ModelScope.cs

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using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
 
namespace System.Xml.Serialization;
 
internal sealed class ModelScope
{
    private readonly TypeScope _typeScope;
 
    private readonly Dictionary<Type, TypeModel> _models = new Dictionary<Type, TypeModel>();
 
    private readonly Dictionary<Type, TypeModel> _arrayModels = new Dictionary<Type, TypeModel>();
 
    internal TypeScope TypeScope => _typeScope;
 
    internal ModelScope(TypeScope typeScope)
    {
        _typeScope = typeScope;
    }
 
    [RequiresUnreferencedCode("calls GetTypeModel")]
    internal TypeModel GetTypeModel(Type type)
    {
        return GetTypeModel(type, directReference: true);
    }
 
    [RequiresUnreferencedCode("calls GetTypeDesc")]
    internal TypeModel GetTypeModel(Type type, bool directReference)
    {
        if (_models.TryGetValue(type, out var value))
        {
            return value;
        }
        TypeDesc typeDesc = _typeScope.GetTypeDesc(type, null, directReference);
        switch (typeDesc.Kind)
        {
        case TypeKind.Enum:
            value = new EnumModel(type, typeDesc, this);
            break;
        case TypeKind.Primitive:
            value = new PrimitiveModel(type, typeDesc, this);
            break;
        case TypeKind.Array:
        case TypeKind.Collection:
        case TypeKind.Enumerable:
            value = new ArrayModel(type, typeDesc, this);
            break;
        case TypeKind.Root:
        case TypeKind.Struct:
        case TypeKind.Class:
            value = new StructModel(type, typeDesc, this);
            break;
        default:
            if (!typeDesc.IsSpecial)
            {
                throw new NotSupportedException(System.SR.Format(System.SR.XmlUnsupportedTypeKind, type.FullName));
            }
            value = new SpecialModel(type, typeDesc, this);
            break;
        }
        _models.Add(type, value);
        return value;
    }
 
    [RequiresUnreferencedCode("calls GetArrayTypeDesc")]
    internal ArrayModel GetArrayModel(Type type)
    {
        if (!_arrayModels.TryGetValue(type, out var value))
        {
            value = GetTypeModel(type);
            if (!(value is ArrayModel))
            {
                TypeDesc arrayTypeDesc = _typeScope.GetArrayTypeDesc(type);
                value = new ArrayModel(type, arrayTypeDesc, this);
            }
            _arrayModels.Add(type, value);
        }
        return (ArrayModel)value;
    }
}