1 /*
2 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 import java.io.ByteArrayInputStream;
25 import java.io.ByteArrayOutputStream;
26 import java.io.IOException;
27 import java.io.ObjectInputStream;
28 import java.io.ObjectOutputStream;
29 import java.io.Serializable;
30 import java.util.ArrayList;
31 import java.util.Arrays;
32 import java.util.Collections;
33 import java.util.Iterator;
34 import java.util.List;
35
36 import org.testng.annotations.DataProvider;
37 import org.testng.annotations.Test;
38
39 import static java.util.Arrays.asList;
40
41 import static org.testng.Assert.assertEquals;
42 import static org.testng.Assert.assertFalse;
43 import static org.testng.Assert.assertNotEquals;
44 import static org.testng.Assert.assertNotSame;
45 import static org.testng.Assert.assertSame;
46 import static org.testng.Assert.assertTrue;
47 import static org.testng.Assert.fail;
48
49 /*
50 * @test
51 * @bug 8048330
52 * @summary Test convenience static factory methods on List.
53 * @run testng ListFactories
54 */
55
56 public class ListFactories {
57
58 static final int NUM_STRINGS = 20; // should be larger than the largest fixed-arg overload
59 static final String[] stringArray;
60 static {
61 String[] sa = new String[NUM_STRINGS];
62 for (int i = 0; i < NUM_STRINGS; i++) {
63 sa[i] = String.valueOf((char)('a' + i));
64 }
65 stringArray = sa;
66 }
67
68 // returns array of [actual, expected]
69 static Object[] a(List<String> act, List<String> exp) {
70 return new Object[] { act, exp };
71 }
72
73 @DataProvider(name="empty")
74 public Iterator<Object[]> empty() {
75 return Collections.singletonList(
76 a(List.of(), asList())
77 ).iterator();
78 }
79
80 @DataProvider(name="nonempty")
81 public Iterator<Object[]> nonempty() {
82 return asList(
83 a(List.of("a"),
84 asList("a")),
85 a(List.of("a", "b"),
86 asList("a", "b")),
87 a(List.of("a", "b", "c"),
88 asList("a", "b", "c")),
89 a(List.of("a", "b", "c", "d"),
90 asList("a", "b", "c", "d")),
91 a(List.of("a", "b", "c", "d", "e"),
92 asList("a", "b", "c", "d", "e")),
93 a(List.of("a", "b", "c", "d", "e", "f"),
94 asList("a", "b", "c", "d", "e", "f")),
95 a(List.of("a", "b", "c", "d", "e", "f", "g"),
96 asList("a", "b", "c", "d", "e", "f", "g")),
97 a(List.of("a", "b", "c", "d", "e", "f", "g", "h"),
98 asList("a", "b", "c", "d", "e", "f", "g", "h")),
99 a(List.of("a", "b", "c", "d", "e", "f", "g", "h", "i"),
100 asList("a", "b", "c", "d", "e", "f", "g", "h", "i")),
101 a(List.of("a", "b", "c", "d", "e", "f", "g", "h", "i", "j"),
102 asList("a", "b", "c", "d", "e", "f", "g", "h", "i", "j")),
103 a(List.of(stringArray),
104 asList(stringArray))
105 ).iterator();
106 }
107
108 @DataProvider(name="sublists")
109 public Iterator<Object[]> sublists() {
110 return asList(
111 a(List.<String>of().subList(0,0),
112 asList()),
113 a(List.of("a").subList(0,0),
114 asList("a").subList(0,0)),
115 a(List.of("a", "b").subList(0,1),
116 asList("a", "b").subList(0,1)),
117 a(List.of("a", "b", "c").subList(1,3),
118 asList("a", "b", "c").subList(1,3)),
119 a(List.of("a", "b", "c", "d").subList(0,4),
120 asList("a", "b", "c", "d").subList(0,4)),
121 a(List.of("a", "b", "c", "d", "e").subList(0,3),
122 asList("a", "b", "c", "d", "e").subList(0,3)),
