/** INTERNAL: Return if the expression is for a direct mapped attribute. */
public boolean isAttribute() {
if (isAttributeExpression == null) {
if (getSession() == null) {
// We can't tell, so say no.
return false;
}
QueryKey queryKey = getQueryKeyOrNull();
if (queryKey != null) {
isAttributeExpression = Boolean.valueOf(queryKey.isDirectQueryKey());
} else {
DatabaseMapping mapping = getMapping();
if (mapping != null) {
if (mapping.isVariableOneToOneMapping()) {
throw QueryException.cannotQueryAcrossAVariableOneToOneMapping(
mapping, mapping.getDescriptor());
} else {
isAttributeExpression = Boolean.valueOf(mapping.isDirectToFieldMapping());
}
} else {
isAttributeExpression = Boolean.FALSE;
}
}
}
return isAttributeExpression.booleanValue();
}
