public void ShouldGetInstanceTypeWithConstrains(Type type, Type targetType, Type expectedType)
{
// Given
var dependency = new AutowiringDependency(type);
// When
var actualType = dependency.GetInstanceTypeBasedOnTargetGenericConstrains(targetType);
// Then
actualType.ShouldBe(expectedType);
}
public bool TryBuildExpression(IBuildContext buildContext, ILifetime lifetime, out Expression expression, out Exception error)
{
var resolvedKey = _keyResolver(buildContext.Key);
buildContext.CreateChild(resolvedKey, buildContext.Container);
var type = resolvedKey.Type;
var hasExpression = new AutowiringDependency(type, buildContext.AutowiringStrategy).TryBuildExpression(buildContext, lifetime, out expression, out error);
if (_options.HasFlag(Options.ResolveArgs))
{
var argsResolverType = ArgsResolverDescriptor.MakeGenericType(type).Descriptor();
var ctor = argsResolverType.GetDeclaredConstructors().Single(i => i.GetParameters().Length == 1);
var resolverVar = Expression.Variable(argsResolverType.Type);
var fallbackExpression = expression;
if (!hasExpression)
{
if (_options.HasFlag(Options.ResolveDefaults) && type.Descriptor().IsValueType())
{
fallbackExpression = Expression.Default(type);
}
else
{
fallbackExpression = Expression.Block(
Expression.Throw(
Expression.Constant(
new InvalidOperationException($"Cannot find a dependency for {buildContext.Key} in {buildContext.Container}. Try passing an argument of corresponding type assignable to {type.GetShortName()} via one of a Func<> arguments..\n{buildContext}"))),
Expression.Default(type));
}
}
expression = Expression.Block(
new[] { resolverVar },
Expression.Assign(resolverVar, Expression.New(ctor, buildContext.ArgsParameter)),
Expression.Condition(
Expression.Field(resolverVar, nameof(ArgsResolver <object> .HasValue)),
Expression.Field(resolverVar, nameof(ArgsResolver <object> .Value)),
fallbackExpression)
);
return(true);
}
if (_options.HasFlag(Options.ResolveDefaults) && type.Descriptor().IsValueType())
{
expression = Expression.Default(type);
error = default(Exception);
return(true);
}
return(true);
}
