/**
* return a single geometry collection <br>
* result.GeometryN(i) = the i-th feature in the FeatureCollection<br>
* All the geometry types will be the same type (ie. all polygons) - or they will be set to<br>
* NULL geometries<br>
* <br>
* GeometryN(i) = {Multipoint,Multilinestring, or Multipolygon)<br>
*
* @param fc feature collection to make homogeneous
*/
public GeometryCollection makeSHAPEGeometryCollection(FeatureCollection fc) throws Exception {
GeometryCollection result;
Geometry[] allGeoms = new Geometry[fc.size()];
int geomtype = findBestGeometryType(fc);
if (geomtype == 0) {
throw new Exception(
"Could not determine shapefile type - data is either all GeometryCollections or empty");
}
List features = fc.getFeatures();
for (int t = 0; t < features.size(); t++) {
Geometry geom;
geom = ((Feature) features.get(t)).getGeometry();
switch (geomtype) {
case 1: // point
if ((geom instanceof Point)) {
// good!
Point[] p = new Point[1];
p[0] = (Point) geom;
allGeoms[t] = new MultiPoint(p, new PrecisionModel(), 0);
} else if (geom instanceof MultiPoint) {
allGeoms[t] = geom;
} else {
allGeoms[t] = new MultiPoint(null, new PrecisionModel(), 0);
}
break;
case 2: // line
if ((geom instanceof LineString)) {
LineString[] l = new LineString[1];
l[0] = (LineString) geom;
allGeoms[t] = new MultiLineString(l, new PrecisionModel(), 0);
} else if (geom instanceof MultiLineString) {
allGeoms[t] = geom;
} else {
allGeoms[t] = new MultiLineString(null, new PrecisionModel(), 0);
}
break;
case 3: // polygon
if (geom instanceof Polygon) {
// good!
Polygon[] p = new Polygon[1];
p[0] = (Polygon) geom;
allGeoms[t] = makeGoodSHAPEMultiPolygon(new MultiPolygon(p, new PrecisionModel(), 0));
} else if (geom instanceof MultiPolygon) {
allGeoms[t] = makeGoodSHAPEMultiPolygon((MultiPolygon) geom);
} else {
allGeoms[t] = new MultiPolygon(null, new PrecisionModel(), 0);
}
break;
}
}
result = new GeometryCollection(allGeoms, new PrecisionModel(), 0);
return result;
}
