oracle.toplink.essentials.mappings.DirectMapMapping Maven / Gradle / Ivy
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package oracle.toplink.essentials.mappings;
import java.util.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.expressions.Expression;
import oracle.toplink.essentials.expressions.ExpressionBuilder;
import oracle.toplink.essentials.internal.identitymaps.CacheKey;
import oracle.toplink.essentials.internal.expressions.*;
import oracle.toplink.essentials.internal.helper.*;
import oracle.toplink.essentials.internal.indirection.*;
import oracle.toplink.essentials.internal.queryframework.*;
import oracle.toplink.essentials.internal.sessions.*;
import oracle.toplink.essentials.sessions.DatabaseRecord;
import oracle.toplink.essentials.mappings.converters.*;
import oracle.toplink.essentials.queryframework.*;
import oracle.toplink.essentials.internal.sessions.AbstractRecord;
import oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
/**
* 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 {
/** The direct key field name is converted and stored */
protected DatabaseField directKeyField;
/** Allows user defined conversion between the object attribute value and the database value. */
protected Converter keyConverter;
/**
* DirectMapCollectionMapping constructor
*/
public DirectMapMapping() {
super();
this.selectionQuery = new DataReadQuery();
this.containerPolicy = new DirectMapContainerPolicy(ClassConstants.Hashtable_Class);
}
/**
* 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 keyConverter;
}
/**
* 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) {
this.keyConverter = keyConverter;
}
/**
* 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.
*/
public Object buildCloneForPartObject(Object attributeValue, Object original, Object clone, UnitOfWorkImpl unitOfWork, boolean isExisting) {
DirectMapContainerPolicy containerPolicy = (DirectMapContainerPolicy)getContainerPolicy();
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);) {
Object key = containerPolicy.next(keysIterator, unitOfWork);
Object cloneKey = buildKeyClone(key, unitOfWork, isExisting);
Object cloneValue = buildElementClone(containerPolicy.valueFromKey(key, temporaryCollection), unitOfWork, isExisting);
containerPolicy.addInto(cloneKey, cloneValue, clonedAttributeValue, unitOfWork);
}
return clonedAttributeValue;
}
/**
* INTERNAL:
* Clone the key, if necessary.
* DirectCollections hold on to objects that do not have Descriptors
* (e.g. int, String). These objects do not need to be cloned, unless they use a converter - they
* are immutable.
*/
protected Object buildKeyClone(Object element, UnitOfWorkImpl unitOfWork, boolean isExisting) {
Object cloneValue = element;
if ((getKeyConverter() != null) && getKeyConverter().isMutable()) {
cloneValue = getKeyConverter().convertDataValueToObjectValue(getKeyConverter().convertObjectValueToDataValue(cloneValue, unitOfWork), unitOfWork);
}
return cloneValue;
}
/**
* INTERNAL:
* This method compares the changes between two direct collections. Comparisons are made on equality
* not identity.
* @return prototype.changeset.ChangeRecord
*/
public ChangeRecord compareForChange(Object clone, Object backUp, ObjectChangeSet owner, AbstractSession session) {
Object cloneAttribute = null;
Object backUpAttribute = null;
DirectMapContainerPolicy cp = (DirectMapContainerPolicy)getContainerPolicy();
cloneAttribute = getAttributeValueFromObject(clone);
if ((cloneAttribute != null) && (!getIndirectionPolicy().objectIsInstantiated(cloneAttribute))) {
return null;
}
Map cloneObjectCollection = (Map)getRealCollectionAttributeValueFromObject(clone, session);
HashMap originalKeyValues = new HashMap(10);
HashMap cloneKeyValues = new HashMap(10);
if (!owner.isNew()) {
backUpAttribute = getAttributeValueFromObject(backUp);
if ((backUpAttribute == null) && (cloneAttribute == null)) {
return null;
}
Map backUpCollection = (Map)getRealCollectionAttributeValueFromObject(backUp, session);
Object backUpIter = cp.iteratorFor(backUpCollection);
while (cp.hasNext(backUpIter)) {// Make a lookup of the objects
Object key = cp.next(backUpIter, session);
originalKeyValues.put(key, backUpCollection.get(key));
}
}
Object cloneIter = cp.iteratorFor(cloneObjectCollection);
while (cp.hasNext(cloneIter)) {//Compare them with the objects from the clone
Object firstObject = cp.next(cloneIter, session);
Object firstValue = cloneObjectCollection.get(firstObject);
Object backupValue = originalKeyValues.get(firstObject);
if ( ! originalKeyValues.containsKey(firstObject) ){
cloneKeyValues.put(firstObject, cloneObjectCollection.get(firstObject));
}else if ( (backupValue == null && firstValue != null) || (!backupValue.equals(firstValue)) ) {//the object was not in the backup
cloneKeyValues.put(firstObject, cloneObjectCollection.get(firstObject));
}else{
originalKeyValues.remove(firstObject);
}
}
if (cloneKeyValues.isEmpty() && originalKeyValues.isEmpty() && (!owner.isNew())) {
return null;
}
DirectMapChangeRecord changeRecord = new DirectMapChangeRecord(owner);
changeRecord.setAttribute(getAttributeName());
changeRecord.setMapping(this);
changeRecord.addAdditionChange(cloneKeyValues);
changeRecord.addRemoveChange(originalKeyValues);
return changeRecord;
}
/**
* INTERNAL:
* Compare the attributes belonging to this mapping for the objects.
