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
15package com.google.common.primitives;
16
17import com.google.common.annotations.GwtCompatible;
18import com.google.common.annotations.GwtIncompatible;
19import com.google.common.collect.testing.Helpers;
20import com.google.common.testing.NullPointerTester;
21
22import junit.framework.TestCase;
23
24import java.util.Arrays;
25import java.util.Comparator;
26import java.util.List;
27import java.util.Random;
28
29/**
30 * Tests for UnsignedInts
31 *
32 * @author Louis Wasserman
33 */
34@GwtCompatible(emulated = true)
35public class UnsignedIntsTest extends TestCase {
36  private static final long[] UNSIGNED_INTS = {
37      0L,
38      1L,
39      2L,
40      3L,
41      0x12345678L,
42      0x5a4316b8L,
43      0x6cf78a4bL,
44      0xff1a618bL,
45      0xfffffffdL,
46      0xfffffffeL,
47      0xffffffffL};
48
49  private static final int LEAST = (int) 0L;
50  private static final int GREATEST = (int) 0xffffffffL;
51
52  public void testToLong() {
53    for (long a : UNSIGNED_INTS) {
54      assertEquals(a, UnsignedInts.toLong((int) a));
55    }
56  }
57
58  public void testCompare() {
59    for (long a : UNSIGNED_INTS) {
60      for (long b : UNSIGNED_INTS) {
61        int cmpAsLongs = Longs.compare(a, b);
62        int cmpAsUInt = UnsignedInts.compare((int) a, (int) b);
63        assertEquals(Integer.signum(cmpAsLongs), Integer.signum(cmpAsUInt));
64      }
65    }
66  }
67
68  public void testMax_noArgs() {
69    try {
70      UnsignedInts.max();
71      fail();
72    } catch (IllegalArgumentException expected) {
73    }
74  }
75
76  public void testMax() {
77    assertEquals(LEAST, UnsignedInts.max(LEAST));
78    assertEquals(GREATEST, UnsignedInts.max(GREATEST));
79    assertEquals((int) 0xff1a618bL, UnsignedInts.max(
80        (int) 8L, (int) 6L, (int) 7L,
81        (int) 0x12345678L, (int) 0x5a4316b8L,
82        (int) 0xff1a618bL, (int) 0L));
83  }
84
85  public void testMin_noArgs() {
86    try {
87      UnsignedInts.min();
88      fail();
89    } catch (IllegalArgumentException expected) {
90    }
91  }
92
93  public void testMin() {
94    assertEquals(LEAST, UnsignedInts.min(LEAST));
95    assertEquals(GREATEST, UnsignedInts.min(GREATEST));
96    assertEquals((int) 0L, UnsignedInts.min(
97        (int) 8L, (int) 6L, (int) 7L,
98        (int) 0x12345678L, (int) 0x5a4316b8L,
99        (int) 0xff1a618bL, (int) 0L));
100  }
101
102  public void testLexicographicalComparator() {
103    List<int[]> ordered = Arrays.asList(
104        new int[] {},
105        new int[] {LEAST},
106        new int[] {LEAST, LEAST},
107        new int[] {LEAST, (int) 1L},
108        new int[] {(int) 1L},
109        new int[] {(int) 1L, LEAST},
110        new int[] {GREATEST, (GREATEST - (int) 1L)},
111        new int[] {GREATEST, GREATEST},
112        new int[] {GREATEST, GREATEST, GREATEST}
113        );
114
115    Comparator<int[]> comparator = UnsignedInts.lexicographicalComparator();
116    Helpers.testComparator(comparator, ordered);
117  }
118
119  public void testDivide() {
120    for (long a : UNSIGNED_INTS) {
121      for (long b : UNSIGNED_INTS) {
122        try {
123          assertEquals((int) (a / b), UnsignedInts.divide((int) a, (int) b));
124          assertFalse(b == 0);
125        } catch (ArithmeticException e) {
126          assertEquals(0, b);
127        }
128      }
129    }
130  }
131
132  public void testRemainder() {
133    for (long a : UNSIGNED_INTS) {
134      for (long b : UNSIGNED_INTS) {
135        try {
136          assertEquals((int) (a % b), UnsignedInts.remainder((int) a, (int) b));
137          assertFalse(b == 0);
138        } catch (ArithmeticException e) {
139          assertEquals(0, b);
140        }
141      }
142    }
143  }
144
145  @GwtIncompatible("Too slow in GWT (~3min fully optimized)")
146  public void testDivideRemainderEuclideanProperty() {
147    // Use a seed so that the test is deterministic:
148    Random r = new Random(0L);
149    for (int i = 0; i < 1000000; i++) {
150      int dividend = r.nextInt();
151      int divisor = r.nextInt();
152      // Test that the Euclidean property is preserved:
153      assertTrue(dividend
154          - (divisor * UnsignedInts.divide(dividend, divisor) + UnsignedInts.remainder(dividend,
155              divisor)) == 0);
156    }
157  }
158
159  public void testParseInt() {
160    try {
161      for (long a : UNSIGNED_INTS) {
162        assertEquals((int) a, UnsignedInts.parseUnsignedInt(Long.toString(a)));
163      }
164    } catch (NumberFormatException e) {
165      fail(e.getMessage());
166    }
167
168    try {
169      UnsignedInts.parseUnsignedInt(Long.toString(1L << 32));
170      fail("Expected NumberFormatException");
171    } catch (NumberFormatException expected) {}
172  }
173
174  public void testParseIntWithRadix() throws NumberFormatException {
175    for (long a : UNSIGNED_INTS) {
176      for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
177        assertEquals((int) a, UnsignedInts.parseUnsignedInt(Long.toString(a, radix), radix));
178      }
179    }
180
181    // loops through all legal radix values.
