/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. 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 KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.lucene.spatial.geohash;
import static junit.framework.Assert.*;
import org.apache.lucene.util.LuceneTestCase;
import org.junit.Test;
/**
* Tests for {@link GeoHashUtils}
*/
public class TestGeoHashUtils extends LuceneTestCase {
/**
* Pass condition: lat=42.6, lng=-5.6 should be encoded as "ezs42e44yx96",
* lat=57.64911 lng=10.40744 should be encoded as "u4pruydqqvj8"
*/
@Test
public void testEncode() {
String hash = GeoHashUtils.encode(42.6, -5.6);
assertEquals("ezs42e44yx96", hash);
hash = GeoHashUtils.encode(57.64911, 10.40744);
assertEquals("u4pruydqqvj8", hash);
}
/**
* Pass condition: lat=52.3738007, lng=4.8909347 should be encoded and then
* decoded within 0.00001 of the original value
*/
@Test
public void testDecodePreciseLongitudeLatitude() {
String hash = GeoHashUtils.encode(52.3738007, 4.8909347);
double[] latitudeLongitude = GeoHashUtils.decode(hash);
assertEquals(52.3738007, latitudeLongitude[0], 0.00001D);
assertEquals(4.8909347, latitudeLongitude[1], 0.00001D);
}
/**
* Pass condition: lat=84.6, lng=10.5 should be encoded and then decoded
* within 0.00001 of the original value
*/
@Test
public void testDecodeImpreciseLongitudeLatitude() {
String hash = GeoHashUtils.encode(84.6, 10.5);
double[] latitudeLongitude = GeoHashUtils.decode(hash);
assertEquals(84.6, latitudeLongitude[0], 0.00001D);
assertEquals(10.5, latitudeLongitude[1], 0.00001D);
}
/*
* see https://issues.apache.org/jira/browse/LUCENE-1815 for details
*/
@Test
public void testDecodeEncode() {
String geoHash = "u173zq37x014";
assertEquals(geoHash, GeoHashUtils.encode(52.3738007, 4.8909347));
double[] decode = GeoHashUtils.decode(geoHash);
assertEquals(52.37380061d, decode[0], 0.000001d);
assertEquals(4.8909343d, decode[1], 0.000001d);
assertEquals(geoHash, GeoHashUtils.encode(decode[0], decode[1]));
geoHash = "u173";
decode = GeoHashUtils.decode("u173");
geoHash = GeoHashUtils.encode(decode[0], decode[1]);
assertEquals(decode[0], GeoHashUtils.decode(geoHash)[0], 0.000001d);
assertEquals(decode[1], GeoHashUtils.decode(geoHash)[1], 0.000001d);
}
}