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17 package com.google.common.collect;
18
19 import static com.google.common.truth.Truth.assertThat;
20
21 import com.google.common.annotations.GwtCompatible;
22 import com.google.common.annotations.GwtIncompatible;
23 import com.google.common.testing.NullPointerTester;
24
25 import junit.framework.TestCase;
26
27 import java.io.Serializable;
28 import java.util.Arrays;
29 import java.util.List;
30
31
32
33
34
35
36 @GwtCompatible(emulated = true)
37 public class ObjectArraysTest extends TestCase {
38
39 @GwtIncompatible("NullPointerTester")
40 public void testNullPointerExceptions() {
41 NullPointerTester tester = new NullPointerTester();
42 tester.testAllPublicStaticMethods(ObjectArrays.class);
43 }
44
45 @GwtIncompatible("ObjectArrays.newArray(Class, int)")
46 public void testNewArray_fromClass_Empty() {
47 String[] empty = ObjectArrays.newArray(String.class, 0);
48 assertEquals(String[].class, empty.getClass());
49 assertEquals(0, empty.length);
50 }
51
52 @GwtIncompatible("ObjectArrays.newArray(Class, int)")
53 public void testNewArray_fromClass_Nonempty() {
54 String[] array = ObjectArrays.newArray(String.class, 2);
55 assertEquals(String[].class, array.getClass());
56 assertEquals(2, array.length);
57 assertNull(array[0]);
58 }
59
60 @GwtIncompatible("ObjectArrays.newArray(Class, int)")
61 public void testNewArray_fromClass_OfArray() {
62 String[][] array = ObjectArrays.newArray(String[].class, 1);
63 assertEquals(String[][].class, array.getClass());
64 assertEquals(1, array.length);
65 assertNull(array[0]);
66 }
67
68 public void testNewArray_fromArray_Empty() {
69 String[] in = new String[0];
70 String[] empty = ObjectArrays.newArray(in, 0);
71 assertEquals(0, empty.length);
72 }
73
74 public void testNewArray_fromArray_Nonempty() {
75 String[] array = ObjectArrays.newArray(new String[0], 2);
76 assertEquals(String[].class, array.getClass());
77 assertEquals(2, array.length);
78 assertNull(array[0]);
79 }
80
81 public void testNewArray_fromArray_OfArray() {
82 String[][] array = ObjectArrays.newArray(new String[0][0], 1);
83 assertEquals(String[][].class, array.getClass());
84 assertEquals(1, array.length);
85 assertNull(array[0]);
86 }
87
88 @GwtIncompatible("ObjectArrays.concat(Object[], Object[], Class)")
89 public void testConcatEmptyEmpty() {
90 String[] result
91 = ObjectArrays.concat(new String[0], new String[0], String.class);
92 assertEquals(String[].class, result.getClass());
93 assertEquals(0, result.length);
94 }
95
96 @GwtIncompatible("ObjectArrays.concat(Object[], Object[], Class)")
97 public void testConcatEmptyNonempty() {
98 String[] result = ObjectArrays.concat(
99 new String[0], new String[] { "a", "b" }, String.class);
100 assertEquals(String[].class, result.getClass());
101 assertThat(result).asList().has().exactly("a", "b").inOrder();
102 }
103
104 @GwtIncompatible("ObjectArrays.concat(Object[], Object[], Class)")
105 public void testConcatNonemptyEmpty() {
106 String[] result = ObjectArrays.concat(
107 new String[] { "a", "b" }, new String[0], String.class);
108 assertEquals(String[].class, result.getClass());
109 assertThat(result).asList().has().exactly("a", "b").inOrder();
110 }
111
112 @GwtIncompatible("ObjectArrays.concat(Object[], Object[], Class)")
113 public void testConcatBasic() {
114 String[] result = ObjectArrays.concat(
115 new String[] { "a", "b" }, new String[] { "c", "d" }, String.class);
116 assertEquals(String[].class, result.getClass());
117 assertThat(result).asList().has().exactly("a", "b", "c", "d").inOrder();
118 }
119
120 @GwtIncompatible("ObjectArrays.concat(Object[], Object[], Class)")
121 public void testConcatWithMoreGeneralType() {
122 Serializable[] result
123 = ObjectArrays.concat(new String[0], new String[0], Serializable.class);
124 assertEquals(Serializable[].class, result.getClass());
125 }
126
127 public void testToArrayImpl1() {
128 doTestToArrayImpl1(Lists.<Integer>newArrayList());
129 doTestToArrayImpl1(Lists.newArrayList(1));
130 doTestToArrayImpl1(Lists.newArrayList(1, null, 3));
131 }
132
