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Explicitly compare MaybeType objects by name by filmor · Pull Request #2270 · pythonnet/pythonnet · GitHub

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Explicitly compare MaybeType objects by name #2270

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Explicitly compare MaybeType objects by name #2270

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5 changes: 3 additions & 2 deletions src/runtime/ClassManager.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,6 @@
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Security;

using Python.Runtime.StateSerialization;
Expand Down Expand Up @@ -33,7 +32,9 @@ internal class ClassManager
BindingFlags.Public |
BindingFlags.NonPublic;

internal static Dictionary<MaybeType, ReflectedClrType> cache = new(capacity: 128);
internal static Dictionary<MaybeType, ReflectedClrType> cache = new(
capacity: 128, comparer: new MaybeTypeComparer()
);
private static readonly Type dtype;

private ClassManager()
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91 changes: 50 additions & 41 deletions src/runtime/StateSerialization/MaybeType.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,62 +3,71 @@
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;
using System.Collections.Generic;

namespace Python.Runtime
namespace Python.Runtime;

[Serializable]
internal struct MaybeType : ISerializable
{
[Serializable]
internal struct MaybeType : ISerializable
{
public static implicit operator MaybeType (Type ob) => new(ob);
public static implicit operator MaybeType (Type ob) => new(ob);

// The AssemblyQualifiedName of the serialized Type
const string SerializationName = "n";
readonly string name;
readonly Type type;
// The AssemblyQualifiedName of the serialized Type
const string SerializationName = "n";
readonly string name;
readonly Type type;

public string DeletedMessage
public string DeletedMessage
{
get
{
get
{
return $"The .NET Type {name} no longer exists";
}
return $"The .NET Type {name} no longer exists";
}
}

public Type Value
public Type Value
{
get
{
get
if (type == null)
{
if (type == null)
{
throw new SerializationException(DeletedMessage);
}
return type;
throw new SerializationException(DeletedMessage);
}
return type;
}
}

public string Name => name;
public bool Valid => type != null;
public string Name => name;
public bool Valid => type != null;

public override string ToString()
{
return (type != null ? type.ToString() : $"missing type: {name}");
}
public override string ToString()
{
return (type != null ? type.ToString() : $"missing type: {name}");
}

public MaybeType(Type tp)
{
type = tp;
name = tp.AssemblyQualifiedName;
}
public MaybeType(Type tp)
{
type = tp;
name = tp.AssemblyQualifiedName;
}

private MaybeType(SerializationInfo serializationInfo, StreamingContext context)
{
name = (string)serializationInfo.GetValue(SerializationName, typeof(string));
type = Type.GetType(name, throwOnError:false);
}
private MaybeType(SerializationInfo serializationInfo, StreamingContext context)
{
name = (string)serializationInfo.GetValue(SerializationName, typeof(string));
type = Type.GetType(name, throwOnError:false);
}

public void GetObjectData(SerializationInfo serializationInfo, StreamingContext context)
{
serializationInfo.AddValue(SerializationName, name);
}
public void GetObjectData(SerializationInfo serializationInfo, StreamingContext context)
{
serializationInfo.AddValue(SerializationName, name);
}
}

[Serializable]
internal class MaybeTypeComparer : IEqualityComparer<MaybeType>
{
public bool Equals (MaybeType lhs, MaybeType rhs) =>
lhs.Name == rhs.Name;

public int GetHashCode(MaybeType t) => (t.Name ?? "").GetHashCode();
}
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