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#pragma warning disable 659 // overrides AddToHashCodeCombiner instead
/* ****************************************************************************
*
* 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.Diagnostics.CodeAnalysis;
using System.Linq.Expressions;
using System.Reflection;
// UnaryExpression fingerprint class
// The most common appearance of a UnaryExpression is a cast or other conversion operator
[SuppressMessage("Microsoft.Usage", "CA2218:OverrideGetHashCodeOnOverridingEquals",
Justification = "Overrides AddToHashCodeCombiner() instead.")]
internal sealed class UnaryExpressionFingerprint : ExpressionFingerprint {
private UnaryExpressionFingerprint(UnaryExpression expression)
: base(expression) {
// don't care about UnaryExpression.IsLifted / IsLiftedToNull since they're not necessary to uniquely describe the expression
Method = expression.Method;
}
public MethodInfo Method {
get;
private set;
}
public ExpressionFingerprint Operand {
get;
private set;
}
internal override void AddToHashCodeCombiner(HashCodeCombiner combiner) {
base.AddToHashCodeCombiner(combiner);
combiner.AddObject(Method);
combiner.AddFingerprint(Operand);
}
public static UnaryExpressionFingerprint Create(UnaryExpression expression, ParserContext parserContext) {
ExpressionFingerprint operand = Create(expression.Operand, parserContext);
if (operand == null && expression.Operand != null) {
// couldn't convert the operand, so bail
return null;
}
return new UnaryExpressionFingerprint(expression) {
Operand = operand
};
}
public override bool Equals(object obj) {
UnaryExpressionFingerprint other = obj as UnaryExpressionFingerprint;
if (other == null) {
return false;
}
return (this.Method == other.Method
&& Object.Equals(this.Operand, other.Operand)
&& base.Equals(other));
}
public override Expression ToExpression(ParserContext parserContext) {
Expression operandExpr = ToExpression(Operand, parserContext);
// in .NET 3.5 SP1, Expression.MakeUnary() throws if NodeType is UnaryPlus, so special-case
if (NodeType == ExpressionType.UnaryPlus) {
return Expression.UnaryPlus(operandExpr, Method);
}
else {
return Expression.MakeUnary(NodeType, operandExpr, Type, Method);
}
}
}
}
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