Java PersistentCollection类代码示例

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
public void updateRows(PersistentCollection collection, Serializable id, SessionImplementor session) 
throws HibernateException {

	if ( !isInverse && collection.isRowUpdatePossible() ) {

		if ( log.isDebugEnabled() ) {
			log.debug( "Updating rows of collection: " + role + "#" + id );
		}

		//update all the modified entries
		int count = doUpdateRows( id, collection, session );

		if ( log.isDebugEnabled() ) {
			log.debug( "done updating rows: " + count + " updated" );
		}
	}
}
 

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
@Override
public void serialize(PersistentCollection coll, JsonGenerator jgen, SerializerProvider provider)
		throws IOException, JsonProcessingException
{
	// If lazy-loaded, not yet loaded, may serialize as null?
	if (!_forceLazyLoading && !coll.wasInitialized()) {
		jgen.writeNull();
		return;
	}
	Object value = coll.getValue();
	if (value == null) {
		provider.defaultSerializeNull(jgen);
	} else {
		if (_serializer == null) { // sanity check...
			throw new JsonMappingException("PersitentCollection does not have serializer set");
		}
		_serializer.serialize(value, jgen, provider);
	}
}
 

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
/**
 *
 * @param o Set the object
 * @param association Set the association to initialize
 */
protected Object initializeProperty(final Object o, final String association) {
	Object object;
	try {
		object = PropertyUtils.getProperty(o, association);
	} catch (Exception e) {
		logger.debug("Cannot get proxy " + association + " for class " + o.getClass());
		return null;
	}
	if (object == null) {
		return null;
	} else if (object instanceof HibernateProxy) {
		((HibernateProxy) object).getHibernateLazyInitializer().initialize();
		LazyInitializer lazyInitializer = ((HibernateProxy) object)
				.getHibernateLazyInitializer();
		return lazyInitializer.getImplementation();
	} else if (object instanceof PersistentCollection) {
		((PersistentCollection) object).forceInitialization();
		return object;
	} else {
		return object;
	}
}
 

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
/**
 * Delete any entities that were removed from the collection
 */
private void deleteOrphans(String entityName, PersistentCollection pc) throws HibernateException {
	//TODO: suck this logic into the collection!
	final Collection orphans;
	if ( pc.wasInitialized() ) {
		CollectionEntry ce = eventSource.getPersistenceContext().getCollectionEntry(pc);
		orphans = ce==null ?
				CollectionHelper.EMPTY_COLLECTION :
				ce.getOrphans(entityName, pc);
	}
	else {
		orphans = pc.getQueuedOrphans(entityName);
	}

	final Iterator orphanIter = orphans.iterator();
	while ( orphanIter.hasNext() ) {
		Object orphan = orphanIter.next();
		if (orphan!=null) {
			if ( log.isTraceEnabled() ) {
				log.trace("deleting orphaned entity instance: " + entityName);
			}
			eventSource.delete( entityName, orphan, false, null );
		}
	}
}
 

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
/**
 * For collections just loaded from the database
 */
public CollectionEntry(
		final PersistentCollection collection, 
		final CollectionPersister loadedPersister, 
		final Serializable loadedKey, 
		final boolean ignore
) {
	this.ignore=ignore;

	//collection.clearDirty()
	
	this.loadedKey = loadedKey;
	setLoadedPersister(loadedPersister);

	collection.setSnapshot(loadedKey, role, null);

	//postInitialize() will be called after initialization
}
 

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
@Override
public JsonSerializer<?> findSerializer(
		SerializationConfig config, JavaType type,
		BeanDescription beanDesc)
		{
	Class<?> raw = type.getRawClass();

	/* Note: PersistentCollection does not implement Collection, so we
	 * may get some types here...
	 */
	if (PersistentCollection.class.isAssignableFrom(raw)) {
		// TODO: handle iterator types? Or PersistentArrayHolder?
	}

	if (HibernateProxy.class.isAssignableFrom(raw)) {
		return new HibernateProxySerializer(isEnabled(Feature.FORCE_LAZY_LOADING));
	}
	return null;
		}
 

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
/**
 * Force initialization of all non-lazy collections encountered during
 * the current two-phase load (actually, this is a no-op, unless this
 * is the "outermost" load)
 */
public void initializeNonLazyCollections() throws HibernateException {
	if ( loadCounter == 0 ) {
		log.debug( "initializing non-lazy collections" );
		//do this work only at the very highest level of the load
		loadCounter++; //don't let this method be called recursively
		try {
			int size;
			while ( ( size = nonlazyCollections.size() ) > 0 ) {
				//note that each iteration of the loop may add new elements
				( (PersistentCollection) nonlazyCollections.remove( size - 1 ) ).forceInitialization();
			}
		}
		finally {
			loadCounter--;
			clearNullProperties();
		}
	}
}
 

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
/**
 * Attempt to locate the loading collection given the owner's key.  The lookup here
 * occurs against all result-set contexts...
 *
 * @param persister The collection persister
 * @param ownerKey The owner key
 * @return The loading collection, or null if not found.
 */
public PersistentCollection locateLoadingCollection(CollectionPersister persister, Serializable ownerKey) {
	LoadingCollectionEntry lce = locateLoadingCollectionEntry( new CollectionKey( persister, ownerKey, getEntityMode() ) );
	if ( lce != null ) {
		if ( log.isTraceEnabled() ) {
			log.trace( "returning loading collection:" + MessageHelper.collectionInfoString( persister, ownerKey, getSession().getFactory() ) );
		}
		return lce.getCollection();
	}
	else {
		// todo : should really move this log statement to CollectionType, where this is used from...
		if ( log.isTraceEnabled() ) {
			log.trace( "creating collection wrapper:" + MessageHelper.collectionInfoString( persister, ownerKey, getSession().getFactory() ) );
		}
		return null;
	}
}
 

