org.eclipse.persistence.mappings.DirectMapMapping Maven / Gradle / Ivy
Show all versions of eclipselink Show documentation
/*
* Copyright (c) 1998, 2021 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation from Oracle TopLink
// 07/19/2011-2.2.1 Guy Pelletier
// - 338812: ManyToMany mapping in aggregate object violate integrity constraint on deletion
// // 30/05/2012-2.4 Guy Pelletier
// - 354678: Temp classloader is still being used during metadata processing
package org.eclipse.persistence.mappings;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.eclipse.persistence.descriptors.changetracking.ChangeTracker;
import org.eclipse.persistence.descriptors.changetracking.CollectionChangeEvent;
import org.eclipse.persistence.descriptors.changetracking.MapChangeEvent;
import org.eclipse.persistence.exceptions.DatabaseException;
import org.eclipse.persistence.exceptions.DescriptorException;
import org.eclipse.persistence.exceptions.ValidationException;
import org.eclipse.persistence.expressions.Expression;
import org.eclipse.persistence.expressions.ExpressionBuilder;
import org.eclipse.persistence.indirection.IndirectCollection;
import org.eclipse.persistence.indirection.ValueHolder;
import org.eclipse.persistence.internal.descriptors.DescriptorIterator;
import org.eclipse.persistence.internal.descriptors.ObjectBuilder;
import org.eclipse.persistence.internal.descriptors.changetracking.AttributeChangeListener;
import org.eclipse.persistence.internal.descriptors.changetracking.ObjectChangeListener;
import org.eclipse.persistence.internal.expressions.SQLDeleteStatement;
import org.eclipse.persistence.internal.expressions.SQLSelectStatement;
import org.eclipse.persistence.internal.helper.ClassConstants;
import org.eclipse.persistence.internal.helper.DatabaseField;
import org.eclipse.persistence.internal.helper.Helper;
import org.eclipse.persistence.internal.identitymaps.CacheKey;
import org.eclipse.persistence.internal.indirection.TransparentIndirectionPolicy;
import org.eclipse.persistence.internal.queries.ContainerPolicy;
import org.eclipse.persistence.internal.queries.JoinedAttributeManager;
import org.eclipse.persistence.internal.queries.MappedKeyMapContainerPolicy;
import org.eclipse.persistence.internal.sessions.AbstractRecord;
import org.eclipse.persistence.internal.sessions.AbstractSession;
import org.eclipse.persistence.internal.sessions.ChangeRecord;
import org.eclipse.persistence.internal.sessions.DirectMapChangeRecord;
import org.eclipse.persistence.internal.sessions.MergeManager;
import org.eclipse.persistence.internal.sessions.ObjectChangeSet;
import org.eclipse.persistence.internal.sessions.UnitOfWorkImpl;
import org.eclipse.persistence.mappings.converters.Converter;
import org.eclipse.persistence.mappings.converters.ObjectTypeConverter;
import org.eclipse.persistence.mappings.converters.SerializedObjectConverter;
import org.eclipse.persistence.mappings.converters.TypeConversionConverter;
import org.eclipse.persistence.mappings.foundation.MapComponentMapping;
import org.eclipse.persistence.queries.DataReadQuery;
import org.eclipse.persistence.queries.DatabaseQuery;
import org.eclipse.persistence.queries.DeleteObjectQuery;
import org.eclipse.persistence.queries.DirectReadQuery;
import org.eclipse.persistence.queries.ObjectBuildingQuery;
import org.eclipse.persistence.queries.ReadAllQuery;
import org.eclipse.persistence.queries.WriteObjectQuery;
import org.eclipse.persistence.sessions.DatabaseRecord;
/**
* Mapping for a collection of key-value pairs.
* The key and value must be simple types (String, Number, Date, etc.)
* and stored in a single table along with a foreign key to the source object.
* A converter can be used on the key and value if the desired object types
* do not match the data types.
*
* @see Converter
* @see ObjectTypeConverter
* @see TypeConversionConverter
* @see SerializedObjectConverter
*
* @author Steven Vo
* @since TopLink 3.5
*/
public class DirectMapMapping extends DirectCollectionMapping implements MapComponentMapping {
/**
* DirectMapCollectionMapping constructor
*/
public DirectMapMapping() {
super();
DataReadQuery query = new DataReadQuery();
this.selectionQuery = query;
MappedKeyMapContainerPolicy mapPolicy = new MappedKeyMapContainerPolicy(ClassConstants.Hashtable_Class);
mapPolicy.setValueMapping(this);
this.containerPolicy = mapPolicy;
this.isListOrderFieldSupported = false;
}
/**
* ADVANCED:
* Configure the mapping to use a container policy.
* This must be a MappedKeyMapContainerPolicy policy.
* Set the valueMapping for the policy.
*/
@Override
public void setContainerPolicy(ContainerPolicy containerPolicy) {
super.setContainerPolicy(containerPolicy);
((MappedKeyMapContainerPolicy)containerPolicy).setValueMapping(this);
}
private MappedKeyMapContainerPolicy getMappedKeyMapContainerPolicy(){
return (MappedKeyMapContainerPolicy)containerPolicy;
}
/**
* PUBLIC:
* Return the converter on the mapping.
* A converter can be used to convert between the key's object value and database value.
*/
public Converter getKeyConverter() {
return getMappedKeyMapContainerPolicy().getKeyConverter();
}
/**
* PUBLIC:
* Set the converter on the mapping.
* A converter can be used to convert between the key's object value and database value.
*/
public void setKeyConverter(Converter keyConverter) {
getMappedKeyMapContainerPolicy().setKeyConverter(keyConverter, this);
}
/**
* INTERNAL:
* Set the converter class name on the mapping. Initialized in
* convertClassNamesToClasses.
* A converter can be used to convert between the key's object value and database value.
*/
public void setKeyConverterClassName(String keyConverterClassName) {
getMappedKeyMapContainerPolicy().setKeyConverterClassName(keyConverterClassName, this);
}
/**
* INTERNAL:
* Add a new value and its change set to the collection change record. This is used by
* attribute change tracking. If a value has changed then issue a remove first with the key
* then an add.
