@Test
public void testGetLongitudeBits() {
hash = GeoHash.withBitPrecision(30, 30, 16);
long[] longitudeBits = hash.getRightAlignedLongitudeBits();
assertEquals(0x95l, longitudeBits[0]);
assertEquals(8, longitudeBits[1]);
}
private void assertAdjacentHashesAre(String centerString, String[] adjacentStrings) {
GeoHash center = GeoHash.fromGeohashString(centerString);
GeoHash[] adjacent = center.getAdjacent();
for (String check : adjacentStrings) {
assertArrayContainsGeoHash(check, adjacent);
}
}
private void assertEncodingWithCharacterPrecision(
WGS84Point point, int numberOfCharacters, String stringValue) {
GeoHash hash =
GeoHash.withCharacterPrecision(
point.getLatitude(), point.getLongitude(), numberOfCharacters);
assertEquals(stringValue, hash.toBase32());
}
@Test
public void testNext() {
double lat = 37.7;
double lon = -122.52;
GeoHash hash = GeoHash.withBitPrecision(lat, lon, 10);
GeoHash next = hash.next();
assertTrue(hash.compareTo(next) < 0);
}
@Test
public void testToBase32() {
hash.bits = 0x6ff0414000000000l;
hash.significantBits = 25;
String base32 = hash.toBase32();
assertEquals("ezs42", base32);
}
@Test
public void testToAndFromBinaryString() {
for (GeoHash gh : RandomGeohashes.fullRange()) {
String binaryString = gh.toBinaryString();
GeoHash readBack = GeoHash.fromBinaryString(binaryString);
assertEquals(gh, readBack);
}
}
private void assertArrayContainsGeoHash(String check, GeoHash[] hashes) {
boolean found = false;
for (GeoHash hash : hashes) {
if (hash.toBase32().equals(check)) {
found = true;
break;
}
}
assertTrue("Array should contain " + check, found);
}
@Test
public void testAddingOnes() {
hash.addOnBitToEnd();
assertEquals(0x1l, hash.bits);
assertEquals(1, hash.significantBits());
hash.addOnBitToEnd();
hash.addOnBitToEnd();
hash.addOnBitToEnd();
assertEquals(0xfl, hash.bits);
assertEquals(4, hash.significantBits());
}
@Test
public void testAddingZeroes() {
hash.addOnBitToEnd();
assertEquals(0x1l, hash.bits);
hash.addOffBitToEnd();
hash.addOffBitToEnd();
hash.addOffBitToEnd();
hash.addOffBitToEnd();
assertEquals(0x10l, hash.bits);
assertEquals(5, hash.significantBits());
}
@Test
public void testToLongAndBack() {
double lat = 40.390943;
double lon = -75.9375;
GeoHash hash = GeoHash.withCharacterPrecision(lat, lon, 10);
long lv = hash.longValue();
assertEquals(lv + (1 << (64 - hash.significantBits())), hash.next().longValue());
GeoHash hashFromLong = GeoHash.fromLongValue(lv, hash.significantBits());
assertEquals("dr4jb0bn21", hashFromLong.toBase32());
assertEquals(hash, hashFromLong);
}
private void checkMovingInCircle(double latitude, double longitude) {
GeoHash start;
GeoHash end;
start = GeoHash.withCharacterPrecision(latitude, longitude, 12);
end = start.getEasternNeighbour();
end = end.getSouthernNeighbour();
end = end.getWesternNeighbour();
end = end.getNorthernNeighbour();
assertEquals(start, end);
assertEquals(start.getBoundingBox(), end.getBoundingBox());
