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, AssociationContext associationContext) {
    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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        .tableName( getTableName() )
        .keyGridType( getKeyGridType() )
        .collectionPersister( this )
        .keyColumnNames( getKeyColumnNames() );


    final Association collectionMetadata = metadataProvider.getCollectionMetadataOrNull();
    return collectionMetadata == null ? 0 : collectionMetadata.size();
  }

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  public Association getAssociation(AssociationKey associationKey, AssociationContext associationContext) {
    Node entityNode = findNode( associationKey.getEntityKey() );
    if ( entityNode == null ) {
      return null;
    }
    return new Association( new Neo4jAssociationSnapshot( entityNode, relationshipType( associationKey ), associationKey ) );
  }

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    return new Association( new Neo4jAssociationSnapshot( entityNode, relationshipType( associationKey ), associationKey ) );
  }


  @Override
  public Association createAssociation(AssociationKey associationKey) {
    return new Association( EmptyAssociationSnapshot.SINGLETON );
  }

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        .keyColumnNames( getPropertyColumnNames( propertyIndex ) )
        //does not set .collectionPersister as it does not make sense here for an entity
        .session( session )
        .propertyType( getPropertyTypes()[propertyIndex] )
        .rowKeyColumnNames( buildRowKeyColumnNamesForStarToOne( this, getPropertyColumnNames( propertyIndex ) ) );
    final Association ids = metadataProvider.getCollectionMetadataOrNull();


    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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  @Override
  public Association createAssociation(AssociationKey key, AssociationContext associationContext) {
    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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        .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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    // been created
    executeBatch( associationContext.getOperationsQueue() );
    if ( storageStrategy == AssociationStorageStrategy.IN_ENTITY ) {
      DBObject entity = getEmbeddingEntity( key, associationContext );
      if ( getAssociationFieldOrNull( key, entity ) != null ) {
        return new Association( new MongoDBAssociationSnapshot( entity, key, storageStrategy ) );
      }
      else {
        return null;
      }
    }
    final DBObject result = findAssociation( key, associationContext, storageStrategy );
    if ( result == null ) {
      return null;
    }
    else {
      return new Association( new MongoDBAssociationSnapshot( result, key, storageStrategy ) );
    }
  }

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