Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / Utils / Boolean / Sentence.cs / 1305376 / Sentence.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 base class for nodes in normal form expressions, e.g. Conjunctive Normal Form /// sentences. /// ///Type of expression leaf term identifiers. internal abstract class NormalFormNode{ private readonly BoolExpr _expr; /// /// Initialize a new normal form node representing the given expression. Caller must /// ensure the expression is logically equivalent to the node. /// /// Expression logically equivalent to this node. protected NormalFormNode(BoolExprexpr) { _expr = expr.Simplify(); } /// /// Gets an expression that is logically equivalent to this node. /// internal BoolExprExpr { get { return _expr; } } /// /// Utility method for delegation that return the expression corresponding to a given /// normal form node. /// ///Type of node /// Node to examine. ///Equivalent Boolean expression for the given node. protected static BoolExprExprSelector (T_NormalFormNode node) where T_NormalFormNode : NormalFormNode { return node._expr; } } /// /// Abstract base class for normal form sentences (CNF and DNF) /// ///Type of expression leaf term identifiers. ///Type of clauses in the sentence. internal abstract class Sentence: NormalFormNode where T_Clause : Clause , IEquatable { private readonly Set _clauses; /// /// Initialize a sentence given the appropriate sentence clauses. Produces /// an equivalent expression by composing the clause expressions using /// the given tree type. /// /// Sentence clauses /// Tree type for sentence (and generated expression) protected Sentence(Setclauses, ExprType treeType) : base(ConvertClausesToExpr(clauses, treeType)) { _clauses = clauses.AsReadOnly(); } // Produces an expression equivalent to the given clauses by composing the clause // expressions using the given tree type. private static BoolExpr ConvertClausesToExpr(Set clauses, ExprType treeType) { bool isAnd = ExprType.And == treeType; Debug.Assert(isAnd || ExprType.Or == treeType); IEnumerable > clauseExpressions = clauses.Select(new Func >(ExprSelector)); if (isAnd) { return new AndExpr (clauseExpressions); } else { return new OrExpr (clauseExpressions); } } public override string ToString() { StringBuilder builder = new StringBuilder(); builder.Append("Sentence{"); builder.Append(_clauses); return builder.Append("}").ToString(); } } /// /// Represents a sentence in disjunctive normal form, e.g.: /// /// Clause1 + Clause2 . ... /// /// Where each DNF clause is of the form: /// /// Literal1 . Literal2 . ... /// /// Each literal is of the form: /// /// Term /// /// or /// /// !Term /// ///Type of expression leaf term identifiers. internal sealed class DnfSentence: Sentence > { // Initializes a new DNF sentence given its clauses. internal DnfSentence(Set > clauses) : base(clauses, ExprType.Or) { } } /// /// Represents a sentence in conjunctive normal form, e.g.: /// /// Clause1 . Clause2 . ... /// /// Where each DNF clause is of the form: /// /// Literal1 + Literal2 + ... /// /// Each literal is of the form: /// /// Term /// /// or /// /// !Term /// ///Type of expression leaf term identifiers. internal sealed class CnfSentence: Sentence > { // Initializes a new CNF sentence given its clauses. internal CnfSentence(Set > clauses) : base(clauses, ExprType.And) { } } } // 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
- ClientCultureInfo.cs
- TaiwanLunisolarCalendar.cs
- DesignTimeHTMLTextWriter.cs
- VolatileResourceManager.cs
- SmtpDigestAuthenticationModule.cs
- ResXDataNode.cs
- DataSpaceManager.cs
- ArgIterator.cs
- DebugHandleTracker.cs
- ScriptReferenceEventArgs.cs
- XPathExpr.cs
- ListBindingHelper.cs
- RuleSettingsCollection.cs
- WmlValidationSummaryAdapter.cs
- TaskExceptionHolder.cs
- Unit.cs
- ReadOnlyCollectionBuilder.cs
- DesignBinding.cs
- TraceLog.cs
- ClientSession.cs
- TemplateField.cs
- LeafCellTreeNode.cs
- AuthenticationConfig.cs
- LinkedDataMemberFieldEditor.cs
- ScalarOps.cs
- TaskExceptionHolder.cs
- ProtocolsSection.cs
- XmlSchemaSimpleTypeUnion.cs
- FileLogRecordEnumerator.cs
- JapaneseLunisolarCalendar.cs
- Content.cs
- NestedContainer.cs
- DataSourceView.cs
- AsymmetricKeyExchangeFormatter.cs
- XmlElementCollection.cs
- InstancePersistenceCommandException.cs
- ModelTypeConverter.cs
- PreProcessor.cs
- HttpWriter.cs
- UnsafePeerToPeerMethods.cs
- IPEndPoint.cs
- UnwrappedTypesXmlSerializerManager.cs
- PolicyManager.cs
- AspCompat.cs
- DecimalKeyFrameCollection.cs
- CloseSequence.cs
- ValueTable.cs
- DateTimeStorage.cs
- SQLMoney.cs
- StringFormat.cs
- UIElementCollection.cs
- IDispatchConstantAttribute.cs
- AppSettingsReader.cs
- ContentAlignmentEditor.cs
- HtmlInputReset.cs
- RelationshipEndMember.cs
- HashMembershipCondition.cs
- GrammarBuilderBase.cs
- CommonProperties.cs
- AuthenticatedStream.cs
- DeferredReference.cs
- SingleResultAttribute.cs
- ToolConsole.cs
- ColorTransformHelper.cs
- PropertyCondition.cs
- ListSortDescriptionCollection.cs
- VariableQuery.cs
- ConfigurationManagerHelper.cs
- ActiveXHost.cs
- InitiatorSessionSymmetricMessageSecurityProtocol.cs
- BindingContext.cs
- XPathDescendantIterator.cs
- ParseHttpDate.cs
- TlsnegoTokenAuthenticator.cs
- Aggregates.cs
- DataGridPagerStyle.cs
- TextComposition.cs
- ServiceOperationParameter.cs
- ToolStripGripRenderEventArgs.cs
- WebDescriptionAttribute.cs
- ConfigXmlText.cs
- FlowNode.cs
- IisTraceListener.cs
- DbgCompiler.cs
- GridItemPatternIdentifiers.cs
- GroupPartitionExpr.cs
- MinimizableAttributeTypeConverter.cs
- BaseParagraph.cs
- GridProviderWrapper.cs
- PrintDialogException.cs
- _SSPISessionCache.cs
- SqlNotificationEventArgs.cs
- PenLineCapValidation.cs
- DefaultHttpHandler.cs
- TextParaLineResult.cs
- Condition.cs
- XmlParserContext.cs
- SystemFonts.cs
- KeyTime.cs
- DesignerOptionService.cs