CqlIdentifiers.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / CqlGeneration / CqlIdentifiers.cs / 1 / 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);
        } 
 
        internal void AddIdentifier(string identifier) {
            m_identifiers.Add(identifier.ToLower(CultureInfo.InvariantCulture)); 
        }

        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.
//---------------------------------------------------------------------- 
// 
//      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);
        } 
 
        internal void AddIdentifier(string identifier) {
            m_identifiers.Add(identifier.ToLower(CultureInfo.InvariantCulture)); 
        }

        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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CqlIdentifiers.cs source code in C# .NET

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