ColumnMapVisitor.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Query / InternalTrees / ColumnMapVisitor.cs / 1305376 / ColumnMapVisitor.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

namespace System.Data.Query.InternalTrees 
{
    using System.Collections;
    using System.Collections.Generic;
    using System.Text; 
    using System.Data;
    using System.Data.Common; 
    using System.Data.Common.CommandTrees; 
    using System.Data.Metadata.Edm;
    using System.Data.Query.PlanCompiler; 
    using System.Diagnostics;
    using System.IO;
    using System.Threading;
 
    /// 
    /// Basic Visitor Design Pattern support for ColumnMap hierarchy; 
    /// 
    /// This visitor class will walk the entire hierarchy, but does not
    /// return results; it's useful for operations such as printing and 
    /// searching.
    /// 
    /// 
    internal abstract class ColumnMapVisitor 
    {
        #region visitor helpers 
 
        /// 
        /// Common List(ColumnMap) code 
        /// 
        /// 
        /// 
        protected void VisitList(TListType[] columnMaps, TArgType arg) 
                   where TListType : ColumnMap
        { 
            foreach (TListType columnMap in columnMaps) 
            {
                columnMap.Accept(this, arg); 
            }
        }

        #endregion 

        #region EntityIdentity handling 
 
        protected void VisitEntityIdentity(EntityIdentity entityIdentity, TArgType arg)
        { 
            DiscriminatedEntityIdentity dei = entityIdentity as DiscriminatedEntityIdentity;
            if (null != dei)
            {
                VisitEntityIdentity(dei, arg); 
            }
            else 
            { 
                VisitEntityIdentity((SimpleEntityIdentity)entityIdentity, arg);
            } 
        }

        protected virtual void VisitEntityIdentity(DiscriminatedEntityIdentity entityIdentity, TArgType arg)
        { 
            entityIdentity.EntitySetColumnMap.Accept(this, arg);
            foreach (SimpleColumnMap columnMap in entityIdentity.Keys) 
            { 
                columnMap.Accept(this, arg);
            } 
        }

        protected virtual void VisitEntityIdentity(SimpleEntityIdentity entityIdentity, TArgType arg)
        { 
            foreach (SimpleColumnMap columnMap in entityIdentity.Keys)
            { 
                columnMap.Accept(this, arg); 
            }
        } 

        #endregion

        #region Visitor methods 

        internal virtual void Visit(ComplexTypeColumnMap columnMap, TArgType arg) 
        { 
            ColumnMap nullSentinel = columnMap.NullSentinel;
            if (null != nullSentinel) 
            {
                nullSentinel.Accept(this, arg);
            }
            foreach (ColumnMap p in columnMap.Properties) 
            {
                p.Accept(this, arg); 
            } 
        }
 
        internal virtual void Visit(DiscriminatedCollectionColumnMap columnMap, TArgType arg)
        {
            columnMap.Discriminator.Accept(this, arg);
            foreach (SimpleColumnMap fk in columnMap.ForeignKeys) 
            {
                fk.Accept(this, arg); 
            } 
            foreach (SimpleColumnMap k in columnMap.Keys)
            { 
                k.Accept(this, arg);
            }
            columnMap.Element.Accept(this, arg);
        } 

        internal virtual void Visit(EntityColumnMap columnMap, TArgType arg) 
        { 
            VisitEntityIdentity(columnMap.EntityIdentity, arg);
            foreach (ColumnMap p in columnMap.Properties) 
            {
                p.Accept(this, arg);
            }
        } 

        internal virtual void Visit(SimplePolymorphicColumnMap columnMap, TArgType arg) 
        { 
            columnMap.TypeDiscriminator.Accept(this, arg);
            foreach (ColumnMap cm in columnMap.TypeChoices.Values) 
            {
                cm.Accept(this, arg);
            }
            foreach (ColumnMap p in columnMap.Properties) 
            {
                p.Accept(this, arg); 
            } 
        }
 