*/
public void addToCollectionChangeRecord(Object newKey, Object newValue, ObjectChangeSet objectChangeSet, UnitOfWorkImpl uow) throws DescriptorException {
DirectMapChangeRecord collectionChangeRecord = (DirectMapChangeRecord)objectChangeSet.getChangesForAttributeNamed(this.getAttributeName());
if (collectionChangeRecord == null) {
collectionChangeRecord = new DirectMapChangeRecord(objectChangeSet);
collectionChangeRecord.setAttribute(getAttributeName());
collectionChangeRecord.setMapping(this);
objectChangeSet.addChange(collectionChangeRecord);
}
collectionChangeRecord.addAdditionChange(newKey, newValue);
}
/**
* INTERNAL:
* Require for cloning, the part must be cloned.
* Ignore the objects, use the attribute value.
*/
@Override
public Object buildCloneForPartObject(Object attributeValue, Object original, CacheKey cacheKey, Object clone, AbstractSession cloningSession, Integer refreshCascade, boolean isExisting, boolean isFromSharedCache) {
if (attributeValue == null) {
return containerPolicy.containerInstance(1);
}
Object clonedAttributeValue = containerPolicy.containerInstance(containerPolicy.sizeFor(attributeValue));
// I need to synchronize here to prevent the collection from changing while I am cloning it.
// This will occur when I am merging into the cache and I am instantiating a UOW valueHolder at the same time
// I can not synchronize around the clone, as this will cause deadlocks, so I will need to copy the collection then create the clones
// I will use a temporary collection to help speed up the process
Object temporaryCollection = null;
synchronized (attributeValue) {
temporaryCollection = containerPolicy.cloneFor(attributeValue);
}
for (Object keysIterator = containerPolicy.iteratorFor(temporaryCollection);
containerPolicy.hasNext(keysIterator);) {
Map.Entry entry = (Map.Entry)containerPolicy.nextEntry(keysIterator, cloningSession);
Object cloneKey = containerPolicy.buildCloneForKey(entry.getKey(), clone, cacheKey, null, cloningSession, isExisting, isFromSharedCache);
Object cloneValue = buildElementClone(entry.getValue(), clone, cacheKey, refreshCascade, cloningSession, isExisting, isFromSharedCache);
containerPolicy.addInto(cloneKey, cloneValue, clonedAttributeValue, cloningSession);
}
return clonedAttributeValue;
}
/**
* INTERNAL:
* Used by AttributeLevelChangeTracking to update a changeRecord with calculated changes
* as opposed to detected changes. If an attribute can not be change tracked it's
* changes can be detected through this process.
*/
@Override
public void calculateDeferredChanges(ChangeRecord changeRecord, AbstractSession session) {
DirectMapChangeRecord collectionRecord = (DirectMapChangeRecord)changeRecord;
// TODO: Handle events that fired after collection was replaced.
compareCollectionsForChange(collectionRecord.getOriginalCollection(), collectionRecord.getLatestCollection(), collectionRecord, session);
}
/**
* INTERNAL:
* Cascade discover and persist new objects during commit.
*/
@Override
public void cascadeDiscoverAndPersistUnregisteredNewObjects(Object object, Map newObjects, Map unregisteredExistingObjects, Map visitedObjects, UnitOfWorkImpl uow, Set cascadeErrors) {
if (containerPolicy.isMappedKeyMapPolicy()){
Object values = getAttributeValueFromObject(object);
if (values != null){
Object iterator = containerPolicy.iteratorFor(values);
while (containerPolicy.hasNext(iterator)){
Object wrappedObject = containerPolicy.nextEntry(iterator, uow);
containerPolicy.cascadeDiscoverAndPersistUnregisteredNewObjects(wrappedObject, newObjects, unregisteredExistingObjects, visitedObjects, uow, cascadeErrors);
}
}
}
}
/**
* INTERNAL:
* Cascade perform delete through mappings that require the cascade
*/
@Override
public void cascadePerformRemoveIfRequired(Object object, UnitOfWorkImpl uow, Map visitedObjects) {
if (containerPolicy.isMappedKeyMapPolicy()){
Object values = getAttributeValueFromObject(object);
if (values != null){
Object iterator = containerPolicy.iteratorFor(values);
while (containerPolicy.hasNext(iterator)){
Object wrappedObject = containerPolicy.nextEntry(iterator, uow);
containerPolicy.cascadePerformRemoveIfRequired(wrappedObject, uow, visitedObjects);
}
}
}
}
/**
* INTERNAL:
* Cascade registerNew for Create through mappings that require the cascade
*/
@Override
public void cascadeRegisterNewIfRequired(Object object, UnitOfWorkImpl uow, Map visitedObjects) {
if (containerPolicy.isMappedKeyMapPolicy()){
Object values = getAttributeValueFromObject(object);
if (values != null){
Object iterator = containerPolicy.iteratorFor(values);
while (containerPolicy.hasNext(iterator)){
Object wrappedObject = containerPolicy.nextEntry(iterator, uow);
containerPolicy.cascadeRegisterNewIfRequired(wrappedObject, uow, visitedObjects);
}
}
}
}
/**
* INTERNAL:
* This method is used to calculate the differences between two collections.