*/
public boolean compareObjects(Object firstObject, Object secondObject, AbstractSession session) {
Object firstObjectMap = getRealCollectionAttributeValueFromObject(firstObject, session);
Object secondObjectMap = getRealCollectionAttributeValueFromObject(secondObject, session);
DirectMapContainerPolicy mapContainerPolicy = (DirectMapContainerPolicy)getContainerPolicy();
return mapContainerPolicy.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
*/
public void convertClassNamesToClasses(ClassLoader classLoader){
super.convertClassNamesToClasses(classLoader);
if (keyConverter != null) {
if (keyConverter instanceof TypeConversionConverter){
((TypeConversionConverter)keyConverter).convertClassNamesToClasses(classLoader);
} else if (keyConverter instanceof ObjectTypeConverter) {
// To avoid 1.5 dependencies with the EnumTypeConverter check
// against ObjectTypeConverter.
((ObjectTypeConverter) keyConverter).convertClassNamesToClasses(classLoader);
}
}
};
/**
* INTERNAL:
*/
public DatabaseField getDirectKeyField() {
return directKeyField;
}
/**
* INTERNAL:
* Initialize and validate the mapping properties.
*/
public void initialize(AbstractSession session) throws DescriptorException {
super.initialize(session);
initializeDirectKeyField(session);
initializeContainerPolicy(session);
if (getKeyConverter() != null) {
getKeyConverter().initialize(this, session);
}
if (getValueConverter() != null) {
getValueConverter().initialize(this, session);
}
}
/**
* set the key and value fields that are used to build the container from database rows
*/
protected void initializeContainerPolicy(AbstractSession session) {
((DirectMapContainerPolicy)getContainerPolicy()).setKeyField(getDirectKeyField());
((DirectMapContainerPolicy)getContainerPolicy()).setValueField(getDirectField());
((DirectMapContainerPolicy)getContainerPolicy()).setKeyConverter(getKeyConverter());
((DirectMapContainerPolicy)getContainerPolicy()).setValueConverter(getValueConverter());
}
protected void initializeDeleteQuery(AbstractSession session) {
if (!getDeleteQuery().hasSessionName()) {
getDeleteQuery().setSessionName(session.getName());
}
if (hasCustomDeleteQuery()) {
return;
}
Expression builder = new ExpressionBuilder();
Expression directKeyExp = builder.getField(getDirectKeyField()).equal(builder.getParameter(getDirectKeyField()));
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 = (DatabaseField)getReferenceKeyFields().elementAt(index);
DatabaseField sourceKey = (DatabaseField)getSourceKeyFields().elementAt(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);
}
/**
* The field name on the reference table is initialized and cached.
*/
protected void initializeDirectKeyField(AbstractSession session) throws DescriptorException {
if (getDirectKeyField() == null) {
throw DescriptorException.directFieldNameNotSet(this);
}
getDirectKeyField().setTable(getReferenceTable());
getDirectKeyField().setIndex(1);
}
/**
* Initialize insert query. This query is used to insert the collection of objects into the
* reference table.
