/** 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: Find the alias for a given table */
public DatabaseTable aliasForTable(DatabaseTable table) {
DatabaseMapping mapping = getMapping();
if (isAttribute()
|| ((mapping != null)
&& (mapping.isAggregateObjectMapping() || mapping.isTransformationMapping()))) {
return ((DataExpression) getBaseExpression()).aliasForTable(table);
}
// "ref" and "structure" mappings, no table printed in the FROM clause, need to get the table
// alias form the parent table
if ((mapping != null) && (mapping.isReferenceMapping() || mapping.isStructureMapping())) {
DatabaseTable alias =
getBaseExpression().aliasForTable(mapping.getDescriptor().getTables().firstElement());
alias.setName(alias.getName() + "." + mapping.getField().getName());
return alias;
}
// For direct-collection mappings the alias is store on the table expression.
if ((mapping != null) && (mapping.isDirectCollectionMapping())) {
if (tableAliases != null) {
DatabaseTable aliasedTable = tableAliases.keyAtValue(table);
if (aliasedTable != null) {
return aliasedTable;
}
}
return getTable(table).aliasForTable(table);
}
return super.aliasForTable(table);
}
/**
* INTERNAL This method iterates through a collection and gets the values from the objects to
* conform in an in-memory query. Creation date: (1/19/01 1:18:27 PM)
*/
public Object valuesFromCollection(
Object object, AbstractSession session, int valueHolderPolicy, boolean isObjectUnregistered) {
// in case the mapping is null - this can happen if a query key is being used
// In this case, check for the query key and find it's mapping.
boolean readMappingFromQueryKey = false;
if (getMapping() == null) {
getMappingFromQueryKey();
readMappingFromQueryKey = true;
}
// For bug 2780817 get the mapping directly from the object. In EJB 2.0
// inheritance, each child must override mappings defined in an abstract
// class with its own.
DatabaseMapping mapping = this.mapping;
ClassDescriptor descriptor = mapping.getDescriptor();
if (descriptor.hasInheritance() && (descriptor.getJavaClass() != object.getClass())) {
mapping =
session
.getDescriptor(object.getClass())
.getObjectBuilder()
.getMappingForAttributeName(getName());
descriptor = mapping.getDescriptor();
}
// fetch group support
if (descriptor.hasFetchGroupManager()) {
FetchGroupManager fetchGroupManager = descriptor.getFetchGroupManager();
if (fetchGroupManager.isPartialObject(object)
&& (!fetchGroupManager.isAttributeFetched(object, mapping.getAttributeName()))) {
// the conforming attribute is not fetched, simply throw exception
throw QueryException.cannotConformUnfetchedAttribute(mapping.getAttributeName());
}
}
if (mapping.isDirectToFieldMapping()) {
return ((AbstractDirectMapping) mapping).valueFromObject(object, mapping.getField(), session);
} else if (mapping.isForeignReferenceMapping()) {
// CR 3677 integration of a ValueHolderPolicy
Object valueFromMapping = mapping.getAttributeValueFromObject(object);
if (!((ForeignReferenceMapping) mapping)
.getIndirectionPolicy()
.objectIsInstantiated(valueFromMapping)) {
if (valueHolderPolicy != InMemoryQueryIndirectionPolicy.SHOULD_TRIGGER_INDIRECTION) {
// If the client wishes us to trigger the indirection then we should do so,
// Other wise throw the exception
throw QueryException
.mustInstantiateValueholders(); // you should instantiate the valueholder for this to
// work
}
// maybe we should throw this exception from the start, to save time
}
Object valueToIterate = mapping.getRealAttributeValueFromObject(object, session);
UnitOfWorkImpl uow = isObjectUnregistered ? (UnitOfWorkImpl) session : null;
// First check that object in fact is unregistered.
// toDo: ?? Why is this commented out? Why are we supporting the unregistered thing at all?
// Does not seem to be any public API for this, nor every used internally?
// if (isObjectUnregistered) {
// isObjectUnregistered = !uow.getCloneMapping().containsKey(object);
// }
if (mapping.isCollectionMapping() && (valueToIterate != null)) {
// For bug 2766379 must use the correct version of vectorFor to
// unwrap the result same time.
valueToIterate = mapping.getContainerPolicy().vectorFor(valueToIterate, session);
// toDo: If the value is empty, need to support correct inner/outer join filtering
// symantics.
// For CR 2612601, try to partially replace the result with already
// registered objects.
if (isObjectUnregistered && (uow.getCloneMapping().get(object) == null)) {
Vector objectValues = (Vector) valueToIterate;
for (int i = 0; i < objectValues.size(); i++) {
Object original = objectValues.elementAt(i);
Object clone =
uow.getIdentityMapAccessorInstance()
.getIdentityMapManager()
.getFromIdentityMap(original);
if (clone != null) {
objectValues.setElementAt(clone, i);
}
}
}
// For CR 2612601, conforming without registering, a query could be
// bob.get("address").get("city").equal("Ottawa"); where the address
// has been registered and modified in the UOW, but bob has not. Thus
// even though bob does not point to the modified address now, it will
// as soon as it is registered, so should point to it here.
} else if (isObjectUnregistered && (uow.getCloneMapping().get(object) == null)) {
Object clone =
uow.getIdentityMapAccessorInstance()
.getIdentityMapManager()
.getFromIdentityMap(valueToIterate);
if (clone != null) {
valueToIterate = clone;
}
}
return valueToIterate;
} else if (mapping.isAggregateMapping()) {
Object aggregateValue = mapping.getAttributeValueFromObject(object);
// Bug 3995468 - if this query key is to a mapping in an aggregate object, get the object from
// actual mapping rather than the aggregate mapping
while (readMappingFromQueryKey
&& mapping.isAggregateObjectMapping()
&& !((AggregateObjectMapping) mapping)
.getReferenceClass()
.equals(queryKey.getDescriptor().getJavaClass())) {
mapping =
mapping
.getReferenceDescriptor()
.getObjectBuilder()
.getMappingForField(((DirectQueryKey) queryKey).getField());
aggregateValue = mapping.getRealAttributeValueFromObject(aggregateValue, session);
}
return aggregateValue;
} else {
throw QueryException.cannotConformExpression();
}
}