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 / Common / Utils / Boolean / Visitor.cs / 1 / Visitor.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Text; using System.Globalization; using System.Collections.ObjectModel; using System.Diagnostics; using System.Linq; namespace System.Data.Common.Utils.Boolean { ////// Abstract visitor class. All Boolean expression nodes know how to /// 'accept' a visitor, and delegate to the appropriate visitor method. /// For instance, AndExpr invokes Visitor.VisitAnd. /// ///Type of leaf term identifiers in expression. ///Return type for visit methods. internal abstract class Visitor{ internal abstract T_Return VisitTrue(TrueExpr expression); internal abstract T_Return VisitFalse(FalseExpr expression); internal abstract T_Return VisitTerm(TermExpr expression); internal abstract T_Return VisitNot(NotExpr expression); internal abstract T_Return VisitAnd(AndExpr expression); internal abstract T_Return VisitOr(OrExpr expression); } /// /// Basic visitor which reproduces the given expression tree. /// ///Type of leaf term identifiers in expression. internal abstract class BasicVisitor: Visitor > { internal override BoolExpr VisitFalse(FalseExpr expression) { return expression; } internal override BoolExpr VisitTrue(TrueExpr expression) { return expression; } internal override BoolExpr VisitTerm(TermExpr expression) { return expression; } internal override BoolExpr VisitNot(NotExpr expression) { return new NotExpr (expression.Child.Accept(this)); } internal override BoolExpr VisitAnd(AndExpr expression) { return new AndExpr (AcceptChildren(expression.Children)); } internal override BoolExpr VisitOr(OrExpr expression) { return new OrExpr (AcceptChildren(expression.Children)); } private IEnumerable > AcceptChildren(IEnumerable > children) { foreach (BoolExpr child in children) { yield return child.Accept(this); } } } internal class TermCounter : Visitor { static readonly TermCounter s_instance = new TermCounter (); internal static int CountTerms(BoolExpr expression) { Debug.Assert(null != expression); return expression.Accept(s_instance); } internal override int VisitTrue(TrueExpr expression) { return 0; } internal override int VisitFalse(FalseExpr expression) { return 0; } internal override int VisitTerm(TermExpr expression) { return 1; } internal override int VisitNot(NotExpr expression) { return expression.Child.Accept(this); } internal override int VisitAnd(AndExpr expression) { return VisitTree(expression); } internal override int VisitOr(OrExpr expression) { return VisitTree(expression); } private int VisitTree(TreeExpr expression) { int sum = 0; foreach (var child in expression.Children) { sum += child.Accept(this); } return sum; } } /// /// A Visitor class that returns all the leaves in a boolean expression /// ///Type of leaf term identifiers in expression. internal class LeafVisitor: Visitor { readonly List > _terms; private LeafVisitor() { _terms = new List >(); } internal static List > GetTerms(BoolExpr expression) { Debug.Assert(null != expression, "expression must be given"); LeafVisitor visitor = new LeafVisitor (); expression.Accept(visitor); return visitor._terms; } internal static IEnumerable GetLeaves(BoolExpr expression) { return GetTerms(expression).Select(term => term.Identifier); } internal override bool VisitTrue(TrueExpr expression) { return true; } internal override bool VisitFalse(FalseExpr expression) { return true; } internal override bool VisitTerm(TermExpr expression) { _terms.Add(expression); return true; } internal override bool VisitNot(NotExpr expression) { return expression.Child.Accept(this); } internal override bool VisitAnd(AndExpr expression) { return VisitTree(expression); } internal override bool VisitOr(OrExpr expression) { return