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