/// <summary>Creates array at current writer level.</summary>
public static void SerializeTo(this IEnumerable obj, string elementName, ITreeWriter writer)
{
// Write start element tag
writer.WriteStartArrayElement(elementName);
// Iterate over sequence elements
foreach (var item in obj)
{
// Write array item start tag
writer.WriteStartArrayItem();
// Serialize based on type of the item
switch (item)
{
case null:
case string stringItem:
case double doubleItem:
case bool boolItem:
case int intItem:
case long longItem:
// Write item as is for these types
writer.WriteStartValue();
writer.WriteValue(item);
writer.WriteEndValue();
break;
case IEnumerable enumerableItem:
throw new Exception($"Serialization is not supported for element {elementName} " +
$"which is collection containing another collection.");
case Data dataItem:
if (dataItem is Key)
{
// Write key as serialized delimited string
writer.WriteStartValue();
writer.WriteValue(dataItem.AsString());
writer.WriteEndValue();
}
else
{
// Embedded data element
dataItem.SerializeTo(writer);
}
break;
default:
// Argument type is unsupported, error message
throw new Exception(
$"Element type {item.GetType()} is not supported for tree serialization.");
}
// Write array item end tag
writer.WriteEndArrayItem();
}
// Write matching end element tag
writer.WriteEndArrayElement(elementName);
}
/// <summary>Write an array item with no inner nodes.
/// Element type is inferred by calling obj.GetType().</summary>
public static void WriteValueArrayItem(this ITreeWriter obj, object value)
{
// Writes null or empty value as BSON null
obj.WriteStartArrayItem();
obj.WriteStartValue();
obj.WriteValue(value);
obj.WriteEndValue();
obj.WriteEndArrayItem();
}
/// <summary>Write a single array item.</summary>
public static void WriteArrayItem(this ITreeWriter obj, object value)
{
// Will serialize null or empty value
obj.WriteStartArrayItem();
obj.WriteStartValue();
obj.WriteValue(value);
obj.WriteEndValue();
obj.WriteEndArrayItem();
}
/// <summary>WriteStartArrayItem(...) followed by WriteStartDict().</summary>
public static void WriteStartDictArrayItem(this ITreeWriter obj)
{
obj.WriteStartArrayItem();
obj.WriteStartDict();
}