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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Collections.Generic;
using System.ComponentModel;
using System.Reflection;
using System.Security;
using System.Windows.Markup;
namespace System.Xaml.Schema
{
internal class MemberReflector : Reflector
{
// VisibilityInvalid indicates the value hasn't been looked up yet
private const DesignerSerializationVisibility VisibilityInvalid = (DesignerSerializationVisibility)int.MaxValue;
// VisibilityNone indicates the value was looked up, and wasn't present
private const DesignerSerializationVisibility VisibilityNone = (DesignerSerializationVisibility)(int.MaxValue - 1);
private static MemberReflector s_UnknownReflector;
// Lazy init: check NullableReference.IsSet to determine if these fields have been initialized
private NullableReference<string> _constructorArgument;
private NullableReference<XamlValueConverter<XamlDeferringLoader>> _deferringLoader;
private NullableReference<object> _defaultValue;
private NullableReference<MethodInfo> _getter;
private NullableReference<MethodInfo> _setter;
private NullableReference<XamlValueConverter<TypeConverter>> _typeConverter;
private NullableReference<XamlValueConverter<ValueSerializer>> _valueSerializer;
// Lazy init: set to VisibilityInvalid when uninitialized
private DesignerSerializationVisibility _designerSerializationVisibility;
// Thread safety: see notes regarding bitflags in TypeReflector.cs
private int _memberBits;
internal MemberReflector()
{
_designerSerializationVisibility = VisibilityInvalid;
}
internal MemberReflector(bool isEvent)
:this()
{
if (isEvent)
{
_memberBits = (int)BoolMemberBits.Event;
}
_memberBits |= GetValidMask((int)BoolMemberBits.Event);
}
internal MemberReflector(MethodInfo getter, MethodInfo setter, bool isEvent)
: this(isEvent)
{
_getter.Value = getter;
_setter.Value = setter;
}
///<summary>Ctor used by directives</summary>
internal MemberReflector(XamlType type, XamlValueConverter<TypeConverter> typeConverter)
{
Type = type;
_typeConverter.Value = typeConverter;
_designerSerializationVisibility = DesignerSerializationVisibility.Visible;
_memberBits = (int)BoolMemberBits.Directive | (int)BoolMemberBits.AllValid;
// Explicitly set all the nullable references so that IsSet is true
_deferringLoader.Value = null;
_getter.Value = null;
_setter.Value = null;
_valueSerializer.Value = null;
}
internal static MemberReflector UnknownReflector
{
get
{
if (s_UnknownReflector == null)
{
s_UnknownReflector = new MemberReflector();
s_UnknownReflector._designerSerializationVisibility = DesignerSerializationVisibility.Visible;
s_UnknownReflector._memberBits = (int)BoolMemberBits.Default |
(int)BoolMemberBits.Unknown | (int)BoolMemberBits.AllValid;
// Explicitly set all the nullable references so that IsSet is true
s_UnknownReflector._deferringLoader.Value = null;
s_UnknownReflector._getter.Value = null;
s_UnknownReflector._setter.Value = null;
s_UnknownReflector._typeConverter.Value = null;
s_UnknownReflector._valueSerializer.Value = null;
s_UnknownReflector.DependsOn = XamlType.EmptyList<XamlMember>.Value;
s_UnknownReflector.Invoker = XamlMemberInvoker.UnknownInvoker;
s_UnknownReflector.Type = XamlLanguage.Object;
}
return s_UnknownReflector;
}
}
// Lazy init and thread safety note: all implicit properties (i.e properties without backing
// fields) are idempotent, and null if uninitialized
internal string ConstructorArgument
{
get { return _constructorArgument.Value; }
set { _constructorArgument.Value = value; }
}
internal bool ConstructorArgumentIsSet
{
get { return _constructorArgument.IsSet; }
}
internal IReadOnlyDictionary<char,char> MarkupExtensionBracketCharactersArgument { get; set; }
internal bool MarkupExtensionBracketCharactersArgumentIsSet { get; set; }
internal object DefaultValue
{
get { return _defaultValue.IsNotPresent ? null : _defaultValue.Value; }
set { _defaultValue.Value = value; }
}
internal bool DefaultValueIsNotPresent
{
get { return _defaultValue.IsNotPresent; }
set { _defaultValue.IsNotPresent = value; }
