1/*
2 * Copyright (C) 2008 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.primitives;
18
19import com.google.common.annotations.GwtCompatible;
20import com.google.common.annotations.GwtIncompatible;
21import com.google.common.collect.testing.Helpers;
22import com.google.common.testing.NullPointerTester;
23import com.google.common.testing.SerializableTester;
24
25import junit.framework.TestCase;
26
27import java.util.Arrays;
28import java.util.Collection;
29import java.util.Collections;
30import java.util.Comparator;
31import java.util.List;
32import java.util.Random;
33
34/**
35 * Unit test for {@link Longs}.
36 *
37 * @author Kevin Bourrillion
38 */
39@GwtCompatible(emulated = true)
40@SuppressWarnings("cast") // redundant casts are intentional and harmless
41public class LongsTest extends TestCase {
42  private static final long[] EMPTY = {};
43  private static final long[] ARRAY1 = {(long) 1};
44  private static final long[] ARRAY234
45      = {(long) 2, (long) 3, (long) 4};
46
47  private static final long LEAST = Long.MIN_VALUE;
48  private static final long GREATEST = Long.MAX_VALUE;
49
50  private static final long[] VALUES =
51      { LEAST, (long) -1, (long) 0, (long) 1, GREATEST };
52
53  @GwtIncompatible("Long.hashCode returns different values in GWT.")
54  public void testHashCode() {
55    for (long value : VALUES) {
56      assertEquals("hashCode for " + value,
57          ((Long) value).hashCode(), Longs.hashCode(value));
58    }
59  }
60
61  public void testCompare() {
62    for (long x : VALUES) {
63      for (long y : VALUES) {
64        // note: spec requires only that the sign is the same
65        assertEquals(x + ", " + y,
66                     Long.valueOf(x).compareTo(y),
67                     Longs.compare(x, y));
68      }
69    }
70  }
71
72  public void testContains() {
73    assertFalse(Longs.contains(EMPTY, (long) 1));
74    assertFalse(Longs.contains(ARRAY1, (long) 2));
75    assertFalse(Longs.contains(ARRAY234, (long) 1));
76    assertTrue(Longs.contains(new long[] {(long) -1}, (long) -1));
77    assertTrue(Longs.contains(ARRAY234, (long) 2));
78    assertTrue(Longs.contains(ARRAY234, (long) 3));
79    assertTrue(Longs.contains(ARRAY234, (long) 4));
80  }
81
82  public void testIndexOf() {
83    assertEquals(-1, Longs.indexOf(EMPTY, (long) 1));
84    assertEquals(-1, Longs.indexOf(ARRAY1, (long) 2));
85    assertEquals(-1, Longs.indexOf(ARRAY234, (long) 1));
86    assertEquals(0, Longs.indexOf(
87        new long[] {(long) -1}, (long) -1));
88    assertEquals(0, Longs.indexOf(ARRAY234, (long) 2));
89    assertEquals(1, Longs.indexOf(ARRAY234, (long) 3));
90    assertEquals(2, Longs.indexOf(ARRAY234, (long) 4));
91    assertEquals(1, Longs.indexOf(
92        new long[] { (long) 2, (long) 3, (long) 2, (long) 3 },
93        (long) 3));
94  }
95
96  public void testIndexOf_arrayTarget() {
97    assertEquals(0, Longs.indexOf(EMPTY, EMPTY));
98    assertEquals(0, Longs.indexOf(ARRAY234, EMPTY));
99    assertEquals(-1, Longs.indexOf(EMPTY, ARRAY234));
100    assertEquals(-1, Longs.indexOf(ARRAY234, ARRAY1));
101    assertEquals(-1, Longs.indexOf(ARRAY1, ARRAY234));
102    assertEquals(0, Longs.indexOf(ARRAY1, ARRAY1));
103    assertEquals(0, Longs.indexOf(ARRAY234, ARRAY234));
104    assertEquals(0, Longs.indexOf(
105        ARRAY234, new long[] { (long) 2, (long) 3 }));
106    assertEquals(1, Longs.indexOf(
107        ARRAY234, new long[] { (long) 3, (long) 4 }));
108    assertEquals(1, Longs.indexOf(ARRAY234, new long[] { (long) 3 }));
109    assertEquals(2, Longs.indexOf(ARRAY234, new long[] { (long) 4 }));
