Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / DataEntity / System / Data / Common / Utils / Boolean / ConversionContext.cs / 1 / ConversionContext.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Diagnostics; namespace System.Data.Common.Utils.Boolean { ////// Manages state used to translate BoolExpr to decision diagram vertices and back again. /// Specializations exist for generic and DomainConstraint expressions. /// internal abstract class ConversionContext{ /// /// Gets the solver instance associated with this conversion context. Used to reterieve /// canonical Decision Diagram vertices for this context. /// internal readonly Solver Solver = new Solver(); ////// Given a term in BoolExpr, returns the corresponding decision diagram vertex. /// internal abstract Vertex TranslateTermToVertex(TermExprterm); /// /// Describes a vertex as a series of literal->vertex successors such that the literal /// logically implies the given vertex successor. /// internal abstract IEnumerable> GetSuccessors(Vertex vertex); } /// /// VertexLiteral pair, used for ConversionContext.GetSuccessors /// internal sealed class LiteralVertexPair{ internal readonly Vertex Vertex; internal readonly Literal Literal; internal LiteralVertexPair(Vertex vertex, Literal literal) { this.Vertex = vertex; this.Literal = literal; } } /// /// Generic implementation of a ConversionContext /// internal sealed class GenericConversionContext: ConversionContext { readonly Dictionary , int> _variableMap = new Dictionary , int>(); Dictionary > _inverseVariableMap; internal override Vertex TranslateTermToVertex(TermExpr term) { int variable; if (!_variableMap.TryGetValue(term, out variable)) { variable = Solver.CreateVariable(); _variableMap.Add(term, variable); } return Solver.CreateLeafVertex(variable, Solver.BooleanVariableChildren); } internal override IEnumerable > GetSuccessors(Vertex vertex) { LiteralVertexPair [] successors = new LiteralVertexPair [2]; Debug.Assert(2 == vertex.Children.Length); Vertex then = vertex.Children[0]; Vertex @else = vertex.Children[1]; // get corresponding term expression InitializeInverseVariableMap(); TermExpr term = _inverseVariableMap[vertex.Variable]; // add positive successor (then) Literal literal = new Literal (term, true); successors[0] = new LiteralVertexPair (then, literal); // add negative successor (else) literal = literal.MakeNegated(); successors[1] = new LiteralVertexPair (@else, literal); return successors; } private void InitializeInverseVariableMap() { if (null == _inverseVariableMap) { _inverseVariableMap = _variableMap.ToDictionary(kvp => kvp.Value, kvp => kvp.Key); } } } /// /// Specialization of ConversionContext for DomainConstraint BoolExpr /// internal sealed class DomainConstraintConversionContext: ConversionContext > { /// /// A map from domain variables to decision diagram variables. /// readonly Dictionary, int> _domainVariableToRobddVariableMap = new Dictionary , int>(); Dictionary > _inverseMap; /// /// Translates a domain constraint term to an N-ary DD vertex. /// internal override Vertex TranslateTermToVertex(TermExpr> term) { var range = term.Identifier.Range; var domainVariable = term.Identifier.Variable; var domain = domainVariable.Domain; if (range.All(element => !domain.Contains(element))) { // trivially false return Vertex.Zero; } if (domain.All(element => range.Contains(element))) { // trivially true return Vertex.One; } // determine assignments for this constraints (if the range contains a value in the domain, '1', else '0') Vertex[] children = domain.Select(element => range.Contains(element) ? Vertex.One : Vertex.Zero).ToArray(); // see if we know this variable int robddVariable; if (!