public static ExactBinding <TMessage> TryBuild(
AsyncCollectorBindingProvider <TAttribute, TType> parent,
Mode mode,
BindingProviderContext context)
{
var patternMatcher = parent._patternMatcher;
var parameter = context.Parameter;
TAttribute attributeSource = parameter.GetCustomAttribute <TAttribute>(inherit: false);
Func <TAttribute, Task <TAttribute> > hookWrapper = null;
if (parent.PostResolveHook != null)
{
hookWrapper = (attrResolved) => parent.PostResolveHook(attrResolved, parameter, parent._nameResolver);
}
Func <object, object> buildFromAttribute;
FuncConverter <TMessage, TAttribute, TType> converter = null;
// Prefer the shortest route to creating the user type.
// If TType matches the user type directly, then we should be able to directly invoke the builder in a single step.
// TAttribute --> TUserType
var checker = ConverterManager.GetTypeValidator <TType>();
if (checker.IsMatch(typeof(TMessage)))
{
buildFromAttribute = patternMatcher.TryGetConverterFunc(
typeof(TAttribute), typeof(IAsyncCollector <TMessage>));
}
else
{
var converterManager = parent._converterManager;
// Try with a converter
// Find a builder for : TAttribute --> TType
// and then couple with a converter: TType --> TParameterType
converter = converterManager.GetConverter <TMessage, TType, TAttribute>();
if (converter == null)
{
// Preserves legacy behavior. This means we can only have 1 async collector.
// However, the collector's builder object can switch.
throw NewMissingConversionError(typeof(TMessage));
}
buildFromAttribute = patternMatcher.TryGetConverterFunc(
typeof(TAttribute), typeof(IAsyncCollector <TType>));
}
if (buildFromAttribute == null)
{
return(null);
}
ParameterDescriptor param;
if (parent.BuildParameterDescriptor != null)
{
param = parent.BuildParameterDescriptor(attributeSource, parameter, parent._nameResolver);
}
else
{
param = new ParameterDescriptor
{
Name = parameter.Name,
DisplayHints = new ParameterDisplayHints
{
Description = "output"
}
};
}
var cloner = new AttributeCloner <TAttribute>(attributeSource, context.BindingDataContract, parent._nameResolver, hookWrapper);
return(new ExactBinding <TMessage>(cloner, param, mode, buildFromAttribute, converter));
}
// Parse the signature to determine which mode this is.
// Can also check with converter manager to disambiguate some cases.
private CollectorBindingPattern GetMode(ParameterInfo parameter)
{
Type parameterType = parameter.ParameterType;
if (parameterType.IsGenericType)
{
var genericType = parameterType.GetGenericTypeDefinition();
var elementType = parameterType.GetGenericArguments()[0];
if (genericType == typeof(IAsyncCollector <>))
{
return(new CollectorBindingPattern(Mode.IAsyncCollector, elementType));
}
else if (genericType == typeof(ICollector <>))
{
return(new CollectorBindingPattern(Mode.ICollector, elementType));
}
// A different interface. Let another rule try it.
return(null);
}
if (parameter.IsOut)
{
// How should "out byte[]" bind?
// If there's an explicit "byte[] --> TMessage" converter, then that takes precedence.
// Else, bind over an array of "byte --> TMessage" converters
Type elementType = parameter.ParameterType.GetElementType();
bool hasConverter = this._converterManager.HasConverter <TAttribute>(elementType, typeof(TType));
if (hasConverter)
{
// out T, where T might be an array
return(new CollectorBindingPattern(Mode.OutSingle, elementType));
}
if (elementType.IsArray)
{
// out T[]
var messageType = elementType.GetElementType();
return(new CollectorBindingPattern(Mode.OutArray, messageType));
}
var validator = ConverterManager.GetTypeValidator <TType>();
if (validator.IsMatch(elementType))
{
// out T, t is not an array
return(new CollectorBindingPattern(Mode.OutSingle, elementType));
}
// For out-param ,we don't expect another rule to claim it. So give some rich errors on mismatch.
if (typeof(IEnumerable).IsAssignableFrom(elementType))
{
throw new InvalidOperationException(
"Enumerable types are not supported. Use ICollector<T> or IAsyncCollector<T> instead.");
}
else if (typeof(object) == elementType)
{
throw new InvalidOperationException("Object element types are not supported.");
}
}
// No match. Let another rule claim it
return(null);
}
public static ExactBinding <TUserType> TryBuild(
BindToInputBindingProvider <TAttribute, TType> parent,
BindingProviderContext context)
{
var cm = parent._converterManager;
var patternMatcher = parent._patternMatcher;
var parameter = context.Parameter;
TAttribute attributeSource = parameter.GetCustomAttribute <TAttribute>(inherit: false);
Func <TAttribute, Task <TAttribute> > hookWrapper = null;
if (parent.PostResolveHook != null)
{
hookWrapper = (attrResolved) => parent.PostResolveHook(attrResolved, parameter, parent._nameResolver);
}
var cloner = new AttributeCloner <TAttribute>(attributeSource, context.BindingDataContract, parent._nameResolver, hookWrapper);
Func <object, object> buildFromAttribute;
FuncConverter <TType, TAttribute, TUserType> converter = null;
// Prefer the shortest route to creating the user type.
// If TType matches the user type directly, then we should be able to directly invoke the builder in a single step.
// TAttribute --> TUserType
var checker = ConverterManager.GetTypeValidator <TType>();
if (checker.IsMatch(typeof(TUserType)))
{
buildFromAttribute = patternMatcher.TryGetConverterFunc(typeof(TAttribute), typeof(TUserType));
}
else
{
// Try with a converter
// Find a builder for : TAttribute --> TType
// and then couple with a converter: TType --> TParameterType
converter = cm.GetConverter <TType, TUserType, TAttribute>();
if (converter == null)
{
return(null);
}
buildFromAttribute = patternMatcher.TryGetConverterFunc(typeof(TAttribute), typeof(TType));
}
if (buildFromAttribute == null)
{
return(null);
}
ParameterDescriptor param;
if (parent.BuildParameterDescriptor != null)
{
param = parent.BuildParameterDescriptor(attributeSource, parameter, parent._nameResolver);
}
else
{
param = new ParameterDescriptor
{
Name = parameter.Name,
DisplayHints = new ParameterDisplayHints
{
Description = "input"
}
};
}
return(new ExactBinding <TUserType>(cloner, param, buildFromAttribute, converter));
}