*/
@Override
public void compareCollectionsForChange(Object oldCollection, Object newCollection, ChangeRecord changeRecord, AbstractSession session) {
HashMap originalKeyValues = new HashMap(10);
HashMap cloneKeyValues = new HashMap(10);
if (oldCollection != null) {
Map backUpCollection = (Map)oldCollection;
Object backUpIter = containerPolicy.iteratorFor(backUpCollection);
while (containerPolicy.hasNext(backUpIter)) {// Make a lookup of the objects
Map.Entry entry = (Map.Entry)containerPolicy.nextEntry(backUpIter, session);
originalKeyValues.put(entry.getKey(), backUpCollection.get(entry.getKey()));
}
}
Map cloneObjectCollection = (Map)newCollection;
Object cloneIter = containerPolicy.iteratorFor(cloneObjectCollection);
while (containerPolicy.hasNext(cloneIter)) {//Compare them with the objects from the clone
Map.Entry wrappedFirstObject = (Map.Entry)containerPolicy.nextEntry(cloneIter, session);
Object firstValue = wrappedFirstObject.getValue();
Object firstKey = wrappedFirstObject.getKey();
Object backupValue = originalKeyValues.get(firstKey);
if (!originalKeyValues.containsKey(firstKey)) {
cloneKeyValues.put(firstKey, cloneObjectCollection.get(firstKey));
} else if (((backupValue == null) && (firstValue != null)) || (!backupValue.equals(firstValue))) {//the object was not in the backup
cloneKeyValues.put(firstKey, cloneObjectCollection.get(firstKey));
} else {
originalKeyValues.remove(firstKey);
}
}
((DirectMapChangeRecord)changeRecord).clearChanges();
((DirectMapChangeRecord)changeRecord).addAdditionChange(cloneKeyValues);
((DirectMapChangeRecord)changeRecord).addRemoveChange(originalKeyValues);
((DirectMapChangeRecord)changeRecord).setIsDeferred(false);
((DirectMapChangeRecord)changeRecord).setLatestCollection(null);
}
/**
* INTERNAL:
* This method compares the changes between two direct collections. Comparisons are made on equality
* not identity.
*/
@Override
public ChangeRecord compareForChange(Object clone, Object backUp, ObjectChangeSet owner, AbstractSession session) {
Object cloneAttribute = null;
Object backUpAttribute = null;
cloneAttribute = getAttributeValueFromObject(clone);
if ((cloneAttribute != null) && (!getIndirectionPolicy().objectIsInstantiated(cloneAttribute))) {
return null;
}
Map cloneObjectCollection = (Map)getRealCollectionAttributeValueFromObject(clone, session);
Map backUpCollection = null;
if (!owner.isNew()) {
backUpAttribute = getAttributeValueFromObject(backUp);
if ((backUpAttribute == null) && (cloneAttribute == null)) {
return null;
}
backUpCollection = (Map)getRealCollectionAttributeValueFromObject(backUp, session);
}
DirectMapChangeRecord changeRecord = new DirectMapChangeRecord(owner);
changeRecord.setAttribute(getAttributeName());
changeRecord.setMapping(this);
compareCollectionsForChange(backUpCollection, cloneObjectCollection, changeRecord, session);
if (changeRecord.hasChanges()) {
changeRecord.setOriginalCollection(backUpCollection);
return changeRecord;
}
return null;
}
/**
* INTERNAL:
* Compare the attributes belonging to this mapping for the objects.
*/
@Override
public boolean compareObjects(Object firstObject, Object secondObject, AbstractSession session) {
Object firstObjectMap = getRealCollectionAttributeValueFromObject(firstObject, session);
Object secondObjectMap = getRealCollectionAttributeValueFromObject(secondObject, session);
return getMappedKeyMapContainerPolicy().compareContainers(firstObjectMap, secondObjectMap);
}
/*
* INTERNAL:
* Convert all the class-name-based settings in this mapping to actual
* class-based settings. This method is implemented by subclasses as
* necessary.
* @param classLoader
*/
@Override
public void convertClassNamesToClasses(ClassLoader classLoader) {
super.convertClassNamesToClasses(classLoader);
if (getDirectKeyField() != null) {
getDirectKeyField().convertClassNamesToClasses(classLoader);
}
}
/**
* INTERNAL
* Called when a DatabaseMapping is used to map the key in a collection. Returns the key.
*/
@Override
public Object createMapComponentFromRow(AbstractRecord dbRow, ObjectBuildingQuery query, CacheKey parentCacheKey, AbstractSession session, boolean isTargetProtected){
Object key = dbRow.get(getDirectField());
if (getValueConverter() != null){
key = getValueConverter().convertDataValueToObjectValue(key, session);
}
return key;
}
/**
* INTERNAL:
*/
public DatabaseField getDirectKeyField() {
return getMappedKeyMapContainerPolicy().getDirectKeyField(null);
}
/**
* INTERNAL:
* Initialize and validate the mapping properties.
*/
@Override
public void initialize(AbstractSession session) throws DescriptorException {
getMappedKeyMapContainerPolicy().setDescriptorForKeyMapping(this.getDescriptor());
if (getKeyConverter() != null) {
getKeyConverter().initialize(this, session);
}
super.initialize(session);
}
@Override
protected void initializeDeleteQuery(AbstractSession session) {
if (!getDeleteQuery().hasSessionName()) {
getDeleteQuery().setSessionName(session.getName());
}
if (hasCustomDeleteQuery()) {
return;
}
Expression builder = new ExpressionBuilder();
Expression directKeyExp = null;
List identityFields = getContainerPolicy().getIdentityFieldsForMapKey();
Iterator i = identityFields.iterator();
while (i.hasNext()){
DatabaseField field = i.next();
Expression fieldExpression = builder.getField(field).equal(builder.getParameter(field));
if (directKeyExp == null){
directKeyExp = fieldExpression;
} else {
directKeyExp = directKeyExp.and(fieldExpression);
}
}
Expression expression = null;
SQLDeleteStatement statement = new SQLDeleteStatement();
// Construct an expression to delete from the relation table.
for (int index = 0; index < getReferenceKeyFields().size(); index++) {
DatabaseField referenceKey = getReferenceKeyFields().get(index);
DatabaseField sourceKey = getSourceKeyFields().get(index);
Expression subExp1 = builder.getField(referenceKey);
Expression subExp2 = builder.getParameter(sourceKey);
Expression subExpression = subExp1.equal(subExp2);
expression = subExpression.and(expression);
}
expression = expression.and(directKeyExp);
statement.setWhereClause(expression);
statement.setTable(getReferenceTable());
getDeleteQuery().setSQLStatement(statement);
}
/**
* Initialize insert query. This query is used to insert the collection of objects into the
* reference table.
