Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / DataEntity / System / Data / Common / Utils / Boolean / KnowledgeBase.cs / 3 / KnowledgeBase.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; namespace System.Data.Common.Utils.Boolean { ////// Data structure supporting storage of facts and proof (resolution) of queries given /// those facts. /// /// For instance, we may know the following facts: /// /// A --> B /// A /// /// Given these facts, the knowledge base can prove the query: /// /// B /// /// through resolution. /// ///Type of leaf term identifiers in fact expressions. internal class KnowledgeBase{ private readonly List > _facts; private Vertex _knowledge; private readonly ConversionContext _context; /// /// Initialize a new knowledge base. /// internal KnowledgeBase() { _facts = new List>(); _knowledge = Vertex.One; // we know '1', but nothing else at present _context = IdentifierService .Instance.CreateConversionContext(); } /// /// Adds all facts from another knowledge base /// /// The other knowledge base internal void AddKnowledgeBase(KnowledgeBasekb) { foreach (BoolExpr fact in kb._facts) { AddFact(fact); } } /// /// Adds the given fact to this KB. /// /// Simple fact. internal virtual void AddFact(BoolExprfact) { _facts.Add(fact); Converter converter = new Converter (fact, _context); Vertex factVertex = converter.Vertex; _knowledge = _context.Solver.And(_knowledge, factVertex); } /// /// Adds the given implication to this KB, where implication is of the form: /// /// condition --> implies /// /// Condition /// Entailed expression internal void AddImplication(BoolExprcondition, BoolExpr implies) { AddFact(new Implication(condition, implies)); } /// /// Adds an equivalence to this KB, of the form: /// /// left iff. right /// /// Left operand /// Right operand internal void AddEquivalence(BoolExprleft, BoolExpr right) { AddFact(new Equivalence(left, right)); } public override string ToString() { StringBuilder builder = new StringBuilder(); builder.AppendLine("Facts:"); foreach (BoolExpr fact in _facts) { builder.Append("\t").AppendLine(fact.ToString()); } return builder.ToString(); } // Private class improving debugging output for implication facts // (fact appears as A --> B rather than !A + B) private class Implication : OrExpr { BoolExpr _condition; BoolExpr _implies; // (condition --> implies) iff. (!condition OR implies) internal Implication(BoolExpr condition, BoolExpr implies) : base(condition.MakeNegated(), implies) { _condition = condition; _implies = implies; } public override string ToString() { return StringUtil.FormatInvariant("{0} --> {1}", _condition, _implies); } } // Private class improving debugging output for equivalence facts // (fact appears as A <--> B rather than (!A + B) . (A + !B)) private class Equivalence : AndExpr { BoolExpr _left; BoolExpr _right; // (left iff. right) iff. (left --> right AND right --> left) internal Equivalence(BoolExpr left, BoolExpr right) : base(new Implication(left, right), new Implication(right, left)) { _left = left; _right = right; } public override string ToString() { return StringUtil.FormatInvariant("{0} <--> {1}", _left, _right); } } } } // 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; namespace System.Data.Common.Utils.Boolean { ////// Data structure supporting storage of facts and proof (resolution) of queries given /// those facts. /// /// For instance, we may know the following facts: /// /// A --> B /// A /// /// Given these facts, the knowledge base can prove the query: /// /// B /// /// through resolution. /// ///Type of leaf term identifiers in fact expressions. internal class KnowledgeBase{ private readonly List > _facts; private Vertex _knowledge; private readonly ConversionContext _context; /// /// Initialize a new knowledge base. /// internal KnowledgeBase() { _facts = new List>(); _knowledge = Vertex.One; // we know '1', but nothing else at present _context = IdentifierService .Instance.CreateConversionContext(); } /// /// Adds all facts from another knowledge base /// /// The other knowledge base internal void AddKnowledgeBase(KnowledgeBasekb) { foreach (BoolExpr fact in kb._facts) { AddFact(fact); } } /// /// Adds the given fact to this KB. /// /// Simple fact. internal