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

org.hibernate.ogm.model.spi.Association
Represents an association (think of it as a set of rows, each representing a specific link).
An association accepts a {@link AssociationSnapshot} which is a read-only state of the association when read from thedatabase or freshly created.
An association collects changes applied to it. These changes are represented by a list of {@link AssociationOperation}. It is intended that {@link 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>

    else {
      AssociationDocument association = new AssociationDocument( Identifier.createAssociationId( key ) );
      couchDBAssociation = CouchDBAssociation.fromAssociationDocument( association );
    }


    return new Association( new CouchDBAssociationSnapshot( couchDBAssociation, key ) );
  }

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  @Override
  public Association getAssociation(AssociationKey key, AssociationContext associationContext) {
    Cache<AssociationKey, Map<RowKey, Map<String, Object>>> cache = provider.getCache( ASSOCIATION_STORE );
    Map<RowKey, Map<String, Object>> atomicMap = AtomicMapLookup.getFineGrainedAtomicMap( cache, key, false );
    return atomicMap == null ? null : new Association( new MapAssociationSnapshot( atomicMap ) );
  }

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  public Association createAssociation(AssociationKey key, AssociationContext associationContext) {
    //TODO we don't verify that it does not yet exist assuming that this ahs been done before by the calling code
    //should we improve?
    Cache<AssociationKey, Map<RowKey, Map<String, Object>>> cache = provider.getCache( ASSOCIATION_STORE );
    Map<RowKey, Map<String, Object>> atomicMap = AtomicMapLookup.getFineGrainedAtomicMap( cache, key, true );
    return new Association( new MapAssociationSnapshot( atomicMap ) );
  }

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        .keyGridType( gridUniqueKeyType )
        .associationKeyMetadata( associationKeyMetadata )
        .session( session )
        .roleOnMainSide( getPropertyNames()[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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  }


  private void removeNavigationalInformationFromInverseSide(int propertyIndex, AssociationKeyMetadata associationKeyMetadata, Object[] oldColumnValue) {
    AssociationPersister associationPersister = createAssociationPersister( propertyIndex, associationKeyMetadata, oldColumnValue );


    Association association = associationPersister.getAssociation();


    if ( association != null ) {
      RowKey rowKey = getInverseRowKey( associationKeyMetadata, oldColumnValue );
      association.remove( rowKey );
      associationPersister.flushToDatastore();
    }
  }

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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 )
        .roleOnMainSide( mainSidePropertyName );


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

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          .keyGridType( getKeyGridType() )
          .associationKeyMetadata( associationKeyMetadata )
          .roleOnMainSide( getUnqualifiedRole() )
          .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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        .associationKeyMetadata( persister.getAssociationKeyMetadata() )
        // we can be on the main or on the inverse side, so we cannot simply use the unqualified role
        .roleOnMainSide( persister.getMainSidePropertyName() )
        .session( session );


      Association assoc = associationPersister.getAssociationOrNull();
      if ( assoc != null ) {
        for ( RowKey rowKey : assoc.getKeys() ) {
          resultset.addTuple( assoc.get( rowKey ) );
        }
      }
    }
    return resultset;
  }

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