AttributeUtil
using Castle.DynamicProxy.Generators;
using System;
using System.Collections.Generic;
using System.Reflection;
using System.Reflection.Emit;
namespace Castle.DynamicProxy.Internal
{
public static class AttributeUtil
{
private static readonly IDictionary<Type, IAttributeDisassembler> disassemblers = new Dictionary<Type, IAttributeDisassembler>();
private static IAttributeDisassembler fallbackDisassembler = new AttributeDisassembler();
public static IAttributeDisassembler FallbackDisassembler {
get {
return fallbackDisassembler;
}
set {
fallbackDisassembler = value;
}
}
public static void AddDisassembler<TAttribute>(IAttributeDisassembler disassembler) where TAttribute : Attribute
{
if (disassembler == null)
throw new ArgumentNullException("disassembler");
disassemblers[typeof(TAttribute)] = disassembler;
}
public static CustomAttributeBuilder CreateBuilder(CustomAttributeData attribute)
{
GetSettersAndFields(attribute.NamedArguments, out PropertyInfo[] properties, out object[] propertyValues, out FieldInfo[] fields, out object[] fieldValues);
object[] arguments = GetArguments(attribute.ConstructorArguments);
return new CustomAttributeBuilder(attribute.Constructor, arguments, properties, propertyValues, fields, fieldValues);
}
private static object[] GetArguments(IList<CustomAttributeTypedArgument> constructorArguments)
{
object[] array = new object[constructorArguments.Count];
for (int i = 0; i < constructorArguments.Count; i++) {
array[i] = ReadAttributeValue(constructorArguments[i]);
}
return array;
}
private static object ReadAttributeValue(CustomAttributeTypedArgument argument)
{
object value = argument.Value;
if (!argument.ArgumentType.IsArray)
return value;
object[] arguments = GetArguments((IList<CustomAttributeTypedArgument>)value);
Array array = Array.CreateInstance(argument.ArgumentType.GetElementType() ?? typeof(object), arguments.Length);
arguments.CopyTo(array, 0);
return array;
}
private static void GetSettersAndFields(IEnumerable<CustomAttributeNamedArgument> namedArguments, out PropertyInfo[] properties, out object[] propertyValues, out FieldInfo[] fields, out object[] fieldValues)
{
List<PropertyInfo> list = new List<PropertyInfo>();
List<object> list2 = new List<object>();
List<FieldInfo> list3 = new List<FieldInfo>();
List<object> list4 = new List<object>();
foreach (CustomAttributeNamedArgument namedArgument in namedArguments) {
switch (namedArgument.MemberInfo.MemberType) {
case MemberTypes.Property:
list.Add(namedArgument.MemberInfo as PropertyInfo);
list2.Add(ReadAttributeValue(namedArgument.TypedValue));
break;
case MemberTypes.Field:
list3.Add(namedArgument.MemberInfo as FieldInfo);
list4.Add(ReadAttributeValue(namedArgument.TypedValue));
break;
default:
throw new ArgumentException($"""{namedArgument.MemberInfo.MemberType}""");
}
}
properties = list.ToArray();
propertyValues = list2.ToArray();
fields = list3.ToArray();
fieldValues = list4.ToArray();
}
public static IEnumerable<CustomAttributeBuilder> GetNonInheritableAttributes(this MemberInfo member)
{
IList<CustomAttributeData> attributes = CustomAttributeData.GetCustomAttributes(member);
foreach (CustomAttributeData item in attributes) {
Type attributeType = item.Constructor.DeclaringType;
if (!ShouldSkipAttributeReplication(attributeType)) {
CustomAttributeBuilder builder;
try {
builder = CreateBuilder(item);
} catch (ArgumentException innerException) {
string message = string.Format("Due to limitations in CLR, DynamicProxy was unable to successfully replicate non-inheritable attribute {0} on {1}{2}. To avoid this error you can chose not to replicate this attribute type by calling '{3}.Add(typeof({0}))'.", attributeType.FullName, ((object)member.ReflectedType == null) ? "" : member.ReflectedType.FullName, (member is Type) ? "" : ("." + member.Name), typeof(AttributesToAvoidReplicating).FullName);
throw new ProxyGenerationException(message, innerException);
}
if (builder != null)
yield return builder;
}
}
}
public static IEnumerable<CustomAttributeBuilder> GetNonInheritableAttributes(this ParameterInfo parameter)
{
IList<CustomAttributeData> attributes = CustomAttributeData.GetCustomAttributes(parameter);
foreach (CustomAttributeData item in attributes) {
Type attributeType = item.Constructor.DeclaringType;
if (!ShouldSkipAttributeReplication(attributeType)) {
CustomAttributeBuilder builder = CreateBuilder(item);
if (builder != null)
yield return builder;
}
}
}
private static bool ShouldSkipAttributeReplication(Type attribute)
{
if (!attribute.IsPublic)
return true;
if (SpecialCaseAttributThatShouldNotBeReplicated(attribute))
return true;
object[] customAttributes = attribute.GetCustomAttributes(typeof(AttributeUsageAttribute), true);
if (customAttributes.Length != 0) {
AttributeUsageAttribute attributeUsageAttribute = (AttributeUsageAttribute)customAttributes[0];
return attributeUsageAttribute.Inherited;
}
return true;
}
private static bool SpecialCaseAttributThatShouldNotBeReplicated(Type attribute)
{
return AttributesToAvoidReplicating.Contains(attribute);
}
public static CustomAttributeBuilder CreateBuilder<TAttribute>() where TAttribute : Attribute, new
{
ConstructorInfo constructor = typeof(TAttribute).GetConstructor(Type.EmptyTypes);
return new CustomAttributeBuilder(constructor, new object[0]);
}
public static CustomAttributeBuilder CreateBuilder(Type attribute, object[] constructorArguments)
{
ConstructorInfo constructor = attribute.GetConstructor(GetTypes(constructorArguments));
return new CustomAttributeBuilder(constructor, constructorArguments);
}
internal static CustomAttributeBuilder CreateBuilder(Attribute attribute)
{
Type type = attribute.GetType();
if (disassemblers.TryGetValue(type, out IAttributeDisassembler value))
return value.Disassemble(attribute);
return FallbackDisassembler.Disassemble(attribute);
}
private static Type[] GetTypes(object[] objects)
{
Type[] array = new Type[objects.Length];
for (int i = 0; i < array.Length; i++) {
array[i] = objects[i].GetType();
}
return array;
}
}
}