You can override GridDataSource:
So you can do something like:
This is something I did to put nulls at the bottom when a user sorts the
grid. I hope it is helpful.
@Override
public void prepare(int startIndex, int endIndex, List<SortConstraint>
sortConstraints)
{
// your own initialization code
for (SortConstraint constraint : sortConstraints)
{
final ColumnSort sort = constraint.getColumnSort();
if (sort == ColumnSort.UNSORTED) continue;
PropertyModel pm = constraint.getPropertyModel();
final PropertyConduit conduit = pm.getConduit();
Class type = pm.getPropertyType();
final Comparator valueComparator = getComparator(type); //this is
a method you can use to get the comparator you need, something that checks
if it is string and maybe some other parameters
final Comparator revValueComparator = getComparator(type);
final Comparator rowComparator = new Comparator()
{
public int compare(Object row1, Object row2)
{
Comparable value1 = (Comparable) conduit.get(row1);
Comparable value2 = (Comparable) conduit.get(row2);
return (ColumnSort.ASCENDING == sort)?
valueComparator.compare(value1, value2):
revValueComparator.compare(value1, value2);
}
};
Collections.sort(list, rowComparator); //list is the collection my
grid is sorting and is a member variable i passed in
}
}
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