*/
protected void initializeInsertQuery(AbstractSession session) {
super.initializeInsertQuery(session);
getInsertQuery().getModifyRow().put(getDirectKeyField(), null);
}
protected void initializeSelectionStatement(AbstractSession session) {
SQLSelectStatement statement = new SQLSelectStatement();
statement.addTable(getReferenceTable());
statement.addField((DatabaseField)getDirectField().clone());
statement.addField((DatabaseField)getDirectKeyField().clone());
statement.setWhereClause(getSelectionCriteria());
statement.normalize(session, null);
getSelectionQuery().setSQLStatement(statement);
}
/**
* INTERNAL:
* Related mapping should implement this method to return true.
*/
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
*/
public void mergeChangesIntoObject(Object target, ChangeRecord changeRecord, Object source, MergeManager mergeManager) {
DirectMapContainerPolicy containerPolicy = (DirectMapContainerPolicy)getContainerPolicy();
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);) {
Object key = containerPolicy.next(iterator, session);
containerPolicy.addInto(key, ((Map)valueOfSource).get(key), valueOfTarget, session);
}
} else {
synchronized (valueOfTarget) {
// 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, (Object)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.
*/
public void mergeIntoObject(Object target, boolean isTargetUnInitialized, Object source, MergeManager mergeManager) {
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), mergeManager.getSession()));
return;
}
}
if (!shouldMergeCascadeReference(mergeManager)) {
// This is only going to happen on mergeClone, and we should not attempt to merge the reference
return;
}
if (mergeManager.shouldMergeOriginalIntoWorkingCopy()) {
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());
DirectMapContainerPolicy containerPolicy = (DirectMapContainerPolicy)getContainerPolicy();
// trigger instantiation of target attribute
Object valueOfTarget = getRealCollectionAttributeValueFromObject(target, mergeManager.getSession());
Object newContainer = containerPolicy.containerInstance(containerPolicy.sizeFor(valueOfSource));
boolean fireChangeEvents = false;
valueOfTarget = newContainer;
for (Object sourceValuesIterator = containerPolicy.iteratorFor(valueOfSource);
containerPolicy.hasNext(sourceValuesIterator);) {
Object sourceKey = containerPolicy.next(sourceValuesIterator, mergeManager.getSession());
containerPolicy.addInto(sourceKey, valueOfSource.get(sourceKey), valueOfTarget, mergeManager.getSession());
}
// 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:
* Insert the private owned object.
*/
public void postInsert(WriteObjectQuery query) throws DatabaseException {
Object objects;
AbstractRecord databaseRow = new DatabaseRecord();
if (isReadOnly()) {
return;
}
objects = getRealCollectionAttributeValueFromObject(query.getObject(), query.getSession());
DirectMapContainerPolicy containerPolicy = (DirectMapContainerPolicy)getContainerPolicy();
if (containerPolicy.isEmpty(objects)) {
return;
}
prepareTranslationRow(query.getTranslationRow(), query.getObject(), query.getSession());
// Extract primary key and value from the source.
for (int index = 0; index < getReferenceKeyFields().size(); index++) {
DatabaseField referenceKey = (DatabaseField)getReferenceKeyFields().elementAt(index);
DatabaseField sourceKey = (DatabaseField)getSourceKeyFields().elementAt(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 = containerPolicy.iteratorFor(objects);
while (containerPolicy.hasNext(keyIter)) {
Object key = containerPolicy.next(keyIter, query.getSession());
Object value = containerPolicy.valueFromKey(key, objects);
if (getKeyConverter() != null) {
key = getKeyConverter().convertObjectValueToDataValue(key, query.getSession());
}
if (getValueConverter() != null) {
value = getValueConverter().convertObjectValueToDataValue(value, query.getSession());
}
databaseRow.put(getDirectKeyField(), key);
databaseRow.put(getDirectField(), value);
// 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);
}
}
}
/**
* INTERNAL:
* Update private owned part.
*/
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 = (DatabaseField)getReferenceKeyFields().elementAt(index);
DatabaseField sourceKey = (DatabaseField)getSourceKeyFields().elementAt(index);
Object sourceKeyValue = writeQuery.getTranslationRow().get(sourceKey);
writeQuery.getTranslationRow().put(referenceKey, sourceKeyValue);
}
for (Iterator iterator = changeRecord.getRemoveObjects().keySet().iterator(); iterator.hasNext();){
Object key = iterator.next();
AbstractRecord thisRow = (AbstractRecord)writeQuery.getTranslationRow().clone();
if (getKeyConverter() != null){
key = getKeyConverter().convertObjectValueToDataValue(key, writeQuery.getSession());
}
thisRow.add(getDirectKeyField(), key);
// Hey I might actually want to use an inner class here... ok array for now.
