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* the Apache License, Version 2.0 (the "License"); you may
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* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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*/
package org.elasticsearch.common.geo;
import org.apache.lucene.geo.Rectangle;
import org.elasticsearch.test.ESTestCase;
/**
* Tests for {@link org.elasticsearch.common.geo.GeoHashUtils}
*/
public class GeoHashTests extends ESTestCase {
public void testGeohashAsLongRoutines() {
final GeoPoint expected = new GeoPoint();
final GeoPoint actual = new GeoPoint();
//Ensure that for all points at all supported levels of precision
// that the long encoding of a geohash is compatible with its
// String based counterpart
for (double lat=-90;lat<90;lat++)
{
for (double lng=-180;lng<180;lng++)
{
for(int p=1;p<=12;p++)
{
long geoAsLong = GeoHashUtils.longEncode(lng, lat, p);
// string encode from geohashlong encoded location
String geohashFromLong = GeoHashUtils.stringEncode(geoAsLong);
// string encode from full res lat lon
String geohash = GeoHashUtils.stringEncode(lng, lat, p);
// ensure both strings are the same
assertEquals(geohash, geohashFromLong);
// decode from the full-res geohash string
expected.resetFromGeoHash(geohash);
// decode from the geohash encoded long
actual.resetFromGeoHash(geoAsLong);
assertEquals(expected, actual);
}
}
}
}
public void testBboxFromHash() {
String hash = randomGeohash(1, 12);
int level = hash.length();
Rectangle bbox = GeoHashUtils.bbox(hash);
// check that the length is as expected
double expectedLonDiff = 360.0 / (Math.pow(8.0, (level + 1) / 2) * Math.pow(4.0, level / 2));
double expectedLatDiff = 180.0 / (Math.pow(4.0, (level + 1) / 2) * Math.pow(8.0, level / 2));
assertEquals(expectedLonDiff, bbox.maxLon - bbox.minLon, 0.00001);
assertEquals(expectedLatDiff, bbox.maxLat - bbox.minLat, 0.00001);
assertEquals(hash, GeoHashUtils.stringEncode(bbox.minLon, bbox.minLat, level));
}
}