/**
* Reads a coordinate value with the specified dimensionality. Makes the X and Y ordinates precise
* according to the precision model in use.
*/
private void readCoordinate() throws IOException {
for (int i = 0; i < inputDimension; i++) {
if (i <= 1) {
ordValues[i] = precisionModel.makePrecise(dis.readDouble());
} else {
ordValues[i] = dis.readDouble();
}
}
}
private GeometryCollection readGeometryCollection() throws IOException, ParseException {
int numGeom = dis.readInt();
Geometry[] geoms = new Geometry[numGeom];
for (int i = 0; i < numGeom; i++) {
geoms[i] = readGeometry();
}
return factory.createGeometryCollection(geoms);
}
private MultiPoint readMultiPoint() throws IOException, ParseException {
int numGeom = dis.readInt();
Point[] geoms = new Point[numGeom];
for (int i = 0; i < numGeom; i++) {
Geometry g = readGeometry();
if (!(g instanceof Point)) throw new ParseException(INVALID_GEOM_TYPE_MSG + "MultiPoint");
geoms[i] = (Point) g;
}
return factory.createMultiPoint(geoms);
}
private MultiLineString readMultiLineString() throws IOException, ParseException {
int numGeom = dis.readInt();
LineString[] geoms = new LineString[numGeom];
for (int i = 0; i < numGeom; i++) {
Geometry g = readGeometry();
if (!(g instanceof LineString))
throw new ParseException(INVALID_GEOM_TYPE_MSG + "MultiLineString");
geoms[i] = (LineString) g;
}
return factory.createMultiLineString(geoms);
}
private Polygon readPolygon() throws IOException {
int numRings = dis.readInt();
LinearRing[] holes = null;
if (numRings > 1) holes = new LinearRing[numRings - 1];
LinearRing shell = readLinearRing();
for (int i = 0; i < numRings - 1; i++) {
holes[i] = readLinearRing();
}
return factory.createPolygon(shell, holes);
}
private LinearRing readLinearRing() throws IOException {
int size = dis.readInt();
CoordinateSequence pts = readCoordinateSequenceRing(size);
return factory.createLinearRing(pts);
}
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;
}
/**
* Reads a {@link Geometry} in binary WKB format from an {@link InStream}.
*
* @param is the stream to read from
* @return the Geometry read
* @throws IOException if the underlying stream creates an error
* @throws ParseException if the WKB is ill-formed
*/
public Geometry read(InStream is) throws IOException, ParseException {
dis.setInStream(is);
Geometry g = readGeometry();
return g;
}