/**
* INTERNAL: This methods clones all the fields and ensures that each collection refers to the
* same clones.
*/
@Override
public Object clone() {
VariableOneToOneMapping clone = (VariableOneToOneMapping) super.clone();
Map setOfKeys = new HashMap(getSourceToTargetQueryKeyNames().size());
Map sourceToTarget = new HashMap(getSourceToTargetQueryKeyNames().size());
Vector foreignKeys =
org.eclipse.persistence.internal.helper.NonSynchronizedVector.newInstance(
getForeignKeyFields().size());
if (getTypeField() != null) {
clone.setTypeField((DatabaseField) this.getTypeField().clone());
}
for (Iterator enumtr = getSourceToTargetQueryKeyNames().keySet().iterator();
enumtr.hasNext(); ) {
// Clone the SourceKeyFields
DatabaseField field = (DatabaseField) enumtr.next();
DatabaseField clonedField = (DatabaseField) field.clone();
setOfKeys.put(field, clonedField);
// on the next line I'm cloning the query key names
sourceToTarget.put(clonedField, getSourceToTargetQueryKeyNames().get(field));
}
for (Enumeration enumtr = getForeignKeyFields().elements(); enumtr.hasMoreElements(); ) {
DatabaseField field = (DatabaseField) enumtr.nextElement();
foreignKeys.addElement(setOfKeys.get(field));
}
clone.setSourceToTargetQueryKeyFields(sourceToTarget);
clone.setForeignKeyFields(foreignKeys);
clone.setTypeIndicatorTranslation(new HashMap(this.getTypeIndicatorTranslation()));
return clone;
}
/**
* INTERNAL: Return the value of the field from the row or a value holder on the query to obtain
* the object. Check for batch + aggregation reading.
*/
@Override
public Object valueFromRow(
AbstractRecord row,
JoinedAttributeManager joinManager,
ObjectBuildingQuery sourceQuery,
AbstractSession executionSession)
throws DatabaseException {
// If any field in the foreign key is null then it means there are no referenced objects
for (Enumeration enumeration = getFields().elements(); enumeration.hasMoreElements(); ) {
DatabaseField field = (DatabaseField) enumeration.nextElement();
if (row.get(field) == null) {
return getIndirectionPolicy().nullValueFromRow();
}
}
if (getTypeField() != null) {
// If the query used batched reading, return a special value holder,
// or retrieve the object from the query property.
if (sourceQuery.isReadAllQuery()
&& (((ReadAllQuery) sourceQuery).isAttributeBatchRead(getDescriptor(), getAttributeName())
|| shouldUseBatchReading())) {
return batchedValueFromRow(row, ((ReadAllQuery) sourceQuery));
}
// If the field is empty we cannot load the object because we do not know what class it will
// be
if (row.get(getTypeField()) == null) {
return getIndirectionPolicy().nullValueFromRow();
}
Class implementerClass =
(Class) getImplementorForType(row.get(getTypeField()), executionSession);
ReadObjectQuery query = (ReadObjectQuery) getSelectionQuery().clone();
query.setReferenceClass(implementerClass);
query.setSelectionCriteria(getSelectionCriteria());
query.setDescriptor(null); // Must set to null so the right descriptor is used
if (sourceQuery.isObjectLevelReadQuery()
&& (sourceQuery.shouldCascadeAllParts()
|| (sourceQuery.shouldCascadePrivateParts() && isPrivateOwned())
|| (sourceQuery.shouldCascadeByMapping() && this.cascadeRefresh))) {
query.setShouldRefreshIdentityMapResult(sourceQuery.shouldRefreshIdentityMapResult());
query.setCascadePolicy(sourceQuery.getCascadePolicy());
query.setShouldMaintainCache(sourceQuery.shouldMaintainCache());
// For flashback.
if (((ObjectLevelReadQuery) sourceQuery).hasAsOfClause()) {
query.setAsOfClause(((ObjectLevelReadQuery) sourceQuery).getAsOfClause());
}
// CR #4365 - used to prevent infinit recursion on refresh object cascade all
query.setQueryId(sourceQuery.getQueryId());
}
return getIndirectionPolicy().valueFromQuery(query, row, executionSession);
} else {
return super.valueFromRow(row, joinManager, sourceQuery, executionSession);
}
}
/**
* PUBLIC: Return the foreign key field names associated with the mapping. These are only the
* source fields that are writable.
*/
public Vector getForeignKeyFieldNames() {
Vector fieldNames = new Vector(getForeignKeyFields().size());
for (Enumeration fieldsEnum = getForeignKeyFields().elements();
fieldsEnum.hasMoreElements(); ) {
fieldNames.addElement(((DatabaseField) fieldsEnum.nextElement()).getQualifiedName());
}
return fieldNames;
}
/** PUBLIC: Set a collection of the source to target query key/field associations. */
public void setSourceToTargetQueryKeyFieldAssociations(
Vector sourceToTargetQueryKeyFieldAssociations) {
setSourceToTargetQueryKeyFields(
new HashMap(sourceToTargetQueryKeyFieldAssociations.size() + 1));
for (Enumeration associationsEnum = sourceToTargetQueryKeyFieldAssociations.elements();
associationsEnum.hasMoreElements(); ) {
Association association = (Association) associationsEnum.nextElement();
Object sourceField = new DatabaseField((String) association.getKey());
String targetQueryKey = (String) association.getValue();
getSourceToTargetQueryKeyNames().put(sourceField, targetQueryKey);
}
}
/**
* PUBLIC: Return the foreign key field names associated with the mapping. These are only the
* source fields that are writable.
