public static FieldInfo GetField(Type type, string name, BindingFlags flags)
{
while (type != null && type != typeof(object))
{
var typeInfo = GenericInstanceFactory.GetGenericTypeInfo(type);
var typeDef = typeInfo != null ? typeInfo.TypeDefinition : type;
// NOTE: doesn't throw AmbiguousMatchException
var fields = typeDef.JavaGetDeclaredFields();
for (int i = 0; i < fields.Length; ++i)
{
if (fields[i].Name != name)
{
continue;
}
if (!TypeHelper.Matches(fields[i].Modifiers, flags))
{
continue;
}
return(new FieldInfo(fields[i], type));
}
if ((flags & BindingFlags.DeclaredOnly) != 0)
{
break;
}
type = type.BaseType;
}
return(null);
}
/// <summary>
/// will return null if not a generic proxy type
/// </summary>
public static ConstructorInfo GetConstructor(Type type, Type[] parameters)
{
var typeInfo = GenericInstanceFactory.GetGenericTypeInfo(type);
if (typeInfo == null)
{
return(null);
}
Type[] trueParameters = typeInfo.AddGenericParameterTypes(parameters);
for (int i = 0; i < parameters.Length; ++i)
{
trueParameters[i] = EnsureTypeDef(parameters[i]);
}
try
{
var javaContructor = typeInfo.TypeDefinition.JavaGetConstructor(trueParameters);
return(new GenericInstanceConstructorInfo(javaContructor, type, typeInfo));
}
catch (NoSuchMethodException)
{
return(null);
}
}
public static FieldInfo[] GetFields(Type type, BindingFlags flags)
{
List <FieldInfo> ret = new List <FieldInfo>();
while (type != null && type != typeof(object))
{
GenericTypeInfo typeId = GenericInstanceFactory.GetGenericTypeInfo(type);
var typeDef = typeId != null ? typeId.TypeDefinition : type;
var fields = typeDef.JavaGetDeclaredFields();
int startIndex = ret.Count;
for (int i = 0; i < fields.Length; ++i)
{
if (!TypeHelper.Matches(fields[i].Modifiers, flags))
{
continue;
}
ret.Add(new FieldInfo(fields[i], type));
}
ReorderFields(typeDef, startIndex, ret);
if ((flags & BindingFlags.DeclaredOnly) != 0)
{
break;
}
type = type.BaseType;
}
return(ret.ToArray());
}
public static Type MakeGenericType(Type baseType, Type[] types)
{
// emulate Nullable<T>
if (baseType == typeof(Nullable <>))
{
if (types.Length != 1)
{
ThrowHelper.ThrowArgumentException(ExceptionResource.WrongNumberOfArguments);
}
var ret = NullableReflection.GetNullableTFromUnterlyingType(types[0]);
if (ret != null)
{
return(ret);
}
// can't create a nullable instance of non-predifined nullable,
// because of all the compiler-voodoo around Nullables.
return(null);
}
var expected = GetGenericArgumentCount(baseType);
if (types.Length != expected)
{
throw new ArgumentOutOfRangeException("types", string.Format("exected {0} generic arguments, got {1} for type {2}", expected, types.Length, baseType.FullName));
}
return(GenericInstanceFactory.GetOrMakeGenericInstanceType(baseType, types));
}
public static IEnumerable <MethodInfo> GetMethods(Type type, BindingFlags flags)
{
while (type != null)
{
GenericTypeInfo typeId = GenericInstanceFactory.GetGenericTypeInfo(type);
var typeDef = typeId != null ? typeId.TypeDefinition : type;
string possibleExplicitInterfacePrefix = typeDef.JavaIsInterface() ? typeDef.GetSimpleName() + "_" : null;
var methods = typeDef.JavaGetDeclaredMethods();
for (int i = 0; i < methods.Length; ++i)
{
if (!TypeHelper.Matches(methods[i].Modifiers, flags))
{
continue;
}
yield return(new MethodInfo(methods[i], type, possibleExplicitInterfacePrefix));
}
if ((flags & BindingFlags.DeclaredOnly) != 0)
{
break;
}
type = type.BaseType;
}
}
public static Type GetReflectionSafeType(Type type, object obj)
{
if (!(obj is IGenericTypeDefinition)) // fast path
{
return(type);
}
// Note: If java had ephemerons, we could cache the return value.
