private Geometry readGeometry() throws IOException, ParseException {
// determine byte order
byte byteOrderWKB = dis.readByte();
// always set byte order, since it may change from geometry to geometry
if (byteOrderWKB == WKBConstants.wkbNDR) {
dis.setOrder(ByteOrderValues.LITTLE_ENDIAN);
} else if (byteOrderWKB == WKBConstants.wkbXDR) {
dis.setOrder(ByteOrderValues.BIG_ENDIAN);
} else if (isStrict) {
throw new ParseException("Unknown geometry byte order (not NDR or XDR): " + byteOrderWKB);
}
// if not strict and not XDR or NDR, then we just use the dis default set at the
// start of the geometry (if a multi-geometry). This allows WBKReader to work
// with Spatialite native BLOB WKB, as well as other WKB variants that might just
// specify endian-ness at the start of the multigeometry.
int typeInt = dis.readInt();
int geometryType = typeInt & 0xff;
// determine if Z values are present
boolean hasZ = (typeInt & 0x80000000) != 0;
inputDimension = hasZ ? 3 : 2;
// determine if SRIDs are present
hasSRID = (typeInt & 0x20000000) != 0;
int SRID = 0;
if (hasSRID) {
SRID = dis.readInt();
}
// only allocate ordValues buffer if necessary
if (ordValues == null || ordValues.length < inputDimension)
ordValues = new double[inputDimension];
Geometry geom = null;
switch (geometryType) {
case WKBConstants.wkbPoint:
geom = readPoint();
break;
case WKBConstants.wkbLineString:
geom = readLineString();
break;
case WKBConstants.wkbPolygon:
geom = readPolygon();
break;
case WKBConstants.wkbMultiPoint:
geom = readMultiPoint();
break;
case WKBConstants.wkbMultiLineString:
geom = readMultiLineString();
break;
case WKBConstants.wkbMultiPolygon:
geom = readMultiPolygon();
break;
case WKBConstants.wkbGeometryCollection:
geom = readGeometryCollection();
break;
default:
throw new ParseException("Unknown WKB type " + geometryType);
}
setSRID(geom, SRID);
return geom;
}