*/
public void setForeignKeyFieldNames(Vector fieldNames) {
Vector fields =
org.eclipse.persistence.internal.helper.NonSynchronizedVector.newInstance(
fieldNames.size());
for (Enumeration fieldNamesEnum = fieldNames.elements(); fieldNamesEnum.hasMoreElements(); ) {
fields.addElement(new DatabaseField((String) fieldNamesEnum.nextElement()));
}
setForeignKeyFields(fields);
if (!fields.isEmpty()) {
setIsForeignKeyRelationship(true);
}
}
/** INTERNAL: Get a value from the object and set that in the respective field of the row. */
protected void writeFromNullObjectIntoRow(AbstractRecord record) {
if (isReadOnly()) {
return;
}
if (isForeignKeyRelationship()) {
Enumeration foreignKeys = getForeignKeyFields().elements();
while (foreignKeys.hasMoreElements()) {
record.put((DatabaseField) foreignKeys.nextElement(), null);
}
}
if (getTypeField() != null) {
record.put(getTypeField(), null);
}
}
/** PUBLIC: Set the class indicator associations. */
public void setClassIndicatorAssociations(Vector classIndicatorAssociations) {
setTypeIndicatorNameTranslation(new HashMap(classIndicatorAssociations.size() + 1));
setTypeIndicatorTranslation(new HashMap((classIndicatorAssociations.size() * 2) + 1));
for (Enumeration associationsEnum = classIndicatorAssociations.elements();
associationsEnum.hasMoreElements(); ) {
Association association = (Association) associationsEnum.nextElement();
Object classValue = association.getKey();
if (classValue instanceof Class) {
// 904 projects will be a class type.
addClassIndicator((Class) association.getKey(), association.getValue());
} else {
addClassNameIndicator((String) association.getKey(), association.getValue());
}
}
}
/** INTERNAL: Get a value from the object and set that in the respective field of the row. */
@Override
public void writeFromObjectIntoRowForWhereClause(
ObjectLevelModifyQuery query, AbstractRecord record) {
if (isReadOnly()) {
return;
}
Object object;
if (query.isDeleteObjectQuery()) {
object = query.getObject();
} else {
object = query.getBackupClone();
}
Object referenceObject = getRealAttributeValueFromObject(object, query.getSession());
if (referenceObject == null) {
writeFromNullObjectIntoRow(record);
} else {
if (isForeignKeyRelationship()) {
Enumeration sourceFields = getForeignKeyFields().elements();
ClassDescriptor descriptor = query.getSession().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, query.getSession());
record.put(sourceKey, referenceValue);
}
}
if (getTypeField() != null) {
record.put(getTypeField(), getTypeForImplementor(referenceObject.getClass()));
}
}
}
/**
* 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 the value for in memory comparison. This is only valid for valueable
* expressions.
*/
public Object valueFromObject(
Object object,
AbstractSession session,
AbstractRecord translationRow,
int valueHolderPolicy,
boolean isObjectUnregistered) {
// The expression may be across a relationship, in which case it must be traversed.
if ((!getBaseExpression().isExpressionBuilder())
&& getBaseExpression().isQueryKeyExpression()) {
object =
getBaseExpression()
.valueFromObject(
object, session, translationRow, valueHolderPolicy, isObjectUnregistered);
// toDo: Null means the join filters out the row, returning null is not correct if an inner
// join,
// outer/inner joins need to be fixed to filter correctly.
if (object == null) {
return null;
}
// If from an anyof the object will be a collection of values,
// A new vector must union the object values and the values extracted from it.
if (object instanceof Vector) {
Vector comparisonVector = new Vector(((Vector) object).size() + 2);
for (Enumeration valuesToIterate = ((Vector) object).elements();
valuesToIterate.hasMoreElements(); ) {
Object vectorObject = valuesToIterate.nextElement();
if (vectorObject == null) {
comparisonVector.addElement(vectorObject);
} else {
Object valueOrValues =
valuesFromCollection(
vectorObject, session, valueHolderPolicy, isObjectUnregistered);
// If a collection of values were extracted union them.
if (valueOrValues instanceof Vector) {
for (Enumeration nestedValuesToIterate = ((Vector) valueOrValues).elements();
nestedValuesToIterate.hasMoreElements(); ) {
comparisonVector.addElement(nestedValuesToIterate.nextElement());
}
} else {
comparisonVector.addElement(valueOrValues);
}
}
}
return comparisonVector;
}
}
return valuesFromCollection(object, session, valueHolderPolicy, isObjectUnregistered);
}