virtual void AddFact(BoolExprfact) { _facts.Add(fact); Converter converter = new Converter (fact, _context); Vertex factVertex = converter.Vertex; _knowledge = _context.Solver.And(_knowledge, factVertex); } /// /// Adds the given implication to this KB, where implication is of the form: /// /// condition --> implies /// /// Condition /// Entailed expression internal void AddImplication(BoolExprcondition, BoolExpr implies) { AddFact(new Implication(condition, implies)); } /// /// Adds an equivalence to this KB, of the form: /// /// left iff. right /// /// Left operand /// Right operand internal void AddEquivalence(BoolExprleft, BoolExpr right) { AddFact(new Equivalence(left, right)); } public override string ToString() { StringBuilder builder = new StringBuilder(); builder.AppendLine("Facts:"); foreach (BoolExpr fact in _facts) { builder.Append("\t").AppendLine(fact.ToString()); } return builder.ToString(); } // Private class improving debugging output for implication facts // (fact appears as A --> B rather than !A + B) private class Implication : OrExpr { BoolExpr _condition; BoolExpr _implies; // (condition --> implies) iff. (!condition OR implies) internal Implication(BoolExpr condition, BoolExpr implies) : base(condition.MakeNegated(), implies) { _condition = condition; _implies = implies; } public override string ToString() { return StringUtil.FormatInvariant("{0} --> {1}", _condition, _implies); } } // Private class improving debugging output for equivalence facts // (fact appears as A <--> B rather than (!A + B) . (A + !B)) private class Equivalence : AndExpr { BoolExpr _left; BoolExpr _right; // (left iff. right) iff. (left --> right AND right --> left) internal Equivalence(BoolExpr left, BoolExpr right) : base(new Implication(left, right), new Implication(right, left)) { _left = left; _right = right; } public override string ToString() { return StringUtil.FormatInvariant("{0} <--> {1}", _left, _right); } } } } // 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
- Condition.cs
- ClientScriptManagerWrapper.cs
- ImmutableCollection.cs
- MemberDomainMap.cs
- FontUnit.cs
- LineSegment.cs
- MasterPageBuildProvider.cs
- FilteredAttributeCollection.cs
- XmlComment.cs
- PersonalizationProviderHelper.cs
- SerializationAttributes.cs
- invalidudtexception.cs
- NativeMethods.cs
- UnmanagedMemoryStreamWrapper.cs
- XPathItem.cs
- SocketInformation.cs
- unitconverter.cs
- XmlSchemaParticle.cs
- SimplePropertyEntry.cs
- TraceSection.cs
- FormViewInsertEventArgs.cs
- MethodRental.cs
- UriTemplateLiteralQueryValue.cs
- regiisutil.cs
- HttpCookieCollection.cs
- Vector.cs
- SecurityAppliedMessage.cs
- JoinQueryOperator.cs
- VoiceSynthesis.cs
- AssemblyAttributes.cs
- HttpListenerPrefixCollection.cs
- ControlCachePolicy.cs
- TextEditorDragDrop.cs
- TextRangeProviderWrapper.cs
- _UncName.cs
- CompilerErrorCollection.cs
- CreationContext.cs
- VisualTreeFlattener.cs
- SafeEventHandle.cs
- Switch.cs
- XamlContextStack.cs
- DrawingContextWalker.cs
- DBAsyncResult.cs
- ExtendedTransformFactory.cs
- XmlSchemaType.cs
- SubstitutionList.cs
- Utility.cs
- ObjectConverter.cs
- Error.cs
- AuthenticationSection.cs
- DbTypeMap.cs
- ReturnType.cs
- TaskSchedulerException.cs
- PrintPreviewControl.cs
- NavigationPropertyEmitter.cs
- FileUtil.cs
- WindowsListBox.cs
- TraceUtility.cs
- SafeCoTaskMem.cs
- TableCell.cs
- CookieProtection.cs
- StackOverflowException.cs
- IntegerValidator.cs
- AxHost.cs
- FormatterConverter.cs
- WebControl.cs
- TcpProcessProtocolHandler.cs
- InstancePersistenceEvent.cs
- DockProviderWrapper.cs
- CurrentTimeZone.cs
- ArraySegment.cs
- FamilyMap.cs
- RouteValueDictionary.cs
- WindowsEditBoxRange.cs
- XPathSelectionIterator.cs
- CompoundFileReference.cs
- PathSegment.cs
- NameHandler.cs
- figurelength.cs
- PrtCap_Public.cs
- CustomMenuItemCollection.cs
- XslException.cs
- SafeBitVector32.cs
- PointConverter.cs
- SerialErrors.cs
- TrackingLocation.cs
- WaitHandle.cs
- ResXDataNode.cs
- SubclassTypeValidator.cs
- FormClosedEvent.cs
- FixedSchema.cs
- ContractNamespaceAttribute.cs
- InstancePersistenceCommand.cs
- AsymmetricSignatureFormatter.cs
- Literal.cs
- Query.cs
- InputProcessorProfiles.cs
- ListControlDataBindingHandler.cs
- TransformPatternIdentifiers.cs
- TargetException.cs