/// <summary>
/// Returns the processed value for the given type and property.
/// </summary>
/// <param name="content">The <see cref="IPublishedContent" /> to convert.</param>
/// <param name="culture">The <see cref="CultureInfo" /></param>
/// <param name="targetType">The target type.</param>
/// <param name="propertyInfo">The <see cref="PropertyInfo" /> property info associated with the type.</param>
/// <param name="instance">The instance to assign the value to.</param>
/// <param name="contextAccessor">The context accessor.</param>
/// <param name="chainContext">The <see cref="DittoChainContext"/> for the current processor chain.</param>
/// <returns>
/// The <see cref="object" /> representing the Umbraco value.
/// </returns>
private static object GetProcessedValue(
IPublishedContent content,
CultureInfo culture,
Type targetType,
PropertyInfo propertyInfo,
object instance,
IDittoContextAccessor contextAccessor,
DittoChainContext chainContext)
{
using (DittoDisposableTimer.DebugDuration <Ditto>($"Processing '{propertyInfo.Name}' ({content.Id})"))
{
// Get the target property description
var propertyDescriptor = TypeDescriptor.GetProperties(instance)[propertyInfo.Name];
// Create a base processor context for this current chain level
var baseProcessorContext = new DittoProcessorContext
{
Content = content,
TargetType = targetType,
PropertyDescriptor = propertyDescriptor,
Culture = culture
};
// Check for cache attribute
var cacheAttr = propertyInfo.GetCustomAttribute <DittoCacheAttribute>(true);
if (cacheAttr != null)
{
var ctx = new DittoCacheContext(cacheAttr, content, targetType, propertyDescriptor, culture);
return(cacheAttr.GetCacheItem(ctx, () => DoGetProcessedValue(content, propertyInfo, contextAccessor, baseProcessorContext, chainContext)));
}
else
{
return(DoGetProcessedValue(content, propertyInfo, contextAccessor, baseProcessorContext, chainContext));
}
}
}
/// <summary>
/// Returns the processed value for the given type and property.
/// </summary>
/// <param name="content">The content.</param>
/// <param name="propertyInfo">The property information.</param>
/// <param name="contextAccessor">The context accessor.</param>
/// <param name="baseProcessorContext">The base processor context.</param>
/// <param name="chainContext">The <see cref="DittoChainContext"/> for the current processor chain.</param>
/// <returns>Returns the processed value.</returns>
private static object DoGetProcessedValue(
IPublishedContent content,
PropertyInfo propertyInfo,
IDittoContextAccessor contextAccessor,
DittoProcessorContext baseProcessorContext,
DittoChainContext chainContext)
{
// Check the property for any explicit processor attributes
var processorAttrs = propertyInfo.GetCustomAttributes <DittoProcessorAttribute>(true)
.OrderBy(x => x.Order)
.ToList();
if (!processorAttrs.Any())
{
// Adds the default processor for this conversion
processorAttrs.Add(DittoProcessorRegistry.Instance.GetDefaultProcessorFor(baseProcessorContext.TargetType));
}
var propertyType = propertyInfo.PropertyType;
// Check for type registered processors
processorAttrs.AddRange(propertyType
.GetCustomAttributes <DittoProcessorAttribute>(true)
.OrderBy(x => x.Order));
// Check any type arguments in generic enumerable types.
// This should return false against typeof(string) etc also.
var typeInfo = propertyType.GetTypeInfo();
bool isEnumerable = false;
Type typeArg = null;
if (propertyType.IsCastableEnumerableType())
{
typeArg = typeInfo.GenericTypeArguments.First();
processorAttrs.AddRange(typeInfo
.GenericTypeArguments
.First()
.GetCustomAttributes <DittoProcessorAttribute>(true)
.OrderBy(x => x.Order)
.ToList());
isEnumerable = true;
}
// Check for globally registered processors
processorAttrs.AddRange(DittoProcessorRegistry.Instance.GetRegisteredProcessorAttributesFor(propertyInfo.PropertyType));
// Add any core processors onto the end
processorAttrs.AddRange(DittoProcessorRegistry.Instance.GetPostProcessorAttributes());
// Create holder for value as it's processed
object currentValue = content;
// Process attributes
foreach (var processorAttr in processorAttrs)
{
using (DittoDisposableTimer.DebugDuration <Ditto>($"Processor '{processorAttr.GetType().Name}' ({content.Id})"))
{
// Get the right context type
var ctx = chainContext.ProcessorContexts.GetOrCreate(baseProcessorContext, processorAttr.ContextType);
// Populate UmbracoContext & ApplicationContext
processorAttr.UmbracoContext = contextAccessor.UmbracoContext;
processorAttr.ApplicationContext = contextAccessor.ApplicationContext;
// Process value
currentValue = processorAttr.ProcessValue(currentValue, ctx, chainContext);
}
}
// The following has to happen after all the processors.
if (isEnumerable && currentValue != null && currentValue.Equals(Enumerable.Empty <object>()))
{
if (propertyType.IsInterface)
{
// You cannot set an enumerable of type from an empty object array.
currentValue = EnumerableInvocations.Cast(typeArg, (IEnumerable)currentValue);
}
else
{
// This should allow the casting back of IEnumerable<T> to an empty List<T> Collection<T> etc.
