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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Activities.XamlIntegration
{
using System.Activities.Expressions;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Reflection;
class ExpressionTreeRewriter : ExpressionVisitor
{
IList<LocationReference> locationReferences;
public ExpressionTreeRewriter()
{
}
public ExpressionTreeRewriter(IList<LocationReference> locationReferences)
{
this.locationReferences = locationReferences;
}
protected override Expression VisitMember(MemberExpression node)
{
Expression newNode = null;
if (node.Expression != null && node.Expression.NodeType == ExpressionType.Constant)
{
ConstantExpression constExpr = (ConstantExpression)node.Expression;
if (typeof(CompiledDataContext).IsAssignableFrom(constExpr.Type) &&
this.TryRewriteMemberExpressionNode(node, out newNode))
{
return newNode;
}
}
return base.VisitMember(node);
}
protected override Expression VisitConstant(ConstantExpression node)
{
if (node.Value != null && node.Value.GetType() == typeof(InlinedLocationReference))
{
Expression newNode = node;
ILocationReferenceWrapper inlinedReference = (ILocationReferenceWrapper)node.Value;
if (inlinedReference != null)
{
newNode = Expression.Constant(inlinedReference.LocationReference, typeof(LocationReference));
return newNode;
}
}
return base.VisitConstant(node);
}
bool TryRewriteMemberExpressionNode(MemberExpression node, out Expression newNode)
{
newNode = null;
if (this.locationReferences != null)
{
foreach (LocationReference locationReference in this.locationReferences)
{
if (node.Member.Name == locationReference.Name)
{
if (locationReference is ILocationReferenceWrapper)
{
newNode = ExpressionUtilities.CreateIdentifierExpression(((ILocationReferenceWrapper)locationReference).LocationReference);
}
else
{
newNode = ExpressionUtilities.CreateIdentifierExpression(locationReference);
}
return true;
}
}
}
return false;
}
}
}
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