private static List <Schema.Node> GetSchemaNode(Schema.Node node)
{
var schemaNodes = new List <Schema.Node>();
for (var n = node; n != null; n = n.Parent)
{
schemaNodes.Add(n);
}
schemaNodes.RemoveAt(schemaNodes.Count - 1); // we don't need the schema root
schemaNodes.Reverse(); // root to leaf
return(schemaNodes);
}
private static (short nestingDepth, short[] nullDefinitionLevels) GetArraySchemaInfo(Type elementType, Schema.Node node, int maxRepetitionLevel)
{
var schemaNodes = new List <Schema.Node>();
for (; node != null; node = node.Parent)
{
schemaNodes.Add(node);
}
schemaNodes.RemoveAt(schemaNodes.Count - 1); // we don't need the schema root
schemaNodes.Reverse(); // root to leaf
var nestingDepth = schemaNodes.Count(n => n.LogicalType == LogicalType.List);
var nullDefinitionLevels = new short[nestingDepth + 1];
int nestingLevel = 0;
// By default mark every level as required.
for (int i = 0; i < nullDefinitionLevels.Length; i++)
{
nullDefinitionLevels[i] = -1;
}
for (int i = 0; i < schemaNodes.Count; i++)
{
if (schemaNodes[i].Repetition == Repetition.Optional)
{
nullDefinitionLevels[nestingLevel++] = (short)i;
}
}
// Check the type matches
var maxRepLevel = maxRepetitionLevel;
var depth = 0;
for (var type = elementType; type != typeof(byte[]) && type.IsArray; type = type.GetElementType())
{
depth++;
}
if (nestingDepth != depth || depth != maxRepLevel)
{
throw new Exception("Schema does not match type we are trying to read into.");
}
return(checked ((short)nestingDepth), nullDefinitionLevels);
}