Examples of org.hibernate.ogm.datastore.spi.Association

org.hibernate.ogm.datastore.spi.Association
Represents an Association (think of it as a set of rows, each representing a specific link). A Association accepts a {@link AssociationSnapshot} which is a read-only stateof the association when read from the database or freshly created. An association collects changes applied to it. These changes are represented by a list of {@link org.hibernate.ogm.datastore.spi.AssociationOperation}. It is intended that {@link org.hibernate.ogm.dialect.GridDialect}s retrieve these actions and apply them to the datastore. The list of changes is computed against the snapshot. @author Emmanuel Bernard <emmanuel@hibernate.org>

  @Override
  public Association createAssociation(AssociationKey key) {
    final Cache associationCache = getAssociationCache();
    Map<RowKey, Map<String, Object>> association = new HashMap<RowKey, Map<String, Object>>();
    associationCache.put( new Element( key, association ) );
    return new Association( new MapAssociationSnapshot( association ) );
  }

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  }


  @Override
  public Association getAssociation(AssociationKey key, AssociationContext associationContext) {
    Map<RowKey, Map<String, Object>> associationMap = provider.getAssociation( key );
    return associationMap == null ? null : new Association( new MapAssociationSnapshot( associationMap ) );
  }

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  @Override
  public Association createAssociation(AssociationKey key) {
    Map<RowKey, Map<String, Object>> associationMap = new HashMap<RowKey, Map<String,Object>>();
    provider.putAssociation( key, associationMap );
    return new Association( new MapAssociationSnapshot( associationMap ) );
  }

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      return null;
    }
    else {
      @SuppressWarnings("unchecked")
      Map<SerializableKey, Map<String, Object>> associationRows = (Map<SerializableKey, Map<String, Object>>) element.getObjectValue();
      return new Association( new SerializableMapAssociationSnapshot( associationRows ) );
    }
  }

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  @Override
  public Association createAssociation(AssociationKey key, AssociationContext associationContext) {
    final Cache<SerializableKey> associationCache = datastoreProvider.getAssociationCache();
    Map<SerializableKey, Map<String, Object>> association = new HashMap<SerializableKey, Map<String, Object>>();
    associationCache.put( new Element( new SerializableKey( key ), association ) );
    return new Association( new SerializableMapAssociationSnapshot( association ) );
  }

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        .gridDialect( gridDialect )
        .keyGridType( getKeyGridType() )
        .associationKeyMetadata( associationKeyMetadata )
        .collectionPersister( this );


    final Association collectionMetadata = associationPersister.getAssociationOrNull();
    return collectionMetadata == null ? 0 : collectionMetadata.size();
  }

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          .keyGridType( getKeyGridType() )
          .associationKeyMetadata( associationKeyMetadata )
          .collectionPersister( this )
          .session( session );


      Association association = associationPersister.getAssociationOrNull();


      if ( association != null ) {
        // shortcut to avoid loop if we can
        if ( associationType != AssociationType.OTHER ) {
          for ( RowKey assocEntryKey : association.getKeys() ) {
            // we unfortunately cannot mass change the update of the associated entity
            updateInverseSideOfAssociationNavigation(
                session,
                null,
                association.get( assocEntryKey ),
                Action.REMOVE,
                assocEntryKey
                );
          }
        }
        association.clear();


        if ( associationPersister.hostingEntityRequiresReadAfterUpdate() ) {
          Object owner = session.getPersistenceContext().getCollectionOwner( id, this );
          associationPersister.hostingEntity( owner );
        }

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    if ( association == null ) {
      // Compute bi-directionality first
      AssociationKey key = getAssociationKey();
      if ( isBidirectional == Boolean.FALSE ) {
        //fake association to prevent unidirectional associations to keep record of the inverse side
        association = new Association();
      }
      else {
        association = gridDialect.getAssociation( key, getAssociationContext() );
        if (association == null) {
          association = gridDialect.createAssociation( key, getAssociationContext() );

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        .keyGridType( gridUniqueKeyType )
        //does not set .collectionPersister as it does not make sense here for an entity
        .associationKeyMetadata( associationKeyMetadata )
        .session( session )
        .propertyType( getPropertyTypes()[propertyIndex] );
    final Association ids = associationPersister.getAssociationOrNull();


    if (ids == null || ids.size() == 0 ) {
      return null;
    }
    else if (ids.size() == 1) {
      //EntityLoader#loadByUniqueKey uses a null object and LockMode.NONE
      //there is only one element in the list, so get the first
      Tuple tuple = ids.get( ids.getKeys().iterator().next() );
      final Serializable id = (Serializable) getGridIdentifierType().nullSafeGet( tuple, getIdentifierColumnNames(), session, null );
      return load( id, null, LockMode.NONE, session );
    }
    else {
      throw new AssertionFailure(

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  }


  @Override
  public Association getAssociation(AssociationKey key, AssociationContext associationContext) {
    Map<RowKey, Map<String, Object>> associationMap = provider.getAssociation( key );
    return associationMap == null ? null : new Association( new MapAssociationSnapshot( associationMap ) );
  }

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