@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;
}
/** Do any required validation for this node. Throw an exception if it's incorrect. */
public void validateNode() {
if ((getQueryKeyOrNull() == null) && (getMapping() == null)) {
throw QueryException.invalidQueryKeyInExpression(getName());
}
QueryKey queryKey = getQueryKeyOrNull();
DatabaseMapping mapping = getMapping();
Object theOneThatsNotNull = null;
boolean qkIsToMany = false;
if (queryKey != null) {
theOneThatsNotNull = queryKey;
qkIsToMany = queryKey.isManyToManyQueryKey() || queryKey.isOneToManyQueryKey();
}
boolean isNestedMapping = false;
if (mapping != null) {
// Bug 2847621 - Add Aggregate Collection to the list of valid items for outer join.
if (shouldUseOuterJoin
&& (!(mapping.isOneToOneMapping()
|| mapping.isOneToManyMapping()
|| mapping.isManyToManyMapping()
|| mapping.isAggregateCollectionMapping()
|| mapping.isDirectCollectionMapping()))) {
throw QueryException.outerJoinIsOnlyValidForOneToOneMappings(getMapping());
}
qkIsToMany = mapping.isCollectionMapping();
if (index != null) {
if (qkIsToMany) {
CollectionMapping collectionMapping = (CollectionMapping) getMapping();
if (collectionMapping.getListOrderField() != null) {
index.setField(collectionMapping.getListOrderField());
if (collectionMapping.shouldUseListOrderFieldTableExpression()) {
Expression newBase = getTable(collectionMapping.getListOrderField().getTable());
index.setBaseExpression(newBase);
} else {
addDerivedField(index);
}
} else {
throw QueryException.indexRequiresCollectionMappingWithListOrderField(
this, collectionMapping);
}
} else {
throw QueryException.indexRequiresCollectionMappingWithListOrderField(this, mapping);
}
}
isNestedMapping = mapping.isNestedTableMapping();
theOneThatsNotNull = mapping;
} else {
if (index != null) {
throw QueryException.indexRequiresCollectionMappingWithListOrderField(this, null);
}
}
if ((!shouldQueryToManyRelationship()) && qkIsToMany && (!isNestedMapping)) {
throw QueryException.invalidUseOfToManyQueryKeyInExpression(theOneThatsNotNull);
}
if (shouldQueryToManyRelationship() && !qkIsToMany) {
throw QueryException.invalidUseOfAnyOfInExpression(theOneThatsNotNull);
}
}
public QueryKey getQueryKeyOrNull() {
if (!hasQueryKey) {
return null;
}
// Oct 19, 2000 JED
// Added try/catch. This was throwing a NPE in the following case
// expresssionBuilder.get("firstName").get("bob")
// moved by Gordon Yorke to cover validate and normalize
if (getContainingDescriptor() == null) {
throw QueryException.invalidQueryKeyInExpression(getName());
}
if (queryKey == null) {
queryKey = getContainingDescriptor().getQueryKeyNamed(getName());
if (queryKey == null) {
hasQueryKey = false;
}
}
return queryKey;
}