}
@Test
public void testNotWithin() {
hash.bits = 0x6ff0414000000000l;
hash.significantBits = 25;
assertEquals("ezs42", hash.toBase32());
GeoHash bbox = new GeoHash();
bbox.bits = 0x6fc0000000000000l;
bbox.significantBits = 12;
assertFalse(hash.toBase32() + " should NOT be within " + bbox.toBase32(), hash.within(bbox));
}
private void checkMoveAroundStrip(String direction) throws Exception {
for (int bits = 2; bits < 16; bits++) {
double randomLatitude = (rand.nextDouble() - 0.5) * 180;
double randomLongitude = (rand.nextDouble() - 0.5) * 360;
// this divides the range by 2^bits
GeoHash hash = GeoHash.withBitPrecision(randomLatitude, randomLongitude, bits);
Method method = hash.getClass().getDeclaredMethod("get" + direction + "Neighbour");
GeoHash result = hash;
// moving this direction 2^bits times should yield the same hash
// again
for (int i = 0; i < Math.pow(2, bits); i++) {
result = (GeoHash) method.invoke(result);
}
assertEquals(hash, result);
}
}
@Test
public void testNeibouringHashesNearMeridian() {
GeoHash hash = GeoHash.fromGeohashString("sp2j");
GeoHash west = hash.getWesternNeighbour();
assertEquals("ezrv", west.toBase32());
west = west.getWesternNeighbour();
assertEquals("ezrt", west.toBase32());
}
@Test
public void testDecode() {
// for all lat/lon pairs check decoded point is in the same bbox as the
// geohash formed by encoder
for (GeoHash gh : RandomGeohashes.fullRange()) {
BoundingBox bbox = gh.getBoundingBox();
GeoHash decodedHash = GeoHash.fromGeohashString(gh.toBase32());
WGS84Point decodedCenter = decodedHash.getBoundingBoxCenterPoint();
assertTrue(
"bbox " + bbox + " should contain the decoded center value " + decodedCenter,
bbox.contains(decodedCenter));
BoundingBox decodedBoundingBox = decodedHash.getBoundingBox();
assertEquals(bbox, decodedBoundingBox);
assertEquals(gh, decodedHash);
assertEquals(gh.toBase32(), decodedHash.toBase32());
}
}
@Test
public void testKnownNeighbouringHashes() {
GeoHash h1 = GeoHash.fromGeohashString("u1pb");
assertEquals("u0zz", h1.getSouthernNeighbour().toBase32());
assertEquals("u1pc", h1.getNorthernNeighbour().toBase32());
assertEquals("u300", h1.getEasternNeighbour().toBase32());
assertEquals("u302", h1.getEasternNeighbour().getEasternNeighbour().toBase32());
assertEquals("u1p8", h1.getWesternNeighbour().toBase32());
assertEquals("sp2j", GeoHash.withCharacterPrecision(41.7, 0.08, 4).toBase32());
}
@Test
public void testConstructorWithBitPrecision() {
GeoHash hash1 = GeoHash.withBitPrecision(45, 120, 20);
assertEquals(hash1.significantBits, 20);
System.out.println(hash1);
System.out.println(hash1.toBase32());
GeoHash hash2 = GeoHash.withBitPrecision(45, 120, 55);
assertEquals(hash2.significantBits, 55);
System.out.println(hash2);
System.out.println(hash2.toBase32());
assertTrue(hash2.within(hash1));
// this should match Dave Troys Codebase. This is also his maximum
// accuracy (12 5-nibbles).
