public override async Task Write(PostgisGeometry value, NpgsqlWriteBuffer buf, NpgsqlLengthCache?lengthCache, NpgsqlParameter?parameter, bool async, CancellationToken cancellationToken = default)
{
// Common header
if (value.SRID == 0)
{
if (buf.WriteSpaceLeft < 5)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteByte(0); // We choose to ouput only XDR structure
buf.WriteInt32((int)value.Identifier);
}
else
{
if (buf.WriteSpaceLeft < 9)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteByte(0);
buf.WriteInt32((int)((uint)value.Identifier | (uint)EwkbModifiers.HasSRID));
buf.WriteInt32((int)value.SRID);
}
switch (value.Identifier)
{
case WkbIdentifier.Point:
if (buf.WriteSpaceLeft < 16)
{
await buf.Flush(async, cancellationToken);
}
var p = (PostgisPoint)value;
buf.WriteDouble(p.X);
buf.WriteDouble(p.Y);
return;
case WkbIdentifier.LineString:
var l = (PostgisLineString)value;
if (buf.WriteSpaceLeft < 4)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteInt32(l.PointCount);
for (var ipts = 0; ipts < l.PointCount; ipts++)
{
if (buf.WriteSpaceLeft < 16)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteDouble(l[ipts].X);
buf.WriteDouble(l[ipts].Y);
}
return;
case WkbIdentifier.Polygon:
var pol = (PostgisPolygon)value;
if (buf.WriteSpaceLeft < 4)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteInt32(pol.RingCount);
for (var irng = 0; irng < pol.RingCount; irng++)
{
if (buf.WriteSpaceLeft < 4)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteInt32(pol[irng].Length);
for (var ipts = 0; ipts < pol[irng].Length; ipts++)
{
if (buf.WriteSpaceLeft < 16)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteDouble(pol[irng][ipts].X);
buf.WriteDouble(pol[irng][ipts].Y);
}
}
return;
case WkbIdentifier.MultiPoint:
var mp = (PostgisMultiPoint)value;
if (buf.WriteSpaceLeft < 4)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteInt32(mp.PointCount);
for (var ipts = 0; ipts < mp.PointCount; ipts++)
{
if (buf.WriteSpaceLeft < 21)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteByte(0);
buf.WriteInt32((int)WkbIdentifier.Point);
buf.WriteDouble(mp[ipts].X);
buf.WriteDouble(mp[ipts].Y);
}
return;
case WkbIdentifier.MultiLineString:
var ml = (PostgisMultiLineString)value;
if (buf.WriteSpaceLeft < 4)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteInt32(ml.LineCount);
for (var irng = 0; irng < ml.LineCount; irng++)
{
if (buf.WriteSpaceLeft < 9)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteByte(0);
buf.WriteInt32((int)WkbIdentifier.LineString);
buf.WriteInt32(ml[irng].PointCount);
for (var ipts = 0; ipts < ml[irng].PointCount; ipts++)
{
if (buf.WriteSpaceLeft < 16)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteDouble(ml[irng][ipts].X);
buf.WriteDouble(ml[irng][ipts].Y);
}
}
return;
case WkbIdentifier.MultiPolygon:
var mpl = (PostgisMultiPolygon)value;
if (buf.WriteSpaceLeft < 4)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteInt32(mpl.PolygonCount);
for (var ipol = 0; ipol < mpl.PolygonCount; ipol++)
{
if (buf.WriteSpaceLeft < 9)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteByte(0);
buf.WriteInt32((int)WkbIdentifier.Polygon);
buf.WriteInt32(mpl[ipol].RingCount);
for (var irng = 0; irng < mpl[ipol].RingCount; irng++)
{
if (buf.WriteSpaceLeft < 4)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteInt32(mpl[ipol][irng].Length);
for (var ipts = 0; ipts < mpl[ipol][irng].Length; ipts++)
{
if (buf.WriteSpaceLeft < 16)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteDouble(mpl[ipol][irng][ipts].X);
buf.WriteDouble(mpl[ipol][irng][ipts].Y);
}
}
}
return;
case WkbIdentifier.GeometryCollection:
var coll = (PostgisGeometryCollection)value;
if (buf.WriteSpaceLeft < 4)
{
await buf.Flush(async, cancellationToken);
}
buf.WriteInt32(coll.GeometryCount);
foreach (var x in coll)
{
await Write(x, buf, lengthCache, null, async, cancellationToken);
}
return;
default:
throw new InvalidOperationException("Unknown Postgis identifier.");
}
}
/// <inheritdoc />
public override void Write(NpgsqlLine value, NpgsqlWriteBuffer buf, NpgsqlParameter?parameter)
{
buf.WriteDouble(value.A);
buf.WriteDouble(value.B);
buf.WriteDouble(value.C);
}
/// <inheritdoc />
public override void Write(NpgsqlCircle value, NpgsqlWriteBuffer buf, NpgsqlParameter?parameter)
{
buf.WriteDouble(value.X);
buf.WriteDouble(value.Y);
buf.WriteDouble(value.Radius);
}
/// <inheritdoc />
public override void Write(NpgsqlPoint value, NpgsqlWriteBuffer buf, NpgsqlParameter?parameter)
{
buf.WriteDouble(value.X);
buf.WriteDouble(value.Y);
}
public override void Write(double value, NpgsqlWriteBuffer buf, NpgsqlParameter parameter) => buf.WriteDouble(value);