*/
@Override
protected void initializeInsertQuery(AbstractSession session) {
super.initializeInsertQuery(session);
getContainerPolicy().addFieldsForMapKey(getInsertQuery().getModifyRow());
}
@Override
protected void initializeSelectionStatement(AbstractSession session) {
if (this.selectionQuery.isReadAllQuery()){
((ReadAllQuery)this.selectionQuery).addAdditionalField(getDirectField().clone());
} else {
SQLSelectStatement statement = (SQLSelectStatement)this.selectionQuery.getSQLStatement();
statement.addTable(getReferenceTable());
statement.addField(getDirectField().clone());
getContainerPolicy().addAdditionalFieldsToQuery(this.selectionQuery, getAdditionalFieldsBaseExpression(this.selectionQuery));
statement.normalize(session, null);
}
if (this.selectionQuery.isDirectReadQuery()){
((DirectReadQuery)this.selectionQuery).setResultType(DataReadQuery.MAP);
}
}
/**
* INTERNAL:
* Iterate on the attribute value.
* The value holder has already been processed.
* PERF: Avoid iteration if not required.
*/
@Override
public void iterateOnRealAttributeValue(DescriptorIterator iterator, Object realAttributeValue) {
super.iterateOnRealAttributeValue(iterator, realAttributeValue);
ContainerPolicy cp = getContainerPolicy();
if (realAttributeValue != null && !iterator.shouldIterateOnPrimitives()) {
for (Object iter = cp.iteratorFor(realAttributeValue); cp.hasNext(iter);) {
Object wrappedObject = cp.nextEntry(iter, iterator.getSession());
cp.iterateOnMapKey(iterator, wrappedObject);
}
}
}
/**
* INTERNAL:
* Iterate on the specified element.
*/
@Override
public void iterateOnElement(DescriptorIterator iterator, Object element) {
super.iterateOnElement(iterator, element);
ContainerPolicy cp = getContainerPolicy();
for (Object iter = cp.iteratorFor(element); cp.hasNext(iter);) {
Object wrappedObject = cp.nextEntry(iter, iterator.getSession());
cp.iterateOnMapKey(iterator, wrappedObject);
}
}
/**
* INTERNAL:
* Related mapping should implement this method to return true.
*/
@Override
public boolean isDirectMapMapping() {
return true;
}
/**
* INTERNAL:
* Merge changes from the source to the target object.
* Because this is a collection mapping, values are added to or removed from the
* collection based on the changeset.
*/
@Override
public void mergeChangesIntoObject(Object target, ChangeRecord changeRecord, Object source, MergeManager mergeManager, AbstractSession targetSession) {
if (this.descriptor.getCachePolicy().isProtectedIsolation()&& !this.isCacheable && !targetSession.isProtectedSession()){
setAttributeValueInObject(target, this.indirectionPolicy.buildIndirectObject(new ValueHolder(null)));
return;
}
Map valueOfTarget = null;
AbstractSession session = mergeManager.getSession();
//collect the changes into a vector
HashMap addObjects = ((DirectMapChangeRecord)changeRecord).getAddObjects();
HashMap removeObjects = ((DirectMapChangeRecord)changeRecord).getRemoveObjects();
//Check to see if the target has an instantiated collection
if ((isAttributeValueInstantiated(target)) && (!changeRecord.getOwner().isNew())) {
valueOfTarget = (Map)getRealCollectionAttributeValueFromObject(target, session);
} else {
//if not create an instance of the map
valueOfTarget = (Map)containerPolicy.containerInstance(addObjects.size());
}
if (!isAttributeValueInstantiated(target)) {
if (mergeManager.shouldMergeChangesIntoDistributedCache()) {
return;
}
Object valueOfSource = getRealCollectionAttributeValueFromObject(source, session);
for (Object iterator = containerPolicy.iteratorFor(valueOfSource);
containerPolicy.hasNext(iterator);) {
Map.Entry entry = (Map.Entry)containerPolicy.nextEntry(iterator, session);
containerPolicy.addInto(entry.getKey(), entry.getValue(), valueOfTarget, session);
}
} else {
Object synchronizationTarget = valueOfTarget;
// For indirect containers the delegate must be synchronized on,
// not the wrapper as the clone synchs on the delegate, see bug#5685287.
if (valueOfTarget instanceof IndirectCollection) {
synchronizationTarget = ((IndirectCollection)valueOfTarget).getDelegateObject();
}
synchronized (synchronizationTarget) {
// Next iterate over the changes and add them to the container
for (Iterator i = removeObjects.keySet().iterator(); i.hasNext();) {
Object keyToRemove = i.next();
containerPolicy.removeFrom(keyToRemove, null, valueOfTarget, session);
}
for (Iterator i = addObjects.keySet().iterator(); i.hasNext();) {
Object keyToAdd = i.next();
Object nextItem = addObjects.get(keyToAdd);
if (mergeManager.shouldMergeChangesIntoDistributedCache()) {
//bug#4458089 and 4454532- check if collection contains new item before adding during merge into distributed cache
if (!containerPolicy.contains(nextItem, valueOfTarget, session)) {
containerPolicy.addInto(keyToAdd, nextItem, valueOfTarget, session);
}
} else {
containerPolicy.addInto(keyToAdd, nextItem, valueOfTarget, session);
}
}
}
}
setRealAttributeValueInObject(target, valueOfTarget);
}
/**
* INTERNAL:
* Merge changes from the source to the target object.