VisitTree(expression); } private bool VisitTree(TreeExpr expression) { foreach (BoolExpr child in expression.Children) { child.Accept(this); } return true; } } /// /// Rewrites the terms in a Boolean expression tree. /// ///Term type for leaf nodes of input ///Term type for leaf nodes of output internal class BooleanExpressionTermRewriter: Visitor > { private readonly Func , BoolExpr > _translator; /// /// Initialize a new translator /// /// Translator delegate; must not be null internal BooleanExpressionTermRewriter(Func, BoolExpr > translator) { Debug.Assert(null != translator); _translator = translator; } internal override BoolExpr VisitFalse(FalseExpr expression) { return FalseExpr .Value; } internal override BoolExpr VisitTrue(TrueExpr expression) { return TrueExpr .Value; } internal override BoolExpr VisitNot(NotExpr expression) { return new NotExpr (expression.Child.Accept(this)); } internal override BoolExpr VisitTerm(TermExpr expression) { return _translator(expression); } internal override BoolExpr VisitAnd(AndExpr expression) { return new AndExpr (VisitChildren(expression)); } internal override BoolExpr VisitOr(OrExpr expression) { return new OrExpr (VisitChildren(expression)); } private IEnumerable > VisitChildren(TreeExpr expression) { foreach (BoolExpr child in expression.Children) { yield return child.Accept(this); } } } /// /// Converts a BoolExpr to a Vertex within a solver. /// internal class ToDecisionDiagramConverter: Visitor { private readonly ConversionContext _context; private ToDecisionDiagramConverter(ConversionContext context) { Debug.Assert(null != context, "must provide a context"); _context = context; } internal static Vertex TranslateToRobdd(BoolExpr expr, ConversionContext context) { Debug.Assert(null != expr, "must provide an expression"); ToDecisionDiagramConverter converter = new ToDecisionDiagramConverter (context); return expr.Accept(converter); } internal override Vertex VisitTrue(TrueExpr expression) { return Vertex.One; } internal override Vertex VisitFalse(FalseExpr expression) { return Vertex.Zero; } internal override Vertex VisitTerm(TermExpr expression) { return _context.TranslateTermToVertex(expression); } internal override Vertex VisitNot(NotExpr expression) { return _context.Solver.Not(expression.Child.Accept(this)); } internal override Vertex VisitAnd(AndExpr expression) { return _context.Solver.And(expression.Children.Select(child => child.Accept(this))); } internal override Vertex VisitOr(OrExpr expression) { return _context.Solver.Or(expression.Children.Select(child => child.Accept(this))); } } } // 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.Text; using System.Globalization; using System.Collections.ObjectModel; using System.Diagnostics; using System.Linq; namespace System.Data.Common.Utils.Boolean { ////// Abstract visitor class. All Boolean expression nodes know how to /// 'accept' a visitor, and delegate to the appropriate visitor method. /// For instance, AndExpr invokes Visitor.VisitAnd. /// ///Type of leaf term identifiers in expression. ///Return type for visit methods. internal abstract class Visitor{ internal abstract T_Return VisitTrue(TrueExpr expression); internal abstract T_Return VisitFalse(FalseExpr expression); internal abstract T_Return VisitTerm(TermExpr expression); internal abstract T_Return VisitNot(NotExpr expression); internal abstract T_Return VisitAnd(AndExpr expression); internal abstract T_Return VisitOr(OrExpr expression); } /// /// Basic visitor which reproduces the given expression tree. /// ///Type of leaf term identifiers in expression. internal abstract class BasicVisitor: Visitor > { internal override BoolExpr VisitFalse(FalseExpr expression) { return expression; } internal override BoolExpr VisitTrue(TrueExpr expression) { return