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package oracle.toplink.essentials.queryframework;
import java.util.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.expressions.*;
import oracle.toplink.essentials.descriptors.DescriptorEvent;
import oracle.toplink.essentials.descriptors.DescriptorEventManager;
import oracle.toplink.essentials.internal.sessions.AbstractRecord;
import oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
import oracle.toplink.essentials.descriptors.ClassDescriptor;
/**
* <p><b>Purpose</b>:
* Query used to delete a collection of objects
*
* <p><b>Responsibilities</b>:
* <ul>
* <li> Stores & retrieves the objects to delete.
* <li> Store the where clause used for the deletion.
* </ul>
*
* @author Yvon Lavoie
* @since TOPLink/Java 1.0
*/
public class DeleteAllQuery extends ModifyAllQuery {
/* Vector containing objects to be deleted, these should be removed from the identity map after deletion. */
protected Vector objects;
/**
* PUBLIC:
*/
public DeleteAllQuery() {
super();
}
/**
* PUBLIC:
* Create a new delete all query for the class specified.
*/
public DeleteAllQuery(Class referenceClass) {
super(referenceClass);
}
/**
* PUBLIC:
* Create a new delete all query for the class and the selection criteria
* specified.
*/
public DeleteAllQuery(Class referenceClass, Expression selectionCriteria) {
super(referenceClass, selectionCriteria);
}
/**
* PUBLIC:
* Return if this is a delete all query.
*/
public boolean isDeleteAllQuery() {
return true;
}
/**
* INTERNAL:
* This method has to be broken. If commit manager is not active either
* an exception should be thrown (ObjectLevelModify case), or a transaction
* should be started early and execute on parent if remote (dataModify case).
* A modify query is NEVER executed on the parent, unless remote session.
* @param unitOfWork
* @param translationRow
* @return
* @throws oracle.toplink.essentials.exceptions.DatabaseException
* @throws oracle.toplink.essentials.exceptions.OptimisticLockException
*/
public Object executeInUnitOfWork(UnitOfWorkImpl unitOfWork, AbstractRecord translationRow) throws DatabaseException, OptimisticLockException {
if (getObjects() != null) {
if (unitOfWork.isAfterWriteChangesButBeforeCommit()) {
throw ValidationException.illegalOperationForUnitOfWorkLifecycle(unitOfWork.getLifecycle(), "executeQuery(DeleteAllQuery)");
}
// This must be broken, see comment.
if (!unitOfWork.getCommitManager().isActive()) {
return unitOfWork.getParent().executeQuery(this, translationRow);
}
result = (Integer)super.execute(unitOfWork, translationRow);
return result;
} else {
return super.executeInUnitOfWork(unitOfWork, translationRow);
}
}
/**
* INTERNAL:
* Perform the work to delete a collection of objects.
* This skips the optimistic lock check and should not called for objects using locking.
* @exception DatabaseException - an error has occurred on the database.
* @return Integer the number of objects (rows) deleted.
*/
public Object executeDatabaseQuery() throws DatabaseException {
// CR# 4286
if (getObjects() != null) {
if(isExpressionQuery() && getSelectionCriteria() == null) {
// DeleteAllQuery has objects so it *must* have selectionCriteria, too
throw QueryException.deleteAllQuerySpecifiesObjectsButNotSelectionCriteria(getDescriptor(), this, getObjects().toString());
}
// Optimistic lock check not required because objects are deleted individually in that case.
try {
getSession().beginTransaction();
// Need to run pre-delete selector if available.
// PERF: Avoid events if no listeners.
if (getDescriptor().getEventManager().hasAnyEventListeners()) {
for (Enumeration deletedObjectsEnum = getObjects().elements();
deletedObjectsEnum.hasMoreElements();) {
DescriptorEvent event = new DescriptorEvent(deletedObjectsEnum.nextElement());
event.setEventCode(DescriptorEventManager.PreDeleteEvent);
event.setSession(getSession());
event.setQuery(this);
getDescriptor().getEventManager().executeEvent(event);
}
}
result = getQueryMechanism().deleteAll();
// Need to run post-delete selector if available.
