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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / Utils / Boolean / DomainConstraint.cs / 1305376 / DomainConstraint.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 { ////// Represents a variable with finite domain, e.g., c in {1, 2, 3} /// ///Type of domain variables (int in the above example). ///Type of the identifier (c above -- it need not be int). internal class DomainVariable{ private readonly T_Variable _identifier; private readonly Set _domain; private readonly int _hashCode; private readonly IEqualityComparer _identifierComparer; /// /// Constructs a new domain variable. /// /// Identifier /// Domain of variable. /// Comparer of identifier internal DomainVariable(T_Variable identifier, Setdomain, IEqualityComparer identifierComparer) { Debug.Assert(null != identifier && null != domain); _identifier = identifier; _domain = domain.AsReadOnly(); _identifierComparer = identifierComparer ?? EqualityComparer .Default; int domainHashCode = _domain.GetElementsHashCode(); int identifierHashCode = _identifierComparer.GetHashCode(_identifier); _hashCode = domainHashCode ^ identifierHashCode; } internal DomainVariable(T_Variable identifier, Set domain) : this(identifier, domain, null) { } /// /// Gets the variable. /// internal T_Variable Identifier { get { return _identifier; } } ////// Gets the domain of this variable. /// internal SetDomain { get { return _domain; } } public override int GetHashCode() { return _hashCode; } public override bool Equals(object obj) { if (Object.ReferenceEquals(this, obj)) { return true; } DomainVariable other = obj as DomainVariable ; if (null == other) { return false; } if (_hashCode != other._hashCode) { return false; } return (_identifierComparer.Equals(_identifier, other._identifier) && _domain.SetEquals(other._domain)); } public override string ToString() { return StringUtil.FormatInvariant("{0}{{{1}}}", _identifier.ToString(), _domain); } } /// /// Represents a constraint of the form: /// /// Var1 in Range /// ///Type of range elements. ///Type of the variable. internal class DomainConstraint{ private readonly DomainVariable _variable; private readonly Set _range; private readonly int _hashCode; /// /// Constructs a new constraint for the given variable and range. /// /// Variable in constraint. /// Range of constraint. internal DomainConstraint(DomainVariablevariable, Set range) { Debug.Assert(null != variable && null != range); _variable = variable; _range = range.AsReadOnly(); _hashCode = _variable.GetHashCode() ^ _range.GetElementsHashCode(); } /// /// Constructor supporting a singleton range domain constraint /// internal DomainConstraint(DomainVariablevariable, T_Element element) : this(variable, new Set (new T_Element[] { element }).MakeReadOnly()) { } /// /// Gets the variable for this constraint. /// internal DomainVariableVariable { get { return _variable; } } /// /// Get the range for this constraint. /// internal SetRange { get { return _range; } } /// /// Inverts this constraint (this iff. !result) /// !(Var in Range) iff. Var in (Var.Domain - Range) /// ///internal DomainConstraint InvertDomainConstraint() { return new DomainConstraint (_variable, _variable.Domain.Difference(_range).AsReadOnly()); } public override bool Equals(object obj) { if (Object.ReferenceEquals(this, obj)) { return true; } DomainConstraint other = obj as DomainConstraint ; if (null == other) { return false; } if (_hashCode != other._hashCode) { return false; } return (_range.SetEquals(other._range) && _variable.Equals(other._variable)); } public override int GetHashCode() { return _hashCode; } public override string ToString() { return StringUtil.FormatInvariant("{0} in [{1}]", _variable, _range); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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