Aggregates.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 / Aggregates.cs / 1305376 / Aggregates.cs
                        

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

using System; 
using System.Data.Common;
using System.Collections.Generic;
using System.Data.Metadata.Edm;
using System.Data.Common.CommandTrees.Internal; 
using System.Diagnostics;
 
namespace System.Data.Common.CommandTrees 
{
    ///  
    /// Aggregates are pseudo-expressions. They look and feel like expressions, but
    /// are severely restricted in where they can appear - only in the aggregates clause
    /// of a group-by expression.
    ///  
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
    public abstract class DbAggregate 
    { 
        private readonly DbExpressionList _args;
        private readonly TypeUsage _type; 

        internal DbAggregate(TypeUsage resultType, DbExpressionList arguments)
        {
            Debug.Assert(resultType != null, "DbAggregate.ResultType cannot be null"); 
            Debug.Assert(arguments != null, "DbAggregate.Arguments cannot be null");
            Debug.Assert(arguments.Count == 1, "DbAggregate requires a single argument"); 
 
            this._type = resultType;
            this._args = arguments; 
        }

        /// 
        /// Gets the result type of this aggregate 
        /// 
        public TypeUsage ResultType 
        { 
            get { return _type; }
        } 

        /// 
        /// Gets the list of expressions that define the arguments to the aggregate.
        ///  
        public IList Arguments { get { return _args; } }
    } 
 
    /// 
    /// The aggregate type that corresponds to exposing the collection of elements that comprise a group 
    /// 
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
    public sealed class DbGroupAggregate : DbAggregate
    { 
        internal DbGroupAggregate(TypeUsage resultType, DbExpressionList arguments)
            : base(resultType, arguments) 
        { 
        }
    } 

    /// 
    /// The aggregate type that corresponds to the invocation of an aggregate function.
    ///  
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
    public sealed class DbFunctionAggregate : DbAggregate 
    { 
        private bool _distinct;
        EdmFunction _aggregateFunction; 

        internal DbFunctionAggregate(TypeUsage resultType, DbExpressionList arguments, EdmFunction function, bool isDistinct)
            : base(resultType, arguments)
        { 
            Debug.Assert(function != null, "DbFunctionAggregate.Function cannot be null");
 
            _aggregateFunction = function; 
            _distinct = isDistinct;
        } 

        /// 
        /// Gets a value indicating whether the aggregate function is applied in a distinct fashion
        ///  
        public bool Distinct { get { return _distinct; } }
 
        ///  
        /// Gets the method metadata that specifies the aggregate function to invoke.
        ///  
        public EdmFunction Function { get { return _aggregateFunction; } }
    }
}

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

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