// PERF: Avoid events if no listeners.
if (getDescriptor().getEventManager().hasAnyEventListeners()) {
for (Enumeration deletedObjectsEnum = getObjects().elements();
deletedObjectsEnum.hasMoreElements();) {
DescriptorEvent event = new DescriptorEvent(deletedObjectsEnum.nextElement());
event.setEventCode(DescriptorEventManager.PostDeleteEvent);
event.setSession(getSession());
event.setQuery(this);
getDescriptor().getEventManager().executeEvent(event);
}
}
if (shouldMaintainCache()) {
// remove from the cache.
for (Enumeration objectsEnum = getObjects().elements();
objectsEnum.hasMoreElements();) {
Object deleted = objectsEnum.nextElement();
if (getSession().isUnitOfWork()) {
//BUG #2612169: Unwrap is needed
deleted = getDescriptor().getObjectBuilder().unwrapObject(deleted, getSession());
((UnitOfWorkImpl)getSession()).addObjectDeletedDuringCommit(deleted, getDescriptor());
} else {
getSession().getIdentityMapAccessor().removeFromIdentityMap(deleted);
}
}
}
getSession().commitTransaction();
} catch (RuntimeException exception) {
getSession().rollbackTransaction();
throw exception;
}
} else {
result = getQueryMechanism().deleteAll();// fire the SQL to the database
mergeChangesIntoSharedCache();
}
return result;
}
/**
* INTERNAL:
* Delete all queries are executed specially to avoid cloning and ensure preparing.
*/
public void executeDeleteAll(AbstractSession session, AbstractRecord translationRow, Vector objects) throws DatabaseException {
this.checkPrepare(session, translationRow);
DeleteAllQuery queryToExecute = (DeleteAllQuery)clone();
// Then prapared for the single execution.
queryToExecute.setTranslationRow(translationRow);
queryToExecute.setSession(session);
queryToExecute.setObjects(objects);
queryToExecute.prepareForExecution();
queryToExecute.executeDatabaseQuery();
}
/**
* PUBLIC:
* Return the objects that are to be deleted
*/
public Vector getObjects() {
return objects;
}
/**
* INTERNAL:
* Prepare the receiver for execution in a session.
*/
protected void prepare() throws QueryException {
super.prepare();
if (getReferenceClass() == null) {
throw QueryException.referenceClassMissing(this);
}
if (getDescriptor() == null) {
ClassDescriptor referenceDescriptor = getSession().getDescriptor(getReferenceClass());
if (referenceDescriptor == null) {
throw QueryException.descriptorIsMissing(getReferenceClass(), this);
}
setDescriptor(referenceDescriptor);
}
if (getDescriptor().isAggregateDescriptor()) {
throw QueryException.aggregateObjectCannotBeDeletedOrWritten(getDescriptor(), this);
}
getQueryMechanism().prepareDeleteAll();
}
/**
* PUBLIC (REQUIRED):
* Set the objects to be deleted.
* Also REQUIRED is a selection criteria or SQL string that performs the deletion of the objects.
* This does not generate the SQL call from the deleted objects.
* #setObject() should not be called.
*
* Vector objects used as an indicator of one of two possible
* ways the query may behave:
* objects != null - the "old" functionality used by OneToMany mapping
* objects deleted from the cache, either selection expression or custom sql
* should be provided for deletion from db;
* objects == null - the "new" functionality (on par with UpdateAllQuery)
* the cache is either left alone or in-memory query finds the cached objects to be deleted,
* and these objects are invalidated in cache.
*
* Note that empty objects is still objects != case.
* Signal that no cache altering is required.
* Used by AggregationCollectionMapping and OneToManyMapping in case they use indirection
* and the ValueHolder has not been instantiated.
*/
public void setObjects(Vector objectCollection) {
objects = objectCollection;
}
}
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