84 lines
3.0 KiB
C#
84 lines
3.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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namespace Umbraco.Core
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{
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/// <summary>
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/// Represents a simple <see cref="LambdaExpression"/> in a form which is suitable for using as a dictionary key
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/// by exposing the return type, argument types and expression string form in a single concatenated string.
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/// </summary>
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public struct LambdaExpressionCacheKey
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{
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public LambdaExpressionCacheKey(string returnType, string expression, params string[] argTypes)
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{
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ReturnType = returnType;
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ExpressionAsString = expression;
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ArgTypes = new HashSet<string>(argTypes);
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_toString = null;
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}
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public LambdaExpressionCacheKey(LambdaExpression obj)
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{
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ReturnType = obj.ReturnType.FullName;
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ExpressionAsString = obj.ToString();
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ArgTypes = new HashSet<string>(obj.Parameters.Select(x => x.Type.FullName));
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_toString = null;
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}
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/// <summary>
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/// The argument type names of the <see cref="LambdaExpression"/>
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/// </summary>
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public readonly HashSet<string> ArgTypes;
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/// <summary>
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/// The return type of the <see cref="LambdaExpression"/>
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/// </summary>
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public readonly string ReturnType;
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/// <summary>
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/// The original string representation of the <see cref="LambdaExpression"/>
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/// </summary>
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public readonly string ExpressionAsString;
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private string _toString;
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/// <summary>
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/// Returns a <see cref="System.String"/> that represents this instance.
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/// </summary>
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/// <returns>
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/// A <see cref="System.String"/> that represents this instance.
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/// </returns>
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public override string ToString()
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{
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return _toString ?? (_toString = String.Concat(String.Join("|", ArgTypes), ",", ReturnType, ",", ExpressionAsString));
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}
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/// <summary>
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/// Determines whether the specified <see cref="System.Object"/> is equal to this instance.
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/// </summary>
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/// <param name="obj">The <see cref="System.Object"/> to compare with this instance.</param>
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/// <returns>
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/// <c>true</c> if the specified <see cref="System.Object"/> is equal to this instance; otherwise, <c>false</c>.
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/// </returns>
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public override bool Equals(object obj)
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{
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if (ReferenceEquals(obj, null)) return false;
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var casted = (LambdaExpressionCacheKey)obj;
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return casted.ToString() == ToString();
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}
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/// <summary>
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/// Returns a hash code for this instance.
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/// </summary>
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/// <returns>
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/// A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table.
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/// </returns>
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public override int GetHashCode()
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{
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return ToString().GetHashCode();
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}
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}
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}
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