/** INTERNAL: Get a value from the object and set that in the respective field of the row. */
@Override
public Object valueFromObject(Object object, DatabaseField field, AbstractSession session) {
// First check if the value can be obtained from the value holder's row.
AbstractRecord referenceRow =
getIndirectionPolicy().extractReferenceRow(getAttributeValueFromObject(object));
if (referenceRow != null) {
Object value = referenceRow.get(field);
// Must ensure the classification to get a cache hit.
try {
value = session.getDatasourcePlatform().convertObject(value, getFieldClassification(field));
} catch (ConversionException e) {
throw ConversionException.couldNotBeConverted(this, getDescriptor(), e);
}
return value;
}
// 2.5.1.6 PWK. added to support batch reading on variable one to ones
Object referenceObject = getRealAttributeValueFromObject(object, session);
String queryKeyName = (String) getSourceToTargetQueryKeyNames().get(field);
ClassDescriptor objectDescriptor = session.getDescriptor(referenceObject.getClass());
DatabaseField targetField =
objectDescriptor.getObjectBuilder().getTargetFieldForQueryKeyName(queryKeyName);
if (targetField == null) {
return null;
}
return objectDescriptor
.getObjectBuilder()
.extractValueFromObjectForField(referenceObject, targetField, session);
}
/**
* INTERNAL: Compare the references of the two objects are the same, not the objects themselves.
* Used for independent relationships. This is used for testing and validation purposes.
*
* <p>Must get separate fields for the objects because we may be adding a different class to the
* attribute because of the interface
*/
@Override
protected boolean compareObjectsWithoutPrivateOwned(
Object firstObject, Object secondObject, AbstractSession session) {
Object firstPrivateObject = getRealAttributeValueFromObject(firstObject, session);
Object secondPrivateObject = getRealAttributeValueFromObject(secondObject, session);
if ((firstPrivateObject == null) && (secondPrivateObject == null)) {
return true;
}
if ((firstPrivateObject == null) || (secondPrivateObject == null)) {
return false;
}
if (firstPrivateObject.getClass() != secondPrivateObject.getClass()) {
return false;
}
Iterator targetKeys = getSourceToTargetQueryKeyNames().values().iterator();
ClassDescriptor descriptor = session.getDescriptor(firstPrivateObject.getClass());
ClassDescriptor descriptor2 = session.getDescriptor(secondPrivateObject.getClass());
while (targetKeys.hasNext()) {
String queryKey = (String) targetKeys.next();
DatabaseField field = descriptor.getObjectBuilder().getFieldForQueryKeyName(queryKey);
Object firstObjectField =
descriptor
.getObjectBuilder()
.extractValueFromObjectForField(firstPrivateObject, field, session);
DatabaseField field2 = descriptor2.getObjectBuilder().getFieldForQueryKeyName(queryKey);
Object secondObjectField =
descriptor2
.getObjectBuilder()
.extractValueFromObjectForField(secondPrivateObject, field2, session);
if (!((firstObjectField == null) && (secondObjectField == null))) {
if ((firstObjectField == null) || (secondObjectField == null)) {
return false;
}
if (!firstObjectField.equals(secondObjectField)) {
return false;
}
}
}
return true;
}
/** INTERNAL: Initialize the mapping. */
public void initialize(AbstractSession session) throws DescriptorException {
setReferenceDescriptor(session.getDescriptor(getReferenceClass()));
if (referenceDescriptor == null) {
throw DescriptorException.descriptorIsMissing(getReferenceClass().getName(), this);
}
// For bug 2730536 convert the field to be an ObjectRelationalDatabaseField.
ObjectRelationalDatabaseField field = (ObjectRelationalDatabaseField) getField();
field.setSqlType(java.sql.Types.REF);
if (referenceDescriptor instanceof ObjectRelationalDataTypeDescriptor) {
field.setSqlTypeName(
((ObjectRelationalDataTypeDescriptor) referenceDescriptor).getStructureName());
}
setField(getDescriptor().buildField(getField()));
setFields(collectFields());
// Ref mapping requires native connection in WLS as the Ref is wrapped.
getDescriptor().setIsNativeConnectionRequired(true);
}
/**
* INTERNAL: Get a value from the object and set that in the respective field of the row. If the
* mapping id target foreign key, you must only write the type into the roe, the rest will be
* updated when the object itself is written
*/
@Override
public void writeFromObjectIntoRowWithChangeRecord(
ChangeRecord changeRecord, AbstractRecord record, AbstractSession session) {
if (isReadOnly()) {
return;
}
ObjectChangeSet changeSet =
(ObjectChangeSet) ((ObjectReferenceChangeRecord) changeRecord).getNewValue();
if (changeSet == null) {
writeFromNullObjectIntoRow(record);
} else {
Object referenceObject = changeSet.getUnitOfWorkClone();
if (isForeignKeyRelationship()) {
Enumeration sourceFields = getForeignKeyFields().elements();
ClassDescriptor descriptor = session.getDescriptor(referenceObject.getClass());
while (sourceFields.hasMoreElements()) {
DatabaseField sourceKey = (DatabaseField) sourceFields.nextElement();
String targetQueryKey = (String) getSourceToTargetQueryKeyNames().get(sourceKey);
DatabaseField targetKeyField =
descriptor.getObjectBuilder().getFieldForQueryKeyName(targetQueryKey);
if (targetKeyField == null) {
throw DescriptorException.variableOneToOneMappingIsNotDefinedProperly(
this, descriptor, targetQueryKey);
}
Object referenceValue =
descriptor
.getObjectBuilder()
.extractValueFromObjectForField(referenceObject, targetKeyField, session);
record.put(sourceKey, referenceValue);
}
}
if (getTypeField() != null) {
record.put(getTypeField(), getTypeForImplementor(referenceObject.getClass()));
}
}
}
/**
* INTERNAL: Return a descriptor for the target of this mapping For normal
* ObjectReferenceMappings, we return the reference descriptor. For a VariableOneToOneMapping, the
* reference descriptor is often a descriptor for an interface and does not contain adequate
* information. As a result, we look up the descriptor for the specific class we are looking for
* Bug 2612571
*/
@Override
public ClassDescriptor getDescriptorForTarget(Object targetObject, AbstractSession session) {
return session.getDescriptor(targetObject);
}