expression; } internal override BoolExpr VisitTerm(TermExpr expression) { return expression; } internal override BoolExpr VisitNot(NotExpr expression) { return new NotExpr (expression.Child.Accept(this)); } internal override BoolExpr VisitAnd(AndExpr expression) { return new AndExpr (AcceptChildren(expression.Children)); } internal override BoolExpr VisitOr(OrExpr expression) { return new OrExpr (AcceptChildren(expression.Children)); } private IEnumerable > AcceptChildren(IEnumerable > children) { foreach (BoolExpr child in children) { yield return child.Accept(this); } } } internal class TermCounter : Visitor { static readonly TermCounter s_instance = new TermCounter (); internal static int CountTerms(BoolExpr expression) { Debug.Assert(null != expression); return expression.Accept(s_instance); } internal override int VisitTrue(TrueExpr expression) { return 0; } internal override int VisitFalse(FalseExpr expression) { return 0; } internal override int VisitTerm(TermExpr expression) { return 1; } internal override int VisitNot(NotExpr expression) { return expression.Child.Accept(this); } internal override int VisitAnd(AndExpr expression) { return VisitTree(expression); } internal override int VisitOr(OrExpr expression) { return VisitTree(expression); } private int VisitTree(TreeExpr expression) { int sum = 0; foreach (var child in expression.Children) { sum += child.Accept(this); } return sum; } } /// /// A Visitor class that returns all the leaves in a boolean expression /// ///Type of leaf term identifiers in expression. internal class LeafVisitor: Visitor { readonly List > _terms; private LeafVisitor() { _terms = new List >(); } internal static List > GetTerms(BoolExpr expression) { Debug.Assert(null != expression, "expression must be given"); LeafVisitor visitor = new LeafVisitor (); expression.Accept(visitor); return visitor._terms; } internal static IEnumerable GetLeaves(BoolExpr expression) { return GetTerms(expression).Select(term => term.Identifier); } internal override bool VisitTrue(TrueExpr expression) { return true; } internal override bool VisitFalse(FalseExpr expression) { return true; } internal override bool VisitTerm(TermExpr expression) { _terms.Add(expression); return true; } internal override bool VisitNot(NotExpr expression) { return expression.Child.Accept(this); } internal override bool VisitAnd(AndExpr expression) { return VisitTree(expression); } internal override bool VisitOr(OrExpr expression) { return VisitTree(expression); } private bool VisitTree(TreeExpr expression) { foreach (BoolExpr child in expression.Children) { child.Accept(this); } return true; } } /// /// Rewrites the terms in a Boolean expression tree. /// ///Term type for leaf nodes of input ///Term type for leaf nodes of output internal class BooleanExpressionTermRewriter: Visitor > { private readonly Func , BoolExpr > _translator; /// /// Initialize a new translator /// /// Translator delegate; must not be null internal BooleanExpressionTermRewriter(Func, BoolExpr > translator) { Debug.Assert(null != translator); _translator = translator; } internal override BoolExpr VisitFalse(FalseExpr expression) { return FalseExpr .Value; } internal override BoolExpr VisitTrue(TrueExpr expression) { return TrueExpr .Value; } internal override BoolExpr VisitNot(NotExpr expression) { return new NotExpr (expression.Child.Accept(this)); } internal override BoolExpr VisitTerm(TermExpr expression) { return _translator(expression); } internal override BoolExpr VisitAnd(AndExpr expression) { return new AndExpr (VisitChildren(expression)); } internal override BoolExpr VisitOr(OrExpr expression) { return new OrExpr (VisitChildren(expression)); } private IEnumerable > VisitChildren(TreeExpr expression) { foreach (BoolExpr child in expression.Children) { yield