// I cant think of any that don't have an empty constructor
currentValue = propertyType.GetInstance();
}
}
return((currentValue == null && propertyType.IsValueType)
? propertyInfo.PropertyType.GetInstance() // Set to default instance of value type
: currentValue);
}
/// <summary>
/// Returns an object representing the given <see cref="Type"/>.
/// </summary>
/// <param name="content">
/// The <see cref="IPublishedContent"/> to convert.
/// </param>
/// <param name="type">
/// The <see cref="Type"/> of items to return.
/// </param>
/// <param name="contextAccessor">
/// The context accessor.
/// </param>
/// <param name="culture">
/// The <see cref="CultureInfo"/>
/// </param>
/// <param name="instance">
/// An existing instance of T to populate
/// </param>
/// <param name="onConverting">
/// The <see cref="Action{ConversionHandlerContext}"/> to fire when converting.
/// </param>
/// <param name="onConverted">
/// The <see cref="Action{ConversionHandlerContext}"/> to fire when converted.
/// </param>
/// <param name="chainContext">
/// The <see cref="DittoChainContext"/> for the current processor chain.
/// </param>
/// <returns>
/// The converted <see cref="Object"/> as the given type.
/// </returns>
/// <exception cref="InvalidOperationException">
/// Thrown if the given type has invalid constructors.
/// </exception>
private static object ConvertContent(
IPublishedContent content,
Type type,
IDittoContextAccessor contextAccessor,
CultureInfo culture,
object instance,
Action <DittoConversionHandlerContext> onConverting,
Action <DittoConversionHandlerContext> onConverted,
DittoChainContext chainContext)
{
// Collect all the properties of the given type and loop through writable ones.
PropertyInfo[] properties;
PropertyCache.TryGetValue(type, out properties);
if (properties == null)
{
properties = type.GetProperties(BindingFlags.Public | BindingFlags.Instance)
.Where(x => x.CanWrite && x.GetSetMethod() != null).ToArray();
PropertyCache.TryAdd(type, properties);
}
// Check the validity of the mpped type constructor as early as possible.
ParameterInfo[] constructorParams = type.GetConstructorParameters();
bool validConstructor = false;
bool hasParameter = false;
bool isType = false;
bool hasLazy = false;
if (constructorParams != null)
{
// Is it PublishedContentmModel or similar?
if (constructorParams.Length == 1 && constructorParams[0].ParameterType == typeof(IPublishedContent))
{
hasParameter = true;
}
if (constructorParams.Length == 0 || hasParameter)
{
validConstructor = true;
}
}
// No valid constructor, but see if the value can be cast to the type
if (type.IsInstanceOfType(content))
{
isType = true;
validConstructor = true;
}
if (!validConstructor)
{
throw new InvalidOperationException(
$"Cannot convert IPublishedContent to {type} as it has no valid constructor. " +
"A valid constructor is either an empty one, or one accepting a single IPublishedContent parameter.");
}
PropertyInfo[] lazyProperties = null;
// If not already an instance, create an instance of the object
if (instance == null)
{
// We can only proxy new instances.
lazyProperties = properties.Where(x => x.ShouldAttemptLazyLoad()).ToArray();
if (lazyProperties.Any())
{
hasLazy = true;
var factory = new ProxyFactory();
instance = hasParameter
? factory.CreateProxy(type, lazyProperties.Select(x => x.Name), content)
: factory.CreateProxy(type, lazyProperties.Select(x => x.Name));
}
else if (isType)
{
instance = content;
}
else
{
// 1: This extension method is about 7x faster than the native implementation.
// 2: Internally this uses Activator.CreateInstance which is heavily optimized.
instance = hasParameter
? type.GetInstance(content) // 1
: type.GetInstance(); // 2
}
}
// We have the instance object but haven't yet populated properties
// so fire the on converting event handlers
OnConverting(content, type, culture, instance, onConverting);
if (hasLazy)
{
// A dictionary to store lazily invoked values.
var lazyMappings = new Dictionary <string, Lazy <object> >();
foreach (var propertyInfo in lazyProperties)
{
// Configure lazy properties
using (DittoDisposableTimer.DebugDuration <Ditto>($"Lazy Property ({content.Id} {propertyInfo.Name})"))
{
// Ensure it's a virtual property (Only relevant to property level lazy loads)
if (!propertyInfo.IsVirtualAndOverridable())
{
throw new InvalidOperationException($"Lazy property '{propertyInfo.Name}' of type '{type.AssemblyQualifiedName}' must be declared virtual in order to be lazy loadable.");
}
lazyMappings.Add(propertyInfo.Name, new Lazy <object>(() => GetProcessedValue(content, culture, type, propertyInfo, instance, contextAccessor, chainContext)));
}
}
((IProxy)instance).Interceptor = new LazyInterceptor(lazyMappings);
}
// Process any non lazy properties
foreach (var propertyInfo in properties.Where(x => !x.ShouldAttemptLazyLoad()))
{
// Check for the ignore attribute.
if (propertyInfo.HasCustomAttribute <DittoIgnoreAttribute>())
{
continue;
}
// Set the value normally.
var value = GetProcessedValue(content, culture, type, propertyInfo, instance, contextAccessor, chainContext);
// This over 4x faster as propertyInfo.SetValue(instance, value, null);
FastPropertyAccessor.SetValue(propertyInfo, instance, value);
}
// We have now finished populating the instance object so go ahead
// and fire the on converted event handlers
OnConverted(content, type, culture, instance, onConverted);
return(instance);
}
