Expand EL-Context for some value - jsf

Question

Example in xhtml works, because #{row} is defined in p:dataTable. If I call getData not in context of p:dataTable it returns null. See Values.iterateOverDatatableValues for this situation where method returns null. How can I define row to use in my context. Possibly has datatable some functions to iterate over values so that #{row} will be defined?
Java:
#Named
#SessionScoped
class Test {
public Object getData () {
return Faces.evaluateExpressionGet("#{row.someProperty}"); //The String "#{row.someProperty}" comes from a collection.
}
}
XHTML #{row} is defined in Test.getData():
<p:dataTable value="#{bean.values}" var="row">
<p:column>
<h:outputText value="#{test.data}" />
</p:column>
</p:dataTable>
Java, #{row} is undefined:
class Values {
#Inject
Test test;
public void iterateOverDatatableValues (){
DataTable dt = Components.findComponent("datatableId");
for (Object o : dt.getValues()){
test.getData(); // <---- NULL because #{row} is not defined.
}
}
}

Answer 1

The solution was to use expressionFactory().createValueExperssion method.
private void setRowEL(Object o) {
ELContext elContext = Faces.getELContext();
ExpressionFactory expressionFactory = Faces.getApplication().getExpressionFactory();
ValueExpression aliasValueExpression = expressionFactory.createValueExpression(elContext, "#{row}", MyValue.class);
aliasValueExpression.setValue(elContext, o);
}