Examples of org.hibernate.collection.PersistentCollection

org.hibernate.collection.PersistentCollection
Persistent collections are treated as value objects by Hibernate. ie. they have no independent existence beyond the object holding a reference to them. Unlike instances of entity classes, they are automatically deleted when unreferenced and automatically become persistent when held by a persistent object. Collections can be passed between different objects (change "roles") and this might cause their elements to move from one database table to another.

Hibernate "wraps" a java collection in an instance of PersistentCollection. This mechanism is designed to support tracking of changes to the collection's persistent state and lazy instantiation of collection elements. The downside is that only certain abstract collection types are supported and any extra semantics are lost

Applications should never use classes in this package directly, unless extending the "framework" here.

Changes to structure of the collection are recorded by the collection calling back to the session. Changes to mutable elements (ie. composite elements) are discovered by cloning their state when the collection is initialized and comparing at flush time. @author Gavin King

  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;


    }

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      //TODO: move into collection type, so we can use polymorphism!
      if ( collectionType.hasHolder( session.getEntityMode() ) ) {
        
        if (collection==CollectionType.UNFETCHED_COLLECTION) return null;


        PersistentCollection ah = persistenceContext.getCollectionHolder(collection);
        if (ah==null) {
          ah = collectionType.wrap(session, collection);
          persistenceContext.addNewCollection( persister, ah );
          persistenceContext.addCollectionHolder(ah);
        }
        return null;
      }
      else {


        PersistentCollection persistentCollection = collectionType.wrap(session, collection);
        persistenceContext.addNewCollection( persister, persistentCollection );


        if ( log.isTraceEnabled() ) log.trace( "Wrapped collection in role: " + collectionType.getRole() );


        return persistentCollection; //Force a substitution!

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   * @param key The key of the collection's entry.
   */
  private void addCollection(PersistentCollection coll, CollectionEntry entry, Serializable key) {
    collectionEntries.put( coll, entry );
    CollectionKey collectionKey = new CollectionKey( entry.getLoadedPersister(), key, session.getEntityMode() );
    PersistentCollection old = ( PersistentCollection ) collectionsByKey.put( collectionKey, coll );
    if ( old != null ) {
      if ( old == coll ) {
        throw new AssertionFailure("bug adding collection twice");
      }
      // or should it actually throw an exception?
      old.unsetSession( session );
      collectionEntries.remove( old );
      // watch out for a case where old is still referenced
      // somewhere in the object graph! (which is a user error)
    }
  }

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   * Get the collection entry for a collection passed to filter,
   * which might be a collection wrapper, an array, or an unwrapped
   * collection. Return null if there is no entry.
   */
  public CollectionEntry getCollectionEntryOrNull(Object collection) {
    PersistentCollection coll;
    if ( collection instanceof PersistentCollection ) {
      coll = (PersistentCollection) collection;
      //if (collection==null) throw new TransientObjectException("Collection was not yet persistent");
    }
    else {
      coll = getCollectionHolder(collection);
      if ( coll == null ) {
        //it might be an unwrapped collection reference!
        //try to find a wrapper (slowish)
        Iterator wrappers = IdentityMap.keyIterator(collectionEntries);
        while ( wrappers.hasNext() ) {
          PersistentCollection pc = (PersistentCollection) wrappers.next();
          if ( pc.isWrapper(collection) ) {
            coll = pc;
            break;
          }
        }
      }

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      count = ois.readInt();
      log.trace( "staring deserialization of [" + count + "] collectionEntries entries" );
      rtn.collectionEntries = IdentityMap.instantiateSequenced( count < INIT_COLL_SIZE ? INIT_COLL_SIZE : count );
      for ( int i = 0; i < count; i++ ) {
        final PersistentCollection pc = ( PersistentCollection ) ois.readObject();
        final CollectionEntry ce = CollectionEntry.deserialize( ois, session );
        pc.setCurrentSession( session );
        rtn.collectionEntries.put( pc, ce );
      }


      count = ois.readInt();
      log.trace( "staring deserialization of [" + count + "] arrayHolders entries" );

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    if ( isUpdate ) {
      removeCollection( persister, extractCollectionKeyFromOwner( persister ), session );
    }
    if ( collection != null && ( collection instanceof PersistentCollection ) ) {
      PersistentCollection wrapper = ( PersistentCollection ) collection;
      wrapper.setCurrentSession( session );
      if ( wrapper.wasInitialized() ) {
        session.getPersistenceContext().addNewCollection( persister, wrapper );
      }
      else {
        reattachCollection( wrapper, type );
      }

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    list = IdentityMap.entries( session.getPersistenceContext().getCollectionEntries() );
    size = list.size();
    ActionQueue actionQueue = session.getActionQueue();
    for ( int i = 0; i < size; i++ ) {
      Map.Entry me = (Map.Entry) list.get(i);
      PersistentCollection coll = (PersistentCollection) me.getKey();
      CollectionEntry ce = (CollectionEntry) me.getValue();


      if ( ce.isDorecreate() ) {
        session.getInterceptor().onCollectionRecreate( coll, ce.getCurrentKey() );
        actionQueue.addAction(

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    Iterator iter = persistenceContext.getCollectionEntries().entrySet().iterator();
    while ( iter.hasNext() ) {
      Map.Entry me = (Map.Entry) iter.next();
      CollectionEntry collectionEntry = (CollectionEntry) me.getValue();
      PersistentCollection persistentCollection = (PersistentCollection) me.getKey();
      collectionEntry.postFlush(persistentCollection);
      if ( collectionEntry.getLoadedPersister() == null ) {
        //if the collection is dereferenced, remove from the session cache
        //iter.remove(); //does not work, since the entrySet is not backed by the set
        persistenceContext.getCollectionEntries()

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    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();
  }

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    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();
  }

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