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MethodSignatureComparer.cs
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MethodSignatureComparer.cs
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// Copyright 2004-2021 Castle Project - http://www.castleproject.org/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
namespace Castle.DynamicProxy.Generators
{
using System;
using System.Collections.Generic;
using System.Reflection;
internal class MethodSignatureComparer : IEqualityComparer<MethodInfo>
{
public static readonly MethodSignatureComparer Instance = new MethodSignatureComparer();
public bool EqualGenericParameters(MethodInfo x, MethodInfo y)
{
if (x.IsGenericMethod != y.IsGenericMethod)
{
return false;
}
if (x.IsGenericMethod)
{
var xArgs = x.GetGenericArguments();
var yArgs = y.GetGenericArguments();
if (xArgs.Length != yArgs.Length)
{
return false;
}
for (var i = 0; i < xArgs.Length; ++i)
{
if (xArgs[i].IsGenericParameter != yArgs[i].IsGenericParameter)
{
return false;
}
if (!xArgs[i].IsGenericParameter && !xArgs[i].Equals(yArgs[i]))
{
return false;
}
}
}
return true;
}
public bool EqualParameters(MethodInfo x, MethodInfo y)
{
var xArgs = x.GetParameters();
var yArgs = y.GetParameters();
if (xArgs.Length != yArgs.Length)
{
return false;
}
for (var i = 0; i < xArgs.Length; ++i)
{
if (!EqualSignatureTypes(xArgs[i].ParameterType, yArgs[i].ParameterType))
{
return false;
}
}
return true;
}
public bool EqualSignatureTypes(Type x, Type y)
{
if (x.IsGenericParameter != y.IsGenericParameter)
{
return false;
}
else if (x.IsGenericType != y.IsGenericType)
{
return false;
}
if (x.IsGenericParameter)
{
if (x.GenericParameterPosition != y.GenericParameterPosition)
{
return false;
}
}
else if (x.IsGenericType)
{
var xGenericTypeDef = x.GetGenericTypeDefinition();
var yGenericTypeDef = y.GetGenericTypeDefinition();
if (xGenericTypeDef != yGenericTypeDef)
{
return false;
}
var xArgs = x.GetGenericArguments();
var yArgs = y.GetGenericArguments();
if (xArgs.Length != yArgs.Length)
{
return false;
}
for (var i = 0; i < xArgs.Length; ++i)
{
if(!EqualSignatureTypes(xArgs[i], yArgs[i])) return false;
}
}
else
{
if (!x.Equals(y))
{
return false;
}
}
return true;
}
public bool Equals(MethodInfo x, MethodInfo y)
{
if (x == null && y == null)
{
return true;
}
if (x == null || y == null)
{
return false;
}
return EqualNames(x, y) &&
EqualGenericParameters(x, y) &&
EqualSignatureTypes(x.ReturnType, y.ReturnType) &&
EqualParameters(x, y);
}
public int GetHashCode(MethodInfo obj)
{
return obj.Name.GetHashCode() ^ obj.GetParameters().Length; // everything else would be too cumbersome
}
private bool EqualNames(MethodInfo x, MethodInfo y)
{
return x.Name == y.Name;
}
}
}