82 lines
2.9 KiB
C#
82 lines
2.9 KiB
C#
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//---------------------------------------------------------------------
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// <copyright file="ExplicitDiscriminatorMap.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//
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// @owner [....]
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// @backupOwner [....]
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//---------------------------------------------------------------------
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using System.Data.Metadata.Edm;
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using System.Collections.Generic;
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using System.Linq;
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namespace System.Data.Query.InternalTrees
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{
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/// <summary>
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/// Describes user-defined discriminator metadata (e.g. for a basic TPH mapping). Encapsulates
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/// relevant data from System.Data.Mapping.ViewGenerabetion.DiscriminatorMap (that is to say,
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/// data relevant to the PlanCompiler). This separate class accomplishes two things:
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///
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/// 1. Maintain separation of ViewGen and PlanCompiler
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/// 2. Avoid holding references to CQT expressions in ITree ops (which the ViewGen.DiscriminatorMap
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/// holds a few CQT references)
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/// </summary>
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internal class ExplicitDiscriminatorMap
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{
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private readonly System.Collections.ObjectModel.ReadOnlyCollection<KeyValuePair<object, EntityType>> m_typeMap;
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private readonly EdmMember m_discriminatorProperty;
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private readonly System.Collections.ObjectModel.ReadOnlyCollection<EdmProperty> m_properties;
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internal ExplicitDiscriminatorMap(System.Data.Mapping.ViewGeneration.DiscriminatorMap template)
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{
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m_typeMap = template.TypeMap;
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m_discriminatorProperty = template.Discriminator.Property;
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m_properties = template.PropertyMap.Select(propertyValuePair => propertyValuePair.Key)
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.ToList().AsReadOnly();
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}
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/// <summary>
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/// Maps from discriminator value to type.
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/// </summary>
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internal System.Collections.ObjectModel.ReadOnlyCollection<KeyValuePair<object, EntityType>> TypeMap
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{
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get { return m_typeMap; }
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}
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/// <summary>
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/// Gets property containing discriminator value.
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/// </summary>
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internal EdmMember DiscriminatorProperty
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{
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get { return m_discriminatorProperty; }
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}
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/// <summary>
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/// All properties for the type hierarchy.
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/// </summary>
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internal System.Collections.ObjectModel.ReadOnlyCollection<EdmProperty> Properties
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{
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get { return m_properties; }
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}
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/// <summary>
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/// Returns the type id for the given entity type, or null if non exists.
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/// </summary>
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internal object GetTypeId(EntityType entityType)
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{
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object result = null;
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foreach (var discriminatorTypePair in this.TypeMap)
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{
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if (discriminatorTypePair.Value.EdmEquals(entityType))
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{
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result = discriminatorTypePair.Key;
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break;
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}
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}
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return result;
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}
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}
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}
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