44 lines
1.4 KiB
C#
44 lines
1.4 KiB
C#
namespace System.Web.Mvc.ExpressionUtil {
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using System;
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using System.Linq.Expressions;
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// Serves as the base class for all expression fingerprints. Provides a default implementation
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// of GetHashCode().
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internal abstract class ExpressionFingerprint {
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protected ExpressionFingerprint(ExpressionType nodeType, Type type) {
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NodeType = nodeType;
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Type = type;
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}
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// the type of expression node, e.g. OP_ADD, MEMBER_ACCESS, etc.
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public ExpressionType NodeType { get; private set; }
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// the CLR type resulting from this expression, e.g. int, string, etc.
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public Type Type { get; private set; }
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internal virtual void AddToHashCodeCombiner(HashCodeCombiner combiner) {
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combiner.AddInt32((int)NodeType);
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combiner.AddObject(Type);
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}
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protected bool Equals(ExpressionFingerprint other) {
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return (other != null)
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&& (this.NodeType == other.NodeType)
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&& Equals(this.Type, other.Type);
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}
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public override bool Equals(object obj) {
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return Equals(obj as ExpressionFingerprint);
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}
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public override int GetHashCode() {
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HashCodeCombiner combiner = new HashCodeCombiner();
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AddToHashCodeCombiner(combiner);
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return combiner.CombinedHash;
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}
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}
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}
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