String item = getAttribute(element, SessionAttribute.ITEM.getText());
String operator = getAttribute(element, SessionAttribute.OPERATOR.getText());
String value = getAttribute(element, SessionAttribute.VALUE.getText());
String booleanOperator = getAttribute(element, SessionAttribute.BOOLEAN_OPERATOR.getText());
Operator opEnum = CollUtils.findValueOf(Operator.class, operator);
BooleanOperator boolEnum = BooleanOperator.valueOf(booleanOperator.toUpperCase());
TrackFilterElement trackFilterElement = new TrackFilterElement(filter, item,
opEnum, value, boolEnum);
filter.add(trackFilterElement);