DomainConstraint.cs source code in C# .NET

                        Code:
                         / 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, Set domain, 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 Set Domain { 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(DomainVariable variable, 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(DomainVariable variable, T_Element element)
            : this(variable, new Set(new T_Element[] { element }).MakeReadOnly()) 
        {
        }

        ///  
        /// Gets the variable for this constraint.
        ///  
        internal DomainVariable Variable { get { return _variable; } } 

        ///  
        /// Get the range for this constraint.
        /// 
        internal Set Range { 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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DomainConstraint.cs source code in C# .NET

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