//Copyright 2010 Microsoft Corporation
//
//Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
//You may obtain a copy of the License at
//
//http://www.apache.org/licenses/LICENSE-2.0
//
//Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
//"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and limitations under the License.
namespace System.Data.Services.Client{
using System.Diagnostics;
using System.Linq.Expressions;
internal class ParameterReplacerVisitor : ExpressionVisitor
{
private Expression newExpression;
private ParameterExpression oldParameter;
private ParameterReplacerVisitor(ParameterExpression oldParameter, Expression newExpression)
{
this.oldParameter = oldParameter;
this.newExpression = newExpression;
}
internal static Expression Replace(Expression expression, ParameterExpression oldParameter, Expression newExpression)
{
Debug.Assert(expression != null, "expression != null");
Debug.Assert(oldParameter != null, "oldParameter != null");
Debug.Assert(newExpression != null, "newExpression != null");
return new ParameterReplacerVisitor(oldParameter, newExpression).Visit(expression);
}
internal override Expression VisitParameter(ParameterExpression p)
{
if (p == this.oldParameter)
{
return this.newExpression;
}
else
{
return p;
}
}
}
}
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