Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / Utils / Boolean / ConversionContext.cs / 1305376 / 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
- ImpersonateTokenRef.cs
- MenuItem.cs
- SudsWriter.cs
- ActivationService.cs
- ProviderConnectionPointCollection.cs
- peersecuritysettings.cs
- GridViewDeletedEventArgs.cs
- X509ChainElement.cs
- DSASignatureFormatter.cs
- ToolStripRenderer.cs
- ComponentDispatcher.cs
- ItemList.cs
- RenderContext.cs
- NestPullup.cs
- DataGridViewCell.cs
- WorkflowNamespace.cs
- OdbcConnectionPoolProviderInfo.cs
- Axis.cs
- DiscriminatorMap.cs
- SrgsOneOf.cs
- GridViewCommandEventArgs.cs
- UxThemeWrapper.cs
- TypeResolver.cs
- InvalidWMPVersionException.cs
- HighlightComponent.cs
- ContextStack.cs
- DataGridCell.cs
- XmlSchemaAttributeGroup.cs
- Opcode.cs
- SoapTypeAttribute.cs
- PropertyExpression.cs
- ExtensionFile.cs
- StreamGeometryContext.cs
- ViewEvent.cs
- RuntimeEnvironment.cs
- Button.cs
- MainMenu.cs
- ObjectHandle.cs
- QualifiedCellIdBoolean.cs
- AnnotationHelper.cs
- GridViewCancelEditEventArgs.cs
- Internal.cs
- IsolatedStorageException.cs
- Quaternion.cs
- MLangCodePageEncoding.cs
- ErrorActivity.cs
- XmlSiteMapProvider.cs
- SqlMethodCallConverter.cs
- DataGridHeaderBorder.cs
- XsdDataContractImporter.cs
- listitem.cs
- XmlSchemaSequence.cs
- Lease.cs
- RenderCapability.cs
- ConversionContext.cs
- WizardPanel.cs
- NameObjectCollectionBase.cs
- TraceSection.cs
- FixedSOMTextRun.cs
- ButtonPopupAdapter.cs
- DataGridTextBox.cs
- ViewGenResults.cs
- TextEndOfLine.cs
- MobilePage.cs
- TrackingValidationObjectDictionary.cs
- Misc.cs
- ConvertEvent.cs
- HostSecurityManager.cs
- DrawingVisualDrawingContext.cs
- SyndicationPerson.cs
- Directory.cs
- XPathQilFactory.cs
- SrgsRuleRef.cs
- PathGeometry.cs
- BoolLiteral.cs
- StringComparer.cs
- FormViewInsertEventArgs.cs
- XPathAncestorIterator.cs
- EventSourceCreationData.cs
- DataSourceHelper.cs
- MgmtConfigurationRecord.cs
- ToolStripOverflow.cs
- AppDomain.cs
- SqlInfoMessageEvent.cs
- SHA512Cng.cs
- CheckBoxList.cs
- DataBinding.cs
- JsonReaderDelegator.cs
- SqlDesignerDataSourceView.cs
- TypedRowHandler.cs
- PictureBoxDesigner.cs
- EncodingInfo.cs
- HitTestWithPointDrawingContextWalker.cs
- ResourceCategoryAttribute.cs
- Translator.cs
- ItemContainerGenerator.cs
- WeakReference.cs
- EdmToObjectNamespaceMap.cs
- ResizeGrip.cs
- DatatypeImplementation.cs