/// <summary>
/// Processes the value.
/// </summary>
/// <returns>
/// The <see cref="object" /> representing the processed value.
/// </returns>
/// <exception cref="System.NotImplementedException"></exception>
public override object ProcessValue()
{
var defaultValue = DefaultValue;
var recursive = Recursive;
var propName = this.Context.PropertyDescriptor != null ? this.Context.PropertyDescriptor.Name : string.Empty;
var altPropName = string.Empty;
// Check for umbraco properties attribute on class
if (this.Context.TargetType != null)
{
var classAttr = this.Context.TargetType
.GetCustomAttribute <UmbracoPropertiesAttribute>();
if (classAttr != null)
{
// Apply the prefix
if (!string.IsNullOrWhiteSpace(classAttr.Prefix))
{
altPropName = propName;
propName = classAttr.Prefix + propName;
}
// Apply global recursive setting
recursive |= classAttr.Recursive;
}
}
var umbracoPropertyName = PropertyName ?? propName;
var altUmbracoPropertyName = AltPropertyName ?? altPropName;
var content = this.Context.Content;
if (content == null)
{
return(defaultValue);
}
var contentType = content.GetType();
object propertyValue = null;
// Try fetching the value.
if (!umbracoPropertyName.IsNullOrWhiteSpace())
{
var contentProperty = contentType.GetProperty(umbracoPropertyName, BindingFlags.Public | BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Static);
if (contentProperty != null)
{
// This is more than 2x as fast as propertyValue = contentProperty.GetValue(content, null);
propertyValue = PropertyInfoInvocations.GetValue(contentProperty, content);
}
if (propertyValue == null)
{
propertyValue = content.GetPropertyValue(umbracoPropertyName, recursive);
}
}
// Try fetching the alt value.
if ((propertyValue == null || propertyValue.ToString().IsNullOrWhiteSpace()) &&
!string.IsNullOrWhiteSpace(altUmbracoPropertyName))
{
var contentProperty = contentType.GetProperty(altUmbracoPropertyName, BindingFlags.Public | BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Static);
if (contentProperty != null)
{
// This is more than 2x as fast as propertyValue = contentProperty.GetValue(content, null);
propertyValue = PropertyInfoInvocations.GetValue(contentProperty, content);
}
if (propertyValue == null)
{
propertyValue = content.GetPropertyValue(altUmbracoPropertyName, recursive);
}
}
// Try setting the default value.
if ((propertyValue == null || propertyValue.ToString().IsNullOrWhiteSpace()) &&
defaultValue != null)
{
propertyValue = defaultValue;
}
return(propertyValue);
}
/// <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="culture">
/// The <see cref="CultureInfo"/>
/// </param>
/// <param name="instance">
/// An existing instance of T to populate
/// </param>
/// <param name="processorContexts">
/// A collection of <see cref="DittoProcessorContext"/> entities to use whilst processing values.
/// </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>
/// <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,
CultureInfo culture = null,
object instance = null,
IEnumerable <DittoProcessorContext> processorContexts = null,
Action <DittoConversionHandlerContext> onConverting = null,
Action <DittoConversionHandlerContext> onConverted = null)
{
// Get the default constructor, parameters and create an instance of the type.
// Try and return from the cache first. TryGetValue is faster than GetOrAdd.
ParameterInfo[] constructorParams;
ConstructorCache.TryGetValue(type, out constructorParams);
bool hasParameter = false;
if (constructorParams == null)
{
var constructor = type.GetConstructors().OrderBy(x => x.GetParameters().Length).FirstOrDefault();
if (constructor != null)
{
constructorParams = constructor.GetParameters();
ConstructorCache.TryAdd(type, constructorParams);
}
}
// If not already an instance, create an instance of the object
if (instance == null)
{
if (constructorParams != null && constructorParams.Length == 0)
{
// Internally this uses Activator.CreateInstance which is heavily optimized.
