/// <summary>
/// Generates a list of <see cref="FieldSelectorPart"/> for each <see cref="PropertyInfo"/> in the supplied list.
/// </summary>
/// <param name="propertyInfos">The <see cref="PropertyInfo"/> instances.</param>
/// <param name="currentDeep">The current deep of the recursion.</param>
/// <param name="maximumDeep">The maximum recursion deep to prevent a <see cref="StackOverflowException" /> on endless nested types.</param>
/// <returns>The list of <see cref="FieldSelectorPart"/>.</returns>
/// <exception cref="ArgumentNullException">The value of '<paramref name="propertyInfos"/>' cannot be null. </exception>
private IEnumerable <FieldSelectorPart> GenerateChildTreeFromProperties([NotNull] IEnumerable <PropertyInfo> propertyInfos, Int32 currentDeep, Int32 maximumDeep)
{
if (propertyInfos == null)
{
throw new ArgumentNullException(nameof(propertyInfos));
}
if (currentDeep == maximumDeep)
{
yield break;
}
foreach (var propertyInfo in propertyInfos)
{
var partName = this.partNameExtractor.ExtractPartName(propertyInfo);
var childPart = new FieldSelectorPart(partName);
var nextType = propertyInfo.PropertyType;
if (!nextType.IsPrimitive())
{
if (propertyInfo.PropertyType.IsIEnumerable() && !propertyInfo.PropertyType.IsPrimitive())
{
nextType = propertyInfo.PropertyType.GetSingleGenericParameter();
}
foreach (var childPartOfChildPart in this.GenerateChildTreeFromProperties(nextType.GetProperties(), currentDeep + 1, maximumDeep))
{
childPart.AddPart(childPartOfChildPart);
}
}
yield return(childPart);
}
}
public FieldSelectorTree GenerateFromLambdaExpression <TProperty>([NotNull] Expression <Func <TRoot, TProperty> > selector)
{
if (selector == null)
{
throw new ArgumentNullException(nameof(selector));
}
this.rootPart = new FieldSelectorTree();
this.Visit(selector);
FieldSelectorPart addCurrentToMe = null;
foreach (var childPart in this.fieldSelectorParts)
{
if (!this.rootPart.ChildParts.Any())
{
addCurrentToMe = childPart;
this.rootPart.AddPart(childPart);
}
else if (addCurrentToMe != null)
{
addCurrentToMe.AddPart(childPart);
addCurrentToMe = childPart;
}
}
var result = this.rootPart;
this.rootPart = null;
return(result);
}
private IEnumerable <FieldSelectorPart> MergeChildPart([NotNull] IEnumerable <IGrouping <String, FieldSelectorPart> > groupedPart)
{
if (groupedPart == null)
{
throw new ArgumentNullException(nameof(groupedPart));
}
foreach (var group in groupedPart)
{
var mergedChildPart = new FieldSelectorPart(group.Key);
foreach (var childPart in this.MergeChildPart(group.SelectMany(m => m.ChildParts).GroupBy(m => m.PartName)))
{
mergedChildPart.AddPart(childPart);
}
yield return(mergedChildPart);
}
}
private FieldSelectorTree MergeRootParts([NotNull] IEnumerable <FieldSelectorTree> rootParts)
{
if (rootParts == null)
{
throw new ArgumentNullException(nameof(rootParts));
}
var result = new FieldSelectorTree();
foreach (var firstLevel in rootParts.SelectMany(m => m.ChildParts).GroupBy(m => m.PartName))
{
var childgroup = new FieldSelectorPart(firstLevel.Key);
foreach (var part in this.MergeChildPart(firstLevel.SelectMany(m => m.ChildParts).GroupBy(m => m.PartName)))
{
childgroup.AddPart(part);
}
result.AddPart(childgroup);
}
return(result);
}