110    assertEquals(1, Longs.indexOf(new long[] { (long) 2, (long) 3,
111        (long) 3, (long) 3, (long) 3 },
112        new long[] { (long) 3 }
113    ));
114    assertEquals(2, Longs.indexOf(
115        new long[] { (long) 2, (long) 3, (long) 2,
116            (long) 3, (long) 4, (long) 2, (long) 3},
117        new long[] { (long) 2, (long) 3, (long) 4}
118    ));
119    assertEquals(1, Longs.indexOf(
120        new long[] { (long) 2, (long) 2, (long) 3,
121            (long) 4, (long) 2, (long) 3, (long) 4},
122        new long[] { (long) 2, (long) 3, (long) 4}
123    ));
124    assertEquals(-1, Longs.indexOf(
125        new long[] { (long) 4, (long) 3, (long) 2},
126        new long[] { (long) 2, (long) 3, (long) 4}
127    ));
128  }
129
130  public void testLastIndexOf() {
131    assertEquals(-1, Longs.lastIndexOf(EMPTY, (long) 1));
132    assertEquals(-1, Longs.lastIndexOf(ARRAY1, (long) 2));
133    assertEquals(-1, Longs.lastIndexOf(ARRAY234, (long) 1));
134    assertEquals(0, Longs.lastIndexOf(
135        new long[] {(long) -1}, (long) -1));
136    assertEquals(0, Longs.lastIndexOf(ARRAY234, (long) 2));
137    assertEquals(1, Longs.lastIndexOf(ARRAY234, (long) 3));
138    assertEquals(2, Longs.lastIndexOf(ARRAY234, (long) 4));
139    assertEquals(3, Longs.lastIndexOf(
140        new long[] { (long) 2, (long) 3, (long) 2, (long) 3 },
141        (long) 3));
142  }
143
144  public void testMax_noArgs() {
145    try {
146      Longs.max();
147      fail();
148    } catch (IllegalArgumentException expected) {
149    }
150  }
151
152  public void testMax() {
153    assertEquals(LEAST, Longs.max(LEAST));
154    assertEquals(GREATEST, Longs.max(GREATEST));
155    assertEquals((long) 9, Longs.max(
156        (long) 8, (long) 6, (long) 7,
157        (long) 5, (long) 3, (long) 0, (long) 9));
158  }
159
160  public void testMin_noArgs() {
161    try {
162      Longs.min();
163      fail();
164    } catch (IllegalArgumentException expected) {
165    }
166  }
167
168  public void testMin() {
169    assertEquals(LEAST, Longs.min(LEAST));
170    assertEquals(GREATEST, Longs.min(GREATEST));
171    assertEquals((long) 0, Longs.min(
172        (long) 8, (long) 6, (long) 7,
173        (long) 5, (long) 3, (long) 0, (long) 9));
174  }
175
176  public void testConcat() {
177    assertTrue(Arrays.equals(EMPTY, Longs.concat()));
178    assertTrue(Arrays.equals(EMPTY, Longs.concat(EMPTY)));
179    assertTrue(Arrays.equals(EMPTY, Longs.concat(EMPTY, EMPTY, EMPTY)));
180    assertTrue(Arrays.equals(ARRAY1, Longs.concat(ARRAY1)));
181    assertNotSame(ARRAY1, Longs.concat(ARRAY1));
182    assertTrue(Arrays.equals(ARRAY1, Longs.concat(EMPTY, ARRAY1, EMPTY)));
183    assertTrue(Arrays.equals(
184        new long[] {(long) 1, (long) 1, (long) 1},
185        Longs.concat(ARRAY1, ARRAY1, ARRAY1)));
186    assertTrue(Arrays.equals(
187        new long[] {(long) 1, (long) 2, (long) 3, (long) 4},
188        Longs.concat(ARRAY1, ARRAY234)));
189  }
190
191  @GwtIncompatible("Longs.toByteArray")
192  public void testToByteArray() {
193    assertTrue(Arrays.equals(
194        new byte[] {0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19},
195        Longs.toByteArray(0x1213141516171819L)));
196    assertTrue(Arrays.equals(
197        new byte[] {
198            (byte) 0xFF, (byte) 0xEE, (byte) 0xDD, (byte) 0xCC,
199            (byte) 0xBB, (byte) 0xAA, (byte) 0x99, (byte) 0x88},
200        Longs.toByteArray(0xFFEEDDCCBBAA9988L)));
201  }
202
203  @GwtIncompatible("Longs.fromByteArray")
204  public void testFromByteArray() {