*/
@Override
public void mergeIntoObject(Object target, boolean isTargetUnInitialized, Object source, MergeManager mergeManager, AbstractSession targetSession) {
if (this.descriptor.getCachePolicy().isProtectedIsolation()&& !this.isCacheable && !targetSession.isProtectedSession()){
setAttributeValueInObject(target, this.indirectionPolicy.buildIndirectObject(new ValueHolder(null)));
return;
}
if (isTargetUnInitialized) {
// This will happen if the target object was removed from the cache before the commit was attempted
if (mergeManager.shouldMergeWorkingCopyIntoOriginal() && (!isAttributeValueInstantiated(source))) {
setAttributeValueInObject(target, getIndirectionPolicy().getOriginalIndirectionObject(getAttributeValueFromObject(source), targetSession));
return;
}
}
if (!shouldMergeCascadeReference(mergeManager)) {
// This is only going to happen on mergeClone, and we should not attempt to merge the reference
return;
}
if (mergeManager.shouldRefreshRemoteObject() && usesIndirection()) {
mergeRemoteValueHolder(target, source, mergeManager);
return;
}
if (mergeManager.isForRefresh()) {
if (!isAttributeValueInstantiated(target)) {
// This will occur when the clone's value has not been instantiated yet and we do not need
// the refresh that attribute
return;
}
} else if (!isAttributeValueInstantiated(source)) {
// I am merging from a clone into an original. No need to do merge if the attribute was never
// modified
return;
}
Map valueOfSource = (Map)getRealCollectionAttributeValueFromObject(source, mergeManager.getSession());
// trigger instantiation of target attribute
Object valueOfTarget = getRealCollectionAttributeValueFromObject(target, mergeManager.getSession());
Object newContainer = containerPolicy.containerInstance(containerPolicy.sizeFor(valueOfSource));
boolean fireChangeEvents = false;
if ((this.getDescriptor().getObjectChangePolicy().isObjectChangeTrackingPolicy()) && (target instanceof ChangeTracker) && (((ChangeTracker)target)._persistence_getPropertyChangeListener() != null)) {
fireChangeEvents = true;
//Collections may not be indirect list or may have been replaced with user collection.
Object iterator = containerPolicy.iteratorFor(valueOfTarget);
while (containerPolicy.hasNext(iterator)) {
Map.Entry entry = (Map.Entry)containerPolicy.nextEntry(iterator, mergeManager.getSession());
((ObjectChangeListener)((ChangeTracker)target)._persistence_getPropertyChangeListener()).internalPropertyChange(new MapChangeEvent(target, getAttributeName(), valueOfTarget, entry.getKey(), entry.getValue(), CollectionChangeEvent.REMOVE, false));// make the remove change event fire.
}
if (newContainer instanceof ChangeTracker) {
((ChangeTracker)newContainer)._persistence_setPropertyChangeListener(((ChangeTracker)target)._persistence_getPropertyChangeListener());
}
if (valueOfTarget instanceof ChangeTracker) {
((ChangeTracker)valueOfTarget)._persistence_setPropertyChangeListener(null);//remove listener
}
}
valueOfTarget = newContainer;
for (Object sourceValuesIterator = containerPolicy.iteratorFor(valueOfSource);
containerPolicy.hasNext(sourceValuesIterator);) {
Map.Entry entry = (Map.Entry)containerPolicy.nextEntry(sourceValuesIterator, mergeManager.getSession());
if (fireChangeEvents) {
//Collections may not be indirect list or may have been replaced with user collection.
((ObjectChangeListener)((ChangeTracker)target)._persistence_getPropertyChangeListener()).internalPropertyChange(new MapChangeEvent(target, getAttributeName(), valueOfTarget, entry.getKey(), entry.getValue(), CollectionChangeEvent.ADD, false));// make the add change event fire.
}
containerPolicy.addInto(entry.getKey(), entry.getValue(), valueOfTarget, mergeManager.getSession());
}
if (fireChangeEvents && (getDescriptor().getObjectChangePolicy().isAttributeChangeTrackingPolicy())) {
// check that there were changes, if not then remove the record.
ObjectChangeSet changeSet = ((AttributeChangeListener)((ChangeTracker)target)._persistence_getPropertyChangeListener()).getObjectChangeSet();
if (changeSet != null) {
DirectMapChangeRecord changeRecord = (DirectMapChangeRecord)changeSet.getChangesForAttributeNamed(getAttributeName());
if (changeRecord != null) {
if (!changeRecord.isDeferred()) {
if (!changeRecord.hasChanges()) {
changeSet.removeChange(getAttributeName());
}
} else {
// Must reset the latest collection.
changeRecord.setLatestCollection(valueOfTarget);
}
}
}
}
// Must re-set variable to allow for set method to re-morph changes if the collection is not being stored directly.
setRealAttributeValueInObject(target, valueOfTarget);
}
/**
* INTERNAL:
* Perform the commit event.
* This is used in the uow to delay data modifications.
* This is mostly dealt with in the superclass. Private Owned deletes require extra functionality
*/
@Override
public void performDataModificationEvent(Object[] event, AbstractSession session) throws DatabaseException, DescriptorException {
super.performDataModificationEvent(event, session);
if (event[0] == Delete && containerPolicy.shouldIncludeKeyInDeleteEvent()) {
session.deleteObject(event[3]);
}
}
/**
* INTERNAL:
* Overridden by mappings that require additional processing of the change record after the record has been calculated.
*/
@Override
public void postCalculateChanges(org.eclipse.persistence.sessions.changesets.ChangeRecord changeRecord, UnitOfWorkImpl uow) {
// no need for private owned check. This code is only registered for private owned mappings.
// targets are added to and/or removed to/from the source.
DirectMapChangeRecord mapChangeRecord = (DirectMapChangeRecord)changeRecord;
Iterator it = mapChangeRecord.getRemoveObjects().entrySet().iterator();
while(it.hasNext()) {
Map.Entry entry = (Map.Entry)it.next();
containerPolicy.postCalculateChanges(entry.getKey(), entry.getValue(), referenceDescriptor, this, uow);
}
}
/**
* INTERNAL:
* Insert the private owned object.
