private Geometry parseMultiPolygon(int dimension, CoordinateReferenceSystem crs)
throws XmlPullParserException, IOException, NoSuchAuthorityCodeException, FactoryException {
parser.require(START_TAG, GML.NAMESPACE, GML.MultiPolygon.getLocalPart());
Geometry geom;
List<Polygon> polygons = new ArrayList<Polygon>(2);
parser.nextTag();
while (true) {
parser.require(START_TAG, GML.NAMESPACE, GML.polygonMember.getLocalPart());
parser.nextTag();
parser.require(START_TAG, GML.NAMESPACE, GML.Polygon.getLocalPart());
Polygon p = parsePolygon(dimension, crs);
polygons.add(p);
parser.nextTag();
parser.require(END_TAG, GML.NAMESPACE, GML.polygonMember.getLocalPart());
parser.nextTag();
if (END_TAG == parser.getEventType()
&& GML.MultiPolygon.getLocalPart().equals(parser.getName())) {
// we're done
break;
}
}
parser.require(END_TAG, GML.NAMESPACE, GML.MultiPolygon.getLocalPart());
geom = geomFac.createMultiPolygon(polygons.toArray(new Polygon[polygons.size()]));
return geom;
}
/**
* Parses a polygon.
*
* <p>Precondition: parser positioned at a {@link GML#Polygon Polygon} start tag
*
* <p>Postcondition: parser positioned at the {@link GML#Polygon Polygon} end tag of the starting
* tag
*
* @param dimension
* @param crs
* @return
* @throws XmlPullParserException
* @throws IOException
* @throws NoSuchAuthorityCodeException
* @throws FactoryException
*/
private Polygon parsePolygon(int dimension, CoordinateReferenceSystem crs)
throws XmlPullParserException, IOException, NoSuchAuthorityCodeException, FactoryException {
Polygon geom;
LinearRing shell;
List<LinearRing> holes = null;
parser.nextTag();
parser.require(START_TAG, GML.NAMESPACE, null);
QName name = new QName(parser.getNamespace(), parser.getName());
if (GML.exterior.equals(name)) {
parser.nextTag();
shell = parseLinearRing(dimension, crs);
parser.nextTag();
parser.require(END_TAG, GML.NAMESPACE, GML.exterior.getLocalPart());
} else if (GML.outerBoundaryIs.equals(name)) {
parser.nextTag();
parser.require(START_TAG, GML.NAMESPACE, GML.LinearRing.getLocalPart());
shell = parseLinearRing(dimension, crs);
parser.nextTag();
parser.require(END_TAG, GML.NAMESPACE, GML.outerBoundaryIs.getLocalPart());
} else {
throw new IllegalStateException("Unknown polygon boundary element: " + name);
}
parser.nextTag();
name = new QName(parser.getNamespace(), parser.getName());
if (START_TAG == parser.getEventType()) {
if (GML.interior.equals(name) || GML.innerBoundaryIs.equals(name)) {
// parse interior rings
holes = new ArrayList<LinearRing>(2);
while (true) {
parser.require(START_TAG, GML.NAMESPACE, name.getLocalPart());
parser.nextTag();
parser.require(START_TAG, GML.NAMESPACE, GML.LinearRing.getLocalPart());
LinearRing hole = parseLinearRing(dimension, crs);
parser.require(END_TAG, GML.NAMESPACE, GML.LinearRing.getLocalPart());
holes.add(hole);
parser.nextTag();
parser.require(END_TAG, GML.NAMESPACE, name.getLocalPart());
parser.nextTag();
if (END_TAG == parser.getEventType()) {
// we're done
parser.require(END_TAG, GML.NAMESPACE, GML.Polygon.getLocalPart());
break;
}
}
}
}
parser.require(END_TAG, GML.NAMESPACE, GML.Polygon.getLocalPart());
LinearRing[] holesArray = null;
if (holes != null) {
holesArray = holes.toArray(new LinearRing[holes.size()]);
}
geom = geomFac.createPolygon(shell, holesArray);
geom.setUserData(crs);
return geom;
}