        internal virtual void Visit(MultipleDiscriminatorPolymorphicColumnMap columnMap, TArgType arg)
        {
            foreach (var typeDiscriminator in columnMap.TypeDiscriminators)
            { 
                typeDiscriminator.Accept(this, arg);
            } 
            foreach (var typeColumnMap in columnMap.TypeChoices.Values) 
            {
                typeColumnMap.Accept(this, arg); 
            }
            foreach (var property in columnMap.Properties)
            {
                property.Accept(this, arg); 
            }
        } 
 
        internal virtual void Visit(RecordColumnMap columnMap, TArgType arg)
        { 
            ColumnMap nullSentinel = columnMap.NullSentinel;
            if (null != nullSentinel)
            {
                nullSentinel.Accept(this, arg); 
            }
            foreach (ColumnMap p in columnMap.Properties) 
            { 
                p.Accept(this, arg);
            } 
        }

        internal virtual void Visit(RefColumnMap columnMap, TArgType arg)
        { 
            VisitEntityIdentity(columnMap.EntityIdentity, arg);
        } 
 
        internal virtual void Visit(ScalarColumnMap columnMap, TArgType arg)
        { 
        }

        internal virtual void Visit(SimpleCollectionColumnMap columnMap, TArgType arg)
        { 
            foreach (SimpleColumnMap fk in columnMap.ForeignKeys)
            { 
                fk.Accept(this, arg); 
            }
            foreach (SimpleColumnMap k in columnMap.Keys) 
            {
                k.Accept(this, arg);
            }
            columnMap.Element.Accept(this, arg); 
        }
 
        internal virtual void Visit(VarRefColumnMap columnMap, TArgType arg) 
        {
        } 

        #endregion
    }
 
    /// 
    /// Basic Visitor Design Pattern support for ColumnMap hierarchy; 
    /// 
    /// This visitor class allows you to return results; it's useful for operations
    /// that copy or manipulate the hierarchy. 
    /// 
    /// 
    /// 
    internal abstract class ColumnMapVisitorWithResults 
    {
 
        #region EntityIdentity handling 

        protected EntityIdentity VisitEntityIdentity(EntityIdentity entityIdentity, TArgType arg) 
        {
            DiscriminatedEntityIdentity dei = entityIdentity as DiscriminatedEntityIdentity;
            if (null != dei)
            { 
                return VisitEntityIdentity(dei, arg);
            } 
            else 
            {
                return VisitEntityIdentity((SimpleEntityIdentity)entityIdentity, arg); 
            }
        }

        protected virtual EntityIdentity VisitEntityIdentity(DiscriminatedEntityIdentity entityIdentity, TArgType arg) 
        {
            return entityIdentity; 
        } 

        protected virtual EntityIdentity VisitEntityIdentity(SimpleEntityIdentity entityIdentity, TArgType arg) 
        {
            return entityIdentity;
        }
 
        #endregion
 
        #region Visitor methods 

        internal abstract TResultType Visit(ComplexTypeColumnMap columnMap, TArgType arg); 

        internal abstract TResultType Visit(DiscriminatedCollectionColumnMap columnMap, TArgType arg);

        internal abstract TResultType Visit(EntityColumnMap columnMap, TArgType arg); 

        internal abstract TResultType Visit(SimplePolymorphicColumnMap columnMap, TArgType arg); 
 
        internal abstract TResultType Visit(RecordColumnMap columnMap, TArgType arg);
 
        internal abstract TResultType Visit(RefColumnMap columnMap, TArgType arg);

        internal abstract TResultType Visit(ScalarColumnMap columnMap, TArgType arg);
 
        internal abstract TResultType Visit(SimpleCollectionColumnMap columnMap, TArgType arg);
 
        internal abstract TResultType Visit(VarRefColumnMap columnMap, TArgType arg); 

        internal abstract TResultType Visit(MultipleDiscriminatorPolymorphicColumnMap columnMap, TArgType arg); 

        #endregion
    }
 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ColumnMapVisitor.cs source code in C# .NET

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