EntityProviderServices.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 / EntityClient / EntityProviderServices.cs / 1305376 / EntityProviderServices.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....]
// @backupOwner [....] 
//----------------------------------------------------------------------------- 

namespace System.Data.EntityClient { 

    using System.Collections.Generic;
    using System.Data.Common.CommandTrees;
    using System.Data.Common; 
    using System.IO;
    using System.Xml; 
    using System.Data.Metadata.Edm; 
    using System.Diagnostics;
 
    /// 
    /// The class for provider services of the entity client
    /// 
    internal sealed class EntityProviderServices : DbProviderServices { 

        ///  
        /// Singleton object; 
        /// 
        internal static readonly EntityProviderServices Instance = new EntityProviderServices(); 

        /// 
        /// Create a Command Definition object, given the connection and command tree
        ///  
        /// connection to the underlying provider
        /// command tree for the statement 
        /// an exectable command definition object 
        /// connection and commandTree arguments must not be null
        protected override DbCommandDefinition CreateDbCommandDefinition(DbProviderManifest providerManifest, DbCommandTree commandTree) { 
            EntityUtil.CheckArgumentNull(providerManifest, "providerManifest");
            EntityUtil.CheckArgumentNull(commandTree, "commandTree");

            StoreItemCollection storeMetadata = (StoreItemCollection)commandTree.MetadataWorkspace.GetItemCollection(DataSpace.SSpace); 
            return this.CreateCommandDefinition(storeMetadata.StoreProviderFactory, commandTree);
        } 
 
        internal EntityCommandDefinition CreateCommandDefinition(DbProviderFactory storeProviderFactory, DbCommandTree commandTree) {
            EntityUtil.CheckArgumentNull(storeProviderFactory, "storeProviderFactory"); 
            Debug.Assert(commandTree != null, "Command Tree cannot be null");

            return new EntityCommandDefinition(storeProviderFactory, commandTree);
        } 

        ///  
        /// Ensures that the data space of the specified command tree is the model (C-) space 
        /// 
        /// The command tree for which the data space should be validated 
        internal override void ValidateDataSpace(DbCommandTree commandTree)
        {
            Debug.Assert(commandTree != null, "Ensure command tree is non-null before calling ValidateDataSpace");
 
            if (commandTree.DataSpace != DataSpace.CSpace)
            { 
                throw EntityUtil.ProviderIncompatible(Entity.Strings.EntityClient_RequiresNonStoreCommandTree); 
            }
        } 

        /// 
        /// Create a EntityCommandDefinition object based on the prototype command
        /// This method is intended for provider writers to build a default command definition 
        /// from a command.
        ///  
        ///  
        /// 
        /// prototype argument must not be null 
        /// prototype argument must be a EntityCommand
        public override DbCommandDefinition CreateCommandDefinition(DbCommand prototype) {
            EntityUtil.CheckArgumentNull(prototype, "prototype");
            return ((EntityCommand)prototype).GetCommandDefinition(); 
        }
 
        protected override string GetDbProviderManifestToken(DbConnection connection) 
        {
            EntityUtil.CheckArgumentNull(connection, "connection"); 
            if (connection.GetType() != typeof(EntityConnection))
            {
                throw EntityUtil.Argument(System.Data.Entity.Strings.Mapping_Provider_WrongConnectionType(typeof(EntityConnection)));
            } 

            return MetadataItem.EdmProviderManifest.Token; 
        } 

        protected override DbProviderManifest GetDbProviderManifest(string versionHint) 
        {
            EntityUtil.CheckArgumentNull(versionHint, "versionHint");
            return MetadataItem.EdmProviderManifest;
        } 
    }
} 

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

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