DbFunctionCommandTree.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 / Common / CommandTrees / DbFunctionCommandTree.cs / 1305376 / DbFunctionCommandTree.cs

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

using System; 
using System.Collections.Generic;

using System.Data.Metadata.Edm;
using System.Data.Common.CommandTrees.Internal; 
using System.Linq;
 
namespace System.Data.Common.CommandTrees 
{
 
    /// 
    /// Represents a function invocation expressed as a canonical command tree
    /// 
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")] 
    public sealed class DbFunctionCommandTree : DbCommandTree
    { 
        private readonly EdmFunction _edmFunction; 
        private readonly TypeUsage _resultType;
        private readonly System.Collections.ObjectModel.ReadOnlyCollection _parameterNames; 
        private readonly System.Collections.ObjectModel.ReadOnlyCollection _parameterTypes;

        /// 
        /// Constructs a new DbFunctionCommandTree that uses the specified metadata workspace, data space and function metadata 
        /// 
        /// The metadata workspace that the command tree should use. 
        /// The logical 'space' that metadata in the expressions used in this command tree must belong to. 
        /// 
        ///  
        /// 
        /// ,  or  is null
        ///  does not represent a valid data space or
        /// is a composable function 
        /*CQT_PUBLIC_API(*/internal/*)*/ DbFunctionCommandTree(MetadataWorkspace metadata, DataSpace dataSpace, EdmFunction edmFunction, TypeUsage resultType, IEnumerable> parameters)
            : base(metadata, dataSpace) 
        { 
            using (new EntityBid.ScopeAuto(" %d#", this.ObjectId))
            { 
                EntityUtil.CheckArgumentNull(edmFunction, "edmFunction");

                _edmFunction = edmFunction;
                _resultType = resultType; 

                List paramNames = new List(); 
                List paramTypes = new List(); 
                if (parameters != null)
                { 
                    foreach (KeyValuePair paramInfo in parameters)
                    {
                        paramNames.Add(paramInfo.Key);
                        paramTypes.Add(paramInfo.Value); 
                    }
                } 
 
                _parameterNames = paramNames.AsReadOnly();
                _parameterTypes = paramTypes.AsReadOnly(); 
            }
        }

        ///  
        /// Gets the  that represents the function to invoke
        ///  
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "Edm")] 
        public EdmFunction EdmFunction
        { 
            get
            {
                return _edmFunction;
            } 
        }
 
        ///  
        /// Gets the result type of the function; currently constrained to be a Collection of
        /// RowTypes. Unlike typical RowType instance, merely indicates name/type not parameter 
        /// order.
        /// 
        public TypeUsage ResultType
        { 
            get
            { 
                return _resultType; 
            }
        } 

        internal override DbCommandTreeKind CommandTreeKind
        {
            get { return DbCommandTreeKind.Function; } 
        }
 
        internal override IEnumerable> GetParameters() 
        {
            for (int idx = 0; idx < this._parameterNames.Count; idx++) 
            {
                yield return new KeyValuePair(this._parameterNames[idx], this._parameterTypes[idx]);
            }
        } 

        internal override void DumpStructure(ExpressionDumper dumper) 
        { 
            if (this.EdmFunction != null)
            { 
                dumper.Dump(this.EdmFunction);
            }
        }
 
        internal override string PrintTree(ExpressionPrinter printer)
        { 
            return printer.Print(this); 
        }
    } 
}

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

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