OptionalColumn.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 / SqlClient / SqlGen / OptionalColumn.cs / 1305376 / OptionalColumn.cs
                        

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

namespace System.Data.SqlClient.SqlGen
{ 
    /// 
    /// Represents a column in a select list that should be printed only if it is later used. 
    /// Such columns get added by . 
    /// The SymbolUsageManager associated with the OptionalColumn has the information whether the column
    /// has been used based on its symbol. 
    /// 
    internal sealed class OptionalColumn
    {
        #region Private State 
        private readonly SymbolUsageManager m_usageManager;
 
        // The SqlBuilder that contains the column building blocks (e.g: "c.X as X1") 
        private readonly SqlBuilder m_builder = new SqlBuilder();
 
        // The symbol representing the optional column
        private readonly Symbol m_symbol;
        #endregion
 
        #region Internal Methods
        ///  
        /// Append to the "fragment" representing this column 
        /// 
        internal void Append(object s) 
        {
            m_builder.Append(s);
        }
 
        internal void MarkAsUsed()
        { 
            this.m_usageManager.MarkAsUsed(this.m_symbol); 
        }
        #endregion 

        #region Constructor
        internal OptionalColumn(SymbolUsageManager usageManager, Symbol symbol)
        { 
            this.m_usageManager = usageManager;
            this.m_symbol = symbol; 
        } 
        #endregion
 
        #region Internal members

        /// 
        /// Writes that fragment that represents the optional column 
        /// if the usage manager says it is used.
        ///  
        ///  
        /// 
        public bool WriteSqlIfUsed(SqlWriter writer, SqlGenerator sqlGenerator, string separator) 
        {
            if (m_usageManager.IsUsed(m_symbol))
            {
                writer.Write(separator); 
                m_builder.WriteSql(writer, sqlGenerator);
                return true; 
            } 
            return false;
        } 
        #endregion
    }
}

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

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