public static Optional<Volume> getVolume(EventModel eventModel) {
        if (eventModel.getListResourceContainer().containsResourcesFromSource(ID)) {
            return eventModel
                    .getListResourceContainer()
                    .provideResource(ID)
                    .stream()
                    .map(ResourceModel::getResource)
                    .filter(ob -> ob instanceof Integer)
                    .map(ob -> (Integer) ob)
                    .findAny()
                    .flatMap(Volume::createVolume);

        } else {
            return Optional.empty();
        }
    }
public static Optional<Volume> getVolume(EventModel eventModel) {
        if (eventModel.getListResourceContainer().containsResourcesFromSource(ID)) {
            return eventModel
                    .getListResourceContainer()
                    .provideResource(ID)
                    .stream()
                    .map(ResourceModel::getResource)
                    .filter(ob -> ob instanceof Integer)
                    .map(ob -> (Integer) ob)
                    .findAny()
                    .flatMap(Volume::createVolume);

        } else {
            return Optional.empty();
        }
    }
public static Optional < Volume > getVolume ( EventModel eventModel ) { if ( eventModel . getListResourceContainer ( ) . containsResourcesFromSource ( ID ) ) { return eventModel . getListResourceContainer ( ) . provideResource ( ID ) . stream ( ) . map ( ResourceModel :: getResource ) . filter ( ob -> ob instanceof Integer ) . map ( ob -> ( Integer ) ob ) . findAny ( ) . flatMap ( Volume :: createVolume ) ; } else { return Optional . empty ( ) ; } }
gets the first Volume if found in the EventModel
@param eventModel the EventModel
@return return the optional Volume
gets the first Volume if found in the EventModel