/*
* Copyright (C) 2011 The Guava Authors
*
* Licensed 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 com.google.common.primitives;
import static java.math.BigInteger.ONE;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.Helpers;
import com.google.common.testing.NullPointerTester;
import junit.framework.TestCase;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.Random;
/**
* Tests for UnsignedLongs
*
* @author Brian Milch
* @author Louis Wasserman
*/
@GwtCompatible(emulated = true)
public class UnsignedLongsTest extends TestCase {
private static final long LEAST = 0L;
private static final long GREATEST = 0xffffffffffffffffL;
public void testCompare() {
// max value
assertTrue(UnsignedLongs.compare(0, 0xffffffffffffffffL) < 0);
assertTrue(UnsignedLongs.compare(0xffffffffffffffffL, 0) > 0);
// both with high bit set
assertTrue(UnsignedLongs.compare(0xff1a618b7f65ea12L, 0xffffffffffffffffL) < 0);
assertTrue(UnsignedLongs.compare(0xffffffffffffffffL, 0xff1a618b7f65ea12L) > 0);
// one with high bit set
assertTrue(UnsignedLongs.compare(0x5a4316b8c153ac4dL, 0xff1a618b7f65ea12L) < 0);
assertTrue(UnsignedLongs.compare(0xff1a618b7f65ea12L, 0x5a4316b8c153ac4dL) > 0);
// neither with high bit set
assertTrue(UnsignedLongs.compare(0x5a4316b8c153ac4dL, 0x6cf78a4b139a4e2aL) < 0);
assertTrue(UnsignedLongs.compare(0x6cf78a4b139a4e2aL, 0x5a4316b8c153ac4dL) > 0);
// same value
assertTrue(UnsignedLongs.compare(0xff1a618b7f65ea12L, 0xff1a618b7f65ea12L) == 0);
}
public void testMax_noArgs() {
try {
UnsignedLongs.max();
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testMax() {
assertEquals(LEAST, UnsignedLongs.max(LEAST));
assertEquals(GREATEST, UnsignedLongs.max(GREATEST));
assertEquals(0xff1a618b7f65ea12L, UnsignedLongs.max(
0x5a4316b8c153ac4dL, 8L, 100L,
0L, 0x6cf78a4b139a4e2aL, 0xff1a618b7f65ea12L));
}
public void testMin_noArgs() {
try {
UnsignedLongs.min();
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testMin() {
assertEquals(LEAST, UnsignedLongs.min(LEAST));
assertEquals(GREATEST, UnsignedLongs.min(GREATEST));
assertEquals(0L, UnsignedLongs.min(
0x5a4316b8c153ac4dL, 8L, 100L,
0L, 0x6cf78a4b139a4e2aL, 0xff1a618b7f65ea12L));
}
public void testLexicographicalComparator() {
List<long[]> ordered = Arrays.asList(
new long[] {},
new long[] {LEAST},
new long[] {LEAST, LEAST},
new long[] {LEAST, (long) 1},
new long[] {(long) 1},
new long[] {(long) 1, LEAST},
new long[] {GREATEST, GREATEST - (long) 1},
new long[] {GREATEST, GREATEST},
new long[] {GREATEST, GREATEST, GREATEST});
Comparator<long[]> comparator = UnsignedLongs.lexicographicalComparator();
Helpers.testComparator(comparator, ordered);
}
public void testDivide() {
assertEquals(2, UnsignedLongs.divide(14, 5));
assertEquals(0, UnsignedLongs.divide(0, 50));
assertEquals(1, UnsignedLongs.divide(0xfffffffffffffffeL, 0xfffffffffffffffdL));
assertEquals(0, UnsignedLongs.divide(0xfffffffffffffffdL, 0xfffffffffffffffeL));
assertEquals(281479271743488L, UnsignedLongs.divide(0xfffffffffffffffeL, 65535));
assertEquals(0x7fffffffffffffffL, UnsignedLongs.divide(0xfffffffffffffffeL, 2));
assertEquals(3689348814741910322L, UnsignedLongs.divide(0xfffffffffffffffeL, 5));
}
public void testRemainder() {
assertEquals(4, UnsignedLongs.remainder(14, 5));
assertEquals(0, UnsignedLongs.remainder(0, 50));
assertEquals(1, UnsignedLongs.remainder(0xfffffffffffffffeL, 0xfffffffffffffffdL));
assertEquals(0xfffffffffffffffdL,
UnsignedLongs.remainder(0xfffffffffffffffdL, 0xfffffffffffffffeL));
assertEquals(65534L, UnsignedLongs.remainder(0xfffffffffffffffeL, 65535));
assertEquals(0, UnsignedLongs.remainder(0xfffffffffffffffeL, 2));
assertEquals(4, UnsignedLongs.remainder(0xfffffffffffffffeL, 5));
}
@GwtIncompatible("Too slow in GWT (~3min fully optimized)")
public void testDivideRemainderEuclideanProperty() {
// Use a seed so that the test is deterministic:
Random r = new Random(0L);
for (int i = 0; i < 1000000; i++) {
long dividend = r.nextLong();
long divisor = r.nextLong();
// Test that the Euclidean property is preserved:
assertEquals(0,
dividend - (divisor * UnsignedLongs.divide(dividend, divisor)
+ UnsignedLongs.remainder(dividend, divisor)));
}
}
public void testParseLong() {