182    for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
183      // tests can successfully parse a number string with this radix.
184      String maxAsString = Long.toString((1L << 32) - 1, radix);
185      assertEquals(-1, UnsignedInts.parseUnsignedInt(maxAsString, radix));
186
187      try {
188        // tests that we get exception whre an overflow would occur.
189        long overflow = 1L << 32;
190        String overflowAsString = Long.toString(overflow, radix);
191        UnsignedInts.parseUnsignedInt(overflowAsString, radix);
192        fail();
193      } catch (NumberFormatException expected) {}
194    }
195  }
196
197  public void testParseIntThrowsExceptionForInvalidRadix() {
198    // Valid radix values are Character.MIN_RADIX to Character.MAX_RADIX,
199    // inclusive.
200    try {
201      UnsignedInts.parseUnsignedInt("0", Character.MIN_RADIX - 1);
202      fail();
203    } catch (NumberFormatException expected) {}
204
205    try {
206      UnsignedInts.parseUnsignedInt("0", Character.MAX_RADIX + 1);
207      fail();
208    } catch (NumberFormatException expected) {}
209
210    // The radix is used as an array index, so try a negative value.
211    try {
212      UnsignedInts.parseUnsignedInt("0", -1);
213      fail();
214    } catch (NumberFormatException expected) {}
215  }
216
217  public void testDecodeInt() {
218    assertEquals(0xffffffff, UnsignedInts.decode("0xffffffff"));
219    assertEquals(01234567, UnsignedInts.decode("01234567")); // octal
220    assertEquals(0x12345678, UnsignedInts.decode("#12345678"));
221    assertEquals(76543210, UnsignedInts.decode("76543210"));
222    assertEquals(0x13579135, UnsignedInts.decode("0x13579135"));
223    assertEquals(0x13579135, UnsignedInts.decode("0X13579135"));
224    assertEquals(0, UnsignedInts.decode("0"));
225  }
226
227  public void testDecodeIntFails() {
228    try {
229      // One more than maximum value
230      UnsignedInts.decode("0xfffffffff");
231      fail();
232    } catch (NumberFormatException expected) {
233    }
234
235    try {
236      UnsignedInts.decode("-5");
237      fail();
238    } catch (NumberFormatException expected) {
239    }
240
241    try {
242      UnsignedInts.decode("-0x5");
243      fail();
244    } catch (NumberFormatException expected) {
245    }
246
247    try {
248      UnsignedInts.decode("-05");
249      fail();
250    } catch (NumberFormatException expected) {
251    }
252  }
253
254  public void testToString() {
255    int[] bases = {2, 5, 7, 8, 10, 16};
256    for (long a : UNSIGNED_INTS) {
257      for (int base : bases) {
258        assertEquals(UnsignedInts.toString((int) a, base), Long.toString(a, base));
259      }
260    }
261  }
262
263  public void testJoin() {
264    assertEquals("", join());
265    assertEquals("1", join(1));
266    assertEquals("1,2", join(1, 2));
267    assertEquals("4294967295,2147483648", join(-1, Integer.MIN_VALUE));
268
269    assertEquals("123", UnsignedInts.join("", 1, 2, 3));
270  }
271
272  private static String join(int... values) {
273    return UnsignedInts.join(",", values);
274  }
275
276  @GwtIncompatible("NullPointerTester")
277  public void testNulls() {
278    new NullPointerTester().testAllPublicStaticMethods(UnsignedInts.class);
279  }
280}
281