*/
@Override
public void postInsert(WriteObjectQuery query) throws DatabaseException {
Object objects;
AbstractRecord databaseRow = new DatabaseRecord();
if (isReadOnly()) {
return;
}
objects = getRealCollectionAttributeValueFromObject(query.getObject(), query.getSession());
if (this.containerPolicy.isEmpty(objects)) {
return;
}
prepareTranslationRow(query.getTranslationRow(), query.getObject(), query.getDescriptor(), query.getSession());
// Extract primary key and value from the source.
for (int index = 0; index < getReferenceKeyFields().size(); index++) {
DatabaseField referenceKey = getReferenceKeyFields().get(index);
DatabaseField sourceKey = getSourceKeyFields().get(index);
Object sourceKeyValue = query.getTranslationRow().get(sourceKey);
databaseRow.put(referenceKey, sourceKeyValue);
}
// Extract target field and its value. Construct insert statement and execute it
Object keyIter = this.containerPolicy.iteratorFor(objects);
while (this.containerPolicy.hasNext(keyIter)) {
Map.Entry entry = (Map.Entry)this.containerPolicy.nextEntry(keyIter, query.getSession());
Object value = getFieldValue(entry.getValue(), query.getSession());
databaseRow.put(getDirectField(), value);
ContainerPolicy.copyMapDataToRow(getContainerPolicy().getKeyMappingDataForWriteQuery(entry, query.getSession()), databaseRow);
// In the uow data queries are cached until the end of the commit.
if (query.shouldCascadeOnlyDependentParts()) {
// Hey I might actually want to use an inner class here... ok array for now.
Object[] event = new Object[3];
event[0] = Insert;
event[1] = getInsertQuery();
event[2] = databaseRow.clone();
query.getSession().getCommitManager().addDataModificationEvent(this, event);
} else {
query.getSession().executeQuery(getInsertQuery(), databaseRow);
}
getContainerPolicy().propogatePostInsert(query, entry);
}
}
/**
* INTERNAL:
* Update private owned part.
*/
@Override
protected void postUpdateWithChangeSet(WriteObjectQuery writeQuery) throws DatabaseException {
ObjectChangeSet changeSet = writeQuery.getObjectChangeSet();
DirectMapChangeRecord changeRecord = (DirectMapChangeRecord)changeSet.getChangesForAttributeNamed(this.getAttributeName());
if (changeRecord == null) {
return;
}
for (int index = 0; index < getReferenceKeyFields().size(); index++) {
DatabaseField referenceKey = getReferenceKeyFields().get(index);
DatabaseField sourceKey = getSourceKeyFields().get(index);
Object sourceKeyValue = writeQuery.getTranslationRow().get(sourceKey);
writeQuery.getTranslationRow().put(referenceKey, sourceKeyValue);
}
for (Iterator iterator = changeRecord.getRemoveObjects().entrySet().iterator();
iterator.hasNext();) {
Object entry = iterator.next();
AbstractRecord thisRow = writeQuery.getTranslationRow().clone();
ContainerPolicy.copyMapDataToRow(containerPolicy.getKeyMappingDataForWriteQuery(entry, writeQuery.getSession()), thisRow);
// Hey I might actually want to use an inner class here... ok array for now.
Object[] event = null;
if (containerPolicy.shouldIncludeKeyInDeleteEvent()){
event = new Object[4];
event[3] = containerPolicy.keyFromEntry(entry);
} else {
event = new Object[3];
}
event[0] = Delete;
event[1] = getDeleteQuery();
event[2] = thisRow;
writeQuery.getSession().getCommitManager().addDataModificationEvent(this, event);
}
for (Iterator iterator = changeRecord.getAddObjects().entrySet().iterator();
iterator.hasNext();) {
Map.Entry entry = (Map.Entry)iterator.next();
AbstractRecord thisRow = writeQuery.getTranslationRow().clone();
Object value = changeRecord.getAddObjects().get(entry.getKey());
value = getFieldValue(value, writeQuery.getSession());
ContainerPolicy.copyMapDataToRow(this.containerPolicy.getKeyMappingDataForWriteQuery(entry, writeQuery.getSession()), thisRow);
thisRow.add(getDirectField(), value);
// Hey I might actually want to use an inner class here... ok array for now.
Object[] event = new Object[3];
event[0] = Insert;
event[1] = getInsertQuery();
event[2] = thisRow;
writeQuery.getSession().getCommitManager().addDataModificationEvent(this, event);
}
}
/**
* INTERNAL:
* Propagate the preDelete event through the container policy if necessary
*/
@Override
public void preDelete(DeleteObjectQuery query) throws DatabaseException {
if (getContainerPolicy().propagatesEventsToCollection()){
Object queryObject = query.getObject();
Object values = getAttributeValueFromObject(queryObject);
Object iterator = containerPolicy.iteratorFor(values);
while (containerPolicy.hasNext(iterator)){
Object wrappedObject = containerPolicy.nextEntry(iterator, query.getSession());
containerPolicy.propogatePreDelete(query, wrappedObject);
}
}
super.preDelete(query);
}
/**
* INTERNAL:
* Rebuild select query.
*/
@Override
protected void initOrRebuildSelectQuery() {
this.selectionQuery = containerPolicy.buildSelectionQueryForDirectCollectionMapping();
}
/**
* INTERNAL:
* Overridden by mappings that require additional processing of the change record after the record has been calculated.
*/
@Override
public void recordPrivateOwnedRemovals(Object object, UnitOfWorkImpl uow) {
// no need for private owned check. This code is only registered for private owned mappings.
// targets are added to and/or removed to/from the source.
Iterator it = (Iterator) containerPolicy.iteratorFor(getRealAttributeValueFromObject(object, uow));
while (it.hasNext()) {
Object clone = it.next();
containerPolicy.recordPrivateOwnedRemovals(clone, referenceDescriptor, uow);
}
}
/**
* INTERNAL:
* Remove a value and its change set from the collection change record. This is used by
* attribute change tracking.
*/
protected void removeFromCollectionChangeRecord(Object newKey, Object newValue, ObjectChangeSet objectChangeSet, UnitOfWorkImpl uow) throws DescriptorException {
DirectMapChangeRecord collectionChangeRecord = (DirectMapChangeRecord)objectChangeSet.getChangesForAttributeNamed(this.getAttributeName());
if (collectionChangeRecord == null) {
collectionChangeRecord = new DirectMapChangeRecord(objectChangeSet);
collectionChangeRecord.setAttribute(getAttributeName());
collectionChangeRecord.setMapping(this);
objectChangeSet.addChange(collectionChangeRecord);
}
collectionChangeRecord.addRemoveChange(newKey, newValue);
}
/**
* INTERNAL:
*/
public void setDirectKeyField(DatabaseField keyField) {
getMappedKeyMapContainerPolicy().setKeyField(keyField, descriptor);
}
/**
* ADVANCED:
* Set the class type of the field value.
