/// <summary>
/// Initializes a new instance of the <see cref="EntityDefinition"/> class.
/// </summary>
/// <param name="definitionProvider">
/// The definition provider.
/// </param>
/// <param name="entityReference">
/// The entity reference.
/// </param>
public EntityDefinition([NotNull] IEntityDefinitionProvider definitionProvider, [NotNull] EntityReference entityReference)
{
if (entityReference == null)
{
throw new ArgumentNullException(nameof(entityReference));
}
this.DefinitionProvider = definitionProvider ?? throw new ArgumentNullException(nameof(definitionProvider));
this.allAttributes = new Lazy <List <EntityAttributeDefinition> >(
() => new List <EntityAttributeDefinition>(this.DefinitionProvider.ResolveDefinitions(entityReference.EntityType)));
// Do not include mapped attributes.
this.returnableAttributes =
new Lazy <List <EntityAttributeDefinition> >(this.allAttributes.Value.Where(x => x.IsMetadata == false).ToList);
// Do not include related attributes.
this.directAttributes = new Lazy <List <EntityAttributeDefinition> >(this.returnableAttributes.Value.Where(x => x.IsDirect).ToList);
this.primaryKeyAttributes = new Lazy <List <EntityAttributeDefinition> >(this.directAttributes.Value.Where(x => x.IsPrimaryKey).ToList);
this.rowIdentity = new Lazy <EntityAttributeDefinition?>(this.GetRowIdentity);
// Do not include identity columns.
this.insertableAttributes = new Lazy <List <EntityAttributeDefinition> >(
this.directAttributes.Value.Where(definition => definition.IsIdentityColumn == false && definition.IsComputed == false).ToList);
// Do not include primary keys.
this.updateableAttributes =
new Lazy <List <EntityAttributeDefinition> >(this.insertableAttributes.Value.Except(this.primaryKeyAttributes.Value).ToList);
this.entityLocation = new Lazy <EntityLocation>(() => definitionProvider.GetEntityLocation(entityReference));
var type = entityReference.EntityType;
this.defaultRelations = new Lazy <List <IEntityRelation> >(
() =>
{
if (typeof(IEntityAggregate).IsAssignableFrom(type) && type.GetConstructor(Array.Empty <Type>()) != null)
{
// We have to make an instance to get the relations.
// TODO: Use T4 template in conjunction with property declarations to build this without instantiation
var entity = Activator.CreateInstance(type);
return(((IEntityAggregate)entity).EntityRelations.ToList());
}
return(new List <IEntityRelation>());
});
}
