public static IFeature FromByteBuffer(ByteBuffer bb, GeometryType geometryType, byte dimensions, IList <ColumnMeta> columns = null)
{
var feature = Feature.GetRootAsFeature(bb);
IAttributesTable attributesTable = null;
var propertiesArray = feature.GetPropertiesArray();
if (propertiesArray != null && propertiesArray.Length > 0)
{
var memoryStream = new MemoryStream(propertiesArray);
var reader = new BinaryReader(memoryStream);
attributesTable = new AttributesTable();
while (memoryStream.Position < memoryStream.Length)
{
ushort i = reader.ReadUInt16();
var column = columns[i];
var type = column.Type;
var name = column.Name;
switch (type)
{
case ColumnType.Bool:
attributesTable.AddAttribute(name, reader.ReadBoolean());
break;
case ColumnType.Int:
attributesTable.AddAttribute(name, reader.ReadInt32());
break;
case ColumnType.Long:
attributesTable.AddAttribute(name, reader.ReadInt64());
break;
case ColumnType.Double:
attributesTable.AddAttribute(name, reader.ReadDouble());
break;
case ColumnType.String:
int len = reader.ReadInt32();
var str = Encoding.UTF8.GetString(memoryStream.ToArray(), (int)memoryStream.Position, len);
memoryStream.Position += len;
attributesTable.AddAttribute(name, str);
break;
default: throw new ApplicationException("Unknown type");
}
}
}
IGeometry geometry = null;
if (feature.Geometry.HasValue)
{
geometry = GeometryConversions.FromFlatbuf(feature.Geometry.Value, geometryType);
}
var f = new NetTopologySuite.Features.Feature(geometry, attributesTable);
return(f);
}
public static IFeature FromByteBuffer(ByteBuffer bb, Header header)
{
// TODO: introspect which layer
var columnsLayer = header.Layers(0).Value;
IList <Column> columns = null;
if (columnsLayer.ColumnsLength > 0)
{
columns = new List <Column>();
for (int i = 0; i < columnsLayer.ColumnsLength; i++)
{
var column = columnsLayer.Columns(i).Value;
columns.Add(column);
}
}
var feature = Feature.GetRootAsFeature(bb);
IAttributesTable attributesTable = null;
if (feature.ValuesLength > 0)
{
attributesTable = new AttributesTable();
}
var layer = header.Layers((int)feature.Layer).Value;
for (int i = 0; i < feature.ValuesLength; i++)
{
var value = feature.Values(i).Value;
var column = columns[value.ColumnIndex];
switch (column.Type)
{
case ColumnType.Bool:
attributesTable.AddAttribute(column.Name, value.BoolValue);
break;
case ColumnType.Int:
attributesTable.AddAttribute(column.Name, value.IntValue);
break;
case ColumnType.Long:
attributesTable.AddAttribute(column.Name, value.LongValue);
break;
case ColumnType.Double:
attributesTable.AddAttribute(column.Name, value.DoubleValue);
break;
case ColumnType.String:
attributesTable.AddAttribute(column.Name, value.StringValue);
break;
default: throw new ApplicationException("Unknown type");
}
}
var geometry = GeometryConversions.FromFlatbuf(feature.Geometry.Value, layer.GeometryType, layer.Dimensions);
var f = new NetTopologySuite.Features.Feature(geometry, attributesTable);
return(f);
}
