Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / ndp / fx / src / DataEntity / System / Data / Map / Update / Internal / CompositeKey.cs / 1 / CompositeKey.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using KeyComponent = System.Collections.Generic.KeyValuePair; using System.Data.Common.Utils; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Diagnostics; namespace System.Data.Mapping.Update.Internal { /// /// Represents a key composed of multiple parts. /// internal class CompositeKey { #region Fields ////// Gets components of this composite key. /// internal readonly KeyComponent[] KeyComponents; #endregion #region Constructors ////// Initialize a new composite key using the given constant values. Order is important. /// /// Constants composing key internal CompositeKey(PropagatorResult[] constants) { Debug.Assert(null != constants, "key values must be given"); KeyComponents = new KeyComponent[constants.Length]; for (int i = 0; i < constants.Length; i++) { PropagatorResult constant = constants[i]; Debug.Assert(null != constant, "all key values must be set"); Int64 identifier = constant.Identifier; KeyComponents[i] = new KeyComponent(constant, identifier); } } #endregion #region Methods ////// Creates a key comparer operating in the context of the given translator. /// internal static IEqualityComparerCreateComparer(KeyManager keyManager) { return new CompositeKeyComparer(keyManager); } #endregion /// /// Equality and comparison implementation for composite keys. /// private class CompositeKeyComparer : IEqualityComparer{ private readonly KeyManager _manager; internal CompositeKeyComparer(KeyManager manager) { _manager = EntityUtil.CheckArgumentNull(manager, "manager"); } // determines equality by comparing each key component public bool Equals(CompositeKey left, CompositeKey right) { // Short circuit the comparison if we know the other reference is equivalent if (object.ReferenceEquals(left, right)) { return true; } // If either side is null, return false order (both can't be null because of // the previous check) if (null == left || null == right) { return false; } Debug.Assert(null != left.KeyComponents && null != right.KeyComponents, "(Update/JoinPropagator) CompositeKey must be initialized"); if (left.KeyComponents.Length != right.KeyComponents.Length) { return false; } for (int i = 0; i < left.KeyComponents.Length; i++) { object leftValue = GetValue(left.KeyComponents[i]); object rightValue = GetValue(right.KeyComponents[i]); if (!CdpEqualityComparer.DefaultEqualityComparer.Equals(leftValue, rightValue)) { return false; } } return true; } // creates a hash code by XORing hash codes for all key components. public int GetHashCode(CompositeKey key) { EntityUtil.CheckArgumentNull(key, "key"); int result = 0; foreach (KeyComponent keyComponent in key.KeyComponents) { result ^= GetValue(keyComponent).GetHashCode(); } return result; } // Gets the value to use for equality checks given a key component private object GetValue(KeyComponent keyComponent) { if (keyComponent.Value == PropagatorResult.NullIdentifier) { // no identifier exists for this key component, so use the actual key // value Debug.Assert(null != keyComponent.Key && null != keyComponent.Key, "key value must not be null"); return keyComponent.Key.GetSimpleValue(); } else { // use the identifier rather than the actual value (since uniqueness // is not guaranteed for client generated key values in the object layer) return _manager.GetCanonicalIdentifier(keyComponent.Value); } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //---------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using KeyComponent = System.Collections.Generic.KeyValuePair; using System.Data.Common.Utils; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Diagnostics; namespace System.Data.Mapping.Update.Internal { /// /// Represents a key composed of multiple parts. /// internal class CompositeKey { #region Fields ////// Gets components of this composite key. /// internal readonly KeyComponent[] KeyComponents; #endregion #region Constructors ////// Initialize a new composite key using the given constant values. Order is important. /// /// Constants composing key internal CompositeKey(PropagatorResult[] constants) { Debug.Assert(null != constants, "key values must be given"); KeyComponents = new KeyComponent[constants.Length]; for (int i = 0; i < constants.Length; i++) { PropagatorResult constant = constants[i]; Debug.Assert(null != constant, "all key values must be set"); Int64 identifier = constant.Identifier; KeyComponents[i] = new KeyComponent(constant, identifier); } } #endregion #region Methods ////// Creates a key comparer operating in the context of the given translator. /// internal static IEqualityComparerCreateComparer(KeyManager keyManager) { return new CompositeKeyComparer(keyManager); } #endregion /// /// Equality and comparison implementation for composite keys. /// private class CompositeKeyComparer : IEqualityComparer{ private readonly KeyManager _manager; internal CompositeKeyComparer(KeyManager manager) { _manager = EntityUtil.CheckArgumentNull(manager, "manager"); } // determines equality by comparing each key component public bool Equals(CompositeKey left, CompositeKey right) { // Short circuit the comparison if we know the other reference is equivalent if (object.ReferenceEquals(left, right)) { return true; } // If either side is null, return false order (both can't be null because of // the previous check) if (null == left || null == right) { return false; } Debug.Assert(null != left.KeyComponents && null != right.KeyComponents, "(Update/JoinPropagator) CompositeKey must be initialized"); if (left.KeyComponents.Length != right.KeyComponents.Length) { return false; } for (int i = 0; i < left.KeyComponents.Length; i++) { object leftValue = GetValue(left.KeyComponents[i]); object rightValue = GetValue(right.KeyComponents[i]); if (!CdpEqualityComparer.DefaultEqualityComparer.Equals(leftValue, rightValue)) { return false; } } return true; } // creates a hash code by XORing hash codes for all key components. public int GetHashCode(CompositeKey key) { EntityUtil.CheckArgumentNull(key, "key"); int result = 0; foreach (KeyComponent keyComponent in key.KeyComponents) { result ^= GetValue(keyComponent).GetHashCode(); } return result; } // Gets the value to use for equality checks given a key component private object GetValue(KeyComponent keyComponent) { if (keyComponent.Value == PropagatorResult.NullIdentifier) { // no identifier exists for this key component, so use the actual key // value Debug.Assert(null != keyComponent.Key && null != keyComponent.Key, "key value must not be null"); return keyComponent.Key.GetSimpleValue(); } else { // use the identifier rather than the actual value (since uniqueness // is not guaranteed for client generated key values in the object layer) return _manager.GetCanonicalIdentifier(keyComponent.Value); } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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