/// <summary>
/// Run-time implementation for copying the relationship data from object readers to corresponding entities.
/// </summary>
/// <param name="readerEntityPairs">The readers and their corresponding entities.</param>
/// <param name="identityReader">Callback for reading the identities from the readers.</param>
/// <param name="resourceResolver">Service for resolving identity values.</param>
/// <param name="memberName">Name of the member.</param>
/// <param name="relationshipId">ID of relationship being updated.</param>
/// <param name="direction">Direction that the relationship is being updated.</param>
/// <param name="mandatory">Indicates that the member is mandatory.</param>
/// <param name="reporter">Target for any errors.</param>
/// <param name="reportingName">Member name used for reporting.</param>
/// <exception cref="ConnectorRequestException">
/// </exception>
private void RelationshipProcessorImpl(IEnumerable <ReaderEntityPair> readerEntityPairs, Func <IObjectReader, string, IReadOnlyCollection <object> > identityReader, IResourceResolver resourceResolver, string memberName, long relationshipId, Direction direction, bool mandatory, IImportReporter reporter, string reportingName)
{
if (reporter == null)
{
throw new ArgumentNullException(nameof(reporter));
}
// Get identifiers
var identities = new HashSet <object>( );
var entitiesToIdentities = new Dictionary <IEntity, IReadOnlyCollection <object> >( );
foreach (ReaderEntityPair pair in readerEntityPairs)
{
// Resolve targeted entity
IReadOnlyCollection <object> targetResourceIdentities;
IObjectReader reader = pair.ObjectReader;
try
{
targetResourceIdentities = identityReader(reader, memberName);
// Handle missing fields
if (mandatory && (!reader.HasKey(memberName) || targetResourceIdentities.Count == 0))
{
string message = string.Format(Messages.MandatoryPropertyMissing, reportingName);
reporter.ReportError(reader, message);
continue;
}
}
catch (FormatException) // hmm .. this is a bit specific to the JSON reader
{
reporter.ReportError(reader, Messages.IdentifierListContainedNulls);
continue;
}
if (targetResourceIdentities == null)
{
continue;
}
foreach (object identity in targetResourceIdentities)
{
if (identity == null || identity as string == string.Empty)
{
continue;
}
identities.Add(identity);
}
entitiesToIdentities.Add(pair.Entity, targetResourceIdentities);
}
// Resolve resources
IDictionary <object, ResourceResolverEntry> resourceLookup = null;
if (identities.Count > 0)
{
resourceLookup = resourceResolver.ResolveResources(identities.ToList());
}
// Update relationships
foreach (ReaderEntityPair pair in readerEntityPairs)
{
IObjectReader reader = pair.ObjectReader;
IEntity updateEntity = pair.Entity;
IReadOnlyCollection <object> targetIdentities;
if (!entitiesToIdentities.TryGetValue(updateEntity, out targetIdentities))
{
continue;
}
// Update relationship
var col = updateEntity.GetRelationships(relationshipId, direction);
// Clearing is mandatory for lookups;
// mandatory for relationships on new instances with default values;
// and a good idea for other relationships.
// Clearing will reset any default instances, but we've decided this is sensible, otherwise a subsequent update using the
// same data would just clear them anyway. Default values do not get applied for mapped columns.
col.Clear( );
// Find each target identity in the lookup
foreach (object targetIdentity in targetIdentities)
{
if (targetIdentity == null)
{
continue;
}
ResourceResolverEntry entry;
if (resourceLookup == null || !resourceLookup.TryGetValue(targetIdentity, out entry))
{
reporter.ReportError(reader, Messages.ResourceNotFoundByField);
continue;
}
if (entry.Error != ResourceResolverError.None)
{
string message = ResourceResolver.FormatResolverError(entry.Error, targetIdentity.ToString( ));
reporter.ReportError(reader, message);
continue;
}
IEntity targetEntity = entry.Entity;
// And set into the relationship
if (targetEntity != null)
{
col.Add(targetEntity);
}
}
}
}