/**
* ****************************************************************** 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;
}
/**
* ********************************************************************* Selects a card by row and
* position Returns true if card is selected, false if not
*
* @exception: IllegalArgumentException if row or position is invalid
* @exception: IllegalStateException if another card is already selected
*/
public boolean select(int row, int position) {
if ((row > numRows) || (row <= 0)) {
throw new IllegalArgumentException("\"" + row + "\" is an invalid row number");
}
if ((position > numRows) || (position <= 0)) {
throw new IllegalArgumentException("\"" + position + "\" is an invalid position number");
}
if (isSelected()) {
throw new IllegalStateException("Cannot select more than one card");
}
if (!isCovered(row, position)) {
PositionCard pc = pyrArray[row][position];
pc.setSelected(true);
hasChanged();
selectedRow = row;
selectedPos = position;
return true;
}
return false;
}
