Facet.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / Edm / Facet.cs / 1305376 / Facet.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections.Generic;
using System.Data.Common;
using System.Text;
using System.Diagnostics; 
using System.Data.Entity;
using System.Globalization; 
 
namespace System.Data.Metadata.Edm
{ 
    /// 
    /// Class for representing a Facet object
    /// This object is Immutable (not just set to readonly) and
    /// some parts of the system are depending on that behavior 
    /// 
    [DebuggerDisplay("{Name,nq}={Value}")] 
    public sealed class Facet : MetadataItem 
    {
        #region Constructors 

        /// 
        /// The constructor for constructing a Facet object with the facet description and a value
        ///  
        /// The object describing this facet
        /// The value of the facet 
        /// Thrown if facetDescription argument is null 
        private Facet(FacetDescription facetDescription, object value)
            :base(MetadataFlags.Readonly) 
        {
            EntityUtil.GenericCheckArgumentNull(facetDescription, "facetDescription");

            _facetDescription = facetDescription; 
            _value = value;
        } 
 
        /// 
        /// Creates a Facet instance with the specified value for the given 
        /// facet description.
        /// 
        /// The object describing this facet
        /// The value of the facet 
        /// Thrown if facetDescription argument is null
        internal static Facet Create(FacetDescription facetDescription, object value) 
        { 
            return Create(facetDescription, value, false);
        } 

        /// 
        /// Creates a Facet instance with the specified value for the given
        /// facet description. 
        /// 
        /// The object describing this facet 
        /// The value of the facet 
        /// true to bypass caching and known values; false otherwise.
        /// Thrown if facetDescription argument is null 
        internal static Facet Create(FacetDescription facetDescription, object value, bool bypassKnownValues)
        {
            EntityUtil.CheckArgumentNull(facetDescription, "facetDescription");
 
            if (!bypassKnownValues)
            { 
                // Reuse facets with a null value. 
                if (object.ReferenceEquals(value, null))
                { 
                    return facetDescription.NullValueFacet;
                }

                // Reuse facets with a default value. 
                if (object.Equals(facetDescription.DefaultValue, value))
                { 
                    return facetDescription.DefaultValueFacet; 
                }
 
                // Special case boolean facets.
                if (facetDescription.FacetType.Identity == "Edm.Boolean")
                {
                    bool boolValue = (bool)value; 
                    return facetDescription.GetBooleanFacet(boolValue);
                } 
            } 

            Facet result = new Facet(facetDescription, value); 

            // Check the type of the value only if we know what the correct CLR type is
            if (value != null && !Helper.IsUnboundedFacetValue(result) && result.FacetType.ClrType != null)
            { 
                Type valueType = value.GetType();
                Debug.Assert( 
                    valueType == result.FacetType.ClrType 
                    || result.FacetType.ClrType.IsAssignableFrom(valueType),
                    string.Format(CultureInfo.CurrentCulture, "The facet {0} has type {1}, but a value of type {2} was supplied.", result.Name, result.FacetType.ClrType, valueType) 
                );
            }

            return result; 
        }
 
        #endregion 

        #region Fields 

        /// The object describing this facet.
        private readonly FacetDescription _facetDescription;
 
        /// The value assigned to this facet.
        private readonly object _value; 
 
        #endregion
 
        #region Properties

        /// 
        /// Returns the kind of the type 
        /// 
        public override BuiltInTypeKind BuiltInTypeKind { get { return BuiltInTypeKind.Facet; } } 
 
        /// 
        /// Gets the description object for describing the facet 
        /// 
        public FacetDescription Description
        {
            get 
            {
                return _facetDescription; 
            } 
        }
 
        /// 
        /// Gets/Sets the name of the facet
        /// 
        [MetadataProperty(PrimitiveTypeKind.String, false)] 
        public String Name
        { 
            get 
            {
                return _facetDescription.FacetName; 
            }
        }

        ///  
        /// Gets/Sets the type of the facet
        ///  
        [MetadataProperty(BuiltInTypeKind.EdmType, false)] 
        public EdmType FacetType
        { 
            get
            {
                return _facetDescription.FacetType;
            } 
        }
 
        ///  
        /// Gets/Sets the value of the facet
        ///  
        /// Thrown if the Facet instance is in ReadOnly state
        [MetadataProperty(typeof(Object), false)]
        public Object Value
        { 
            get
            { 
                return _value; 
            }
        } 

        /// 
        /// Gets the identity for this item as a string
        ///  
        internal override string Identity
        { 
            get 
            {
                return _facetDescription.FacetName; 
            }
        }

        ///  
        /// Indicates whether the value of the facet is unbounded
        ///  
        public bool IsUnbounded 
        {
            get 
            {
                return object.ReferenceEquals(Value, EdmConstants.UnboundedValue);
            }
        } 
        #endregion
 
        #region Methods 
        /// 
        /// Overriding System.Object.ToString to provide better String representation 
        /// for this type.
        /// 
        public override string ToString()
        { 
            return this.Name;
        } 
        #endregion 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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Facet.cs source code in C# .NET

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