Examples with DepthFirstInstanceTraverser eu.esdihumboldt.hale.common.instance.helper.DepthFirstInstanceTraverser used on opensource projects

Example 11 with DepthFirstInstanceTraverser

use of eu.esdihumboldt.hale.common.instance.helper.DepthFirstInstanceTraverser in project hale by halestudio.

the class InteriorPoint method calculateInteriorPoint.

/**
 * Calculate an interior point for a given geometry or object holding a
 * geometry.
 *
 * @param geometryHolder {@link Geometry}, {@link GeometryProperty} or
 *            {@link Instance} holding a geometry
 * @return an interior point of the geometry
 * @throws TransformationException if the interior point could not be
 *             calculated
 */
public static GeometryProperty<?> calculateInteriorPoint(Object geometryHolder) throws TransformationException {
    // depth first traverser that on cancel continues traversal but w/o the
    // children of the current object
    InstanceTraverser traverser = new DepthFirstInstanceTraverser(true);
    GeometryFinder geoFind = new GeometryFinder(null);
    traverser.traverse(geometryHolder, geoFind);
    List<GeometryProperty<?>> geoms = geoFind.getGeometries();
    Geometry result;
    CRSDefinition oldCRS = null;
    // use the first geometry encountered
    int index = 0;
    Geometry geom = null;
    while (geom == null && index < geoms.size()) {
        geom = geoms.get(index).getGeometry();
        oldCRS = geoms.get(index).getCRSDefinition();
        index++;
    }
    if (geom != null) {
        try {
            result = geom.getInteriorPoint();
        } catch (TopologyException e) {
            // calculate the point for a geometry with a small buffer to
            // avoid error with polygons that have overlapping lines
            result = geom.buffer(0.000001).getInteriorPoint();
            if (!result.within(geom)) {
                // geometry
                throw new TransformationException("Could not determine interior point for geometry");
            }
        }
    } else {
        return null;
    }
    return new DefaultGeometryProperty<Geometry>(oldCRS, result);
}

Example 12 with DepthFirstInstanceTraverser

use of eu.esdihumboldt.hale.common.instance.helper.DepthFirstInstanceTraverser in project hale by halestudio.

the class SpatialIndexInstanceProcessor method process.

/**
 * @see eu.esdihumboldt.hale.common.instance.processing.InstanceProcessor#process(eu.esdihumboldt.hale.common.instance.model.Instance,
 *      eu.esdihumboldt.hale.common.instance.model.InstanceReference)
 */
@Override
public void process(Instance instance, InstanceReference reference) {
    SpatialIndexService<Localizable, Localizable> index = getSpatialIndexService();
    final GeometryFinder finder = new GeometryFinder(null);
    InstanceTraverser traverser = new DepthFirstInstanceTraverser(true);
    traverser.traverse(instance, finder);
    final List<Geometry> geometries = new ArrayList<>();
    for (GeometryProperty<?> property : finder.getGeometries()) {
        Geometry g = property.getGeometry();
        for (int i = 0; i < g.getNumGeometries(); i++) {
            geometries.add(g.getGeometryN(i));
        }
    }
    final BoundingBox boundingBox = new BoundingBox();
    for (Geometry geometry : geometries) {
        boundingBox.add(BoundingBox.compute(geometry));
    }
    if (boundingBox.checkIntegrity()) {
        TypedInstanceReference typedRef = new TypedInstanceReference(reference, instance.getDefinition());
        index.insert(new LocalizableInstanceReference(typedRef, boundingBox));
    }
}