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org.hibernate.envers.internal.entities.mapper.relation.MapCollectionMapper Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.envers.internal.entities.mapper.relation;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.hibernate.collection.spi.PersistentCollection;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.envers.RevisionType;
import org.hibernate.envers.boot.internal.EnversService;
import org.hibernate.envers.internal.entities.mapper.PersistentCollectionChangeData;
import org.hibernate.envers.internal.entities.mapper.PropertyMapper;
import org.hibernate.envers.internal.entities.mapper.relation.lazy.initializor.Initializor;
import org.hibernate.envers.internal.entities.mapper.relation.lazy.initializor.MapCollectionInitializor;
import org.hibernate.envers.internal.reader.AuditReaderImplementor;
import org.hibernate.persister.collection.CollectionPersister;
/**
* @author Adam Warski (adam at warski dot org)
* @author Chris Cranford
*/
public class MapCollectionMapper extends AbstractCollectionMapper implements PropertyMapper {
protected final MiddleComponentData elementComponentData;
protected final MiddleComponentData indexComponentData;
public MapCollectionMapper(
CommonCollectionMapperData commonCollectionMapperData,
Class collectionClass, Class proxyClass,
MiddleComponentData elementComponentData, MiddleComponentData indexComponentData,
boolean revisionTypeInId) {
super( commonCollectionMapperData, collectionClass, proxyClass, false, revisionTypeInId );
this.elementComponentData = elementComponentData;
this.indexComponentData = indexComponentData;
}
@Override
protected Initializor getInitializor(
EnversService enversService,
AuditReaderImplementor versionsReader,
Object primaryKey,
Number revision,
boolean removed) {
return new MapCollectionInitializor<>(
enversService,
versionsReader,
commonCollectionMapperData.getQueryGenerator(),
primaryKey,
revision,
removed,
collectionClass,
elementComponentData,
indexComponentData
);
}
@Override
protected Collection getNewCollectionContent(PersistentCollection newCollection) {
if ( newCollection == null ) {
return null;
}
else {
return ( (Map) newCollection ).entrySet();
}
}
@Override
protected Collection getOldCollectionContent(Serializable oldCollection) {
if ( oldCollection == null ) {
return null;
}
else {
return ( (Map) oldCollection ).entrySet();
}
}
@Override
protected void mapToMapFromObject(
SessionImplementor session,
Map idData,
Map data,
Object changed) {
elementComponentData.getComponentMapper().mapToMapFromObject(
session,
idData,
data,
( (Map.Entry) changed ).getValue()
);
indexComponentData.getComponentMapper().mapToMapFromObject(
session,
idData,
data,
( (Map.Entry) changed ).getKey()
);
}
@Override
protected Set buildCollectionChangeSet(Object eventCollection, Collection collection) {
final Set changeSet = new HashSet<>();
if ( eventCollection != null ) {
for ( Object entry : collection ) {
if ( entry != null ) {
final Map.Entry element = Map.Entry.class.cast( entry );
if ( element.getValue() == null ) {
continue;
}
changeSet.add( entry );
}
}
}
return changeSet;
}
@Override
protected boolean isSame(CollectionPersister collectionPersister, Object oldObject, Object newObject) {
final Map.Entry oldEntry = Map.Entry.class.cast( oldObject );
final Map.Entry newEntry = Map.Entry.class.cast( newObject );
if ( collectionPersister.getKeyType().isSame( oldEntry.getKey(), newEntry.getKey() ) ) {
if ( collectionPersister.getElementType().isSame( oldEntry.getValue(), newEntry.getValue() ) ) {
return true;
}
}
return false;
}
@Override
public List mapCollectionChanges(
SessionImplementor session,
PersistentCollection newColl,
Serializable oldColl,
Serializable id) {
final List collectionChanges = new ArrayList<>();
final CollectionPersister collectionPersister = resolveCollectionPersister( session, newColl );
// Comparing new and old collection content
final Collection newCollection = getNewCollectionContent( newColl );
final Collection oldCollection = getOldCollectionContent( oldColl );
// take the new collection and remove any that exist in the old collection.
// take the resulting Set<> and generate ADD changes
final Set added = buildCollectionChangeSet( newColl, newCollection );
if ( oldColl != null ) {
for ( Object oldObject : oldCollection ) {
for ( Iterator itor = added.iterator(); itor.hasNext(); ) {
Object newObject = itor.next();
if ( isSame( collectionPersister, oldObject, newObject ) ) {
itor.remove();
break;
}
}
}
}
// take the old collection and remove any that exist in the new collection.
// take the resulting Set<> and generate DEL changes.
final Set deleted = buildCollectionChangeSet( oldColl, oldCollection );
if ( newColl != null ) {
for ( Object newObject : newCollection ) {
for ( Iterator itor = deleted.iterator(); itor.hasNext(); ) {
Object oldObject = itor.next();
if ( isSame( collectionPersister, newObject, oldObject ) ) {
itor.remove();
break;
}
}
}
}
addCollectionChanges( session, collectionChanges, added, RevisionType.ADD, id );
addCollectionChanges( session, collectionChanges, deleted, RevisionType.DEL, id );
return collectionChanges;
}
}