205    assertEquals(0x1213141516171819L, Longs.fromByteArray(
206        new byte[] {0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x33}));
207    assertEquals(0xFFEEDDCCBBAA9988L, Longs.fromByteArray(
208        new byte[] {
209            (byte) 0xFF, (byte) 0xEE, (byte) 0xDD, (byte) 0xCC,
210            (byte) 0xBB, (byte) 0xAA, (byte) 0x99, (byte) 0x88}));
211
212    try {
213      Longs.fromByteArray(new byte[Longs.BYTES - 1]);
214      fail();
215    } catch (IllegalArgumentException expected) {
216    }
217  }
218
219  @GwtIncompatible("Longs.fromBytes")
220  public void testFromBytes() {
221    assertEquals(0x1213141516171819L, Longs.fromBytes(
222        (byte) 0x12, (byte) 0x13, (byte) 0x14, (byte) 0x15,
223        (byte) 0x16, (byte) 0x17, (byte) 0x18, (byte) 0x19));
224    assertEquals(0xFFEEDDCCBBAA9988L, Longs.fromBytes(
225        (byte) 0xFF, (byte) 0xEE, (byte) 0xDD, (byte) 0xCC,
226        (byte) 0xBB, (byte) 0xAA, (byte) 0x99, (byte) 0x88));
227  }
228
229  @GwtIncompatible("Longs.fromByteArray, Longs.toByteArray")
230  public void testByteArrayRoundTrips() {
231    Random r = new Random(5);
232    byte[] b = new byte[Longs.BYTES];
233
234    // total overkill, but, it takes 0.1 sec so why not...
235    for (int i = 0; i < 10000; i++) {
236      long num = r.nextLong();
237      assertEquals(num, Longs.fromByteArray(Longs.toByteArray(num)));
238
239      r.nextBytes(b);
240      long value = Longs.fromByteArray(b);
241      assertTrue("" + value, Arrays.equals(b, Longs.toByteArray(value)));
242    }
243  }
244
245  public void testEnsureCapacity() {
246    assertSame(EMPTY, Longs.ensureCapacity(EMPTY, 0, 1));
247    assertSame(ARRAY1, Longs.ensureCapacity(ARRAY1, 0, 1));
248    assertSame(ARRAY1, Longs.ensureCapacity(ARRAY1, 1, 1));
249    assertTrue(Arrays.equals(
250        new long[] {(long) 1, (long) 0, (long) 0},
251        Longs.ensureCapacity(ARRAY1, 2, 1)));
252  }
253
254  public void testEnsureCapacity_fail() {
255    try {
256      Longs.ensureCapacity(ARRAY1, -1, 1);
257      fail();
258    } catch (IllegalArgumentException expected) {
259    }
260    try {
261      // notice that this should even fail when no growth was needed
262      Longs.ensureCapacity(ARRAY1, 1, -1);
263      fail();
264    } catch (IllegalArgumentException expected) {
265    }
266  }
267
268  public void testJoin() {
269    assertEquals("", Longs.join(",", EMPTY));
270    assertEquals("1", Longs.join(",", ARRAY1));
271    assertEquals("1,2", Longs.join(",", (long) 1, (long) 2));
272    assertEquals("123",
273        Longs.join("", (long) 1, (long) 2, (long) 3));
274  }
275
276  public void testLexicographicalComparator() {
277    List<long[]> ordered = Arrays.asList(
278        new long[] {},
279        new long[] {LEAST},
280        new long[] {LEAST, LEAST},
281        new long[] {LEAST, (long) 1},
282        new long[] {(long) 1},
283        new long[] {(long) 1, LEAST},
284        new long[] {GREATEST, GREATEST - (long) 1},
285        new long[] {GREATEST, GREATEST},
286        new long[] {GREATEST, GREATEST, GREATEST});
287
288    Comparator<long[]> comparator = Longs.lexicographicalComparator();
289    Helpers.testComparator(comparator, ordered);
290  }
291
292  @GwtIncompatible("SerializableTester")
293  public void testLexicographicalComparatorSerializable() {
294    Comparator<long[]> comparator = Longs.lexicographicalComparator();
295    assertSame(comparator, SerializableTester.reserialize(comparator));
296  }
297
298  public void testToArray() {
299    // need explicit type parameter to avoid javac warning!?