Object[] event = new Object[3];
event[0] = Delete;
event[1] = getDeleteQuery();
event[2] = thisRow;
writeQuery.getSession().getCommitManager().addDataModificationEvent(this, event);
}
for (Iterator iterator = changeRecord.getAddObjects().keySet().iterator(); iterator.hasNext();){
Object key = iterator.next();
AbstractRecord thisRow = (AbstractRecord)writeQuery.getTranslationRow().clone();
Object value = changeRecord.getAddObjects().get(key);
if (getKeyConverter() != null){
key = getKeyConverter().convertObjectValueToDataValue(key, writeQuery.getSession());
}
if (getValueConverter() != null){
value = getValueConverter().convertObjectValueToDataValue(value, writeQuery.getSession());
}
thisRow.add(getDirectKeyField(), key);
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:
* Remove a value and its change set from the collection change record. This is used by
* attribute change tracking.
*/
public 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) {
directKeyField = keyField;
}
/**
* 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.
*/
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.setOriginalCollection(oldValue);
}
collectionChangeRecord.setLatestCollection(newValue);
objectChangeSet.deferredDetectionRequiredOn(getAttributeName());
}
/**
* 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 overide the previous one.
*/
public void useMapClass(Class concreteClass) {
if (!Helper.classImplementsInterface(concreteClass, ClassConstants.Map_Class)) {
throw DescriptorException.illegalContainerClass(concreteClass);
}
DirectMapContainerPolicy policy = new DirectMapContainerPolicy(concreteClass);
setContainerPolicy(policy);
}
/**
* PUBLIC:
* Configure the mapping to use an instance of the specified container class
* to hold the target objects.
*
jdk1.2.x: The container class must implement (directly or indirectly) the Map interface.
*
jdk1.1.x: The container class must be a subclass of Hashtable.
*
Note: Do not use both useMapClass(Class concreteClass), useTransparentMap(). The last use of one of the two methods will overide 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() 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.
*/
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.
*/
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:
* Ovewrite super method
*/
public Object extractResultFromBatchQuery(DatabaseQuery query, AbstractRecord databaseRow, AbstractSession session, AbstractRecord argumentRow) {
//this can be null, because either one exists in the query or it will be created
Hashtable referenceDataByKey = null;
ContainerPolicy mappingContainerPolicy = getContainerPolicy();
synchronized (query) {
referenceDataByKey = (Hashtable)query.getProperty("batched objects");
mappingContainerPolicy = getContainerPolicy();
if (referenceDataByKey == null) {
Vector rows = (Vector)session.executeQuery(query, argumentRow);
referenceDataByKey = new Hashtable();
for (Enumeration rowsEnum = rows.elements(); rowsEnum.hasMoreElements();) {
AbstractRecord referenceRow = (AbstractRecord)rowsEnum.nextElement();
Object referenceKey = referenceRow.get(getDirectKeyField());
Object referenceValue = referenceRow.get(getDirectField());
CacheKey eachCacheKey = new CacheKey(extractKeyFromReferenceRow(referenceRow, session));
Object container = referenceDataByKey.get(eachCacheKey);
if (container == null) {
container = mappingContainerPolicy.containerInstance();
referenceDataByKey.put(eachCacheKey, container);
}
// Allow for key conversion.
if (getKeyConverter() != null) {
referenceKey = getKeyConverter().convertDataValueToObjectValue(referenceKey, query.getSession());
}
// Allow for value conversion.
if (getValueConverter() != null) {
referenceValue = getValueConverter().convertDataValueToObjectValue(referenceValue, query.getSession());
}
mappingContainerPolicy.addInto(referenceKey, referenceValue, container, query.getSession());
}
query.setProperty("batched objects", referenceDataByKey);
}
}
Object result = referenceDataByKey.get(new CacheKey(extractPrimaryKeyFromRow(databaseRow, session)));
// The source object might not have any target objects
if (result == null) {
return mappingContainerPolicy.containerInstance();
} else {
return result;
}
}
}