_domainVariableToRobddVariableMap.TryGetValue(domainVariable, out robddVariable)) { robddVariable = Solver.CreateVariable(); _domainVariableToRobddVariableMap[domainVariable] = robddVariable; } // create a new vertex with the given assignments return Solver.CreateLeafVertex(robddVariable, children); } internal override IEnumerable >> GetSuccessors(Vertex vertex) { InitializeInverseMap(); var domainVariable = _inverseMap[vertex.Variable]; // since vertex children are ordinally aligned with domain, handle domain as array var domain = domainVariable.Domain.ToArray(); // foreach unique successor vertex, build up range Dictionary > vertexToRange = new Dictionary >(); for (int i = 0; i < vertex.Children.Length; i++) { Vertex successorVertex = vertex.Children[i]; Set range; if (!vertexToRange.TryGetValue(successorVertex, out range)) { range = new Set (domainVariable.Domain.Comparer); vertexToRange.Add(successorVertex, range); } range.Add(domain[i]); } foreach (var vertexRange in vertexToRange) { var successorVertex = vertexRange.Key; var range = vertexRange.Value; // construct a DomainConstraint including the given range var constraint = new DomainConstraint (domainVariable, range.MakeReadOnly()); var literal = new Literal >( new TermExpr >(constraint), true); yield return new LiteralVertexPair >(successorVertex, literal); } } private void InitializeInverseMap() { if (null == _inverseMap) { _inverseMap = _domainVariableToRobddVariableMap.ToDictionary(kvp => kvp.Value, kvp => kvp.Key); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //---------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Diagnostics; namespace System.Data.Common.Utils.Boolean { ////// Manages state used to translate BoolExpr to decision diagram vertices and back again. /// Specializations exist for generic and DomainConstraint expressions. /// internal abstract class ConversionContext{ /// /// Gets the solver instance associated with this conversion context. Used to reterieve /// canonical Decision Diagram vertices for this context. /// internal readonly Solver Solver = new Solver(); ////// Given a term in BoolExpr, returns the corresponding decision diagram vertex. /// internal abstract Vertex TranslateTermToVertex(TermExprterm); /// /// Describes a vertex as a series of literal->vertex successors such that the literal /// logically implies the given vertex successor. /// internal abstract IEnumerable> GetSuccessors(Vertex vertex); } /// /// VertexLiteral pair, used for ConversionContext.GetSuccessors /// internal sealed class LiteralVertexPair{ internal readonly Vertex Vertex; internal readonly Literal Literal; internal LiteralVertexPair(Vertex vertex, Literal literal) { this.Vertex = vertex; this.Literal = literal; } } /// /// Generic implementation of a ConversionContext /// internal sealed class GenericConversionContext: ConversionContext { readonly Dictionary , int> _variableMap = new Dictionary , int>(); Dictionary > _inverseVariableMap; internal override Vertex TranslateTermToVertex(TermExpr term) { int variable; if (!_variableMap.TryGetValue(term, out variable)) { variable = Solver.CreateVariable(); _variableMap.Add(term, variable); } return Solver.CreateLeafVertex(variable, Solver.BooleanVariableChildren); } internal override IEnumerable > GetSuccessors(Vertex vertex) { LiteralVertexPair [] successors = new LiteralVertexPair [2]; Debug.Assert(2 == vertex.Children.Length); Vertex then = vertex.Children[0]; Vertex @else = vertex.Children[1]; // get corresponding term expression InitializeInverseVariableMap(); TermExpr term = _inverseVariableMap[vertex.Variable]; // add positive successor (then) Literal literal = new Literal (term, true); successors[0] = new LiteralVertexPair (then, literal); // add negative successor (else) literal = literal.MakeNegated(); successors[1] = new LiteralVertexPair (@else, literal); return successors; } private void InitializeInverseVariableMap() { if (null == _inverseVariableMap) { _inverseVariableMap = _variableMap.ToDictionary(kvp => kvp.Value, kvp => kvp.Key); } } } /// /// Specialization of ConversionContext for DomainConstraint BoolExpr /// internal sealed class DomainConstraintConversionContext: ConversionContext > { /// /// A map from domain variables to decision diagram variables. /// readonly Dictionary, int> _domainVariableToRobddVariableMap = new Dictionary , int>(); Dictionary > _inverseMap; /// /// Translates a domain constraint term to an N-ary DD vertex. /// internal override Vertex TranslateTermToVertex(TermExpr> term) { var range = term.Identifier.Range; var domainVariable = term.Identifier.Variable; var domain = domainVariable.Domain; if (range.All(element => !domain.Contains(element))) { // trivially false return Vertex.Zero; } if (domain.All(element => range.Contains(element))) { // trivially true return Vertex.One; } // determine assignments for this constraints (if the range contains a value in the domain, '1', else '0') Vertex[] children = domain.Select(element => range.Contains(element) ? Vertex.One : Vertex.Zero).ToArray(); // see if we know this variable int robddVariable; if (!