public static bool TryRead(
BlittableJsonTraverser blittableJsonTraverser,
BlittableJsonReaderObject document,
StringSegment path,
out object value)
{
if (blittableJsonTraverser.TryRead(document, path, out value, out StringSegment leftPath) &&
leftPath.Length == 0)
{
value = TypeConverter.ConvertForIndexing(value);
return(true);
}
if (value == null)
{
return(false);
}
return(TryReadComputedProperties(blittableJsonTraverser, leftPath, ref value));
}
public static bool TryReadComputedProperties(BlittableJsonTraverser blittableJsonTraverser, StringSegment leftPath, ref object value)
{
value = TypeConverter.ConvertForIndexing(value);
if (leftPath == "Length" || leftPath == "length" ||
leftPath == "Count" || leftPath == "count")
{
if (value is LazyStringValue lazyStringValue)
{
value = lazyStringValue.Size;
return(true);
}
if (value is string s)
{
value = s.Length;
return(true);
}
if (value is LazyCompressedStringValue lazyCompressedStringValue)
{
value = lazyCompressedStringValue.UncompressedSize;
return(true);
}
var array = value as BlittableJsonReaderArray;
if (array != null)
{
value = array.Length;
return(true);
}
if (value is BlittableJsonReaderObject json)
{
value = json.Count;
return(true);
}
if (value is Array a)
{
value = a.Length;
return(true);
}
if (value is List <object> l)
{
value = l.Count;
return(true);
}
value = null;
return(false);
}
if (value is BlittableJsonReaderObject obj) // dictionary key e.g. .Where(x => x.Events.Any(y => y.Key.In(dates)))
{
var isKey = leftPath == "Key";
if (isKey || leftPath == "Value")
{
var index = 0;
var property = new BlittableJsonReaderObject.PropertyDetails();
var values = new object[obj.Count];
for (int i = 0; i < obj.Count; i++)
{
obj.GetPropertyByIndex(i, ref property);
var val = isKey ? property.Name : property.Value;
values[index++] = TypeConverter.ConvertForIndexing(val);
}
value = values;
return(true);
}
if (TryRead(blittableJsonTraverser, obj, leftPath, out value))
{
return(true);
}
}
if (value is DateTime || value is DateTimeOffset || value is TimeSpan)
{
int indexOfPropertySeparator;
do
{
indexOfPropertySeparator = leftPath.IndexOfAny(BlittableJsonTraverser.PropertySeparators, 0);
if (indexOfPropertySeparator != -1)
{
leftPath = leftPath.Subsegment(0, indexOfPropertySeparator);
}
var accessor = TypeConverter.GetPropertyAccessor(value);
value = accessor.GetValue(leftPath.Value, value);
if (value == null)
{
return(false);
}
} while (indexOfPropertySeparator != -1);
return(true);
}
if (value is string == false &&
value is IEnumerable items)
{
value = ReadNestedComputed(blittableJsonTraverser, items, leftPath);
return(true);
}
value = null;
return(false);
}
