CqlIdentifiers.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 / Map / ViewGeneration / CqlGeneration / CqlIdentifiers.cs / 1305376 / CqlIdentifiers.cs
                        

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

 
using System.Data.Common.Utils;
using System.Text;
using System.Collections.Generic;
using System.Diagnostics; 
using System.Globalization;
namespace System.Data.Mapping.ViewGeneration.Structures 
{ 

    // This class is responsible for ensuring unique aliases for _from0, etc 
    // and block aliases T, T0, T1, etc
    internal class CqlIdentifiers : InternalBase
    {
 
        #region Constructor
        internal CqlIdentifiers() 
        { 
            m_identifiers = new Set(StringComparer.Ordinal);
        } 
        #endregion

        #region Fields
        private Set m_identifiers; 
        #endregion
 
        #region Methods 
        // effects: Given a number, returns _from if it does not clashes with
        // any identifier, else returns _from__ where  is the first number from 0 
        // where there is no clash
        internal string GetFromVariable(int num)
        {
            return GetNonConflictingName("_from", num); 
        }
 
        // effects: Given a number, returns T if it does not clashes with 
        // any identifier, else returns T__ where  is the first number from 0
        // where there is no clash 
        internal string GetBlockAlias(int num)
        {
            return GetNonConflictingName("T", num);
        } 

        // effects: Given a number, returns T if it does not clashes with 
        // any identifier, else returns T_ where  is the first number from 0 
        // where there is no clash
        internal string GetBlockAlias() 
        {
            return GetNonConflictingName("T", -1);
        }
 
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Globalization", "CA1308:NormalizeStringsToUppercase")]
        internal void AddIdentifier(string identifier) 
        { 
            m_identifiers.Add(identifier.ToLower(CultureInfo.InvariantCulture));
        } 

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Globalization", "CA1308:NormalizeStringsToUppercase")]
        private string GetNonConflictingName(string prefix, int number)
        { 
            // Do a case sensitive search but return the string that uses the
            // original prefix 
            string result = number < 0 ? prefix : StringUtil.FormatInvariant("{0}{1}", prefix, number); 
            // Check if the prefix exists or not
            if (m_identifiers.Contains(result.ToLower(CultureInfo.InvariantCulture)) == false) 
            {
                return result;
            }
 
            // Go through integers and find the first one that does not clash
            for (int count = 0; count < int.MaxValue; count++) 
            { 
                if (number < 0)
                { 
                    result = StringUtil.FormatInvariant("{0}_{1}", prefix, count);
                }
                else
                { 
                    result = StringUtil.FormatInvariant("{0}_{1}_{2}", prefix, count, number);
                } 
                if (m_identifiers.Contains(result.ToLower(CultureInfo.InvariantCulture)) == false) 
                {
                    return result; 
                }
            }
            Debug.Fail("Found no unique _from till MaxValue?");
            return null; 
        }
 
        internal override void ToCompactString(StringBuilder builder) 
        {
            m_identifiers.ToCompactString(builder); 
        }

        #endregion
    } 
}

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

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