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
Object processCollection(Object collection, CollectionType collectionType)
throws HibernateException {

	if ( collection!=null && (collection instanceof PersistentCollection) ) {

		final SessionImplementor session = getSession();
		PersistentCollection coll = (PersistentCollection) collection;
		if ( coll.setCurrentSession(session) ) {
			reattachCollection( coll, collectionType );
		}
		return null;

	}
	else {
		return processArrayOrNewCollection(collection, collectionType);
	}

}
 

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
public void evictCollection(Object value, CollectionType type) {

		final Object pc;
		if ( type.hasHolder( getSession().getEntityMode() ) ) {
			pc = getSession().getPersistenceContext().removeCollectionHolder(value);
		}
		else if ( value instanceof PersistentCollection ) {
			pc = value;
		}
		else {
			return; //EARLY EXIT!
		}

		PersistentCollection collection = (PersistentCollection) pc;
		if ( collection.unsetSession( getSession() ) ) evictCollection(collection);
	}
 

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
public void execute() throws HibernateException {
	final PersistentCollection collection = getCollection();
	
	getPersister().recreate( collection, getKey(), getSession() );
	
	getSession().getPersistenceContext()
			.getCollectionEntry(collection)
			.afterAction(collection);
	
	evict();

	if ( getSession().getFactory().getStatistics().isStatisticsEnabled() ) {
		getSession().getFactory().getStatisticsImplementor()
				.recreateCollection( getPersister().getRole() );
	}
}
 

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
public void execute() throws HibernateException {
	if ( !emptySnapshot ) getPersister().remove( getKey(), getSession() );
	
	final PersistentCollection collection = getCollection();
	if (collection!=null) {
		getSession().getPersistenceContext()
			.getCollectionEntry(collection)
			.afterAction(collection);
	}
	
	evict();

	if ( getSession().getFactory().getStatistics().isStatisticsEnabled() ) {
		getSession().getFactory().getStatisticsImplementor()
				.removeCollection( getPersister().getRole() );
	}
}
 

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
/**
 * instantiate a collection wrapper (called when loading an object)
 *
 * @param key The collection owner key
 * @param session The session from which the request is originating.
 * @param owner The collection owner
 * @return The collection
 */
public Object getCollection(Serializable key, SessionImplementor session, Object owner) {

	CollectionPersister persister = getPersister( session );
	final PersistenceContext persistenceContext = session.getPersistenceContext();
	final EntityMode entityMode = session.getEntityMode();

	if (entityMode==EntityMode.DOM4J && !isEmbeddedInXML) {
		return UNFETCHED_COLLECTION;
	}

	// check if collection is currently being loaded
	PersistentCollection collection = persistenceContext.getLoadContexts().locateLoadingCollection( persister, key );
	if ( collection == null ) {
		// check if it is already completely loaded, but unowned
		collection = persistenceContext.useUnownedCollection( new CollectionKey(persister, key, entityMode) );
		if ( collection == null ) {
			// create a new collection wrapper, to be initialized later
			collection = instantiate( session, persister, key );
			collection.setOwner( owner );

			persistenceContext.addUninitializedCollection( persister, collection, key );

			// some collections are not lazy:
			if ( initializeImmediately( entityMode ) ) {
				session.initializeCollection( collection, false );
			}
			else if ( !persister.isLazy() ) {
				persistenceContext.addNonLazyCollection( collection );
			}

			if ( hasHolder( entityMode ) ) {
				session.getPersistenceContext().addCollectionHolder( collection );
			}
		}
	}
	collection.setOwner( owner );
	return collection.getValue();
}
 

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
/**
 * Replace the elements of a collection with the elements of another collection.
 *
 * @param original The 'source' of the replacement elements (where we copy from)
 * @param target The target of the replacement elements (where we copy to)
 * @param owner The owner of the collection being merged
 * @param copyCache The map of elements already replaced.
 * @param session The session from which the merge event originated.
 * @return The merged collection.
 */
public Object replaceElements(
		Object original,
		Object target,
		Object owner,
		Map copyCache,
		SessionImplementor session) {
	// TODO: does not work for EntityMode.DOM4J yet!
	java.util.Collection result = ( java.util.Collection ) target;
	result.clear();

	// copy elements into newly empty target collection
	Type elemType = getElementType( session.getFactory() );
	Iterator iter = ( (java.util.Collection) original ).iterator();
	while ( iter.hasNext() ) {
		result.add( elemType.replace( iter.next(), null, session, owner, copyCache ) );
	}

	// if the original is a PersistentCollection, and that original
	// was not flagged as dirty, then reset the target's dirty flag
	// here after the copy operation.
	// </p>
	// One thing to be careful of here is a "bare" original collection
	// in which case we should never ever ever reset the dirty flag
	// on the target because we simply do not know...
	if ( original instanceof PersistentCollection ) {
		if ( result instanceof PersistentCollection ) {
			if ( ! ( ( PersistentCollection ) original ).isDirty() ) {
				( ( PersistentCollection ) result ).clearDirty();
			}
		}
	}

	return result;
}
 

import org.hibernate.collection.PersistentCollection; //导入依赖的package包/类
public PersistentCollection wrap(SessionImplementor session, Object collection) {
	if ( session.getEntityMode()==EntityMode.DOM4J ) {
		return new PersistentMapElementHolder( session, (Element) collection );
	}
	else {
		return new PersistentMap( session, (java.util.Map) collection );
	}
}