300    List<Long> none = Arrays.<Long>asList();
301    assertTrue(Arrays.equals(EMPTY, Longs.toArray(none)));
302
303    List<Long> one = Arrays.asList((long) 1);
304    assertTrue(Arrays.equals(ARRAY1, Longs.toArray(one)));
305
306    long[] array = {(long) 0, (long) 1, 0x0FF1C1AL};
307
308    List<Long> three = Arrays.asList((long) 0, (long) 1, 0x0FF1C1AL);
309    assertTrue(Arrays.equals(array, Longs.toArray(three)));
310
311    assertTrue(Arrays.equals(array, Longs.toArray(Longs.asList(array))));
312  }
313
314  public void testToArray_threadSafe() {
315    for (int delta : new int[] { +1, 0, -1 }) {
316      for (int i = 0; i < VALUES.length; i++) {
317        List<Long> list = Longs.asList(VALUES).subList(0, i);
318        Collection<Long> misleadingSize =
319            Helpers.misleadingSizeCollection(delta);
320        misleadingSize.addAll(list);
321        long[] arr = Longs.toArray(misleadingSize);
322        assertEquals(i, arr.length);
323        for (int j = 0; j < i; j++) {
324          assertEquals(VALUES[j], arr[j]);
325        }
326      }
327    }
328  }
329
330  public void testToArray_withNull() {
331    List<Long> list = Arrays.asList((long) 0, (long) 1, null);
332    try {
333      Longs.toArray(list);
334      fail();
335    } catch (NullPointerException expected) {
336    }
337  }
338
339  public void testAsList_isAView() {
340    long[] array = {(long) 0, (long) 1};
341    List<Long> list = Longs.asList(array);
342    list.set(0, (long) 2);
343    assertTrue(Arrays.equals(new long[] {(long) 2, (long) 1}, array));
344    array[1] = (long) 3;
345    assertEquals(Arrays.asList((long) 2, (long) 3), list);
346  }
347
348  public void testAsList_toArray_roundTrip() {
349    long[] array = { (long) 0, (long) 1, (long) 2 };
350    List<Long> list = Longs.asList(array);
351    long[] newArray = Longs.toArray(list);
352
353    // Make sure it returned a copy
354    list.set(0, (long) 4);
355    assertTrue(Arrays.equals(
356        new long[] { (long) 0, (long) 1, (long) 2 }, newArray));
357    newArray[1] = (long) 5;
358    assertEquals((long) 1, (long) list.get(1));
359  }
360
361  // This test stems from a real bug found by andrewk
362  public void testAsList_subList_toArray_roundTrip() {
363    long[] array = { (long) 0, (long) 1, (long) 2, (long) 3 };
364    List<Long> list = Longs.asList(array);
365    assertTrue(Arrays.equals(new long[] { (long) 1, (long) 2 },
366        Longs.toArray(list.subList(1, 3))));
367    assertTrue(Arrays.equals(new long[] {},
368        Longs.toArray(list.subList(2, 2))));
369  }
370
371  public void testAsListEmpty() {
372    assertSame(Collections.emptyList(), Longs.asList(EMPTY));
373  }
374
375  @GwtIncompatible("NullPointerTester")
376  public void testNulls() throws Exception {
377    NullPointerTester tester = new NullPointerTester();
378    tester.setDefault(long[].class, new long[0]);
379    tester.testAllPublicStaticMethods(Longs.class);
380  }
381}
382