public void testCombineUnordered() {
HashCode hash31 = HashCodes.fromInt(31);
HashCode hash32 = HashCodes.fromInt(32);
assertEquals(hash32, Hashing.combineUnordered(ImmutableList.of(hash32)));
assertEquals(HashCodes.fromInt(64), Hashing.combineUnordered(ImmutableList.of(hash32, hash32)));
assertEquals(
HashCodes.fromInt(96), Hashing.combineUnordered(ImmutableList.of(hash32, hash32, hash32)));
assertEquals(
Hashing.combineUnordered(ImmutableList.of(hash31, hash32)),
Hashing.combineUnordered(ImmutableList.of(hash32, hash31)));
}
public void testCombineUnordered_randomHashCodes() {
Random random = new Random();
List<HashCode> hashCodes = Lists.newArrayList();
for (int i = 0; i < 10; i++) {
hashCodes.add(HashCodes.fromLong(random.nextLong()));
}
HashCode hashCode1 = Hashing.combineUnordered(hashCodes);
Collections.shuffle(hashCodes);
HashCode hashCode2 = Hashing.combineUnordered(hashCodes);
assertEquals(hashCode1, hashCode2);
}
public void testCombineUnordered_differentBitLengths() {
try {
Hashing.combineUnordered(ImmutableList.of(HashCodes.fromInt(32), HashCodes.fromLong(32L)));
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testCombineUnordered_empty() {
try {
Hashing.combineUnordered(Collections.<HashCode>emptySet());
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testCombineUnordered_null() {
try {
Hashing.combineUnordered(null);
fail();
} catch (NullPointerException expected) {
}
}
private String generateHash(@Nonnull List<TableRow> rows) {
List<HashCode> rowHashes = Lists.newArrayList();
for (TableRow row : rows) {
List<String> cellsInOneRow = Lists.newArrayList();
for (TableCell cell : row.getF()) {
cellsInOneRow.add(Objects.toString(cell.getV()));
Collections.sort(cellsInOneRow);
}
rowHashes.add(Hashing.sha1().hashString(cellsInOneRow.toString(), StandardCharsets.UTF_8));
}
return Hashing.combineUnordered(rowHashes).toString();
}