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      1 /*
      2  * Copyright (C) 2011 The Guava Authors
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
      5  * in compliance with the License. You may obtain a copy of the License at
      6  *
      7  * http://www.apache.org/licenses/LICENSE-2.0
      8  *
      9  * Unless required by applicable law or agreed to in writing, software distributed under the
     10  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
     11  * express or implied. See the License for the specific language governing permissions and
     12  * limitations under the License.
     13  */
     14 
     15 package com.google.common.primitives;
     16 
     17 import static java.math.BigInteger.ONE;
     18 
     19 import com.google.common.annotations.GwtCompatible;
     20 import com.google.common.collect.testing.Helpers;
     21 
     22 import junit.framework.TestCase;
     23 
     24 import java.math.BigInteger;
     25 import java.util.Arrays;
     26 import java.util.Comparator;
     27 import java.util.List;
     28 
     29 /**
     30  * Tests for UnsignedLongs
     31  *
     32  * @author Brian Milch
     33  * @author Louis Wasserman
     34  */
     35 @GwtCompatible(emulated = true)
     36 public class UnsignedLongsTest extends TestCase {
     37   private static final long LEAST = 0L;
     38   private static final long GREATEST = 0xffffffffffffffffL;
     39 
     40   public void testCompare() {
     41     // max value
     42     assertTrue(UnsignedLongs.compare(0, 0xffffffffffffffffL) < 0);
     43     assertTrue(UnsignedLongs.compare(0xffffffffffffffffL, 0) > 0);
     44 
     45     // both with high bit set
     46     assertTrue(UnsignedLongs.compare(0xff1a618b7f65ea12L, 0xffffffffffffffffL) < 0);
     47     assertTrue(UnsignedLongs.compare(0xffffffffffffffffL, 0xff1a618b7f65ea12L) > 0);
     48 
     49     // one with high bit set
     50     assertTrue(UnsignedLongs.compare(0x5a4316b8c153ac4dL, 0xff1a618b7f65ea12L) < 0);
     51     assertTrue(UnsignedLongs.compare(0xff1a618b7f65ea12L, 0x5a4316b8c153ac4dL) > 0);
     52 
     53     // neither with high bit set
     54     assertTrue(UnsignedLongs.compare(0x5a4316b8c153ac4dL, 0x6cf78a4b139a4e2aL) < 0);
     55     assertTrue(UnsignedLongs.compare(0x6cf78a4b139a4e2aL, 0x5a4316b8c153ac4dL) > 0);
     56 
     57     // same value
     58     assertTrue(UnsignedLongs.compare(0xff1a618b7f65ea12L, 0xff1a618b7f65ea12L) == 0);
     59   }
     60 
     61   public void testMax_noArgs() {
     62     try {
     63       UnsignedLongs.max();
     64       fail();
     65     } catch (IllegalArgumentException expected) {
     66     }
     67   }
     68 
     69   public void testMax() {
     70     assertEquals(LEAST, UnsignedLongs.max(LEAST));
     71     assertEquals(GREATEST, UnsignedLongs.max(GREATEST));
     72     assertEquals(0xff1a618b7f65ea12L, UnsignedLongs.max(
     73         0x5a4316b8c153ac4dL, 8L, 100L,
     74         0L, 0x6cf78a4b139a4e2aL, 0xff1a618b7f65ea12L));
     75   }
     76 
     77   public void testMin_noArgs() {
     78     try {
     79       UnsignedLongs.min();
     80       fail();
     81     } catch (IllegalArgumentException expected) {
     82     }
     83   }
     84 
     85   public void testMin() {
     86     assertEquals(LEAST, UnsignedLongs.min(LEAST));
     87     assertEquals(GREATEST, UnsignedLongs.min(GREATEST));
     88     assertEquals(0L, UnsignedLongs.min(
     89         0x5a4316b8c153ac4dL, 8L, 100L,
     90         0L, 0x6cf78a4b139a4e2aL, 0xff1a618b7f65ea12L));
     91   }
     92 
     93   public void testLexicographicalComparator() {
     94     List<long[]> ordered = Arrays.asList(
     95         new long[] {},
     96         new long[] {LEAST},
     97         new long[] {LEAST, LEAST},
     98         new long[] {LEAST, (long) 1},
     99         new long[] {(long) 1},
    100         new long[] {(long) 1, LEAST},
    101         new long[] {GREATEST, GREATEST - (long) 1},
    102         new long[] {GREATEST, GREATEST},
    103         new long[] {GREATEST, GREATEST, GREATEST});