// Without ephemerons, this doesn't seem to be a good idea.
// We could though create an extra field in each generic type
// to hold the cached value. This would only pay off if
// GetTypeReflectionSafe is actually called multiple times
// on the same object.
var info = GetOrCreateGenericsInfo(type);
Field[] genericsFields = info.GenericInstanceFields;
int length;
if (genericsFields == null || (length = genericsFields.Length) == 0)
{
return(type);
}
Type[] genericParameters;
if (info.GenericInstanceFieldIsTypeArray)
{
genericParameters = (Type[])genericsFields[0].Get(obj);
return(GenericInstanceFactory.GetOrMakeGenericInstanceType(type, genericParameters));
}
if (length > 4)
{
// This can not happen with the current compiler.
genericParameters = genericsFields.Select(f => (Type)f.Get(obj));
return(GenericInstanceFactory.GetOrMakeGenericInstanceType(type, genericParameters));
}
Type p1 = (Type)genericsFields[0].Get(obj);
Type p2 = null, p3 = null, p4 = null;
if (length > 1)
{
p2 = (Type)genericsFields[1].Get(obj);
if (length > 2)
{
p3 = (Type)genericsFields[2].Get(obj);
if (length > 3)
{
p4 = (Type)genericsFields[3].Get(obj);
}
}
}
return(GenericInstanceFactory.GetOrMakeGenericInstanceType(type, p1, p2, p3, p4));
}
/// <summary>
/// will never return null
/// </summary>
public static string GetFullName(Type type)
{
var typeInfo = GenericInstanceFactory.GetGenericTypeInfo(type);
if (typeInfo == null)
{
return(type.JavaGetName().Replace(GenericTickChar, '`'));
}
return(typeInfo.GetFullName());
}
/// <summary>
/// will return null if not a generic proxy type
/// </summary>
public static ConstructorInfo[] GetConstructors(Type type, BindingFlags flags)
{
var typeInfo = GenericInstanceFactory.GetGenericTypeInfo(type);
if (typeInfo == null)
{
return(null);
}
return(typeInfo.TypeDefinition.JavaGetDeclaredConstructors()
.Select(p => (ConstructorInfo) new GenericInstanceConstructorInfo(p, type, typeInfo))
.Where(ctor => Type.IsMatch(ctor, flags)));
}
public static Type[] GetGenericArguments(Type type)
{
Type[] ret;
// generic instance proxy?
var genericTypeInfo = GenericInstanceFactory.GetGenericTypeInfo(type);
if (genericTypeInfo != null)
{
return((Type[])genericTypeInfo.AddOrGetGenericParameters(createTypeArray: true));
}
// Nullable<T>?
Type nullableUnderlying = NullableReflection.GetUnderlyingType(type);
if (nullableUnderlying != null)
{
return(new[] { nullableUnderlying });
}
// java generic type?
var javaTypeParam = type.GetTypeParameters();
if (javaTypeParam.Length != 0)
{
// java generic type. provide some emulation.
ret = new Type[javaTypeParam.Length];
for (int i = 0; i < javaTypeParam.Length; ++i)
{
ret[i] = typeof(object);
}
return(ret);
}
var info = GetOrCreateGenericsInfo(type);
if (info.GenericArgumentCount > 0)
{
// generic definition? We can only return the number of objects.
ret = new Type[info.GenericArgumentCount];
for (int i = 0; i < ret.Length; ++i)
{
ret[i] = typeof(object);
}
return(ret);
}
throw new InvalidOperationException("not a generic type: " + type.FullName);
}
/// <summary>
/// will never return null.
