Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Query / InternalTrees / ExplicitDiscriminatorMap.cs / 1305376 / ExplicitDiscriminatorMap.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Data.Metadata.Edm; using System.Collections.Generic; using System.Linq; namespace System.Data.Query.InternalTrees { ////// Describes user-defined discriminator metadata (e.g. for a basic TPH mapping). Encapsulates /// relevant data from System.Data.Mapping.ViewGenerabetion.DiscriminatorMap (that is to say, /// data relevant to the PlanCompiler). This separate class accomplishes two things: /// /// 1. Maintain separation of ViewGen and PlanCompiler /// 2. Avoid holding references to CQT expressions in ITree ops (which the ViewGen.DiscriminatorMap /// holds a few CQT references) /// internal class ExplicitDiscriminatorMap { private readonly System.Collections.ObjectModel.ReadOnlyCollection> m_typeMap; private readonly EdmMember m_discriminatorProperty; private readonly System.Collections.ObjectModel.ReadOnlyCollection m_properties; internal ExplicitDiscriminatorMap(System.Data.Mapping.ViewGeneration.DiscriminatorMap template) { m_typeMap = template.TypeMap; m_discriminatorProperty = template.Discriminator.Property; m_properties = template.PropertyMap.Select(propertyValuePair => propertyValuePair.Key) .ToList().AsReadOnly(); } /// /// Maps from discriminator value to type. /// internal System.Collections.ObjectModel.ReadOnlyCollection> TypeMap { get { return m_typeMap; } } /// /// Gets property containing discriminator value. /// internal EdmMember DiscriminatorProperty { get { return m_discriminatorProperty; } } ////// All properties for the type hierarchy. /// internal System.Collections.ObjectModel.ReadOnlyCollectionProperties { get { return m_properties; } } /// /// Returns the type id for the given entity type, or null if non exists. /// internal object GetTypeId(EntityType entityType) { object result = null; foreach (var discriminatorTypePair in this.TypeMap) { if (discriminatorTypePair.Value.EdmEquals(entityType)) { result = discriminatorTypePair.Key; break; } } return result; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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