/** 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(); }
@Override public ClassDescriptor getDescriptor() { if (isAttribute()) { return null; } if (descriptor == null) { // Look first for query keys, then mappings. Ultimately we should have query keys // for everything and can dispense with the mapping part. ForeignReferenceQueryKey queryKey = (ForeignReferenceQueryKey) getQueryKeyOrNull(); if (queryKey != null) { descriptor = convertToCastDescriptor( getSession().getDescriptor(queryKey.getReferenceClass()), getSession()); return descriptor; } if (getMapping() == null) { throw QueryException.invalidQueryKeyInExpression(this); } // We assume this is either a foreign reference or an aggregate mapping descriptor = getMapping().getReferenceDescriptor(); if (getMapping().isVariableOneToOneMapping()) { throw QueryException.cannotQueryAcrossAVariableOneToOneMapping(getMapping(), descriptor); } descriptor = convertToCastDescriptor(descriptor, getSession()); } return descriptor; }