Siggingway/Siggingway/Wrappers.cs

using System.Reflection;

namespace Siggingway;

internal interface IFieldOrPropertyInfo {
    string Name { get; }

    Type ActualType { get; }

    bool IsNullable { get; }

    void SetValue(object? self, object? value);

    T? GetCustomAttribute<T>() where T : Attribute;
}

internal sealed class FieldInfoWrapper : IFieldOrPropertyInfo {
    private FieldInfo Info { get; }

    public FieldInfoWrapper(FieldInfo info) {
        this.Info = info;
    }

    public string Name => this.Info.Name;

    public Type ActualType => this.Info.FieldType;

    public bool IsNullable => NullabilityUtil.IsNullable(this.Info);

    public void SetValue(object? self, object? value) {
        this.Info.SetValue(self, value);
    }

    public T? GetCustomAttribute<T>() where T : Attribute {
        return this.Info.GetCustomAttribute<T>();
    }
}

internal sealed class PropertyInfoWrapper : IFieldOrPropertyInfo {
    private PropertyInfo Info { get; }

    public PropertyInfoWrapper(PropertyInfo info) {
        this.Info = info;
    }

    public string Name => this.Info.Name;

    public Type ActualType => this.Info.PropertyType;

    public bool IsNullable => NullabilityUtil.IsNullable(this.Info);

    public void SetValue(object? self, object? value) {
        this.Info.SetValue(self, value);
    }

    public T? GetCustomAttribute<T>() where T : Attribute {
        return this.Info.GetCustomAttribute<T>();
    }
}