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dynamic rowclasses

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I have a datatable that I want to set the rowclasses based on data that is in the rows
for example: if a hava a column named number and the first one is 5 I want that row to be style class1. If the next row matches that number I want it to have the same rowclass(class1) if the number is different say 8 I want it to have a different rowclass (class2) so that all consequtive numbers have the same rowclass. My problem is not with the logic but rather with setting the rowclass.

The following method is in a column in my datatable

* @return Returns the rowClass.
public String getRowClass() {

String s = String.valueOf(getValue("#{varPerson['NUM']}"));

if (s != null && (s.compareTo(getNewCcn())==0)) {

} else {

}else if(rowClass.compareTo("rowClass2")==0){


return rowClass;
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