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//---------------------------------------------------------------------
// <copyright file="ColumnMapVisitorWithResults.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
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;
/// <summary>
/// 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.
/// </summary>
/// <typeparam name="TArgType"></typeparam>
internal abstract class ColumnMapVisitor<TArgType>
{
#region visitor helpers
/// <summary>
/// Common List(ColumnMap) code
/// </summary>
/// <param name="columnMaps"></param>
/// <param name="arg"></param>
protected void VisitList<TListType>(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
}
/// <summary>
/// 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.
/// </summary>
/// <typeparam name="TArgType"></typeparam>
/// <typeparam name="TResultType"></typeparam>
internal abstract class ColumnMapVisitorWithResults<TResultType, TArgType>
{
#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
}
}
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