private Object normalizeValue(Topic topic, FieldDefinition fieldDefinition, Object fieldValue) {
switch (fieldDefinition.getFieldType()) {
case FieldDefinition.FIELD_TYPE_NAME:
return ((TopicNameIF) fieldValue).getValue();
case FieldDefinition.FIELD_TYPE_IDENTITY:
return ((LocatorIF) fieldValue).getExternalForm();
case FieldDefinition.FIELD_TYPE_OCCURRENCE:
return ((OccurrenceIF) fieldValue).getValue();
case FieldDefinition.FIELD_TYPE_ROLE:
RoleField roleField = (RoleField) fieldDefinition;
RoleField.ValueIF value = (RoleField.ValueIF) fieldValue;
int arity = value.getArity();
if (arity == 2) {
for (RoleField rf : value.getRoleFields()) {
if (!rf.equals(roleField)) {
Topic valueTopic = value.getPlayer(rf, topic);
return new OntopolyTopic(session, valueTopic);
}
}
return null;
} else {
throw new RuntimeException("N-ary role fields not supported.");
}
case FieldDefinition.FIELD_TYPE_QUERY:
if (fieldValue instanceof Topic) {
return new OntopolyTopic(session, (Topic) fieldValue);
} else {
return fieldValue;
}
default:
throw new RuntimeException("Unknown field type: " + fieldDefinition);
}
}
public List<Object> getValues(PrestoField field) {
FieldDefinition fieldDefinition =
FieldDefinition.getFieldDefinition(
session.getTopicById(field.getId()), session.getTopicMap());
Collection<? extends Object> fieldValues = fieldDefinition.getValues(topic);
List<Object> result = new ArrayList<Object>(fieldValues.size());
if (fieldDefinition.getFieldType() == FieldDefinition.FIELD_TYPE_ROLE
&& ((RoleField) fieldDefinition).getAssociationField().getArity() == 1) {
result.add(!fieldValues.isEmpty());
} else {
for (Object value : fieldValues) {
result.add(normalizeValue(topic, fieldDefinition, value));
}
}
return result;
}