[Nhibernate-commit] SF.net SVN: nhibernate:[5276] trunk/nhibernate/src/NHibernate

[<pa...@us...>]

Revision: 5276
          http://nhibernate.svn.sourceforge.net/nhibernate/?rev=5276&view=rev
Author:   patearl
Date:     2010-11-28 03:37:31 +0000 (Sun, 28 Nov 2010)

Log Message:
-----------
Linq: Added an expression visitor that provides access to parent nodes while visiting.

Modified Paths:
--------------
    trunk/nhibernate/src/NHibernate/NHibernate.csproj

Added Paths:
-----------
    trunk/nhibernate/src/NHibernate/Linq/Visitors/ContextualNhExpressionTreeVisitor.cs
    trunk/nhibernate/src/NHibernate/Linq/Visitors/VisitorContext.cs

Added: trunk/nhibernate/src/NHibernate/Linq/Visitors/ContextualNhExpressionTreeVisitor.cs
===================================================================
--- trunk/nhibernate/src/NHibernate/Linq/Visitors/ContextualNhExpressionTreeVisitor.cs	                        (rev 0)
+++ trunk/nhibernate/src/NHibernate/Linq/Visitors/ContextualNhExpressionTreeVisitor.cs	2010-11-28 03:37:31 UTC (rev 5276)
@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Text;
+using NHibernate.Linq.Visitors;
+
+namespace NHibernate.Linq
+{
+	public class ContextualNhExpressionTreeVisitor : NhExpressionTreeVisitor
+	{
+		private Stack<VisitorContext> _contextStack;
+
+		public ContextualNhExpressionTreeVisitor()
+		{
+			_contextStack = new Stack<VisitorContext>();
+			_contextStack.Push(null);
+		}
+
+		public override Expression VisitExpression(Expression expression)
+		{
+			if (expression == null)
+				return null;
+
+			VisitorContext context = new VisitorContext(_contextStack.Peek(), expression);
+			_contextStack.Push(context);
+
+			Expression result = base.VisitExpression(expression);
+
+			_contextStack.Pop();
+
+			return result;
+		}
+
+		protected VisitorContext Context
+		{
+			get { return _contextStack.Peek(); }
+		}
+	}
+}

Added: trunk/nhibernate/src/NHibernate/Linq/Visitors/VisitorContext.cs
===================================================================
--- trunk/nhibernate/src/NHibernate/Linq/Visitors/VisitorContext.cs	                        (rev 0)
+++ trunk/nhibernate/src/NHibernate/Linq/Visitors/VisitorContext.cs	2010-11-28 03:37:31 UTC (rev 5276)
@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Text;
+
+namespace NHibernate.Linq.Visitors
+{
+	public class VisitorContext
+	{
+		public VisitorContext(VisitorContext parent, Expression expression)
+		{
+			Parent = parent;
+			Expression = expression;
+		}
+
+		public VisitorContext Parent { get; private set; }
+		public Expression Expression { get; private set; }
+	}
+}

Modified: trunk/nhibernate/src/NHibernate/NHibernate.csproj
===================================================================
--- trunk/nhibernate/src/NHibernate/NHibernate.csproj	2010-11-26 04:02:34 UTC (rev 5275)
+++ trunk/nhibernate/src/NHibernate/NHibernate.csproj	2010-11-28 03:37:31 UTC (rev 5276)
@@ -241,6 +241,8 @@
     <Compile Include="ISessionFactory.cs" />
     <Compile Include="ITransaction.cs" />
     <Compile Include="LazyInitializationException.cs" />
+    <Compile Include="Linq\Visitors\ContextualNhExpressionTreeVisitor.cs" />
+    <Compile Include="Linq\Visitors\VisitorContext.cs" />
     <Compile Include="Loader\Loader.cs" />
     <Compile Include="Loader\OuterJoinLoader.cs" />
     <Compile Include="LockMode.cs" />


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