/// <summary>
/// Processes the value.
/// </summary>
/// <param name="value">The value.</param>
/// <param name="context">The context.</param>
/// <param name="chainContext">The chain context.</param>
/// <returns>
/// The <see cref="object" /> representing the processed value.
/// </returns>
internal virtual object ProcessValue(
object value,
DittoProcessorContext context,
DittoChainContext chainContext)
{
if (value != null && this.ValueType.IsInstanceOfType(value) == false)
{
throw new ArgumentException($"Expected a value argument of type {this.ValueType} but got {value.GetType()}", "value");
}
if (context == null)
{
throw new ArgumentNullException("context");
}
if (this.ContextType.IsInstanceOfType(context) == false)
{
throw new ArgumentException($"Expected a context argument of type {this.ContextType} but got {context.GetType()}", "context");
}
if (chainContext == null)
{
throw new ArgumentNullException("chainContext");
}
this.Value = value;
this.Context = context;
this.ChainContext = chainContext;
var ctx = new DittoCacheContext(this, context.Content, context.TargetType, context.PropertyInfo, context.Culture);
return(this.GetCacheItem(ctx, this.ProcessValue));
}
/// <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="config">The Ditto configuration for the type.</param>
/// <param name="mappableProperty">Information about the mappable property.</param>
/// <param name="instance">The instance to assign the value to.</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,
DittoTypeInfo config,
DittoTypeInfo.DittoTypePropertyInfo mappableProperty,
object instance,
DittoChainContext chainContext)
{
using (DittoDisposableTimer.DebugDuration(typeof(Ditto), $"Processing '{mappableProperty.PropertyInfo.Name}' ({content.Id})"))
{
// Create a base processor context for this current chain level
var baseProcessorContext = new DittoProcessorContext
{
Content = content,
TargetType = config.TargetType,
PropertyInfo = mappableProperty.PropertyInfo,
Culture = culture
};
// Check for cache attribute
if (mappableProperty.IsCacheable)
{
var ctx = new DittoCacheContext(mappableProperty.CacheInfo, content, config.TargetType, mappableProperty.PropertyInfo, culture);
return(mappableProperty.CacheInfo.GetCacheItem(ctx, () => DoGetProcessedValue(content, mappableProperty, baseProcessorContext, chainContext)));
}
else
{
return(DoGetProcessedValue(content, mappableProperty, baseProcessorContext, chainContext));
}
}
}
/// <summary>
/// Processes the value.
/// </summary>
/// <param name="value">The value.</param>
/// <param name="context">The context.</param>
/// <returns>
/// The <see cref="object" /> representing the processed value.
/// </returns>
internal virtual object ProcessValue(
object value,
DittoProcessorContext context)
{
if (value != null && !ValueType.IsInstanceOfType(value))
{
throw new ArgumentException("Expected a value argument of type " + ValueType + " but got " + value.GetType(), "value");
}
if (context == null)
{
throw new ArgumentNullException("context");
}
if (!ContextType.IsInstanceOfType(context))
{
throw new ArgumentException("Expected a context argument of type " + ContextType + " but got " + context.GetType(), "context");
}
Value = value;
Context = context;
var ctx = new DittoCacheContext(this, context.Content, context.TargetType, context.PropertyDescriptor, context.Culture);
return(this.GetCacheItem(ctx, this.ProcessValue));
}
/// <summary>
/// Populates the core context fields.
/// </summary>
/// <param name="baseProcessorContext">The base processor content.</param>
/// <returns>Returns the Ditto processors context.</returns>
internal DittoProcessorContext Populate(DittoProcessorContext baseProcessorContext)
{
Content = baseProcessorContext.Content;
TargetType = baseProcessorContext.TargetType;
PropertyDescriptor = baseProcessorContext.PropertyDescriptor;
Culture = baseProcessorContext.Culture;
return(this);
}
/// <summary>
/// Gets or creates the <see cref="DittoProcessorContext" />.
/// </summary>
/// <param name="baseContext">The base context.</param>
/// <param name="contextType">The object type of the content.</param>
/// <returns>Returns the the <see cref="DittoProcessorContext" />.</returns>
public DittoProcessorContext GetOrCreate(DittoProcessorContext baseContext, Type contextType)
{
// Get, clone and populate the relevant context for the given level
var ctx = _processorContexts
.GetOrAdd(contextType, type => (DittoProcessorContext)contextType.GetInstance())
.Clone()
.Populate(baseContext);
return(ctx);
}
/// <summary>Returns the processed value for the given type and property.</summary>
/// <param name="content">The content.</param>
/// <param name="mappableProperty">Information about the mappable property.</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,
DittoTypeInfo.DittoTypePropertyInfo mappableProperty,
DittoProcessorContext baseProcessorContext,
DittoChainContext chainContext)
{
// Create holder for value as it's processed
object currentValue = content;
// Process attributes
foreach (var processorAttr in mappableProperty.Processors)
{
using (DittoDisposableTimer.DebugDuration(typeof(Ditto), $"Processor '{processorAttr}' ({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 (mappableProperty.IsEnumerable && currentValue != null && currentValue.Equals(Enumerable.Empty <object>()))
{
if (mappableProperty.PropertyInfo.PropertyType.IsInterface)
{
// You cannot set an enumerable of type from an empty object array.
currentValue = EnumerableInvocations.Cast(mappableProperty.EnumerableType, (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 = mappableProperty.PropertyInfo.PropertyType.GetInstance();
}
}
return(currentValue == null && mappableProperty.PropertyInfo.PropertyType.IsValueType
? mappableProperty.PropertyInfo.PropertyType.GetInstance() // Set to default instance of value type
: currentValue);
}
/// <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>
/// Processes the value.
/// </summary>
/// <param name="value">The value.</param>
/// <param name="context">The context.</param>
/// <returns>
/// The <see cref="object" /> representing the processed value.
/// </returns>
internal virtual object ProcessValue(
object value,
DittoProcessorContext context)
{
return(this.ProcessValue(value, context, new DittoChainContext(new[] { context })));
}
/// <summary>
/// Adds a processor context to the collection chain.
/// </summary>
/// <param name="ctx">The processor context.</param>
public void Add(DittoProcessorContext ctx)
{
_processorContexts.AddOrUpdate(ctx.GetType(), ctx, (type, ctx2) => ctx2); // Don't override if already exists
}
/// <summary>
/// Adds the context.
/// </summary>
/// <param name="context">The context.</param>
public void AddContext(DittoProcessorContext context)
{
this.lookup.AddOrUpdate(context.GetType(), context.Populate(content, targetType, propertyDescriptor, culture), (type, ctx) => ctx); // Don't override if already exists
}
