async ValueTask <PostgisGeometry> DoRead(NpgsqlReadBuffer buf, WkbIdentifier id, bool le, bool async, CancellationToken cancellationToken = default)
{
switch (id)
{
case WkbIdentifier.Point:
await buf.Ensure(16, async, cancellationToken);
return(new PostgisPoint(buf.ReadDouble(le), buf.ReadDouble(le)));
case WkbIdentifier.LineString:
{
await buf.Ensure(4, async, cancellationToken);
var points = new Coordinate2D[buf.ReadInt32(le)];
for (var ipts = 0; ipts < points.Length; ipts++)
{
await buf.Ensure(16, async, cancellationToken);
points[ipts] = new Coordinate2D(buf.ReadDouble(le), buf.ReadDouble(le));
}
return(new PostgisLineString(points));
}
case WkbIdentifier.Polygon:
{
await buf.Ensure(4, async, cancellationToken);
var rings = new Coordinate2D[buf.ReadInt32(le)][];
for (var irng = 0; irng < rings.Length; irng++)
{
await buf.Ensure(4, async, cancellationToken);
rings[irng] = new Coordinate2D[buf.ReadInt32(le)];
for (var ipts = 0; ipts < rings[irng].Length; ipts++)
{
await buf.Ensure(16, async, cancellationToken);
rings[irng][ipts] = new Coordinate2D(buf.ReadDouble(le), buf.ReadDouble(le));
}
}
return(new PostgisPolygon(rings));
}
case WkbIdentifier.MultiPoint:
{
await buf.Ensure(4, async, cancellationToken);
var points = new Coordinate2D[buf.ReadInt32(le)];
for (var ipts = 0; ipts < points.Length; ipts++)
{
await buf.Ensure(21, async, cancellationToken);
await buf.Skip(5, async, cancellationToken);
points[ipts] = new Coordinate2D(buf.ReadDouble(le), buf.ReadDouble(le));
}
return(new PostgisMultiPoint(points));
}
case WkbIdentifier.MultiLineString:
{
await buf.Ensure(4, async, cancellationToken);
var rings = new Coordinate2D[buf.ReadInt32(le)][];
for (var irng = 0; irng < rings.Length; irng++)
{
await buf.Ensure(9, async, cancellationToken);
await buf.Skip(5, async, cancellationToken);
rings[irng] = new Coordinate2D[buf.ReadInt32(le)];
for (var ipts = 0; ipts < rings[irng].Length; ipts++)
{
await buf.Ensure(16, async, cancellationToken);
rings[irng][ipts] = new Coordinate2D(buf.ReadDouble(le), buf.ReadDouble(le));
}
}
return(new PostgisMultiLineString(rings));
}
case WkbIdentifier.MultiPolygon:
{
await buf.Ensure(4, async, cancellationToken);
var pols = new Coordinate2D[buf.ReadInt32(le)][][];
for (var ipol = 0; ipol < pols.Length; ipol++)
{
await buf.Ensure(9, async, cancellationToken);
await buf.Skip(5, async, cancellationToken);
pols[ipol] = new Coordinate2D[buf.ReadInt32(le)][];
for (var irng = 0; irng < pols[ipol].Length; irng++)
{
await buf.Ensure(4, async, cancellationToken);
pols[ipol][irng] = new Coordinate2D[buf.ReadInt32(le)];
for (var ipts = 0; ipts < pols[ipol][irng].Length; ipts++)
{
await buf.Ensure(16, async, cancellationToken);
pols[ipol][irng][ipts] = new Coordinate2D(buf.ReadDouble(le), buf.ReadDouble(le));
}
}
}
return(new PostgisMultiPolygon(pols));
}
case WkbIdentifier.GeometryCollection:
{
await buf.Ensure(4, async, cancellationToken);
var g = new PostgisGeometry[buf.ReadInt32(le)];
for (var i = 0; i < g.Length; i++)
{
await buf.Ensure(5, async, cancellationToken);
var elemLe = buf.ReadByte() != 0;
var elemId = (WkbIdentifier)(buf.ReadUInt32(le) & 7);
g[i] = await DoRead(buf, elemId, elemLe, async, cancellationToken);
}
return(new PostgisGeometryCollection(g));
}
default:
throw new InvalidOperationException("Unknown Postgis identifier.");
}
}
public PostgisPoint(double x, double y)
{
_coord = new Coordinate2D(x, y);
}