133 private void doTestToArrayImpl1(List<Integer> list) {
134 Object[] reference = list.toArray();
135 Object[] target = ObjectArrays.toArrayImpl(list);
136 assertEquals(reference.getClass(), target.getClass());
137 assertTrue(Arrays.equals(reference, target));
138 }
139
140 public void testToArrayImpl2() {
141 doTestToArrayImpl2(Lists.<Integer>newArrayList(), new Integer[0], false);
142 doTestToArrayImpl2(Lists.<Integer>newArrayList(), new Integer[1], true);
143
144 doTestToArrayImpl2(Lists.newArrayList(1), new Integer[0], false);
145 doTestToArrayImpl2(Lists.newArrayList(1), new Integer[1], true);
146 doTestToArrayImpl2(Lists.newArrayList(1), new Integer[] { 2, 3 }, true);
147
148 doTestToArrayImpl2(Lists.newArrayList(1, null, 3), new Integer[0], false);
149 doTestToArrayImpl2(Lists.newArrayList(1, null, 3), new Integer[2], false);
150 doTestToArrayImpl2(Lists.newArrayList(1, null, 3), new Integer[3], true);
151 }
152
153 private void doTestToArrayImpl2(List<Integer> list, Integer[] array1,
154 boolean expectModify) {
155 Integer[] starting = ObjectArrays.arraysCopyOf(array1, array1.length);
156 Integer[] array2 = ObjectArrays.arraysCopyOf(array1, array1.length);
157 Object[] reference = list.toArray(array1);
158
159 Object[] target = ObjectArrays.toArrayImpl(list, array2);
160
161 assertEquals(reference.getClass(), target.getClass());
162 assertTrue(Arrays.equals(reference, target));
163 assertTrue(Arrays.equals(reference, target));
164
165 Object[] expectedArray1 = expectModify ? reference : starting;
166 Object[] expectedArray2 = expectModify ? target : starting;
167 assertTrue(Arrays.equals(expectedArray1, array1));
168 assertTrue(Arrays.equals(expectedArray2, array2));
169 }
170
171 public void testPrependZeroElements() {
172 String[] result = ObjectArrays.concat("foo", new String[] {});
173 assertThat(result).asList().has().item("foo");
174 }
175
176 public void testPrependOneElement() {
177 String[] result = ObjectArrays.concat("foo", new String[] { "bar" });
178 assertThat(result).asList().has().exactly("foo", "bar").inOrder();
179 }
180
181 public void testPrependTwoElements() {
182 String[] result = ObjectArrays.concat("foo", new String[] { "bar", "baz" });
183 assertThat(result).asList().has().exactly("foo", "bar", "baz").inOrder();
184 }
185
186 public void testAppendZeroElements() {
187 String[] result = ObjectArrays.concat(new String[] {}, "foo");
188 assertThat(result).asList().has().item("foo");
189 }
190
191 public void testAppendOneElement() {
192 String[] result = ObjectArrays.concat(new String[] { "foo" }, "bar");
193 assertThat(result).asList().has().exactly("foo", "bar").inOrder();
194 }
195
196 public void testAppendTwoElements() {
197 String[] result = ObjectArrays.concat(new String[] { "foo", "bar" }, "baz");
198 assertThat(result).asList().has().exactly("foo", "bar", "baz").inOrder();
199 }
200
201 public void testEmptyArrayToEmpty() {
202 doTestNewArrayEquals(new Object[0], 0);
203 }
204
205 public void testEmptyArrayToNonEmpty() {
206 checkArrayEquals(new Long[5], ObjectArrays.newArray(new Long[0], 5));
207 }
208
209 public void testNonEmptyToShorter() {
210 checkArrayEquals(new String[9], ObjectArrays.newArray(new String[10], 9));
211 }
212
213 public void testNonEmptyToSameLength() {
214 doTestNewArrayEquals(new String[10], 10);
215 }
216
217 public void testNonEmptyToLonger() {
218 checkArrayEquals(new String[10],
219 ObjectArrays.newArray(new String[] { "a", "b", "c", "d", "e" }, 10));
220 }
221
222 private static void checkArrayEquals(Object[] expected, Object[] actual) {
223 assertTrue("expected(" + expected.getClass() + "): " + Arrays.toString(expected)
224 + " actual(" + actual.getClass() + "): " + Arrays.toString(actual),
225 arrayEquals(expected, actual));
226 }
227
228 private static boolean arrayEquals(Object[] array1, Object[] array2) {
229 assertSame(array1.getClass(), array2.getClass());
230 return Arrays.equals(array1, array2);
231 }
232
233 private static void doTestNewArrayEquals(Object[] expected, int length) {
234 checkArrayEquals(expected, ObjectArrays.newArray(expected, length));
235 }
236 }