CollectionType.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / Edm / CollectionType.cs / 1305376 / CollectionType.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 
using System;
using System.Collections.Generic; 
using System.Data.Common;
using System.Text;

namespace System.Data.Metadata.Edm 
{
    ///  
    /// Represents the Edm Collection Type 
    /// 
    public sealed class CollectionType : EdmType 
    {
        #region Constructors
        /// 
        /// The constructor for constructing a CollectionType object with the element type it contains 
        /// 
        /// The element type that this collection type contains 
        /// Thrown if the argument elementType is null 
        internal CollectionType(EdmType elementType)
            : this(TypeUsage.Create(elementType)) 
        {
            this.DataSpace = elementType.DataSpace;
        }
 
        /// 
        /// The constructor for constructing a CollectionType object with the element type (as a TypeUsage) it contains 
        ///  
        /// The element type that this collection type contains
        /// Thrown if the argument elementType is null 
        internal CollectionType(TypeUsage elementType)
            : base(GetIdentity(EntityUtil.GenericCheckArgumentNull(elementType, "elementType")),
                    EdmConstants.TransientNamespace, elementType.EdmType.DataSpace)
        { 
            _typeUsage = elementType;
            SetReadOnly(); 
        } 
        #endregion
 
        #region Fields
        private readonly TypeUsage _typeUsage;
        #endregion
 
        #region Properties
        ///  
        /// Returns the kind of the type 
        /// 
        public override BuiltInTypeKind BuiltInTypeKind { get { return BuiltInTypeKind.CollectionType; } } 

        /// 
        /// The type of the element that this collection type contains
        ///  
        [MetadataProperty(BuiltInTypeKind.TypeUsage, false)]
        public TypeUsage TypeUsage 
        { 
            get
            { 
                return _typeUsage;
            }
        }
        #endregion 

        #region Methods 
        ///  
        /// Constructs the name of the collection type
        ///  
        /// The typeusage for the element type that this collection type refers to
        /// The identity of the resulting collection type
        private static string GetIdentity(TypeUsage typeUsage)
        { 
            StringBuilder builder = new StringBuilder(50);
            builder.Append("collection["); 
            typeUsage.BuildIdentity(builder); 
            builder.Append("]");
            return builder.ToString(); 
        }

        /// 
        /// Override EdmEquals to support value comparison of TypeUsage property 
        /// 
        ///  
        ///  
        internal override bool EdmEquals(MetadataItem item)
        { 
            // short-circuit if this and other are reference equivalent
            if (Object.ReferenceEquals(this, item)) { return true; }

            // check type of item 
            if (null == item || BuiltInTypeKind.CollectionType != item.BuiltInTypeKind) { return false; }
            CollectionType other = (CollectionType)item; 
 
            // compare type usage
            return this.TypeUsage.EdmEquals(other.TypeUsage); 
        }
        #endregion
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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