}
pyrArray[r][p] = pc;
hasChanged();
return true;
}