131 lines
5.2 KiB
C#
131 lines
5.2 KiB
C#
//---------------------------------------------------------------------
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// <copyright file="RelationshipWrapper.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;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Data.Metadata.Edm;
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namespace System.Data.Objects
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{
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internal sealed class RelationshipWrapper : IEquatable<RelationshipWrapper>
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{
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internal readonly AssociationSet AssociationSet;
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internal readonly EntityKey Key0;
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internal readonly EntityKey Key1;
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internal RelationshipWrapper(AssociationSet extent, EntityKey key)
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{
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Debug.Assert(null != extent, "null RelationshipWrapper");
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Debug.Assert(null != (object)key, "null key");
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this.AssociationSet = extent;
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this.Key0 = key;
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this.Key1 = key;
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}
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internal RelationshipWrapper(RelationshipWrapper wrapper, int ordinal, EntityKey key)
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{
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Debug.Assert(null != wrapper, "null RelationshipWrapper");
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Debug.Assert((uint)ordinal <= 1u, "ordinal out of range");
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Debug.Assert(null != (object)key, "null key2");
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this.AssociationSet = wrapper.AssociationSet;
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this.Key0 = (0 == ordinal) ? key : wrapper.Key0;
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this.Key1 = (0 == ordinal) ? wrapper.Key1 : key;
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}
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internal RelationshipWrapper(AssociationSet extent,
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KeyValuePair<string, EntityKey> roleAndKey1,
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KeyValuePair<string, EntityKey> roleAndKey2)
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: this(extent, roleAndKey1.Key, roleAndKey1.Value, roleAndKey2.Key, roleAndKey2.Value)
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{
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}
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internal RelationshipWrapper(AssociationSet extent,
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string role0, EntityKey key0,
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string role1, EntityKey key1)
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{
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Debug.Assert(null != extent, "null AssociationSet");
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Debug.Assert(null != (object)key0, "null key0");
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Debug.Assert(null != (object)key1, "null key1");
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AssociationSet = extent;
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Debug.Assert(extent.ElementType.AssociationEndMembers.Count == 2, "only 2 ends are supported");
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// this assert is explictly commented out to show that the two are similar but different
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// we should always use AssociationEndMembers, never CorrespondingAssociationEndMember
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//Debug.Assert(AssociationSet.AssociationSetEnds.Count == 2, "only 2 set ends supported");
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//Debug.Assert(extent.ElementType.AssociationEndMembers[0] == AssociationSet.AssociationSetEnds[0].CorrespondingAssociationEndMember, "should be same end member");
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//Debug.Assert(extent.ElementType.AssociationEndMembers[1] == AssociationSet.AssociationSetEnds[1].CorrespondingAssociationEndMember, "should be same end member");
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if (extent.ElementType.AssociationEndMembers[0].Name == role0)
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{
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Debug.Assert(extent.ElementType.AssociationEndMembers[1].Name == role1, "a)roleAndKey1 Name differs");
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Key0 = key0;
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Key1 = key1;
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}
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else
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{
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Debug.Assert(extent.ElementType.AssociationEndMembers[0].Name == role1, "b)roleAndKey1 Name differs");
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Debug.Assert(extent.ElementType.AssociationEndMembers[1].Name == role0, "b)roleAndKey0 Name differs");
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Key0 = key1;
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Key1 = key0;
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}
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}
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internal ReadOnlyMetadataCollection<AssociationEndMember> AssociationEndMembers
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{
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get { return this.AssociationSet.ElementType.AssociationEndMembers; }
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}
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internal AssociationEndMember GetAssociationEndMember(EntityKey key)
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{
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Debug.Assert(Key0 == key || Key1 == key, "didn't match a key");
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return AssociationEndMembers[(Key0 != key) ? 1 : 0];
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}
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internal EntityKey GetOtherEntityKey(EntityKey key)
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{
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return ((Key0 == key) ? Key1 : ((Key1 == key) ? Key0 : null));
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}
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internal EntityKey GetEntityKey(int ordinal)
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{
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switch (ordinal)
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{
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case 0:
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return Key0;
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case 1:
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return Key1;
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default:
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throw EntityUtil.ArgumentOutOfRange("ordinal");
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}
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}
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public override int GetHashCode()
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{
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return this.AssociationSet.Name.GetHashCode() ^ (this.Key0.GetHashCode() + this.Key1.GetHashCode());
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}
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public override bool Equals(object obj)
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{
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return Equals(obj as RelationshipWrapper);
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}
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public bool Equals(RelationshipWrapper wrapper)
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{
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return (Object.ReferenceEquals(this, wrapper) ||
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((null != wrapper) &&
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Object.ReferenceEquals(this.AssociationSet, wrapper.AssociationSet) &&
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this.Key0.Equals(wrapper.Key0) &&
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this.Key1.Equals(wrapper.Key1)));
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}
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}
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}
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