How to define a new operator for FilterBuilder?

[svatya]

Hi,

is there a possibility in SmartGWT to define a new operator with its own "editor" for FilterBuilder?

E.g. I need some operator for timestamp which would mean "In Previous N days/weeks" and it's editor would be one number input box and one combo for period selection

I found that it's possible to restrict operators valid for DataSource field, but I did not find any way how to define my own new operator.

Something like:

[i]//////////////////////////
// Create new operator "MY_NEW_OPERATOR" and register it
/////////////////////////[/i]
...
DataSource tmpDS = new DataSource();
DataSourceField tmpField = new DataSourceField("testField");

tmpField.setValidOperators(OperatorsId.EQUALS, [b]OperatorsId.MY_NEW_OPERATOR[/b]);
tmpDS.addField(tmpField);

FilterBuilder tmpFB = new FilterBuilder();
tmpFB.setDataSource(tmpFB);

...

Thanks in advance,
Svatya.