/// <summary>
///
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
public static bool ShouldCreate(this ServiceDescriptorConfiguration item)
{
bool returnValue = false;
if (item.Condition != null)
{
returnValue = Configuration[item.Condition.Key] == item.Condition.Value;
}
else
{
returnValue = true;
}
return(returnValue);
}
/// <summary>
///
/// </summary>
/// <param name="item"></param>
/// <param name="typeSource"></param>
/// <returns></returns>
public static string ExtractTypeDefinition(this ServiceDescriptorConfiguration item, TypeSource typeSource)
{
string returnValue = null;
if (typeSource == TypeSource.Implemenation)
{
returnValue = item.ImplementationType;
}
else
{
returnValue = item.ServiceType;
}
return(returnValue);
}
/// <summary>
///
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
public static ServiceDescriptor CreateServiceDescriptor(this ServiceDescriptorConfiguration item)
{
ServiceDescriptor returnValue = null;
if (item.ShouldCreate())
{
//
// Get the service type.
//
Type serviceType = item.FindType(TypeSource.Service);
//
// Get the implementation type.
//
Type implementationType = item.FindType(TypeSource.Implemenation);
//
// Check if the implementation type has any dependency properties.
//
IEnumerable <DependencyInfo> dependencyProperties = DependencyAttribute.GetDependencyProperties(implementationType);
//
// Select the lifetime.
//
ServiceLifetime lifetime = item.Lifetime == "Scoped" ? ServiceLifetime.Scoped : item.Lifetime == "Singleton" ? ServiceLifetime.Singleton : ServiceLifetime.Transient;
//
// Create the descriptor.
//
if (item.Properties == null && !dependencyProperties.Any())
{
//
// Standard definition.
//
returnValue = ServiceDescriptor.Describe(serviceType, implementationType, lifetime);
}
else
{
//
// Factory based definition.
//
returnValue = ServiceDescriptor.Describe(serviceType, sp => (new DependencyFactory(implementationType, item, dependencyProperties)).GetInstance(sp), lifetime);
}
}
return(returnValue);
}
/// <summary>
///
/// </summary>
/// <param name="item"></param>
/// <param name="typeSource"></param>
/// <returns></returns>
public static Type FindType(this ServiceDescriptorConfiguration item, TypeSource typeSource)
{
Type returnValue = null;
//
// Get the actual type definition. The type definition
// passed here can contain one or more aliases.
//
string actualTypeDefinition = item.TransformAlias(typeSource);
//
// Get the type.
//
returnValue = Type.GetType(actualTypeDefinition, true);
return(returnValue);
}
/// <summary>
///
/// </summary>
/// <param name="implementationType"></param>
/// <param name="configuration"></param>
/// <param name="dependencyProperties"></param>
public DependencyFactory(Type implementationType, ServiceDescriptorConfiguration configuration, IEnumerable <DependencyInfo> dependencyProperties)
{
this.ImplementationType = implementationType;
this.Configuration = configuration;
this.DependencyProperties = dependencyProperties;
}
/// <summary>
///
/// </summary>
/// <param name="item"></param>
/// <param name="typeSource"></param>
/// <returns></returns>
public static string TransformAlias(this ServiceDescriptorConfiguration item, TypeSource typeSource)
{
return(TransformAlias(item.ExtractTypeDefinition(typeSource)));
}