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
public static Type GetBaseType(Type type)
{
if (type == typeof(object))
{
return(null);
}
var genericTypeInfo = GenericInstanceFactory.GetGenericTypeInfo(type);
if (genericTypeInfo == null)
{
return(type.GetSuperclass());
}
var baseType = BaseTypeCache.Get(type);
if (baseType != null)
{
return(baseType == typeof(NullBaseType) ? null : baseType);
}
var typeDef = genericTypeInfo.TypeDefinition;
baseType = typeDef.GetSuperclass();
var annotation = typeDef.GetAnnotation <ITypeReflectionInfo>(typeof(ITypeReflectionInfo));
if (annotation != null)
{
var def = annotation.GenericDefinitions().Select(DefinitionParser.Parse);
if (def.Length > 0)
{
baseType = ToMatchedGenericInstanceType(baseType, type, def);
}
}
BaseTypeCache.PutIfAbsent(type, baseType ?? typeof(NullBaseType));
return(baseType);
}
private static GenericsInfo CreateGenericsInfo(Type type)
{
var info = new GenericsInfo();
if (NullableReflection.TreatAsSystemNullableT(type))
{
info.GenericArgumentCount = -1;
}
else if (GenericInstanceFactory.IsGenericInstanceType(type))
{
info.GenericArgumentCount = -1;
}
else
{
var annotation = type.GetAnnotation <ITypeReflectionInfo>(typeof(ITypeReflectionInfo));
var args = annotation != null?annotation.GenericArgumentCount() : 0;
if (args > 0)
{
var fieldNames = annotation.GenericArgumentsFields();
if (fieldNames.Length > 0)
{
var fields = type.JavaGetDeclaredFields();
info.GenericInstanceFields = fieldNames.Select(name =>
{
var field = fields.FirstOrDefault(f => f.Name == name);
field.IsAccessible = true;
return(field);
});
info.GenericInstanceFieldIsTypeArray = info.GenericInstanceFields.Length == 1 &&
info.GenericInstanceFields[0].Type == typeof(Type[]);
}
}
info.GenericArgumentCount = args == 0 ? -1 : args;
}
return(info);
}
public static Type GetGenericTypeDefinition(Type type)
{
// emulate Nullable<T>
if (NullableReflection.TreatAsSystemNullableT(type))
{
return(typeof(Nullable <>));
}
// is generic proxy?
var ret = GenericInstanceFactory.GetGenericTypeDefinition(type);
if (ret != null)
{
return(ret);
}
// is generic type? just return itself.
if (!IsGenericType(type))
{
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.NotAGenericType);
}
return(type);
}
public static bool IsGenericType(Type type)
{
// Java generic type?
// this call makes Json.NET deserialization about 2.5 times as slow.
// If Java generics have any meanings to us, we would need to cache the
// return value.
//bool hasTypeParameters = type.GetTypeParameters().Length > 0;
//if (hasTypeParameters) return true;
// Nullable<T>?
if (NullableReflection.TreatAsSystemNullableT(type))
{
return(true);
}
// generic proxy?
if (GenericInstanceFactory.IsGenericInstanceType(type))
{
return(true);
}
// .NET generic type definition?
return(IsGenericTypeDefinition(type));
}
private static InheritanceInfo CreateInheritanceInfo(Type type)
{
LinkedHashSet <Type> intf = new LinkedHashSet <Type>();
Java.Util.HashSet <Type> baseTypes = new Java.Util.HashSet <Type>();
baseTypes.Add(typeof(object));
// Note that JavaGetInterfaces will only return interfaces declared by the current type,
// while .NET returns a flattened map of all interfaces.
