private static bool CanResolveParameter(ICherryServiceLocatorAndRegistry current,
ParameterInfo constructorParameterInfo, InjectionParameter[] parameters)
{
if (parameters == null || parameters.Length == 0)
{
// Shotcut when no parameters provided
return current.CanGet(constructorParameterInfo.ParameterType);
}
InjectionParameter namedParameter = parameters.SingleOrDefault(p => p.Key == constructorParameterInfo.Name);
if (namedParameter != null)
{
return true;
}
InjectionParameter unnamedParameter = parameters.SingleOrDefault(
p => string.IsNullOrEmpty(p.Key) &&
!ReferenceEquals(p.Value, null)
&& constructorParameterInfo.ParameterType.IsInstanceOfType(p.Value));
if (unnamedParameter != null)
{
return true;
}
return current.CanGet(constructorParameterInfo.ParameterType);
}
public object Get(ICherryServiceLocatorAndRegistry original, ICherryServiceLocatorAndRegistry current,
InjectionParameter[] parameters)
{
ConstructorInfo[] allPublicConstructors = _targetType.GetConstructors();
ConstructorInfo bestConstructor =
allPublicConstructors.OrderByDescending(
c => c.GetParameters().Count(p => CanResolveParameter(current, p, parameters)))
.FirstOrDefault();
if (bestConstructor == null)
{
throw new InvalidOperationException(
string.Format(
"Creating an instance of type \"{0}\" failed. This type has no public constructors that can be satisfied.",
_targetType));
}
ParameterInfo[] constructorParameterInfos = bestConstructor.GetParameters();
ValidateParameters(constructorParameterInfos, parameters);
var constructorParameters = new object[constructorParameterInfos.Length];
for (int i = 0; i < constructorParameterInfos.Length; i++)
{
constructorParameters[i] = ResolveParameter(original, current, constructorParameterInfos, i, parameters);
}
object instance = bestConstructor.Invoke(constructorParameters);
return instance;
}
public object Get(ICherryServiceLocatorAndRegistry original, ICherryServiceLocatorAndRegistry current, InjectionParameter[] parameters)
{
if (parameters != null && parameters.Length > 0)
{
throw new ArgumentException(string.Format("Since \"{0}\" is a singleton instance, you cannot use parameters to resolve it.", _instance), "parameters");
}
return _instance;
}
public object Get(ICherryServiceLocatorAndRegistry original, ICherryServiceLocatorAndRegistry current, InjectionParameter[] parameters)
{
if (parameters != null && parameters.Length > 0)
{
throw new ArgumentException(string.Format("Since \"{0}\" is a singleton instance, you cannot use parameters to resolve it.", _instance), "parameters");
}
if (_instance != null)
{
return _instance;
}
lock (_syncRoot)
{
if (_instance != null)
{
return _instance;
}
var instance = (new PerResolveResolver(_targetType)).Get(original, current, parameters);
_instance = instance;
return instance;
}
}
private IParameter ResolveParameterName(Type serviceKey, IBinding binding, ref Type resolvedType, InjectionParameter injectionParameter)
{
resolvedType = resolvedType ?? TypeToGetResolved(serviceKey, binding);
var constructorParameter = resolvedType.GetConstructors().SelectMany(c => c.GetParameters())
.First(p => p.ParameterType.IsInstanceOfType(injectionParameter.Value));
return new ConstructorArgument(constructorParameter.Name, injectionParameter.Value);
}
private IParameter[] ModifyParameters(Type serviceKey, IBinding binding, InjectionParameter[] parameters)
{
if (parameters == null || parameters.Length == 0)
{
return null;
}
Type resolvedType = null;
return
parameters.Select(
p => string.IsNullOrEmpty(p.Key) ? ResolveParameterName(serviceKey, binding, ref resolvedType, p) : new ConstructorArgument(p.Key, p.Value))
.ToArray();
}
private ResolverOverride ResolveParameterName(Type serviceKey, ContainerRegistration registration,
ref Type resolvedType, InjectionParameter injectionParameter)
{
resolvedType = resolvedType ?? TypeToGetResolved(serviceKey, registration);
ParameterInfo constructorParameter = resolvedType.GetConstructors().SelectMany(c => c.GetParameters())
.First(p => p.ParameterType.IsInstanceOfType(injectionParameter.Value));
return new ParameterOverride(constructorParameter.Name, injectionParameter.Value);
}
private ResolverOverride[] ModifyParameters(Type serviceKey, ContainerRegistration registration,
InjectionParameter[] parameters)
{
if (parameters == null || parameters.Length == 0)
{
return null;
}
Type resolvedType = null;
return
parameters.Select(
p =>
string.IsNullOrEmpty(p.Key)
? ResolveParameterName(serviceKey, registration, ref resolvedType, p)
: new ParameterOverride(p.Key, p.Value))
.ToArray();
}
private static object ResolveParameter(ICherryServiceLocatorAndRegistry original,
ICherryServiceLocatorAndRegistry current, ParameterInfo[] constructorParameterInfos, int i,
InjectionParameter[] parameters)
{
ParameterInfo constructorParameterInfo = constructorParameterInfos[i];
if (parameters == null || parameters.Length == 0)
{
// Shotcut when no parameters provided
return current.Get(original, constructorParameterInfo.ParameterType);
}
InjectionParameter namedParameter = parameters.SingleOrDefault(p => p.Key == constructorParameterInfo.Name);
if (namedParameter != null)
{
return namedParameter.Value;
}
// No matching named parameter found, so lets try if we have a single parameter that mathes the constructor parameter type
InjectionParameter unnamedParameter = parameters.SingleOrDefault(
p => string.IsNullOrEmpty(p.Key) &&
!ReferenceEquals(p.Value, null)
&& constructorParameterInfo.ParameterType.IsInstanceOfType(p.Value));
if (unnamedParameter != null)
{
return unnamedParameter.Value;
}
return current.Get(original, constructorParameterInfo.ParameterType);
}
private void ValidateParameters(IEnumerable<ParameterInfo> constructorParameterInfos, InjectionParameter[] parameters)
{
if (parameters == null || parameters.Length == 0)
{
return;
}
var namedParametersWithoutMatchingConstructorParameter =
parameters.Where(
p => !string.IsNullOrEmpty(p.Key) && constructorParameterInfos.All(cp => cp.Name != p.Key));
if (namedParametersWithoutMatchingConstructorParameter.Any())
{
throw new ArgumentException("The provided parameters contain parameter names that cannot be matched to the constructor of type " + _targetType, "parameters");
}
var unnamedParametersByType = parameters
.Where(p => string.IsNullOrEmpty(p.Key) &&
!ReferenceEquals(p.Value, null))
.GroupBy(p => p.Value.GetType())
.Select(p => new {Type = p.Key, Count = p.Count()})
.ToArray();
if (unnamedParametersByType.Any(p => p.Count > 1))
{
throw new ArgumentException("The provided parameters contain multiple unnamed parameters with the same type", "parameters");
}
if (
unnamedParametersByType.Any(
p => constructorParameterInfos.Count(cp => cp.ParameterType.IsAssignableFrom(p.Type)) > 1))
{
throw new ArgumentException("The provided parameters contain unnamed parameters that cannot be mapped unambiguously to the constructor of type " + _targetType, "parameters");
}
}
