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Spawner wouldn't spawn Types with optional parameters in ctor due to parameter length check (#92)

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Reetus 2020-02-20 18:08:01 +08:00 • committed by GitHub
parent 717e192cf7
commit 11cac69eba
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2 changed files with 118 additions and 55 deletions
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103
Projects/Server/Utilities/ActivatorUtil.cs
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@ -1,4 +1,5 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
@ -6,68 +7,120 @@ namespace Server.Utilities
{
public static class ActivatorUtil
{
public static ConstructorInfo GetConstructor(Type type, Predicate<ConstructorInfo> predicate = null)
{
ConstructorInfo emptyCtor = type.GetConstructor(Type.EmptyTypes);
public static ConstructorInfo GetConstructor(Type type)
{
try
if (emptyCtor != null && predicate?.Invoke(emptyCtor) != false)
{
return type.GetConstructor(Type.EmptyTypes)
?? type.GetConstructors().Single(info => info.GetParameters().All(x => x.IsOptional))
?? throw new TypeInitializationException(type.ToString(), new Exception($"There is no empty/default constructor for {type}"));
return emptyCtor;
}
catch (Exception e)
ConstructorInfo optionalCtor = type.GetConstructors().SingleOrDefault(info =>
predicate?.Invoke(info) != false && info.GetParameters().All(x => x.IsOptional));
if (optionalCtor != null)
{
throw new TypeInitializationException(type.ToString(), e);
return optionalCtor;
}
throw new TypeInitializationException(type.ToString(),
new Exception($"There is no empty/default constructor for {type} that matches predicate."));
}
public static ConstructorInfo GetConstructor(Type type, params Type[] args)
public static ConstructorInfo GetConstructor(Type type, Predicate<ConstructorInfo> predicate, params Type[] args)
{
try
{
return args.All(x => x != null) ? type.GetConstructor(args) : null ?? type.GetConstructors().Single(info =>
ConstructorInfo ctor;
if (args.All(x => x != null))
{
ctor = type.GetConstructor(args);
if (ctor != null && predicate?.Invoke(ctor) != false)
{
var paramList = info.GetParameters().ToList();
return ctor;
}
}
else
{
ctor = type.GetConstructors().SingleOrDefault(info =>
{
if (predicate?.Invoke(info) == false)
{
return false;
}
List<ParameterInfo> paramList = info.GetParameters().ToList();
// If more args are given than parameters, skip.
if (args.Length > paramList.Count)
{
return false;
}
// check all given args map to params.
for (int i = 0; i < args.Length; i++)
{
// if a null reference is passed, but the type is not nullable
if ((args[i] == null && paramList[i].ParameterType.IsValueType)
// or if an arg is not null and is not assignable to the parameter type, skip.
|| !(args[i] == null || paramList[i].ParameterType.IsAssignableFrom(args[i])))
if (args[i] == null && paramList[i].ParameterType.IsValueType
// or if an arg is not null and is not assignable to the parameter type, skip.
|| !(args[i] == null || paramList[i].ParameterType.IsAssignableFrom(args[i])))
{
return false;
}
}
// If there are more parameters, check if they any are not optional, if any are not, skip.
// Otherwise all checks have passed. We have found a match
return args.Length <= paramList.Count || paramList.GetRange(args.Length, paramList.Count - args.Length).All(x => x.IsOptional);
}) ?? throw new Exception($"There is no empty/default constructor for {type}");
return args.Length <= paramList.Count || paramList.GetRange(args.Length, paramList.Count - args.Length)
.All(x => x.IsOptional);
});
if (ctor != null)
{
return ctor;
}
}
throw new Exception($"There is no empty/default constructor for {type} that matches predicate.");
}
catch (Exception e)
{
throw new TypeInitializationException(type.ToString(), e);
}
}
public static object CreateInstance(Type type)
public static object CreateInstance(Type type, Predicate<ConstructorInfo> constructorPredicate = null)
{
var cctor = GetConstructor(type);
var args = cctor.GetParameters();
ConstructorInfo cctor = GetConstructor(type, constructorPredicate);
ParameterInfo[] args = cctor.GetParameters();
if (args.Length == 0)
{
return cctor.Invoke(Type.EmptyTypes);
var argList = new object[args.Length];
}
object[] argList = new object[args.Length];
Array.Fill(argList, Type.Missing);
return cctor.Invoke(argList);
}
public static object CreateInstance(Type type, params object[] args)
public static object CreateInstance(Type type, Predicate<ConstructorInfo> constructorPredicate = null,
params object[] args)
{
if (args == null || args.Length == 0)
return CreateInstance(type);
var cctor = GetConstructor(type, args.Select(x => x?.GetType()).ToArray());
{
return CreateInstance(type, constructorPredicate);
}
ConstructorInfo cctor = GetConstructor(type, constructorPredicate, args.Select(x => x?.GetType()).ToArray());
return cctor.Invoke(args);
}
public static T CreateInstance<T>() => (T)CreateInstance(typeof(T));
public static T CreateInstance<T>(params object[] args) => (T)CreateInstance(typeof(T), args);
public static object CreateInstance(Type type, params object[] args) => CreateInstance(type, null, args);
public static T CreateInstance<T>(Predicate<ConstructorInfo> constructorPredicate = null) => (T)CreateInstance(typeof(T), constructorPredicate);
public static T CreateInstance<T>(params object[] args) => (T)CreateInstance(typeof(T), null, args);
}
}