Examples of 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
org.hibernate.collection.spi.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

Examples of org.hibernate.collection.PersistentCollection

          //    with the current Session
          //throw new AssertionFailure("bug loading unowned collection");
        }
      }


      PersistentCollection rowCollection = persistenceContext.getLoadContexts()
          .getCollectionLoadContext( rs )
          .getLoadingCollection( persister, collectionRowKey );


      if ( rowCollection != null ) {
        rowCollection.readFrom( rs, persister, descriptor, owner );
      }


    }
    else if ( optionalKey != null ) {
      // we did not find a collection element in the result set, so we

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Examples of org.hibernate.collection.PersistentCollection

      log.trace( "starting attempt to find loading collection [" + MessageHelper.collectionInfoString( persister.getRole(), key ) + "]" );
    }
    final LoadingCollectionEntry loadingCollectionEntry = loadContexts.locateLoadingCollectionEntry( collectionKey );
    if ( loadingCollectionEntry == null ) {
      // look for existing collection as part of the persistence context
      PersistentCollection collection = loadContexts.getPersistenceContext().getCollection( collectionKey );
      if ( collection != null ) {
        if ( collection.wasInitialized() ) {
          log.trace( "collection already initialized; ignoring" );
          return null; // ignore this row of results! Note the early exit
        }
        else {
          // initialize this collection
          log.trace( "collection not yet initialized; initializing" );
        }
      }
      else {
        Object owner = loadContexts.getPersistenceContext().getCollectionOwner( key, persister );
        final boolean newlySavedEntity = owner != null
            && loadContexts.getPersistenceContext().getEntry( owner ).getStatus() != Status.LOADING
            && em != EntityMode.DOM4J;
        if ( newlySavedEntity ) {
          // important, to account for newly saved entities in query
          // todo : some kind of check for new status...
          log.trace( "owning entity already loaded; ignoring" );
          return null;
        }
        else {
          // create one
          if ( log.isTraceEnabled() ) {
            log.trace( "instantiating new collection [key=" + key + ", rs=" + resultSet + "]" );
          }
          collection = persister.getCollectionType()
              .instantiate( loadContexts.getPersistenceContext().getSession(), persister, key );
        }
      }
      collection.beforeInitialize( persister, -1 );
      collection.beginRead();
      localLoadingCollectionKeys.add( collectionKey );
      loadContexts.registerLoadingCollectionXRef( collectionKey, new LoadingCollectionEntry( resultSet, persister, key, collection ) );
      return collection;
    }
    else {

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Examples of org.hibernate.collection.PersistentCollection

   * called by a collection that wants to initialize itself
   */
  public void onInitializeCollection(InitializeCollectionEvent event)
  throws HibernateException {


    PersistentCollection collection = event.getCollection();
    SessionImplementor source = event.getSession();


    CollectionEntry ce = source.getPersistenceContext().getCollectionEntry(collection);
    if (ce==null) throw new HibernateException("collection was evicted");
    if ( !collection.wasInitialized() ) {
      if ( log.isTraceEnabled() ) {
        log.trace(
            "initializing collection " +
            MessageHelper.collectionInfoString( ce.getLoadedPersister(), ce.getLoadedKey(), source.getFactory() )
          );

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Examples of org.hibernate.collection.PersistentCollection


  public void execute() throws HibernateException {
    final Serializable id = getKey();
    final SessionImplementor session = getSession();
    final CollectionPersister persister = getPersister();
    final PersistentCollection collection = getCollection();
    boolean affectedByFilters = persister.isAffectedByEnabledFilters(session);


    preUpdate();


    if ( !collection.wasInitialized() ) {
      if ( !collection.hasQueuedOperations() ) throw new AssertionFailure( "no queued adds" );
      //do nothing - we only need to notify the cache...
    }
    else if ( !affectedByFilters && collection.empty() ) {
      if ( !emptySnapshot ) persister.remove( id, session );
    }
    else if ( collection.needsRecreate(persister) ) {
      if (affectedByFilters) {
        throw new HibernateException(
          "cannot recreate collection while filter is enabled: " + 
          MessageHelper.collectionInfoString( persister, id, persister.getFactory() )
        );

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Examples of org.hibernate.collection.PersistentCollection

    EventSource session = getSession();
    CollectionPersister persister = session.getFactory().getCollectionPersister( type.getRole() );


    final Serializable collectionKey = extractCollectionKeyFromOwner( persister );
    if ( collection!=null && (collection instanceof PersistentCollection) ) {
      PersistentCollection wrapper = (PersistentCollection) collection;
      if ( wrapper.setCurrentSession(session) ) {
        //a "detached" collection!
        if ( !isOwnerUnchanged( wrapper, persister, collectionKey ) ) {
          // if the collection belonged to a different entity,
          // clean up the existing state of the collection
          removeCollection( persister, collectionKey, session );

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Examples of org.hibernate.collection.PersistentCollection


    if ( collection == null ) {
      //do nothing
    }
    else if ( collection instanceof PersistentCollection ) {
      PersistentCollection persistentCollection = ( PersistentCollection ) collection;
      if ( persistentCollection.setCurrentSession( session ) ) {
        if ( isOwnerUnchanged( persistentCollection, persister, extractCollectionKeyFromOwner( persister ) ) ) {
          // a "detached" collection that originally belonged to the same entity
          if ( persistentCollection.isDirty() ) {
            throw new HibernateException( "reassociated object has dirty collection" );
          }
          reattachCollection( persistentCollection, type );
        }
        else {

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Examples of org.hibernate.collection.PersistentCollection

  }


  public void execute() throws HibernateException {
    // this method is called when a new non-null collection is persisted
    // or when an existing (non-null) collection is moved to a new owner
    final PersistentCollection collection = getCollection();
    
    preRecreate();


    getPersister().recreate( collection, getKey(), getSession() );

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Examples of org.hibernate.collection.PersistentCollection

    Iterator iter = context.getCollectionEntries().entrySet().iterator(); //TODO: calling entrySet on an IdentityMap is SLOW!!
    while ( iter.hasNext() ) {
      Map.Entry me = (Map.Entry) iter.next();


      CollectionEntry ce = (CollectionEntry) me.getValue();
      PersistentCollection collection = (PersistentCollection) me.getKey();
      if ( !collection.wasInitialized() && ce.getLoadedPersister() == collectionPersister ) {


        if ( checkForEnd && i == end ) {
          return keys; //the first key found after the given key
        }

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Examples of org.hibernate.collection.PersistentCollection

      // (if the collection is uninitialized, hibernate has no way of
      // knowing if the collection is actually empty without querying the db)
      getPersister().remove( getKey(), getSession() );
    }
    
    final PersistentCollection collection = getCollection();
    if (collection!=null) {
      getSession().getPersistenceContext()
        .getCollectionEntry(collection)
        .afterAction(collection);
    }

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Examples of org.hibernate.collection.PersistentCollection

    }
    else {
      return; //EARLY EXIT!
    }


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

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