Subversion Repositories splitter

/*
 * Copyright (c) 2009.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */

package uk.me.parabola.splitter;

/**
 * Collects node coordinates in a map.
 */
class NodeCollector implements MapCollector {

        private SplitIntList coords = new SplitIntList();
        private final MapDetails details = new MapDetails();
        private Area bounds;

        @Override
        public boolean isStartNodeOnly() {
                return true;
        }

        @Override
        public void boundTag(Area bounds) {
                if (this.bounds == null)
                        this.bounds = bounds;
                else
                        this.bounds = this.bounds.add(bounds);
        }

        @Override
        public void processNode(Node n) {
                // Since we are rounding areas to fit on a low zoom boundary we
                // can drop the bottom 8 bits of the lat and lon and then fit
                // the whole lot into a single int.
                int glat = Utils.toMapUnit(n.getLat());
                int glon = Utils.toMapUnit(n.getLon());        
                int coord = ((glat << 8) & 0xffff0000) + ((glon >> 8) & 0xffff);

                coords.add(coord);
                details.addToBounds(glat, glon);
        }

        @Override
        public void processWay(Way w) {}

        @Override
        public void processRelation(Relation r) {}

        @Override
        public void endMap() {}

        @Override
        public Area getExactArea() {
                if (bounds != null) {
                        return bounds;
                } else {
                        return details.getBounds();
                }
        }

        @Override
        public SplittableArea getRoundedArea(int resolution) {
                Area bounds = RoundingUtils.round(getExactArea(), resolution);
                SplittableArea result = new SplittableNodeArea(bounds, coords, resolution);
                coords = null;
                return result;
        }
}