_domainVariableToRobddVariableMap.TryGetValue(domainVariable, out robddVariable)) { robddVariable = Solver.CreateVariable(); _domainVariableToRobddVariableMap[domainVariable] = robddVariable; } // create a new vertex with the given assignments return Solver.CreateLeafVertex(robddVariable, children); } internal override IEnumerable >> GetSuccessors(Vertex vertex) { InitializeInverseMap(); var domainVariable = _inverseMap[vertex.Variable]; // since vertex children are ordinally aligned with domain, handle domain as array var domain = domainVariable.Domain.ToArray(); // foreach unique successor vertex, build up range Dictionary > vertexToRange = new Dictionary >(); for (int i = 0; i < vertex.Children.Length; i++) { Vertex successorVertex = vertex.Children[i]; Set range; if (!vertexToRange.TryGetValue(successorVertex, out range)) { range = new Set (domainVariable.Domain.Comparer); vertexToRange.Add(successorVertex, range); } range.Add(domain[i]); } foreach (var vertexRange in vertexToRange) { var successorVertex = vertexRange.Key; var range = vertexRange.Value; // construct a DomainConstraint including the given range var constraint = new DomainConstraint (domainVariable, range.MakeReadOnly()); var literal = new Literal >( new TermExpr >(constraint), true); yield return new LiteralVertexPair >(successorVertex, literal); } } private void InitializeInverseMap() { if (null == _inverseMap) { _inverseMap = _domainVariableToRobddVariableMap.ToDictionary(kvp => kvp.Value, kvp => kvp.Key); } } } } // 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
- PriorityBinding.cs
- DataGridViewTopRowAccessibleObject.cs
- TextServicesManager.cs
- WebServicesSection.cs
- CachedBitmap.cs
- TextBlockAutomationPeer.cs
- OuterGlowBitmapEffect.cs
- ValueTable.cs
- PolicyUnit.cs
- FontSourceCollection.cs
- FacetChecker.cs
- DataServiceKeyAttribute.cs
- DirectionalLight.cs
- HebrewNumber.cs
- Connector.xaml.cs
- NullRuntimeConfig.cs
- adornercollection.cs
- TextTrailingCharacterEllipsis.cs
- AuthenticationServiceManager.cs
- WindowsListBox.cs
- SizeAnimationUsingKeyFrames.cs
- PointConverter.cs
- HttpDebugHandler.cs
- CodeTryCatchFinallyStatement.cs
- NameScope.cs
- SemaphoreSlim.cs
- AnimationLayer.cs
- VariableDesigner.xaml.cs
- ExcludeFromCodeCoverageAttribute.cs
- InteropBitmapSource.cs
- IndexExpression.cs
- GrammarBuilderDictation.cs
- BinHexDecoder.cs
- XmlWhitespace.cs
- WebGetAttribute.cs
- SecurityKeyUsage.cs
- Trace.cs
- SessionParameter.cs
- BaseResourcesBuildProvider.cs
- BitmapSourceSafeMILHandle.cs
- XmlTextReader.cs
- DataServiceSaveChangesEventArgs.cs
- LocalizeDesigner.cs
- Marshal.cs
- ResourceKey.cs
- Number.cs
- GuidelineSet.cs
- CheckBox.cs
- WebPartZoneBase.cs
- IResourceProvider.cs
- VectorAnimation.cs
- CompositeDuplexBindingElementImporter.cs
- SortDescription.cs
- XmlQueryStaticData.cs
- RequestDescription.cs
- ItemDragEvent.cs
- BaseTemplateParser.cs
- Renderer.cs
- DelegatingConfigHost.cs
- CodeDomSerializerException.cs
- PointAnimation.cs
- XmlValidatingReader.cs
- PolicyException.cs
- IdnMapping.cs
- SqlCommandBuilder.cs
- DecoderFallbackWithFailureFlag.cs
- Size3DValueSerializer.cs
- HttpApplicationStateBase.cs
- RenderTargetBitmap.cs
- OuterGlowBitmapEffect.cs
- UntypedNullExpression.cs
- DispatcherHooks.cs
- ChildTable.cs
- ValidateNames.cs
- CodeEventReferenceExpression.cs
- DateTimePicker.cs
- OutputCacheModule.cs
- CachingHintValidation.cs
- CaseExpr.cs
- XhtmlMobileTextWriter.cs
- DataColumnCollection.cs
- OLEDB_Enum.cs
- ProtectedConfiguration.cs
- TextRange.cs
- AsymmetricCryptoHandle.cs
- BasicAsyncResult.cs
- DbConnectionPool.cs
- SiteOfOriginContainer.cs
- ConnectorRouter.cs
- Matrix3D.cs
- TypeElementCollection.cs
- CornerRadius.cs
- ParagraphVisual.cs
- RequestQueue.cs
- OneOfTypeConst.cs
- DataRecordInfo.cs
- VBIdentifierNameEditor.cs
- ObjectMaterializedEventArgs.cs
- PropertyNames.cs
- HtmlEmptyTagControlBuilder.cs