Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / Update / Internal / UndirectedGraph.cs / 1305376 / UndirectedGraph.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Data.Common.Utils; using System.Collections.Generic; using System.Text; namespace System.Data.Mapping.Update.Internal { // Maintains a graph where the direction of the edges is not important class UndirectedGraph: InternalBase { #region Constructor internal UndirectedGraph(IEqualityComparer comparer) { m_graph = new Graph (comparer); m_comparer = comparer; } #endregion #region Fields private Graph m_graph; // Directed graph where we added both edges private IEqualityComparer m_comparer; #endregion #region Properties internal IEnumerable Vertices { get { return m_graph.Vertices; } } /// /// Returns the edges of the graph /// internal IEnumerable> Edges { get { return m_graph.Edges; } } #endregion #region Methods // effects: Adds a new node to the graph. Does nothing if the vertex already exists. internal void AddVertex(TVertex vertex) { m_graph.AddVertex(vertex); } // requires: first and second must exist. An edge between first and // second must not already exist // effects: Adds a new unidirectional edge to the graph. internal void AddEdge(TVertex first, TVertex second) { m_graph.AddEdge(first, second); m_graph.AddEdge(second, first); } // effects: Given a graph of T, returns a map such that nodes in the // same connected component are in the same list in the KeyToListMap internal KeyToListMap GenerateConnectedComponents() { int count = 0; // Set the "component number" for each node Dictionary componentMap = new Dictionary (m_comparer); foreach (TVertex vertex in Vertices) { componentMap.Add(vertex, new ComponentNum(count)); count++; } // Run the connected components algorithm (Page 441 of the CLR -- Cormen, Rivest, Lieserson) foreach (KeyValuePair edge in Edges) { if (componentMap[edge.Key].componentNum != componentMap[edge.Value].componentNum) { // Set the component numbers of both of the nodes to be the same int oldValue = componentMap[edge.Value].componentNum; int newValue = componentMap[edge.Key].componentNum; componentMap[edge.Value].componentNum = newValue; // Since we are resetting edge.Value's component number, find all components whose value // is oldValue and reset it to the new value foreach (TVertex vertex in componentMap.Keys) { if (componentMap[vertex].componentNum == oldValue) { componentMap[vertex].componentNum = newValue; } } } } // Now just grab the vertices which have the same set numbers KeyToListMap result = new KeyToListMap (EqualityComparer .Default); foreach (TVertex vertex in Vertices) { int componentNum = componentMap[vertex].componentNum; result.Add(componentNum, vertex); } return result; } internal override void ToCompactString(StringBuilder builder) { builder.Append(m_graph.ToString()); } // A class just for ensuring that we do not modify the hash table // while iterating over it. Keeps track of the component number for a // connected component private class ComponentNum { internal ComponentNum(int compNum) { componentNum = compNum; } internal int componentNum; public override string ToString() { return StringUtil.FormatInvariant("{0}", componentNum); } }; #endregion } } // 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
- dtdvalidator.cs
- SimpleTextLine.cs
- TextWriterTraceListener.cs
- XmlQueryOutput.cs
- EntityDataSourceConfigureObjectContextPanel.cs
- EntitySetBase.cs
- StatusBarItemAutomationPeer.cs
- wmiprovider.cs
- RadioButtonPopupAdapter.cs
- LazyLoadBehavior.cs
- Pointer.cs
- SatelliteContractVersionAttribute.cs
- Source.cs
- InputProcessorProfilesLoader.cs
- WSSecureConversationFeb2005.cs
- DataBoundLiteralControl.cs
- WorkflowMarkupSerializationException.cs
- DeviceContext.cs
- PrimitiveType.cs
- XslCompiledTransform.cs
- TraceProvider.cs
- StyleSheetRefUrlEditor.cs
- IndexOutOfRangeException.cs
- LateBoundBitmapDecoder.cs
- AuthorizationRuleCollection.cs
- KeyValueConfigurationElement.cs
- CompositeClientFormatter.cs
- ClientTarget.cs
- MexNamedPipeBindingCollectionElement.cs
- DbgUtil.cs
- MemberProjectedSlot.cs
- SizeConverter.cs
- StateDesigner.Layouts.cs
- FamilyMap.cs
- ProviderConnectionPointCollection.cs
- ProfileBuildProvider.cs
- PropertyGeneratedEventArgs.cs
- X509ThumbprintKeyIdentifierClause.cs
- WsdlInspector.cs
- MetadataCacheItem.cs
- SqlNodeAnnotations.cs
- TreeNodeMouseHoverEvent.cs
- RequestQueryProcessor.cs
- CatalogZoneBase.cs
- ResumeStoryboard.cs
- ModuleConfigurationInfo.cs
- DetailsViewDeleteEventArgs.cs
- Zone.cs
- ProviderSettingsCollection.cs
- TextRunTypographyProperties.cs
- XsltContext.cs
- FeedUtils.cs
- AspNetPartialTrustHelpers.cs
- FocusChangedEventArgs.cs
- GridViewSortEventArgs.cs
- XmlIgnoreAttribute.cs
- ContainerVisual.cs
- DesignerActionVerbList.cs
- AssemblyBuilder.cs
- MessageSecurityException.cs
- ViewGenResults.cs
- TCEAdapterGenerator.cs
- MulticastDelegate.cs
- FontWeight.cs
- SamlAudienceRestrictionCondition.cs
- ClientRolePrincipal.cs
- ChannelRequirements.cs
- CustomAttributeFormatException.cs
- AsymmetricAlgorithm.cs
- LicFileLicenseProvider.cs
- OutputCacheModule.cs
- DirectoryRootQuery.cs
- QilPatternFactory.cs
- HiddenField.cs
- COM2TypeInfoProcessor.cs
- DesignerActionPanel.cs
- PropertyChangedEventArgs.cs
- SimpleType.cs
- QilVisitor.cs
- XamlVector3DCollectionSerializer.cs
- IIS7WorkerRequest.cs
- WindowsGraphicsWrapper.cs
- RectIndependentAnimationStorage.cs
- TransformerTypeCollection.cs
- MachineKey.cs
- TextElement.cs
- MsmqIntegrationChannelFactory.cs
- SessionEndingEventArgs.cs
- ServiceAuthorizationElement.cs
- QueryPageSettingsEventArgs.cs
- _KerberosClient.cs
- MobileDeviceCapabilitiesSectionHandler.cs
- RoutedEventConverter.cs
- WindowsTokenRoleProvider.cs
- RuntimeWrappedException.cs
- CustomErrorsSection.cs
- isolationinterop.cs
- WebControlToolBoxItem.cs
- DataGridItemEventArgs.cs
- BezierSegment.cs