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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation. All rights reserved.
*
* This software is subject to the Microsoft Public License (Ms-PL).
* A copy of the license can be found in the license.htm file included
* in this distribution.
*
* You must not remove this notice, or any other, from this software.
*
* ***************************************************************************/
namespace System.Web.Mvc.ExpressionUtil {
using System;
using System.Linq.Expressions;
// ParameterExpression fingerprint class
// Specifically, instances of this type represent the model parameter
internal sealed class ParameterExpressionFingerprint : ExpressionFingerprint {
private ParameterExpressionFingerprint(ParameterExpression expression)
: base(expression) {
}
public static ParameterExpressionFingerprint Create(ParameterExpression expression, ParserContext parserContext) {
if (expression == parserContext.ModelParameter) {
return new ParameterExpressionFingerprint(expression);
}
else {
// degenerate case - uncaptured parameter expression passed into the system
return null;
}
}
public override Expression ToExpression(ParserContext parserContext) {
// The only time an instance of this class exists is if it represents the actual model parameter,
// so just return it directly.
return parserContext.ModelParameter;
}
}
}
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