* This can be used if field value differs from the object value,
* has specific typing requirements such as usage of java.sql.Blob or NChar.
* This must be called after the field name has been set.
*/
public void setDirectKeyFieldClassification(Class fieldType) {
getDirectKeyField().setType(fieldType);
}
/**
* ADVANCED:
* Set the class type name of the field value.
* This can be used if field value differs from the object value,
* has specific typing requirements such as usage of java.sql.Blob or NChar.
* This must be called after the direct key field has been set.
*/
public void setDirectKeyFieldClassificationName(String fieldTypeName) {
getDirectKeyField().setTypeName(fieldTypeName);
}
/**
* PUBLIC:
* Set the direct key field name in the reference table.
* This is the field that the primitive data value of the Map key is stored in.
*/
public void setDirectKeyFieldName(String fieldName) {
setDirectKeyField(new DatabaseField(fieldName));
}
/**
* INTERNAL:
* Either create a new change record or update the change record with the new value.
* This is used by attribute change tracking.
*/
@Override
public void updateChangeRecord(Object clone, Object newValue, Object oldValue, ObjectChangeSet objectChangeSet, UnitOfWorkImpl uow) throws DescriptorException {
DirectMapChangeRecord collectionChangeRecord = (DirectMapChangeRecord)objectChangeSet.getChangesForAttributeNamed(this.getAttributeName());
if (collectionChangeRecord == null) {
collectionChangeRecord = new DirectMapChangeRecord(objectChangeSet);
collectionChangeRecord.setAttribute(getAttributeName());
collectionChangeRecord.setMapping(this);
objectChangeSet.addChange(collectionChangeRecord);
}
if (collectionChangeRecord.getOriginalCollection() == null) {
collectionChangeRecord.recreateOriginalCollection(oldValue, uow);
}
collectionChangeRecord.setLatestCollection(newValue);
collectionChangeRecord.setIsDeferred(true);
objectChangeSet.deferredDetectionRequiredOn(getAttributeName());
}
/**
* INTERNAL:
* Add or removes a new value and its change set to the collection change record based on the event passed in. This is used by
* attribute change tracking.
*/
@Override
public void updateCollectionChangeRecord(CollectionChangeEvent event, ObjectChangeSet changeSet, UnitOfWorkImpl uow) {
if (event != null ) {
//Letting the mapping create and add the ChangeSet to the ChangeRecord rather
// than the policy, since the policy doesn't know how to handle DirectCollectionChangeRecord.
// if ordering is to be supported in the future, check how the method in CollectionMapping is implemented
Object key = null;
if (event.getClass().equals(ClassConstants.MapChangeEvent_Class)){
key = ((MapChangeEvent)event).getKey();
}
if (event.getChangeType() == CollectionChangeEvent.ADD) {
addToCollectionChangeRecord(key, event.getNewValue(), changeSet, uow);
} else if (event.getChangeType() == CollectionChangeEvent.REMOVE) {
removeFromCollectionChangeRecord(key, event.getNewValue(), changeSet, uow);
} else {
throw ValidationException.wrongCollectionChangeEventType(event.getChangeType());
}
}
}
/**
* PUBLIC:
* Configure the mapping to use an instance of the specified container class
* to hold the target objects.
* The default container class is java.util.Hashtable.
*
The container class must implements (directly or indirectly) the Map interface.
*
Note: Do not use both useMapClass(Class concreteClass), useTransparentMap(). The last use of one of the two methods will override the previous one.
*/
@Override
public void useMapClass(Class concreteClass) {
if (!Helper.classImplementsInterface(concreteClass, ClassConstants.Map_Class)) {
throw DescriptorException.illegalContainerClass(concreteClass);
}
containerPolicy.setContainerClass(concreteClass);
}
/**
* PUBLIC:
* Configure the mapping to use an instance of the specified container class
* to hold the target objects.
*
The container class must implement (directly or indirectly) the Map interface.
*
Note: Do not use both useMapClass(Class concreteClass), useTransparentMap(). The last use of one of the two methods will override the previous one.
*/
public void useTransparentMap() {
setIndirectionPolicy(new TransparentIndirectionPolicy());
useMapClass(ClassConstants.IndirectMap_Class);
}
/**
* PUBLIC:
* This is a helper method to set the key converter to a TypeConversionConverter.
* This ensures that the key value from the database is converted to the correct
* Java type. The converter can also be set directly.
* Note that setting the converter to another converter will overwrite this setting.
*/
public void setKeyClass(Class keyClass) {
TypeConversionConverter converter = new TypeConversionConverter(this);
converter.setObjectClass(keyClass);
setKeyConverter(converter);
}
/**
* PUBLIC:
* This is a helper method to get the object class from the key converter
* if it is a TypeConversionConverter.
* This returns null if not using a TypeConversionConverter key converter.
*/
public Class getKeyClass() {
if ((getKeyConverter() == null) || !(getKeyConverter() instanceof TypeConversionConverter)) {
return null;
}
return ((TypeConversionConverter)getKeyConverter()).getObjectClass();
}
/**
* PUBLIC:
* This is a helper method to set the value converter to a TypeConversionConverter.
* This ensures that the value from the database is converted to the correct
* Java type. The converter can also be set directly.
* Note that setting the converter to another converter will overwrite this setting.
*/
public void setValueClass(Class valueClass) {
TypeConversionConverter converter = new TypeConversionConverter(this);
converter.setObjectClass(valueClass);
setValueConverter(converter);
}
/**
* ADVANCED:
* This method is used to have an object add to a collection once the changeSet is applied
* The referenceKey parameter should only be used for direct Maps.
