/// <summary>
/// Checks if a given method implements IEqualityComparer.Equals or IEquatable.Equals.
/// </summary>
private static bool IsEqualsInterfaceImplementation(IMethodSymbol method, Compilation compilation)
{
if (method.Name != WellKnownMemberNames.ObjectEquals)
{
return(false);
}
int paramCount = method.Parameters.Length;
if (method.ReturnType.SpecialType == SpecialType.System_Boolean &&
(paramCount == 1 || paramCount == 2))
{
// Substitute the type of the first parameter of Equals in the generic interface and then check if that
// interface method is implemented by the given method.
INamedTypeSymbol?iEqualityComparer = compilation.GetOrCreateTypeByMetadataName(WellKnownTypeNames.SystemCollectionsGenericIEqualityComparer1);
if (method.IsImplementationOfInterfaceMethod(method.Parameters.First().Type, iEqualityComparer, WellKnownMemberNames.ObjectEquals))
{
return(true);
}
// Substitute the type of the first parameter of Equals in the generic interface and then check if that
// interface method is implemented by the given method.
INamedTypeSymbol?iEquatable = compilation.GetOrCreateTypeByMetadataName(WellKnownTypeNames.SystemIEquatable1);
if (method.IsImplementationOfInterfaceMethod(method.Parameters.First().Type, iEquatable, WellKnownMemberNames.ObjectEquals))
{
return(true);
}
}
return(false);
}
/// <summary>
/// Checks if a given method implements IEqualityComparer.GetHashCode or IHashCodeProvider.GetHashCode.
/// </summary>
/// <param name="method"></param>
/// <param name="compilation"></param>
/// <returns></returns>
private static bool IsGetHashCodeInterfaceImplementation(IMethodSymbol method, Compilation compilation)
{
if (method.Name != WellKnownMemberNames.ObjectGetHashCode)
{
return(false);
}
if (method.ReturnType.SpecialType == SpecialType.System_Int32 && method.Parameters.Length == 1)
{
// Substitute the type of the first parameter of Equals in the generic interface and then check if that
// interface method is implemented by the given method.
INamedTypeSymbol?iEqualityComparer = compilation.GetOrCreateTypeByMetadataName(WellKnownTypeNames.SystemCollectionsGenericIEqualityComparer1);
if (method.IsImplementationOfInterfaceMethod(method.Parameters.First().Type, iEqualityComparer, WellKnownMemberNames.ObjectGetHashCode))
{
return(true);
}
INamedTypeSymbol?iHashCodeProvider = compilation.GetOrCreateTypeByMetadataName(WellKnownTypeNames.SystemCollectionsIHashCodeProvider);
if (method.IsImplementationOfInterfaceMethod(null, iHashCodeProvider, WellKnownMemberNames.ObjectGetHashCode))
{
return(true);
}
}
return(false);
}
/// <summary>
/// Checks if the given method implements IDisposable.Dispose()
/// </summary>
public static bool IsDisposeImplementation(this IMethodSymbol method, INamedTypeSymbol iDisposable)
{
if (method.ReturnType.SpecialType == SpecialType.System_Void && method.Parameters.Length == 0)
{
// Identify the implementor of IDisposable.Dispose in the given method's containing type and check
// if it is the given method.
if (method.IsImplementationOfInterfaceMethod(null, iDisposable, "Dispose"))
{
return(true);
}
}
return(false);
}
/// <summary>
/// Checks if the given method implements <see cref="IDisposable.Dispose"/> or overrides an implementation of <see cref="IDisposable.Dispose"/>.
/// </summary>
public static bool IsDisposeImplementation(this IMethodSymbol method, INamedTypeSymbol iDisposable)
{
if (method == null)
{
return(false);
}
if (method.IsOverride)
{
return(method.OverriddenMethod.IsDisposeImplementation(iDisposable));
}
// Identify the implementor of IDisposable.Dispose in the given method's containing type and check
// if it is the given method.
return(method.ReturnsVoid &&
method.Parameters.Length == 0 &&
method.IsImplementationOfInterfaceMethod(null, iDisposable, "Dispose"));
}
/// <summary>
/// Checks if the given method implements 'System.Runtime.Serialization.IDeserializationCallback.OnDeserialization' or overrides an implementation of 'System.Runtime.Serialization.IDeserializationCallback.OnDeserialization'/>.
/// </summary>
public static bool IsOnDeserializationImplementation(this IMethodSymbol method, INamedTypeSymbol iDeserializationCallback)
{
if (method == null)
{
return(false);
}
if (method.IsOverride)
{
return(method.OverriddenMethod.IsOnDeserializationImplementation(iDeserializationCallback));
}
// Identify the implementor of IDisposable.Dispose in the given method's containing type and check
// if it is the given method.
return(method.ReturnsVoid &&
method.Parameters.Length == 1 &&
method.Parameters[0].Type.SpecialType == SpecialType.System_Object &&
method.IsImplementationOfInterfaceMethod(null, iDeserializationCallback, "OnDeserialization"));
}
/// <summary>
/// Checks if a given method implements IEqualityComparer.GetHashCode or IHashCodeProvider.GetHashCode.
/// </summary>
/// <param name="method"></param>
/// <param name="compilation"></param>
/// <returns></returns>
private static bool IsGetHashCodeInterfaceImplementation(IMethodSymbol method, Compilation compilation)
{
if (method.Name != WellKnownMemberNames.ObjectGetHashCode)
{
return false;
}
if (method.ReturnType.SpecialType == SpecialType.System_Int32 && method.Parameters.Length == 1)
{
// Substitute the type of the first parameter of Equals in the generic interface and then check if that
// interface method is implemented by the given method.
INamedTypeSymbol iEqualityComparer = WellKnownTypes.GenericIEqualityComparer(compilation);
if (method.IsImplementationOfInterfaceMethod(method.Parameters.First().Type, iEqualityComparer, WellKnownMemberNames.ObjectGetHashCode))
{
return true;
}
INamedTypeSymbol iHashCodeProvider = WellKnownTypes.IHashCodeProvider(compilation);
if (method.IsImplementationOfInterfaceMethod(null, iHashCodeProvider, WellKnownMemberNames.ObjectGetHashCode))
{
return true;
}
}
return false;
}
/// <summary>
/// Checks if a given method implements IEqualityComparer.Equals or IEquatable.Equals.
/// </summary>
private static bool IsEqualsInterfaceImplementation(IMethodSymbol method, Compilation compilation)
{
if (method.Name != WellKnownMemberNames.ObjectEquals)
{
return false;
}
int paramCount = method.Parameters.Length;
if (method.ReturnType.SpecialType == SpecialType.System_Boolean &&
(paramCount == 1 || paramCount == 2))
{
// Substitute the type of the first parameter of Equals in the generic interface and then check if that
// interface method is implemented by the given method.
INamedTypeSymbol iEqualityComparer = WellKnownTypes.GenericIEqualityComparer(compilation);
if (method.IsImplementationOfInterfaceMethod(method.Parameters.First().Type, iEqualityComparer, WellKnownMemberNames.ObjectEquals))
{
return true;
}
// Substitute the type of the first parameter of Equals in the generic interface and then check if that
// interface method is implemented by the given method.
INamedTypeSymbol iEquatable = WellKnownTypes.GenericIEquatable(compilation);
if (method.IsImplementationOfInterfaceMethod(method.Parameters.First().Type, iEquatable, WellKnownMemberNames.ObjectEquals))
{
return true;
}
}
return false;
}
