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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;
// BinaryExpression fingerprint class
// Useful for things like array[index]
//
// This particular fingerprint doesn't support the BinaryExpression.Conversion property,
// which is used in some coalescing operations.
[SuppressMessage("Microsoft.Usage", "CA2218:OverrideGetHashCodeOnOverridingEquals",
Justification = "Overrides AddToHashCodeCombiner() instead.")]
internal sealed class BinaryExpressionFingerprint : ExpressionFingerprint {
private BinaryExpressionFingerprint(BinaryExpression expression)
: base(expression) {
// don't care about UnaryExpression.IsLifted since it's not necessary to uniquely describe the expression,
// but IsLiftedToNull *is* required
IsLiftedToNull = expression.IsLiftedToNull;
Method = expression.Method;
}
public bool IsLiftedToNull {
get;
private set;
}
public ExpressionFingerprint Left {
get;
private set;
}
public MethodInfo Method {
get;
private set;
}
public ExpressionFingerprint Right {
get;
private set;
}
internal override void AddToHashCodeCombiner(HashCodeCombiner combiner) {
base.AddToHashCodeCombiner(combiner);
combiner.AddInt32(IsLiftedToNull.GetHashCode());
combiner.AddFingerprint(Left);
combiner.AddObject(Method);
combiner.AddFingerprint(Right);
}
public static BinaryExpressionFingerprint Create(BinaryExpression expression, ParserContext parserContext) {
if (expression.Conversion != null) {
// we don't support the Conversion property
return null;
}
// if any fingerprinting fails, bail out
ExpressionFingerprint left = Create(expression.Left, parserContext);
if (left == null && expression.Left != null) {
return null;
}
ExpressionFingerprint right = Create(expression.Right, parserContext);
if (right == null && expression.Right != null) {
return null;
}
return new BinaryExpressionFingerprint(expression) {
Left = left,
Right = right
};
}
public override bool Equals(object obj) {
BinaryExpressionFingerprint other = obj as BinaryExpressionFingerprint;
if (other == null) {
return false;
}
return (this.IsLiftedToNull == other.IsLiftedToNull
&& Object.Equals(this.Left, other.Left)
&& this.Method == other.Method
&& Object.Equals(this.Right, other.Right)
&& base.Equals(other));
}
public override Expression ToExpression(ParserContext parserContext) {
Expression leftExpr = ToExpression(Left, parserContext);
Expression rightExpr = ToExpression(Right, parserContext);
return Expression.MakeBinary(NodeType, leftExpr, rightExpr, IsLiftedToNull, Method);
}
}
}
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