return child.Accept(this); } } } /// /// Converts a BoolExpr to a Vertex within a solver. /// internal class ToDecisionDiagramConverter: Visitor { private readonly ConversionContext _context; private ToDecisionDiagramConverter(ConversionContext context) { Debug.Assert(null != context, "must provide a context"); _context = context; } internal static Vertex TranslateToRobdd(BoolExpr expr, ConversionContext context) { Debug.Assert(null != expr, "must provide an expression"); ToDecisionDiagramConverter converter = new ToDecisionDiagramConverter (context); return expr.Accept(converter); } internal override Vertex VisitTrue(TrueExpr expression) { return Vertex.One; } internal override Vertex VisitFalse(FalseExpr expression) { return Vertex.Zero; } internal override Vertex VisitTerm(TermExpr expression) { return _context.TranslateTermToVertex(expression); } internal override Vertex VisitNot(NotExpr expression) { return _context.Solver.Not(expression.Child.Accept(this)); } internal override Vertex VisitAnd(AndExpr expression) { return _context.Solver.And(expression.Children.Select(child => child.Accept(this))); } internal override Vertex VisitOr(OrExpr expression) { return _context.Solver.Or(expression.Children.Select(child => child.Accept(this))); } } } // 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
- CodeSnippetExpression.cs
- SelectionPattern.cs
- Point4D.cs
- ColumnWidthChangingEvent.cs
- NetworkAddressChange.cs
- XmlElementElement.cs
- IpcServerChannel.cs
- CalloutQueueItem.cs
- DataGridSortCommandEventArgs.cs
- ProfilePropertySettingsCollection.cs
- JsonSerializer.cs
- XmlWrappingReader.cs
- AppliedDeviceFiltersDialog.cs
- ConfigXmlSignificantWhitespace.cs
- RoleManagerSection.cs
- SelectorAutomationPeer.cs
- CssClassPropertyAttribute.cs
- InternalConfigHost.cs
- PipeSecurity.cs
- KeyMatchBuilder.cs
- DefaultBindingPropertyAttribute.cs
- DiagnosticTrace.cs
- BindingExpression.cs
- GACMembershipCondition.cs
- BaseConfigurationRecord.cs
- webeventbuffer.cs
- ProviderCollection.cs
- CommonObjectSecurity.cs
- TdsParserStateObject.cs
- EventOpcode.cs
- InvokeHandlers.cs
- IsolatedStorageSecurityState.cs
- recordstatefactory.cs
- CursorInteropHelper.cs
- NameNode.cs
- ParallelTimeline.cs
- Binding.cs
- Aggregates.cs
- FieldTemplateFactory.cs
- FileDialog_Vista_Interop.cs
- Parallel.cs
- DispatcherHookEventArgs.cs
- ComplexPropertyEntry.cs
- DataGridColumnHeadersPresenter.cs
- NameScopePropertyAttribute.cs
- ParseChildrenAsPropertiesAttribute.cs
- DrawTreeNodeEventArgs.cs
- CapiNative.cs
- PersonalizationEntry.cs
- ExpressionDumper.cs
- LoadedOrUnloadedOperation.cs
- XmlDataCollection.cs
- ArgumentOutOfRangeException.cs
- DocumentApplication.cs
- EntitySet.cs
- StreamGeometry.cs
- SqlStream.cs
- ToolboxCategory.cs
- CellQuery.cs
- ApplicationCommands.cs
- Compilation.cs
- PersonalizationProvider.cs
- PtsHost.cs
- CorrelationManager.cs
- NullRuntimeConfig.cs
- OdbcConnectionHandle.cs
- OracleException.cs
- HexParser.cs
- CopyEncoder.cs
- StorageComplexPropertyMapping.cs
- ReadOnlyAttribute.cs
- FileDialogCustomPlaces.cs
- SqlCacheDependencyDatabase.cs
- SQLConvert.cs
- SecurityCriticalDataForSet.cs
- TrackingProfileCache.cs
- UpDownBaseDesigner.cs
- SoapClientProtocol.cs
- WsatConfiguration.cs
- JsonReader.cs
- BinaryReader.cs
- PersonalizationStateInfo.cs
- TextTreeInsertElementUndoUnit.cs
- Listbox.cs
- ElementAction.cs
- StorageComplexTypeMapping.cs
- DataGridViewColumnEventArgs.cs
- QuotedPrintableStream.cs
- XmlSchemaValidationException.cs
- StateMachineDesignerPaint.cs
- ConnectivityStatus.cs
- PersonalizationStateInfoCollection.cs
- SqlInternalConnectionSmi.cs
- AQNBuilder.cs
- XPathDocument.cs
- SwitchAttribute.cs
- XmlSchemaProviderAttribute.cs
- FlowDocumentView.cs
- WebHttpBehavior.cs
- TimeZone.cs