/** 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();
}
/**
* INTERNAL: Return the classification for the field contained in the mapping. This is used to
* convert the row value to a consistent java value.
*/
@Override
public Class getFieldClassification(DatabaseField fieldToClassify) {
if ((getTypeField() != null) && (fieldToClassify.equals(getTypeField()))) {
return getTypeField().getType();
}
String queryKey = (String) getSourceToTargetQueryKeyNames().get(fieldToClassify);
if (queryKey == null) {
return null;
}
// Search any of the implementor descriptors for a mapping for the query-key.
Iterator iterator =
getReferenceDescriptor().getInterfacePolicy().getChildDescriptors().iterator();
if (iterator.hasNext()) {
ClassDescriptor firstChild = (ClassDescriptor) iterator.next();
DatabaseMapping mapping = firstChild.getObjectBuilder().getMappingForAttributeName(queryKey);
if ((mapping != null) && (mapping.isDirectToFieldMapping())) {
return ((AbstractDirectMapping) mapping).getAttributeClassification();
}
QueryKey targetQueryKey = firstChild.getQueryKeyNamed(queryKey);
if ((targetQueryKey != null) && (targetQueryKey.isDirectQueryKey())) {
return firstChild
.getObjectBuilder()
.getFieldClassification(((DirectQueryKey) targetQueryKey).getField());
}
}
return null;
}