/**
* Swaps the values between 2 rows. If there is no data in row #<code>pos1</code> then nothing is
* stored in row #<ocde>pos2</code>, and vice versia.
*
* @param pos1 - the row number of first item to be swaped
* @param pos2 - the row number of second item to be swaped
*/
public void swapRows(int pos1, int pos2) {
if (pos1 == pos2) {
return;
}
Object obj1 = elements.remove(pos1);
Object obj2 = elements.remove(pos2);
if (obj1 != null) {
setObject(obj1, pos2);
}
if (obj2 != null) {
setObject(obj2, pos1);
}
missing.swapRows(pos1, pos2);
empty.swapRows(pos1, pos2);
}
/**
* Sets the item at row #<code>pos</code> to be <code>newEntry</code>
*
* @param newEntry - the object to be assigned to row #<code>pos</code> param pos - the row number
* to be set.
*/
public void setObject(Object newEntry, int pos) {
elements.remove(pos);
elements.put(pos, newEntry);
}
/**
* removes a row from this column and returns the removed item as an object
*
* @param row - the row number to be removed.
* @return - the removed object.
*/
public Object removeRow(int row) {
return elements.remove(row);
}