123 a(List.of("a", "b", "c", "d", "e", "f").subList(3, 5),
124 asList("a", "b", "c", "d", "e", "f").subList(3, 5)),
125 a(List.of("a", "b", "c", "d", "e", "f", "g").subList(0, 7),
126 asList("a", "b", "c", "d", "e", "f", "g").subList(0, 7)),
127 a(List.of("a", "b", "c", "d", "e", "f", "g", "h").subList(0, 0),
128 asList("a", "b", "c", "d", "e", "f", "g", "h").subList(0, 0)),
129 a(List.of("a", "b", "c", "d", "e", "f", "g", "h", "i").subList(4, 5),
130 asList("a", "b", "c", "d", "e", "f", "g", "h", "i").subList(4, 5)),
131 a(List.of("a", "b", "c", "d", "e", "f", "g", "h", "i", "j").subList(1,10),
132 asList("a", "b", "c", "d", "e", "f", "g", "h", "i", "j").subList(1,10)),
133 a(List.of(stringArray).subList(5, NUM_STRINGS),
134 asList(Arrays.copyOfRange(stringArray, 5, NUM_STRINGS)))
135 ).iterator();
136 }
137
138 @DataProvider(name="all")
139 public Iterator<Object[]> all() {
140 List<Object[]> all = new ArrayList<>();
141 empty().forEachRemaining(all::add);
142 nonempty().forEachRemaining(all::add);
143 sublists().forEachRemaining(all::add);
144 return all.iterator();
145 }
146
147 @DataProvider(name="nonsublists")
148 public Iterator<Object[]> nonsublists() {
149 List<Object[]> all = new ArrayList<>();
150 empty().forEachRemaining(all::add);
151 nonempty().forEachRemaining(all::add);
152 return all.iterator();
153 }
154
155 @Test(dataProvider="all", expectedExceptions=UnsupportedOperationException.class)
156 public void cannotAddLast(List<String> act, List<String> exp) {
157 act.add("x");
158 }
159
160 @Test(dataProvider="all", expectedExceptions=UnsupportedOperationException.class)
161 public void cannotAddFirst(List<String> act, List<String> exp) {
162 act.add(0, "x");
163 }
164
165 @Test(dataProvider="nonempty", expectedExceptions=UnsupportedOperationException.class)
166 public void cannotRemove(List<String> act, List<String> exp) {
167 act.remove(0);
168 }
169
170 @Test(dataProvider="nonempty", expectedExceptions=UnsupportedOperationException.class)
171 public void cannotSet(List<String> act, List<String> exp) {
172 act.set(0, "x");
173 }
174
175 @Test(dataProvider="all")
176 public void contentsMatch(List<String> act, List<String> exp) {
177 assertEquals(act, exp);
178 }
179
180 @Test(expectedExceptions=NullPointerException.class)
181 public void nullDisallowed1() {
182 List.of((Object)null); // force one-arg overload
183 }
184
185 @Test(expectedExceptions=NullPointerException.class)
186 public void nullDisallowed2a() {
187 List.of("a", null);
188 }
189
190 @Test(expectedExceptions=NullPointerException.class)
191 public void nullDisallowed2b() {
192 List.of(null, "b");
193 }
194
195 @Test(expectedExceptions=NullPointerException.class)
196 public void nullDisallowed3() {
197 List.of("a", "b", null);
198 }
199
200 @Test(expectedExceptions=NullPointerException.class)
201 public void nullDisallowed4() {
202 List.of("a", "b", "c", null);
203 }
204
205 @Test(expectedExceptions=NullPointerException.class)
206 public void nullDisallowed5() {
207 List.of("a", "b", "c", "d", null);
208 }
209
210 @Test(expectedExceptions=NullPointerException.class)
211 public void nullDisallowed6() {
212 List.of("a", "b", "c", "d", "e", null);
213 }
214
215 @Test(expectedExceptions=NullPointerException.class)
