/**
* Compared the value represented by element and the one of row number <code>pos</code>. <code>
* elements</code> will be converted to a compatible type to this column. if element > pos returns
* 1. if element < pos retruns -1. if the are equal returns 0. if one of the representation does
* not hold a value, it is considered smaller than the other.
*/
public int compareRows(Object element, int pos) {
// validating the objects to be compared
int val = validate(element, pos);
if (val <= 1) {
return val;
}
// retrieving the object from pos
Object obj = getObject(pos);
// if they are of the smae type - comparing them
if (element.getClass().equals(obj.getClass())) {
return compareObjects(element, obj);
}
// if both are numbers - comparing them as doubles.
if (element instanceof Number && obj instanceof Number) {
return SparseDoubleColumn.compareDoubles(
SparseDoubleColumn.toDouble(element), SparseDoubleColumn.toDouble(obj));
}
// they are probably not mutually comparable...
// if this is an object column, i.e. the type of the objects is unknown
// converting both of the objects into strings and comparing them
if (ColumnTypes.OBJECT == getType()) {
return SparseStringColumn.toStringObject(element)
.compareTo(SparseStringColumn.toStringObject(obj));
}
// this is not an object column - converting element to the type of this
// column, and comparing the objects.
switch (getType()) {
case (ColumnTypes.BYTE_ARRAY):
element = SparseByteArrayColumn.toByteArray(element);
break;
case (ColumnTypes.CHAR_ARRAY):
element = SparseCharArrayColumn.toCharArray(element);
break;
case (ColumnTypes.STRING):
element = SparseStringColumn.toStringObject(element);
break;
default:
break;
}
return compareObjects(element, obj);
}
/**
* If the item at pos is a Number, return its double value. Otherwise if the item is a char[] or
* any other type of Object, convert the item to a String and return its double value by calling
* Double.parseDouble()
*
* @param row the row number
* @return the double value of the item at row # row. if no such item exists returns a value
* signifying the position is empty, as defined by SparseDoubleColumn.
*/
public double getDouble(int row) {
Object obj = elements.get(row);
if (obj != null && isDataNumeric(row)) {
return SparseDoubleColumn.toDouble(obj);
}
return SparseDefaultValues.getDefaultDouble();
}