GeoHash hash3 = GeoHash.withBitPrecision(20, 31, 60);
assertEquals("sew1c2vs2q5r", hash3.toBase32());
System.out.println("--------------");
String hash4 = new GeoHash().geoHashStringWithCharacterPrecision(45, 120, 64);
System.out.println(hash4);
}
@Test
public void testThatAdjacentHashesHavePointInitialized() {
String center = "dqcjqc";
GeoHash geohash = GeoHash.fromGeohashString(center);
GeoHash[] adjacentHashes = geohash.getAdjacent();
for (GeoHash adjacentHash : adjacentHashes) {
assertNotNull(adjacentHash.getBoundingBox());
assertNotNull(adjacentHash.getBoundingBoxCenterPoint());
assertNotNull(adjacentHash.getPoint());
}
}
@Test
public void testIssue1() {
double lat = 40.390943;
double lon = -75.9375;
GeoHash hash = GeoHash.withCharacterPrecision(lat, lon, 12);
String base32 = "dr4jb0bn2180";
GeoHash fromRef = GeoHash.fromGeohashString(base32);
assertEquals(hash, fromRef);
assertEquals(base32, hash.toBase32());
assertEquals(base32, fromRef.toBase32());
hash = GeoHash.withCharacterPrecision(lat, lon, 10);
assertEquals("dr4jb0bn21", hash.toBase32());
}
@Test
public void testWithin() {
hash.bits = 0x6ff0414000000000l;
hash.significantBits = 25;
System.out.println(hash.toBase32());
assertEquals("ezs42", hash.toBase32());
GeoHash bbox = new GeoHash();
bbox.bits = 0x6ff0000000000000l;
bbox.significantBits = 12;
assertWithin(hash, bbox);
}
@Test
public void testByCharacterPrecision() {
assertEncodingWithCharacterPrecision(new WGS84Point(20, 31), 12, "sew1c2vs2q5r");
assertEncodingWithCharacterPrecision(new WGS84Point(-20, 31), 12, "ksqn1rje83g2");
assertEncodingWithCharacterPrecision(
new WGS84Point(-20.783236276, 31.9867127312312), 12, "ksq9zbs0b7vw");
WGS84Point point = new WGS84Point(-76.5110040642321, 39.0247389581054);
String fullStringValue = "hf7u8p8gn747";
for (int characters = 12; characters > 1; characters--) {
assertEncodingWithCharacterPrecision(
point, characters, fullStringValue.substring(0, characters));
}
assertEncodingWithCharacterPrecision(
new WGS84Point(39.0247389581054, -76.5110040642321), 12, "dqcw4bnrs6s7");
String geoHashString =
GeoHash.geoHashStringWithCharacterPrecision(point.getLatitude(), point.getLongitude(), 12);
assertEquals(fullStringValue, geoHashString);
}
@Test
public void testNeighbourLocationCode() {
// set up corner case
hash.bits = 0xc400000000000000l;
hash.significantBits = 7;
long[] lonBits = hash.getRightAlignedLongitudeBits();
assertEquals(0x8, lonBits[0]);
assertEquals(4, lonBits[1]);
long[] latBits = hash.getRightAlignedLatitudeBits();
assertEquals(0x5, latBits[0]);
assertEquals(3, latBits[1]);
GeoHash north = hash.getNorthernNeighbour();
assertEquals(0xd000000000000000l, north.bits);
assertEquals(7, north.significantBits);
GeoHash south = hash.getSouthernNeighbour();
assertEquals(0xc000000000000000l, south.bits);
assertEquals(7, south.significantBits());
GeoHash east = hash.getEasternNeighbour();
assertEquals(0xc600000000000000l, east.bits);
// NOTE: this is actually a corner case!
GeoHash west = hash.getWesternNeighbour();
assertEquals(0x6e00000000000000l, west.bits);
// NOTE: and now, for the most extreme corner case in 7-bit geohash-land
hash.bits = 0xfe00000000000000l;
east = hash.getEasternNeighbour();
assertEquals(0x5400000000000000l, east.bits);
}
@Test
public void testEqualsAndHashCode() {
GeoHash hash1 = GeoHash.withBitPrecision(30, 30, 24);
GeoHash hash2 = GeoHash.withBitPrecision(30, 30, 24);
GeoHash hash3 = GeoHash.withBitPrecision(30, 30, 10);
assertTrue(hash1.equals(hash2) && hash2.equals(hash1));
assertFalse(hash1.equals(hash3) && hash3.equals(hash1));