    104 
    105     Comparator<long[]> comparator = UnsignedLongs.lexicographicalComparator();
    106     Helpers.testComparator(comparator, ordered);
    107   }
    108 
    109   public void testDivide() {
    110     assertEquals(2, UnsignedLongs.divide(14, 5));
    111     assertEquals(0, UnsignedLongs.divide(0, 50));
    112     assertEquals(1, UnsignedLongs.divide(0xfffffffffffffffeL, 0xfffffffffffffffdL));
    113     assertEquals(0, UnsignedLongs.divide(0xfffffffffffffffdL, 0xfffffffffffffffeL));
    114     assertEquals(281479271743488L, UnsignedLongs.divide(0xfffffffffffffffeL, 65535));
    115     assertEquals(0x7fffffffffffffffL, UnsignedLongs.divide(0xfffffffffffffffeL, 2));
    116     assertEquals(3689348814741910322L, UnsignedLongs.divide(0xfffffffffffffffeL, 5));
    117   }
    118 
    119   public void testRemainder() {
    120     assertEquals(4, UnsignedLongs.remainder(14, 5));
    121     assertEquals(0, UnsignedLongs.remainder(0, 50));
    122     assertEquals(1, UnsignedLongs.remainder(0xfffffffffffffffeL, 0xfffffffffffffffdL));
    123     assertEquals(0xfffffffffffffffdL,
    124         UnsignedLongs.remainder(0xfffffffffffffffdL, 0xfffffffffffffffeL));
    125     assertEquals(65534L, UnsignedLongs.remainder(0xfffffffffffffffeL, 65535));
    126     assertEquals(0, UnsignedLongs.remainder(0xfffffffffffffffeL, 2));
    127     assertEquals(4, UnsignedLongs.remainder(0xfffffffffffffffeL, 5));
    128   }
    129 
    130   public void testParseLong() {
    131     assertEquals(0xffffffffffffffffL, UnsignedLongs.parseUnsignedLong("18446744073709551615"));
    132     assertEquals(0x7fffffffffffffffL, UnsignedLongs.parseUnsignedLong("9223372036854775807"));
    133     assertEquals(0xff1a618b7f65ea12L, UnsignedLongs.parseUnsignedLong("18382112080831834642"));
    134     assertEquals(0x5a4316b8c153ac4dL, UnsignedLongs.parseUnsignedLong("6504067269626408013"));
    135     assertEquals(0x6cf78a4b139a4e2aL, UnsignedLongs.parseUnsignedLong("7851896530399809066"));
    136 
    137     try {
    138       // One more than maximum value
    139       UnsignedLongs.parseUnsignedLong("18446744073709551616");
    140       fail();
    141     } catch (NumberFormatException expected) {
    142     }
    143   }
    144 
    145   public void testDecodeLong() {
    146     assertEquals(0xffffffffffffffffL, UnsignedLongs.decode("0xffffffffffffffff"));
    147     assertEquals(01234567, UnsignedLongs.decode("01234567")); // octal
    148     assertEquals(0x1234567890abcdefL, UnsignedLongs.decode("#1234567890abcdef"));
    149     assertEquals(987654321012345678L, UnsignedLongs.decode("987654321012345678"));
    150     assertEquals(0x135791357913579L, UnsignedLongs.decode("0x135791357913579"));
    151     assertEquals(0x135791357913579L, UnsignedLongs.decode("0X135791357913579"));
    152     assertEquals(0L, UnsignedLongs.decode("0"));
    153   }
    154 
    155   public void testDecodeLongFails() {
    156     try {
    157       // One more than maximum value
    158       UnsignedLongs.decode("0xfffffffffffffffff");
    159       fail();
    160     } catch (NumberFormatException expected) {
    161     }
    162 
    163     try {
    164       UnsignedLongs.decode("-5");
    165       fail();
    166     } catch (NumberFormatException expected) {
    167     }
    168 
    169     try {
    170       UnsignedLongs.decode("-0x5");
    171       fail();
    172     } catch (NumberFormatException expected) {
    173     }
    174 
    175     try {
    176       UnsignedLongs.decode("-05");
    177       fail();
    178     } catch (NumberFormatException expected) {
    179     }
    180   }
    181 
    182   public void testParseLongWithRadix() {
    183     assertEquals(0xffffffffffffffffL, UnsignedLongs.parseUnsignedLong("ffffffffffffffff", 16));
    184     assertEquals(0x1234567890abcdefL, UnsignedLongs.parseUnsignedLong("1234567890abcdef", 16));
    185 
    186     BigInteger max = BigInteger.ZERO.setBit(64).subtract(ONE);
    187     // loops through all legal radix values.
