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#pragma warning disable 659 // overrides AddToHashCodeCombiner instead
namespace System.Web.Mvc.ExpressionUtil {
using System;
using System.Diagnostics.CodeAnalysis;
using System.Linq.Expressions;
// ParameterExpression fingerprint class
// Can represent the model parameter or an inner parameter in an open lambda expression
[SuppressMessage("Microsoft.Usage", "CA2218:OverrideGetHashCodeOnOverridingEquals", Justification = "Overrides AddToHashCodeCombiner() instead.")]
internal sealed class ParameterExpressionFingerprint : ExpressionFingerprint {
public ParameterExpressionFingerprint(ExpressionType nodeType, Type type, int parameterIndex)
: base(nodeType, type) {
ParameterIndex = parameterIndex;
}
// Parameter position within the overall expression, used to maintain alpha equivalence.
public int ParameterIndex { get; private set; }
public override bool Equals(object obj) {
ParameterExpressionFingerprint other = obj as ParameterExpressionFingerprint;
return (other != null)
&& (this.ParameterIndex == other.ParameterIndex)
&& this.Equals(other);
}
internal override void AddToHashCodeCombiner(HashCodeCombiner combiner) {
combiner.AddInt32(ParameterIndex);
base.AddToHashCodeCombiner(combiner);
}
}
}
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