| Returns the current value for the data source. The method will return null, if no datasource or no resource bundle
is defined or if the datasource's value is null.
The value read from the dataSource is looked up in the given resourcebundle using the
ResourceBundle.getObject() method. If the lookup fails, null is returned.
Parameters: runtime - the expression runtime that is used to evaluate formulas and expressions when computing the value ofthis filter. the value or null, if the value could not be looked up. |