    188     for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
    189       // tests can successfully parse a number string with this radix.
    190       String maxAsString = max.toString(radix);
    191       assertEquals(max.longValue(), UnsignedLongs.parseUnsignedLong(maxAsString, radix));
    192 
    193       try {
    194         // tests that we get exception whre an overflow would occur.
    195         BigInteger overflow = max.add(ONE);
    196         String overflowAsString = overflow.toString(radix);
    197         UnsignedLongs.parseUnsignedLong(overflowAsString, radix);
    198         fail();
    199       } catch (NumberFormatException expected) {
    200       }
    201     }
    202 
    203     try {
    204       UnsignedLongs.parseUnsignedLong("1234567890abcdef1", 16);
    205       fail();
    206     } catch (NumberFormatException expected) {
    207     }
    208   }
    209 
    210   public void testParseLongThrowsExceptionForInvalidRadix() {
    211     // Valid radix values are Character.MIN_RADIX to Character.MAX_RADIX, inclusive.
    212     try {
    213       UnsignedLongs.parseUnsignedLong("0", Character.MIN_RADIX - 1);
    214       fail();
    215     } catch (NumberFormatException expected) {
    216     }
    217 
    218     try {
    219       UnsignedLongs.parseUnsignedLong("0", Character.MAX_RADIX + 1);
    220       fail();
    221     } catch (NumberFormatException expected) {
    222     }
    223 
    224     // The radix is used as an array index, so try a negative value.
    225     try {
    226       UnsignedLongs.parseUnsignedLong("0", -1);
    227       fail();
    228     } catch (NumberFormatException expected) {
    229     }
    230   }
    231 
    232   public void testToString() {
    233     String[] tests = {
    234         "ffffffffffffffff",
    235         "7fffffffffffffff",
    236         "ff1a618b7f65ea12",
    237         "5a4316b8c153ac4d",
    238         "6cf78a4b139a4e2a"
    239     };
    240     int[] bases = { 2, 5, 7, 8, 10, 16 };
    241     for (int base : bases) {
    242       for (String x : tests) {
    243         BigInteger xValue = new BigInteger(x, 16);
    244         long xLong = xValue.longValue(); // signed
    245         assertEquals(xValue.toString(base), UnsignedLongs.toString(xLong, base));
    246       }
    247     }
    248   }
    249 
    250   public void testJoin() {
    251     assertEquals("", UnsignedLongs.join(","));
    252     assertEquals("1", UnsignedLongs.join(",", 1));
    253     assertEquals("1,2", UnsignedLongs.join(",", 1, 2));
    254     assertEquals("18446744073709551615,9223372036854775808",
    255         UnsignedLongs.join(",", -1, Long.MIN_VALUE));
    256     assertEquals("123", UnsignedLongs.join("", 1, 2, 3));
    257     assertEquals("184467440737095516159223372036854775808",
    258         UnsignedLongs.join("", -1, Long.MIN_VALUE));
    259   }
    260 }
    261 
    262