public static ByteBuffer ToByteBuffer(IFeature feature, ref Header header)
{
var builder = new FlatBufferBuilder(1024);
GeometryType geometryType;
if (header.GeometryType != GeometryType.Unknown)
{
geometryType = header.GeometryType;
}
else
{
geometryType = GeometryConversions.ToGeometryType(feature.Geometry);
}
var go = GeometryConversions.BuildGeometry(builder, feature.Geometry, geometryType, ref header);
var memoryStream = new MemoryStream();
if (feature.Attributes != null && feature.Attributes.Count > 0 && header.ColumnsLength > 0)
{
var writer = new BinaryWriter(memoryStream, Encoding.UTF8);
for (ushort i = 0; i < header.ColumnsLength; i++)
{
var column = header.Columns(i).Value;
var type = column.Type;
var name = column.Name;
if (!feature.Attributes.Exists(name))
{
continue;
}
var value = feature.Attributes[name];
if (value is null)
{
continue;
}
writer.Write(i);
switch (type)
{
case ColumnType.Bool:
writer.Write((bool)value);
break;
case ColumnType.Int:
writer.Write((int)value);
break;
case ColumnType.Long:
writer.Write((long)value);
break;
case ColumnType.Double:
writer.Write((double)value);
break;
case ColumnType.String:
var bytes = Encoding.UTF8.GetBytes((string)value);
writer.Write(bytes.Length);
writer.Write(bytes);
break;
default:
throw new ApplicationException("Unknown type " + value.GetType().FullName);
}
}
}
var propertiesOffset = default(VectorOffset);
if (memoryStream.Position > 0)
{
propertiesOffset = Feature.CreatePropertiesVectorBlock(builder, memoryStream.ToArray());
}
Offset <Geometry> geometryOffset;
if (go.gos != null && go.gos.Length > 0)
{
var partOffsets = new Offset <Geometry> [go.gos.Length];
for (int i = 0; i < go.gos.Length; i++)
{
var goPart = go.gos[i];
var partOffset = Geometry.CreateGeometry(builder, goPart.endsOffset, goPart.xyOffset, goPart.zOffset, goPart.mOffset, default, default, go.Type, default);
public static byte[] ToByteBuffer(IFeature feature, IList <LayerMeta> layers)
{
// TODO: size might not be enough, need to be adaptive
var builder = new FlatBufferBuilder(1024);
// TODO: improve layer introspection
var layer = layers.First(l => l.GeometryType == GeometryConversions.ToGeometryType(feature.Geometry));
var layerIndex = (uint)layers.IndexOf(layer);
var columns = layer.Columns;
var geometryOffset = GeometryConversions.BuildGeometry(builder, feature.Geometry);
VectorOffset?valuesOffset = null;
if (feature.Attributes != null && feature.Attributes.Count > 0 && columns != null)
{
var valueOffsets = new List <Offset <Value> >();
foreach (var column in columns)
{
if (feature.Attributes.Exists(column.Name))
{
ushort columnIndex = (ushort)columns.IndexOf(column);
var value = feature.Attributes[column.Name];
switch (value)
{
case bool v:
valueOffsets.Add(Value.CreateValue(builder, columnIndex, bool_value: v));
break;
case int v:
valueOffsets.Add(Value.CreateValue(builder, columnIndex, int_value: v));
break;
case long v:
valueOffsets.Add(Value.CreateValue(builder, columnIndex, long_value: v));
break;
case double v:
valueOffsets.Add(Value.CreateValue(builder, columnIndex, double_value: v));
break;
case string v:
valueOffsets.Add(Value.CreateValue(builder, columnIndex, string_valueOffset: builder.CreateString(v)));
break;
case null:
break;
default: throw new ApplicationException("Unknown type");
}
}
}
valuesOffset = Feature.CreateValuesVector(builder, valueOffsets.ToArray());
}
Feature.StartFeature(builder);
Feature.AddGeometry(builder, geometryOffset);
Feature.AddLayer(builder, layerIndex);
if (valuesOffset.HasValue)
{
Feature.AddValues(builder, valuesOffset.Value);
}
var offset = Feature.EndFeature(builder);
builder.FinishSizePrefixed(offset.Value);
var bytes = builder.DataBuffer.ToSizedArray();
return(bytes);
}
public static byte[] ToByteBuffer(IFeature feature, GeometryType geometryType, byte dimensions, IList <ColumnMeta> columns)
{
var builder = new FlatBufferBuilder(4096);
var go = GeometryConversions.BuildGeometry(builder, feature.Geometry, geometryType, dimensions);
var memoryStream = new MemoryStream();
if (feature.Attributes != null && feature.Attributes.Count > 0 && columns != null)
{
var writer = new BinaryWriter(memoryStream, Encoding.UTF8);
for (ushort i = 0; i < columns.Count(); i++)
{
var column = columns[i];
var type = column.Type;
var name = column.Name;
if (!feature.Attributes.Exists(name))
{
continue;
}
var value = feature.Attributes[name];
if (value is null)
{
continue;
}
writer.Write(i);
switch (type)
{
case ColumnType.Bool:
writer.Write((bool)value);
break;
case ColumnType.Int:
writer.Write((int)value);
break;
case ColumnType.Long:
writer.Write((long)value);
break;
case ColumnType.Double:
writer.Write((double)value);
break;
case ColumnType.String:
var bytes = Encoding.UTF8.GetBytes((string)value);
writer.Write(bytes.Length);
writer.Write(bytes);
break;
default:
throw new ApplicationException("Unknown type " + value.GetType().FullName);
}
}
}
var propertiesOffset = default(VectorOffset);
if (memoryStream.Position > 0)
{
propertiesOffset = Feature.CreatePropertiesVector(builder, memoryStream.ToArray());
}
var geometryOffset = default(Offset <Geometry>);
if (go.gos != null && go.gos.Length > 0)
{
var partOffsets = new Offset <Geometry> [go.gos.Length];
for (int i = 0; i < go.gos.Length; i++)
{
var goPart = go.gos[i];
var partOffset = Geometry.CreateGeometry(builder, goPart.endsOffset, goPart.coordsOffset, default(VectorOffset), default(VectorOffset), default(VectorOffset), default(VectorOffset), go.type, default(VectorOffset));
partOffsets[i] = partOffset;
}
var partsOffset = Geometry.CreatePartsVector(builder, partOffsets);
geometryOffset = Geometry.CreateGeometry(builder, default(VectorOffset), default(VectorOffset), default(VectorOffset), default(VectorOffset), default(VectorOffset), default(VectorOffset), go.type, partsOffset);
}
else
{
geometryOffset = Geometry.CreateGeometry(builder, go.endsOffset, go.coordsOffset, default(VectorOffset), default(VectorOffset), default(VectorOffset), default(VectorOffset), go.type, default(VectorOffset));
}
Feature.StartFeature(builder);
Feature.AddGeometry(builder, geometryOffset);
Feature.AddProperties(builder, propertiesOffset);
var featureOffset = Feature.EndFeature(builder);
builder.FinishSizePrefixed(featureOffset.Value);
return(builder.DataBuffer.ToSizedArray());
}