assertEquals(hash1.hashCode(), hash2.hashCode());
assertFalse(hash1.hashCode() == hash3.hashCode());
}
@Test
public void testStepsBetween() {
GeoHash bl = GeoHash.withBitPrecision(37.7, -122.52, 35);
GeoHash ur = GeoHash.withBitPrecision(37.84, -122.35, 35);
long steps = GeoHash.stepsBetween(bl, bl);
assertEquals(steps, 0);
steps = GeoHash.stepsBetween(bl, bl.next(4));
assertEquals(steps, 4);
BoundingBoxGeoHashIterator iter =
new BoundingBoxGeoHashIterator(new TwoGeoHashBoundingBox(bl, ur));
int count = 0;
while (iter.hasNext()) {
iter.next();
count++;
}
assertEquals(12875, count);
int allHashes = 0;
int inBbox = 1;
int latMore = 0;
int lonMore = 0;
int bothMore = 0;
int latLess = 0;
int lonLess = 0;
int bothLess = 0;
int latLessLonMore = 0;
int latMoreLonLess = 0;
GeoHash idx = bl;
BoundingBox iterBbox = iter.getBoundingBox().getBoundingBox();
while (idx.compareTo(ur) < 0) {
idx = idx.next();
allHashes++;
if (iterBbox.contains(idx.getPoint())) {
inBbox++;
}
boolean latIsMore = false;
boolean latIsLess = false;
if (idx.getPoint().getLatitude() > iterBbox.getMaxLat()) {
latIsMore = true;
latMore++;
} else if (idx.getPoint().getLatitude() < iterBbox.getMinLat()) {
latIsLess = true;
latLess++;
}
if (idx.getPoint().getLongitude() > iterBbox.getMaxLon()) {
lonMore++;
if (latIsMore) {
bothMore++;
}
if (latIsLess) {
latLessLonMore++;
}
} else if (idx.getPoint().getLongitude() < iterBbox.getMinLon()) {
lonLess++;
if (latIsLess) {
bothLess++;
}
if (latIsMore) {
latMoreLonLess++;
}
}
}
// Just trying to understand where these GeoHashes are with regard to
// their bounding box.
steps = GeoHash.stepsBetween(bl, ur);
assertEquals(48472, steps);
assertEquals(steps, allHashes);
assertEquals(count, inBbox);
assertEquals(14938, latMore);
assertEquals(640, lonMore);
assertEquals(0, bothMore);
assertEquals(7680, latLess);
assertEquals(24391, lonLess);
assertEquals(0, bothLess);
assertEquals(240, latLessLonMore);
assertEquals(11811, latMoreLonLess);
assertEquals(
steps,
lonLess + latLess + latMore + lonMore + inBbox - latLessLonMore - latMoreLonLess - 1);
}
@Test
public void testGetCharacterPrecisionWorksWhenPrecisionIsMultipleOfFive() throws Exception {
GeoHash hash = GeoHash.withBitPrecision(37.7, -122.52, 60);
int precision = hash.getCharacterPrecision();
assertEquals(precision, 12);
}
@Test(expected = IllegalStateException.class)
public void testGetCharacterPrecisionThrows() throws Exception {
GeoHash hash = GeoHash.withBitPrecision(37.7, -122.52, 32);
hash.getCharacterPrecision();
}
@Test
public void testNextPrev() {
double lat = 37.7;
double lon = -122.52;
GeoHash hash = GeoHash.withBitPrecision(lat, lon, 35);
GeoHash next = hash.next(2);
assertTrue(hash.compareTo(next) < 0);
GeoHash prev1 = next.prev();
GeoHash prev2 = prev1.next(-1);
assertTrue(prev1.compareTo(next) < 0);
System.out.println("hash: " + hash.toBase32());
System.out.println("next: " + next.toBase32());
System.out.println("prev1: " + prev1.toBase32());
System.out.println("prev2: " + prev2.toBase32());
assertTrue(prev2.compareTo(prev1) < 0);
assertTrue(prev2.compareTo(hash) == 0);
}
@Test
public void testAdjacentHashes() {
GeoHash[] adjacent = GeoHash.fromGeohashString("dqcw4").getAdjacent();
assertEquals(8, adjacent.length);
}
private void printBoundingBox(GeoHash hash) {
System.out.println("Bounding Box: \ncenter =" + hash.getBoundingBoxCenterPoint());
System.out.print("corners=");
System.out.println(hash.getBoundingBox());
}
@Test
public void testSimpleWithin() {
GeoHash hash = GeoHash.withBitPrecision(70, -120, 8);
GeoHash inside = GeoHash.withBitPrecision(74, -130, 64);
assertWithin(inside, hash);
}
