/// <summary>
/// Creates an entity reference for the type specified.
/// </summary>
/// <param name="type">
/// The entity type.
/// </param>
/// <returns>
/// The newly created entity reference.
/// </returns>
internal EntityReference CreateEntityReference(Type type)
{
if (type == null || type == typeof(object))
{
return(null);
}
var inspector = Inspector.InspectorForType(type);
if (inspector == null)
{
return(null);
}
var entityReference = this.CreateEntityReference(inspector);
if (entityReference == null && type.IsInterface)
{
type = TypeFinder.GetCommonBaseType(this.CommonBaseTypeCandidatesForType(type)
.Where(t => t != null && t != typeof(object)).Distinct());
return(this.CreateEntityReference(type));
}
return(entityReference);
}
/// <summary>
/// Gets the common base type candidates for a given type.
/// </summary>
/// <param name="type">
/// The entity type.
/// </param>
/// <returns>
/// The common base type candidates.
/// </returns>
protected virtual IEnumerable <Type> CommonBaseTypeCandidatesForType(Type type)
{
return(new[]
{
TypeFinder.GetCommonBaseType(this.keyBindings.Keys.Where(type.IsAssignableFrom)),
TypeFinder.GetCommonBaseType(this.tableBindings.Keys.Where(type.IsAssignableFrom)),
TypeFinder.GetCommonBaseType(this.columnBindings.Keys.Where(type.IsAssignableFrom))
});
}
/// <summary>
/// Gets the common base type candidates for a given type.
/// </summary>
/// <param name="type">
/// The entity type.
/// </param>
/// <returns>
/// The common base type candidates.
/// </returns>
protected override IEnumerable <Type> CommonBaseTypeCandidatesForType(Type type)
{
var candidates = base.CommonBaseTypeCandidatesForType(type);
if (this.StrictExplicitColumnBinding || this.StrictExplicitTableBinding)
{
return(candidates);
}
var candidate = TypeFinder.GetCommonBaseType(this.entityReferences.Keys.Where(type.IsAssignableFrom));
return(candidates.Concat(new[] { candidate }));
}
/// <summary>
/// Determines whether the database contains any entities of the types specified.
/// </summary>
/// <param name="entityTypes">
/// The entity types.
/// </param>
/// <returns>
/// <c>true</c> if the there are any entities; otherwise <c>false</c>.
/// </returns>
public bool Any(IEnumerable <Type> entityTypes)
{
if (entityTypes == null)
{
throw new ArgumentNullException(nameof(entityTypes));
}
this.ThrowIfDisposed();
var types = entityTypes.ToArray();
var scanSpec = this.entityContext.ScanSpecForType(types);
scanSpec.MaxCells = 1;
var entities = this.Fetch(TypeFinder.GetCommonBaseType(types), scanSpec, Behaviors.DoNotCache);
return(entities != null && entities.OfType <object>().Any());
}
