/**
* Returns an int to int hash map with old row numbers mapped to new row numbers, which defines a
* sorted order for this column
*
* @param validRows row numbers from which the sorted order is retrieved.
*/
public VIntIntHashMap getNewOrder(int[] validRows) {
Object[] sortedValues = getValuesInRange(validRows[0], validRows[validRows.length - 1]);
Object[] rawValues = getValues(validRows);
// will hold the new order, the returned value.
int[] newOrder = new int[validRows.length];
// a flag array. occupiedIndices[j] == true mean that the row number
// stored at validRows[j] was already mapped to a value in tempMap
boolean[] ocuupiedIndices = new boolean[validRows.length];
// for each valid row validRows[i]
for (int i = 0; i < validRows.length; i++) {
// finding the index of its mapped Object in values
int newRow = Arrays.binarySearch(sortedValues, rawValues[i]);
// because binarySearch can return the same index for items that are identical
// checking for this option too.
if (ocuupiedIndices[newRow]) {
// if newRow index was already used - finding an alternative index
newRow = getNewRow(rawValues[i], sortedValues, newRow, ocuupiedIndices);
// marking the associated flag as true
}
ocuupiedIndices[newRow] = true;
newOrder[newRow] = validRows[i];
} // end of for
return VHashService.getMappedOrder(validRows, newOrder);
}