instance = type.GetInstance();
}
else if (constructorParams != null && constructorParams.Length == 1 & constructorParams[0].ParameterType == typeof(IPublishedContent))
{
// This extension method is about 7x faster than the native implementation.
instance = type.GetInstance(content);
hasParameter = true;
}
else
{
// No valid constructor, but see if the value can be cast to the type
if (type.IsInstanceOfType(content))
{
instance = content;
}
else
{
throw new InvalidOperationException(string.Format("Can't convert IPublishedContent to {0} as it has no valid constructor. A valid constructor is either an empty one, or one accepting a single IPublishedContent parameter.", type));
}
}
}
// Collect all the properties of the given type and loop through writable ones.
PropertyInfo[] virtualProperties;
PropertyInfo[] nonVirtualProperties;
VirtualPropertyCache.TryGetValue(type, out virtualProperties);
PropertyCache.TryGetValue(type, out nonVirtualProperties);
if (virtualProperties == null && nonVirtualProperties == null)
{
var properties = type.GetProperties(BindingFlags.Public | BindingFlags.Instance)
.Where(x => x.CanWrite && x.GetSetMethod() != null).ToArray();
// Split out the properties.
virtualProperties = properties.Where(p => p.IsVirtualAndOverridable()).ToArray();
nonVirtualProperties = properties.Except(virtualProperties).ToArray();
VirtualPropertyCache.TryAdd(type, virtualProperties);
PropertyCache.TryAdd(type, nonVirtualProperties);
}
// Gets the default processor for this conversion.
var defaultProcessorType = DittoProcessorRegistry.Instance.GetDefaultProcessorType(type);
// A dictionary to store lazily invoked values.
var lazyProperties = new Dictionary <string, Lazy <object> >();
// If there are any virtual properties we want to lazily invoke them.
if (virtualProperties != null && virtualProperties.Any())
{
foreach (var propertyInfo in virtualProperties)
{
using (DittoDisposableTimer.DebugDuration <object>(string.Format("ForEach Virtual Property ({1} {0})", propertyInfo.Name, content.Id)))
{
// Check for the ignore attribute.
var ignoreAttr = propertyInfo.GetCustomAttribute <DittoIgnoreAttribute>();
if (ignoreAttr != null)
{
continue;
}
// Create a Lazy<object> to deferr returning our value.
var deferredPropertyInfo = propertyInfo;
var localInstance = instance;
lazyProperties.Add(propertyInfo.Name, new Lazy <object>(() => GetProcessedValue(content, culture, type, deferredPropertyInfo, localInstance, defaultProcessorType, processorContexts)));
}
}
// Create a proxy instance to replace our object.
var interceptor = new LazyInterceptor(instance, lazyProperties);
var factory = new ProxyFactory();
instance = hasParameter
? factory.CreateProxy(type, interceptor, content)
: factory.CreateProxy(type, interceptor);
}
// We have the instance object but haven't yet populated properties
// so fire the on converting event handlers
OnConverting(content, type, instance, onConverting);
// Now loop through and convert non-virtual properties.
if (nonVirtualProperties != null && nonVirtualProperties.Any())
{
foreach (var propertyInfo in nonVirtualProperties)
{
using (DittoDisposableTimer.DebugDuration <object>(string.Format("ForEach Property ({1} {0})", propertyInfo.Name, content.Id)))
{
// Check for the ignore attribute.
var ignoreAttr = propertyInfo.GetCustomAttribute <DittoIgnoreAttribute>();
if (ignoreAttr != null)
{
continue;
}
// Set the value normally.
// ReSharper disable once PossibleMultipleEnumeration
var value = GetProcessedValue(content, culture, type, propertyInfo, instance, defaultProcessorType, processorContexts);
// This is 2x as fast as propertyInfo.SetValue(instance, value, null);
PropertyInfoInvocations.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, instance, onConverted);
return(instance);
}