// http://stackoverflow.com/questions/6616055/get-all-derived-interfaces-of-a-class
// http://stackoverflow.com/questions/9793242/type-getinterfaces-for-declared-interfaces-only
Java.Util.IQueue <Type> toVisit = new Java.Util.LinkedList <Type>();
toVisit.Add(type);
while (toVisit.Peek() != null)
{
var currentType = toVisit.Poll();
var gti = GenericInstanceFactory.GetGenericTypeInfo(currentType);
bool isInterface = gti != null?gti.TypeDefinition.JavaIsInterface() : currentType.JavaIsInterface();
if (!isInterface)
{
var baseType = currentType.BaseType;
if (baseType != null && baseType != typeof(object))
{
toVisit.Add(baseType);
baseTypes.Add(baseType);
}
}
if (gti == null)
{
AddInterfaces(currentType.JavaGetInterfaces(), intf, toVisit);
continue;
}
var typeDef = gti.TypeDefinition;
var interfaces = typeDef.JavaGetInterfaces();
var genericInstanceClass = typeDef.GetAnnotation <ITypeReflectionInfo>(typeof(ITypeReflectionInfo));
if (genericInstanceClass == null)
{
AddInterfaces(interfaces, intf, toVisit);
continue;
}
var def = genericInstanceClass.GenericDefinitions().Select(DefinitionParser.Parse);
if (def.Length == 0)
{
AddInterfaces(interfaces, intf, toVisit);
continue;
}
for (int i = 0; i < interfaces.Length; ++i)
{
interfaces[i] = ToMatchedGenericInstanceType(interfaces[i], currentType, def);
}
AddInterfaces(interfaces, intf, toVisit);
}
return(new InheritanceInfo
{
Interfaces = new JavaCollectionWrapper <Type>(intf).ToArray(),
InterfacesSet = new Java.Util.HashSet <Type>(intf),
BaseTypes = baseTypes
});
}
/// <summary>
/// return the generic type definition if, any or type itself.
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
public static Type EnsureTypeDef(Type type)
{
return(GenericInstanceFactory.GetGenericTypeDefinition(type) ?? type);
}
/// <summary>
/// will never return null
/// </summary>
public static string GetName(Type type)
{
var baseType = GenericInstanceFactory.GetGenericTypeDefinition(type) ?? type;
return(baseType.GetSimpleName().Replace(GenericTickChar, '`'));
}
public static Type ToGenericInstanceType(Type perceivedType, Type parentType, GenericDefinition m)
{
// is a specialized type defined?
var genericInstanceType = m.GenericInstanceType;
if (genericInstanceType != null)
{
return(genericInstanceType);
}
int genericParameter = -1;
var genericArguments = m.GenericArguments;
// is a generic type definition class defined?
var genericTypeDef = m.GenericTypeDefinition;
if (genericTypeDef == null)
{
genericTypeDef = perceivedType;
genericParameter = m.GenericParameter;
}
// retrieve generic parameters if required.
GenericTypeInfo parentGenericArguments = null;
bool needParentGenericArguments = genericParameter >= 0 ||
genericArguments.Any(a => a.FixedType == null);
if (needParentGenericArguments)
{
parentGenericArguments = GenericInstanceFactory.GetGenericTypeInfo(parentType);
if (parentGenericArguments == null)
{
// Can either happen when the generics reflection annotations where not preserved
// (i.e. a bug), when the user did not call GetTypeReflectionSafe() on an object,
// or when requesting generics info not for an instance type, e.g. typeof(List<>).
// As the second case can be difficult to debug, we emit a warning. TODO: we should
// probably not emit a warning when the user code runs in release mode.
Log.W("dot42", string.Format("Unable to reconstruct generic type definition for type {0}, parent type {1}. Did you use obj.GetTypeReflectionSafe()? If you are reflecting on an open generic type, i.e. typeof(List<>) you can ignore this warning.", perceivedType.FullName, parentType.FullName));
return(genericTypeDef);
}
}
if (genericParameter != -1)
{
// ReSharper disable once PossibleNullReferenceException
genericTypeDef = parentGenericArguments.GetGenericParameter(genericParameter);
}
if (genericArguments != null && genericArguments.Length > 0)
{
Type[] genericParameters = new Type[genericArguments.Length];
for (int i = 0; i < genericArguments.Length; ++i)
{
Type resolvedArg;
var arg = genericArguments[i];
if (arg.NestedType != null)
{
resolvedArg = ToGenericInstanceType(typeof(object), parentType, arg.NestedType);
}
else if (arg.FixedType != null)
{
resolvedArg = arg.FixedType;
}
else
{
// must be an index
// ReSharper disable once PossibleNullReferenceException
resolvedArg = parentGenericArguments.GetGenericParameter(arg.ContainingTypeArgumentIndex);
}
genericParameters[i] = resolvedArg;
}
return(GenericInstanceFactory.GetOrMakeGenericInstanceType(genericTypeDef, genericParameters));
}
// return the type.
return(genericTypeDef);
}
