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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- XmlSerializationWriter.cs
- NativeMethods.cs
- XpsColorContext.cs
- QueueException.cs
- KeyFrames.cs
- SecurityManager.cs
- CharAnimationBase.cs
- TextComposition.cs
- EventTask.cs
- RubberbandSelector.cs
- ObjectParameterCollection.cs
- EventTrigger.cs
- CornerRadius.cs
- newitemfactory.cs
- TableSectionStyle.cs
- XmlSchemaAnnotation.cs
- UserPersonalizationStateInfo.cs
- ResetableIterator.cs
- MenuBase.cs
- TemplateXamlParser.cs
- KeyedHashAlgorithm.cs
- Int32RectConverter.cs
- BookmarkList.cs
- VerificationException.cs
- CompModSwitches.cs
- ServiceObjectContainer.cs
- DeclaredTypeElementCollection.cs
- ReliableOutputConnection.cs
- MembershipUser.cs
- TranslateTransform3D.cs
- SafeFileMapViewHandle.cs
- infer.cs
- MemberPath.cs
- SessionStateItemCollection.cs
- AttachmentService.cs
- CompressionTransform.cs
- TypeValidationEventArgs.cs
- InkPresenter.cs
- InputQueue.cs
- FtpRequestCacheValidator.cs
- TextMetrics.cs
- formatter.cs
- ProfileBuildProvider.cs
- DeclaredTypeValidator.cs
- CommandHelpers.cs
- StrongNameKeyPair.cs
- PeerApplicationLaunchInfo.cs
- PhysicalAddress.cs
- InputQueue.cs
- DayRenderEvent.cs
- StringBuilder.cs
- ControlBuilder.cs
- HandlerFactoryWrapper.cs
- AppDomain.cs
- DataGridParentRows.cs
- PeerNearMe.cs
- DataGridViewCellEventArgs.cs
- XmlAttributeAttribute.cs
- CFStream.cs
- MatchingStyle.cs
- SingleAnimation.cs
- SiteMapNodeItemEventArgs.cs
- FlowDocumentReader.cs
- X509ChainPolicy.cs
- CleanUpVirtualizedItemEventArgs.cs
- TraceLog.cs
- DbConnectionInternal.cs
- XmlArrayItemAttributes.cs
- DBNull.cs
- mediaclock.cs
- EdmRelationshipRoleAttribute.cs
- CodeGen.cs
- NullEntityWrapper.cs
- GridItemPattern.cs
- KeyGesture.cs
- CodeSnippetCompileUnit.cs
- SchemaNotation.cs
- StringOutput.cs
- PolicyStatement.cs
- MimeMapping.cs
- DataGridDetailsPresenterAutomationPeer.cs
- FormViewModeEventArgs.cs
- X509Certificate2Collection.cs
- XmlBinaryReaderSession.cs
- DataGridViewColumnCollection.cs
- TargetPerspective.cs
- StylusButton.cs
- UnsafeNativeMethods.cs
- SHA1Managed.cs
- BinHexDecoder.cs
- UIElement.cs
- ComponentRenameEvent.cs
- ResXDataNode.cs
- ConditionalAttribute.cs
- RtType.cs
- ThemeDictionaryExtension.cs
- AuthenticationModuleElementCollection.cs
- ProxyGenerator.cs
- FrameworkElement.cs
- ItemCollection.cs