}
internal bool DefaultValueIsSet
{
get { return _defaultValue.IsSet; }
}
internal XamlValueConverter<XamlDeferringLoader> DeferringLoader
{
get { return _deferringLoader.Value; }
set { _deferringLoader.Value = value; }
}
internal bool DeferringLoaderIsSet { get { return _deferringLoader.IsSet; } }
internal IList<XamlMember> DependsOn { get; set; }
internal DesignerSerializationVisibility? SerializationVisibility
{
get { return (_designerSerializationVisibility != VisibilityNone) ? _designerSerializationVisibility : (DesignerSerializationVisibility?)null; }
set { _designerSerializationVisibility = value.GetValueOrDefault(VisibilityNone); }
}
internal bool DesignerSerializationVisibilityIsSet
{
get { return _designerSerializationVisibility != VisibilityInvalid; }
}
internal MethodInfo Getter
{
get { return _getter.Value; }
set { _getter.SetIfNull(value); }
}
internal bool GetterIsSet
{
get { return _getter.IsSet; }
}
internal XamlMemberInvoker Invoker { get; set; }
// No need to check valid flag, this is set at creation
internal bool IsUnknown { get { return (_memberBits & (int)BoolMemberBits.Unknown) != 0; } }
internal MethodInfo Setter
{
get { return _setter.Value; }
set { _setter.SetIfNull(value); }
}
internal bool SetterIsSet
{
get { return _setter.IsSet; }
}
internal XamlType Type { get; set; }
internal XamlType TargetType { get; set; }
internal XamlValueConverter<TypeConverter> TypeConverter
{
get { return _typeConverter.Value; }
set { _typeConverter.Value = value; }
}
internal bool TypeConverterIsSet { get { return _typeConverter.IsSet; } }
internal MemberInfo UnderlyingMember { get; set; }
internal XamlValueConverter<ValueSerializer> ValueSerializer
{
get { return _valueSerializer.Value; }
set { _valueSerializer.Value = value; }
}
internal bool ValueSerializerIsSet { get { return _valueSerializer.IsSet; } }
internal bool? GetFlag(BoolMemberBits flag)
{
return GetFlag(_memberBits, (int)flag);
}
internal void SetFlag(BoolMemberBits flag, bool value)
{
SetFlag(ref _memberBits, (int)flag, value);
}
// Assumes declaring type is visible and is either public or internal
// Assumes method type args (if any) are visible
internal static bool IsInternalVisibleTo(MethodInfo method, Assembly accessingAssembly, XamlSchemaContext schemaContext)
{
if (accessingAssembly == null)
{
return false;
}
if (method.IsAssembly || method.IsFamilyOrAssembly)
{
if (TypeReflector.IsInternal(method.DeclaringType))
{
// We've already done an internals visibility check for the declaring type
return true;
}
return schemaContext.AreInternalsVisibleTo(
method.DeclaringType.Assembly, accessingAssembly);
}
return false;
}
// Assumes declaring type is visible and is either public or internal
// Assumes method type args (if any) are visible
internal static bool IsProtectedVisibleTo(MethodInfo method, Type derivedType, XamlSchemaContext schemaContext)
{
if (derivedType == null)
{
return false;
}
// Note: this doesn't handle the case of method.IsAssembly, because callers should use
// IsInternalVisibleTo for those cases.
if (!derivedType.Equals(method.DeclaringType) && !derivedType.IsSubclassOf(method.DeclaringType))
{
return false;
}
if (method.IsFamily || method.IsFamilyOrAssembly)
{
return true;
}
if (method.IsFamilyAndAssembly)
{
if (TypeReflector.IsInternal(method.DeclaringType))
{
// We've already done an internals visibility check for the declaring type
return true;
}
return schemaContext.AreInternalsVisibleTo(
method.DeclaringType.Assembly, derivedType.Assembly);
}
return false;
}
internal static bool GenericArgumentsAreVisibleTo(MethodInfo method, Assembly accessingAssembly, XamlSchemaContext schemaContext)
{
if (method.IsGenericMethod)
{
foreach (Type typeArg in method.GetGenericArguments())
{
if (!TypeReflector.IsVisibleTo(typeArg, accessingAssembly, schemaContext))
{
return false;
}
}
}
return true;
}
// Used by Reflector for attribute lookups
protected override MemberInfo Member
{
get { return UnderlyingMember; }
}
}
}
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