*/
@Override
public void simpleAddToCollectionChangeRecord(Object referenceKey, Object objectToAdd, ObjectChangeSet changeSet, AbstractSession session) {
DirectMapChangeRecord collectionChangeRecord = (DirectMapChangeRecord)changeSet.getChangesForAttributeNamed(getAttributeName());
if (collectionChangeRecord == null) {
collectionChangeRecord = new DirectMapChangeRecord(changeSet);
collectionChangeRecord.setAttribute(getAttributeName());
collectionChangeRecord.setMapping(this);
collectionChangeRecord.getAddObjects().put(referenceKey, objectToAdd);
changeSet.addChange(collectionChangeRecord);
} else {
if (collectionChangeRecord.getRemoveObjects().containsKey(referenceKey)) {
collectionChangeRecord.getRemoveObjects().remove(referenceKey);
} else {
collectionChangeRecord.getAddObjects().put(referenceKey, objectToAdd);
}
}
}
/**
* ADVANCED:
* This method is used to have an object removed from a collection once the changeSet is applied
* The referenceKey parameter should only be used for direct Maps.
*/
@Override
public void simpleRemoveFromCollectionChangeRecord(Object referenceKey, Object objectToRemove, ObjectChangeSet changeSet, AbstractSession session) {
DirectMapChangeRecord collectionChangeRecord = (DirectMapChangeRecord)changeSet.getChangesForAttributeNamed(getAttributeName());
if (collectionChangeRecord == null) {
collectionChangeRecord = new DirectMapChangeRecord(changeSet);
collectionChangeRecord.setAttribute(getAttributeName());
collectionChangeRecord.setMapping(this);
collectionChangeRecord.getRemoveObjects().put(referenceKey, objectToRemove);
changeSet.addChange(collectionChangeRecord);
} else {
if (collectionChangeRecord.getAddObjects().containsKey(referenceKey)) {
collectionChangeRecord.getAddObjects().remove(referenceKey);
} else {
collectionChangeRecord.getRemoveObjects().put(referenceKey, objectToRemove);
}
}
}
/**
* PUBLIC:
* This is a helper method to get the object class from the value converter
* if it is a TypeConversionConverter.
* This returns null if not using a TypeConversionConverter value converter.
*/
public Class getValueClass() {
if (!(getValueConverter() instanceof TypeConversionConverter)) {
return null;
}
return ((TypeConversionConverter)getValueConverter()).getObjectClass();
}
/**
* INTERNAL:
* Prepare and execute the batch query and store the
* results for each source object in a map keyed by the
* mappings source keys of the source objects.
*/
@Override
protected void executeBatchQuery(DatabaseQuery query, CacheKey parentCacheKey, Map referenceDataByKey, AbstractSession session, AbstractRecord translationRow) {
// Execute query and index resulting object sets by key.
List rows = (List)session.executeQuery(query, translationRow);
MappedKeyMapContainerPolicy mapContainerPolicy = getMappedKeyMapContainerPolicy();
for (AbstractRecord referenceRow : rows) {
Object referenceKey = null;
if (query.isObjectBuildingQuery()){
referenceKey = mapContainerPolicy.buildKey(referenceRow, (ObjectBuildingQuery)query, parentCacheKey, session, true);
} else {
referenceKey = mapContainerPolicy.buildKey(referenceRow, null, parentCacheKey, session, true);
}
Object referenceValue = referenceRow.get(this.directField);
Object eachCacheKey = extractKeyFromTargetRow(referenceRow, session);
Object container = referenceDataByKey.get(eachCacheKey);
if ((container == null) || (container == Helper.NULL_VALUE)) {
container = this.containerPolicy.containerInstance();
referenceDataByKey.put(eachCacheKey, container);
}
// Allow for value conversion.
if (this.valueConverter != null) {
referenceValue = this.valueConverter.convertDataValueToObjectValue(referenceValue, query.getSession());
}
this.containerPolicy.addInto(referenceKey, referenceValue, container, query.getSession());
}
}
/**
* INTERNAL:
* Return the value of the field from the row or a value holder on the query to obtain the object.
*/
@Override
protected Object valueFromRowInternalWithJoin(AbstractRecord row, JoinedAttributeManager joinManager, ObjectBuildingQuery sourceQuery, CacheKey parentCacheKey, AbstractSession executionSession, boolean isTargetProtected) throws DatabaseException {
ContainerPolicy policy = getContainerPolicy();
Object value = policy.containerInstance();
ObjectBuilder objectBuilder = getDescriptor().getObjectBuilder();
// Extract the primary key of the source object, to filter only the joined rows for that object.
Object sourceKey = objectBuilder.extractPrimaryKeyFromRow(row, executionSession);
// If the query was using joining, all of the result rows by primary key will have been computed.
List rows = joinManager.getDataResultsByPrimaryKey().get(sourceKey);
// If no 1-m rows were fetch joined, then get the value normally,
// this can occur with pagination where the last row may not be complete.
if (rows == null) {
return valueFromRowInternal(row, joinManager, sourceQuery, executionSession);
}
// A set of direct values must be maintained to avoid duplicates from multiple 1-m joins.
Set directValues = new HashSet();
Converter valueConverter = getValueConverter();
// For each rows, extract the target row and build the target object and add to the collection.
int size = rows.size();
for (int index = 0; index < size; index++) {
AbstractRecord sourceRow = rows.get(index);
AbstractRecord targetRow = sourceRow;
// The field for many objects may be in the row,
// so build the subpartion of the row through the computed values in the query,
// this also helps the field indexing match.
targetRow = trimRowForJoin(targetRow, joinManager, executionSession);
// Partial object queries must select the primary key of the source and related objects.
// If the target joined rows in null (outerjoin) means an empty collection.
Object directKey = this.containerPolicy.buildKeyFromJoinedRow(targetRow, joinManager, sourceQuery, parentCacheKey, executionSession, isTargetProtected);
if (directKey == null) {
// A null direct value means an empty collection returned as nulls from an outerjoin.
return getIndirectionPolicy().valueFromRow(value);
}
// Only build/add the target object once, skip duplicates from multiple 1-m joins.
if (!directValues.contains(directKey)) {
directValues.add(directKey);
Object directValue = targetRow.get(this.directField);
// Allow for value conversion.
if (valueConverter != null) {
directValue = valueConverter.convertDataValueToObjectValue(directValue, executionSession);
}
policy.addInto(directKey, directValue, value, executionSession);
}
}
return getIndirectionPolicy().valueFromRow(value);
}
}