216 public void nullDisallowed7() {
217 List.of("a", "b", "c", "d", "e", "f", null);
218 }
219
220 @Test(expectedExceptions=NullPointerException.class)
221 public void nullDisallowed8() {
222 List.of("a", "b", "c", "d", "e", "f", "g", null);
223 }
224
225 @Test(expectedExceptions=NullPointerException.class)
226 public void nullDisallowed9() {
227 List.of("a", "b", "c", "d", "e", "f", "g", "h", null);
228 }
229
230 @Test(expectedExceptions=NullPointerException.class)
231 public void nullDisallowed10() {
232 List.of("a", "b", "c", "d", "e", "f", "g", "h", "i", null);
233 }
234
235 @Test(expectedExceptions=NullPointerException.class)
236 public void nullDisallowedN() {
237 String[] array = stringArray.clone();
238 array[0] = null;
239 List.of(array);
240 }
241
242 @Test(expectedExceptions=NullPointerException.class)
243 public void nullArrayDisallowed() {
244 List.of((Object[])null);
245 }
246
247 @Test
248 public void ensureArrayCannotModifyList() {
249 String[] array = stringArray.clone();
250 List<String> list = List.of(array);
251 array[0] = "xyzzy";
252 assertEquals(list, Arrays.asList(stringArray));
253 }
254
255 // List.of().subList views should not be Serializable
256 @Test(dataProvider="sublists")
257 public void isNotSerializable(List<String> act, List<String> exp) {
258 assertFalse(act instanceof Serializable);
259 }
260
261 // ... but List.of() should be
262 @Test(dataProvider="nonsublists")
263 public void serialEquality(List<String> act, List<String> exp) {
264 // assume that act.equals(exp) tested elsewhere
265 List<String> copy = serialClone(act);
266 assertEquals(act, copy);
267 assertEquals(copy, exp);
268 }
269
270 @SuppressWarnings("unchecked")
271 static <T> T serialClone(T obj) {
272 try {
273 ByteArrayOutputStream baos = new ByteArrayOutputStream();
274 try (ObjectOutputStream oos = new ObjectOutputStream(baos)) {
275 oos.writeObject(obj);
276 }
277 ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
278 ObjectInputStream ois = new ObjectInputStream(bais);
279 return (T) ois.readObject();
280 } catch (IOException | ClassNotFoundException e) {
281 throw new AssertionError(e);
282 }
283 }
284
285 List<Integer> genList() {
286 return new ArrayList<>(Arrays.asList(1, 2, 3));
287 }
288
289 @Test
290 public void copyOfResultsEqual() {
291 List<Integer> orig = genList();
292 List<Integer> copy = List.copyOf(orig);
293
294 assertEquals(orig, copy);
295 assertEquals(copy, orig);
296 }
297
298 @Test
299 public void copyOfModifiedUnequal() {
300 List<Integer> orig = genList();
301 List<Integer> copy = List.copyOf(orig);
302 orig.add(4);
303
304 assertNotEquals(orig, copy);
305 assertNotEquals(copy, orig);
306 }
307
308 @Test
309 public void copyOfIdentity() {
310 List<Integer> orig = genList();
311 List<Integer> copy1 = List.copyOf(orig);
312 List<Integer> copy2 = List.copyOf(copy1);
313
314 assertNotSame(orig, copy1);
315 assertSame(copy1, copy2);
316 }
317
318 @Test(expectedExceptions=NullPointerException.class)
319 public void copyOfRejectsNullCollection() {
320 List<Integer> list = List.copyOf(null);
321 }
322
323 @Test(expectedExceptions=NullPointerException.class)
324 public void copyOfRejectsNullElements() {
325 List<Integer> list = List.copyOf(Arrays.asList(1, null, 3));
326 }
327 }