/// <summary>
/// Handles the recurring element filters.
/// </summary>
/// <param name="propertyPath">The property path.</param>
/// <param name="isRecurringCriteria">if set to <c>true</c> is recurring criteria.</param>
protected virtual void HandleRecurringElementFilters(string propertyPath, bool isRecurringCriteria = false)
{
// Pull the current filter off the stack
var filter = Context.RecurringFilterStack.Pop();
// Peek at the next filter in the stack, if any
var next = Context.RecurringFilterStack.Any()
? Context.RecurringFilterStack.Peek()
: null;
if (Context.CurrentRecurringFilters.Any())
{
var filters = Context.CurrentRecurringFilters.ToArray();
// Recurring criteria are joined with OR
if (isRecurringCriteria)
{
var recurringFilter = new RecurringElementFilter(propertyPath, filters);
filter.Filters.Add(recurringFilter);
}
else // Otherwise join with AND
{
filter.Filters.AddRange(filters);
}
}
// Reset the reference for the previous list of filters
Context.CurrentRecurringFilters = filter.PreviousFilters;
filter.PreviousFilters = null;
// Stop processing if no filters were included
if (!filter.Filters.Any())
{
return;
}
// Check if this filter should be combined with the next filter in the stack
if (filter.PropertyPath == next?.PropertyPath)
{
Context.CurrentRecurringFilters.Add(filter);
}
else // Otherwise add as root level filters
{
Context.RecurringElementFilters.Add(filter);
// Stop processing if not handling a nested recurring element
if (next == null)
{
return;
}
// Add filter for parent recurring element when nested recurring elements are filtered
Context.CurrentRecurringFilters.Add(new RecurringElementFilter(GetNestedPath(filter.PropertyPath), "Any()",
(dataObject, instance, recurringFilter) => recurringFilter.GetPropertyValue <IList>(instance)?.Count > 0));
}
}
/// <summary>
/// Initializes the recurring element filters.
/// </summary>
/// <param name="propertyPath">The property path.</param>
protected virtual void InitializeRecurringElementFilter(string propertyPath)
{
var filter = new RecurringElementFilter(propertyPath)
{
// Keep a reference to the previous list of filters
PreviousFilters = Context.CurrentRecurringFilters
};
// Put the new filter on the stack
Context.RecurringFilterStack.Push(filter);
// Initialize the list of filters for the current recurring element
Context.CurrentRecurringFilters = new List <RecurringElementFilter>();
}
/// <summary>
/// Filters the recurring elements.
/// </summary>
/// <param name="dataObject">The data object.</param>
/// <param name="instance">The instance.</param>
/// <param name="filter">The filter.</param>
/// <param name="propertyPath">The property path.</param>
protected virtual bool FilterRecurringElements(object dataObject, object instance, RecurringElementFilter filter, string propertyPath)
{
var propertyNames = propertyPath.Split('.');
IList recurringElementList = null;
// Find recurring element list(s) in property path
for (var i = 0; i < propertyNames.Length; i++)
{
// Stop processing if the object instance is null
if (instance == null)
{
return(false);
}
// Process nested recurring elements
if (recurringElementList != null)
{
var nestedPath = string.Join(".", propertyNames.Skip(i));
return(recurringElementList.Cast <object>()
.Aggregate(true, (current, recurringItem) => FilterRecurringElements(dataObject, recurringItem, filter, nestedPath) && current));
}
var propertyType = instance.GetType();
var propertyName = propertyNames[i];
var propertyInfo = propertyType.GetProperty(propertyName);
// Stop processing if the property was not found
if (propertyInfo == null)
{
return(false);
}
// Get the current property value
instance = propertyInfo.GetValue(instance);
recurringElementList = instance as IList;
}
// Stop processing if the list is null
if (recurringElementList == null)
{
return(false);
}
// Process recurring elements
var filteredItems = new ArrayList();
foreach (var recurringItem in recurringElementList)
{
// Check if recurring element doesn't meet criteria
if (!filter.Predicate(dataObject, recurringItem, filter))
{
filteredItems.Add(recurringItem);
}
}
// Remove filtered items from original list
foreach (var item in filteredItems)
{
recurringElementList.Remove(item);
}
return(recurringElementList.Count <= 0);
}