assertEquals(0xffffffffffffffffL, UnsignedLongs.parseUnsignedLong("18446744073709551615"));
assertEquals(0x7fffffffffffffffL, UnsignedLongs.parseUnsignedLong("9223372036854775807"));
assertEquals(0xff1a618b7f65ea12L, UnsignedLongs.parseUnsignedLong("18382112080831834642"));
assertEquals(0x5a4316b8c153ac4dL, UnsignedLongs.parseUnsignedLong("6504067269626408013"));
assertEquals(0x6cf78a4b139a4e2aL, UnsignedLongs.parseUnsignedLong("7851896530399809066"));
try {
// One more than maximum value
UnsignedLongs.parseUnsignedLong("18446744073709551616");
fail();
} catch (NumberFormatException expected) {
}
}
public void testDecodeLong() {
assertEquals(0xffffffffffffffffL, UnsignedLongs.decode("0xffffffffffffffff"));
assertEquals(01234567, UnsignedLongs.decode("01234567")); // octal
assertEquals(0x1234567890abcdefL, UnsignedLongs.decode("#1234567890abcdef"));
assertEquals(987654321012345678L, UnsignedLongs.decode("987654321012345678"));
assertEquals(0x135791357913579L, UnsignedLongs.decode("0x135791357913579"));
assertEquals(0x135791357913579L, UnsignedLongs.decode("0X135791357913579"));
assertEquals(0L, UnsignedLongs.decode("0"));
}
public void testDecodeLongFails() {
try {
// One more than maximum value
UnsignedLongs.decode("0xfffffffffffffffff");
fail();
} catch (NumberFormatException expected) {
}
try {
UnsignedLongs.decode("-5");
fail();
} catch (NumberFormatException expected) {
}
try {
UnsignedLongs.decode("-0x5");
fail();
} catch (NumberFormatException expected) {
}
try {
UnsignedLongs.decode("-05");
fail();
} catch (NumberFormatException expected) {
}
}
public void testParseLongWithRadix() {
assertEquals(0xffffffffffffffffL, UnsignedLongs.parseUnsignedLong("ffffffffffffffff", 16));
assertEquals(0x1234567890abcdefL, UnsignedLongs.parseUnsignedLong("1234567890abcdef", 16));
BigInteger max = BigInteger.ZERO.setBit(64).subtract(ONE);
// loops through all legal radix values.
for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
// tests can successfully parse a number string with this radix.
String maxAsString = max.toString(radix);
assertEquals(max.longValue(), UnsignedLongs.parseUnsignedLong(maxAsString, radix));
try {
// tests that we get exception whre an overflow would occur.
BigInteger overflow = max.add(ONE);
String overflowAsString = overflow.toString(radix);
UnsignedLongs.parseUnsignedLong(overflowAsString, radix);
fail();
} catch (NumberFormatException expected) {
}
}
try {
UnsignedLongs.parseUnsignedLong("1234567890abcdef1", 16);
fail();
} catch (NumberFormatException expected) {
}
}
public void testParseLongThrowsExceptionForInvalidRadix() {
// Valid radix values are Character.MIN_RADIX to Character.MAX_RADIX, inclusive.
try {
UnsignedLongs.parseUnsignedLong("0", Character.MIN_RADIX - 1);
fail();
} catch (NumberFormatException expected) {
}
try {
UnsignedLongs.parseUnsignedLong("0", Character.MAX_RADIX + 1);
fail();
} catch (NumberFormatException expected) {
}
// The radix is used as an array index, so try a negative value.
try {
UnsignedLongs.parseUnsignedLong("0", -1);
fail();
} catch (NumberFormatException expected) {
}
}
public void testToString() {
String[] tests = {
"ffffffffffffffff",
"7fffffffffffffff",
"ff1a618b7f65ea12",
"5a4316b8c153ac4d",
"6cf78a4b139a4e2a"
};
int[] bases = { 2, 5, 7, 8, 10, 16 };
for (int base : bases) {
for (String x : tests) {
BigInteger xValue = new BigInteger(x, 16);
long xLong = xValue.longValue(); // signed
assertEquals(xValue.toString(base), UnsignedLongs.toString(xLong, base));
}
}
}
public void testJoin() {
assertEquals("", UnsignedLongs.join(","));
assertEquals("1", UnsignedLongs.join(",", 1));
assertEquals("1,2", UnsignedLongs.join(",", 1, 2));
assertEquals("18446744073709551615,9223372036854775808",
UnsignedLongs.join(",", -1, Long.MIN_VALUE));
assertEquals("123", UnsignedLongs.join("", 1, 2, 3));
assertEquals("184467440737095516159223372036854775808",
UnsignedLongs.join("", -1, Long.MIN_VALUE));
}
@GwtIncompatible("NullPointerTester")
public void testNulls() {
NullPointerTester tester = new NullPointerTester();
tester.setDefault(long[].class, new long[0]);
tester.setDefault(BigInteger.class, BigInteger.ZERO);
tester.testAllPublicStaticMethods(UnsignedLongs.class);
}
}