1 |
dl |
1.1 |
/* |
2 |
|
|
* Written by Josh Bloch of Google Inc. and released to the public domain, |
3 |
jsr166 |
1.7 |
* as explained at http://creativecommons.org/publicdomain/zero/1.0/. |
4 |
dl |
1.1 |
*/ |
5 |
|
|
|
6 |
jsr166 |
1.10 |
import java.io.*; |
7 |
dl |
1.1 |
import java.util.*; |
8 |
|
|
|
9 |
|
|
/** |
10 |
|
|
* Interface-based Deque tester. This test currently makes three |
11 |
|
|
* assumptions about the implementation under test: |
12 |
|
|
* |
13 |
|
|
* 1) It has no size limitation. |
14 |
|
|
* 2) It implements Serializable. |
15 |
|
|
* 3) It has a conventional (Collection) constructor. |
16 |
|
|
* |
17 |
|
|
* All of these assumptions could be relaxed. |
18 |
|
|
*/ |
19 |
|
|
public class DequeBash { |
20 |
|
|
static int seed = 7; |
21 |
|
|
static int nextTail = 0; |
22 |
|
|
static int nextHead = -1; |
23 |
|
|
static int size() { return nextTail - nextHead - 1; } |
24 |
|
|
|
25 |
dl |
1.13 |
static int random() { |
26 |
|
|
int r = seed; |
27 |
|
|
r ^= r << 13; // xorshift |
28 |
|
|
r ^= r >>> 17; |
29 |
|
|
return seed = r ^ (r << 5); |
30 |
dl |
1.1 |
} |
31 |
|
|
|
32 |
dl |
1.13 |
static int random(int bound) { |
33 |
|
|
return (random() & 0x7fffffff) % bound; |
34 |
dl |
1.1 |
} |
35 |
jsr166 |
1.14 |
|
36 |
jsr166 |
1.9 |
public static void main(String[] args) throws Exception { |
37 |
jsr166 |
1.6 |
Class<?> cls = Class.forName(args[0]); |
38 |
dl |
1.13 |
long startTime = System.nanoTime(); |
39 |
|
|
for (int j = 0; j < 200; ++j) { |
40 |
jsr166 |
1.6 |
@SuppressWarnings("unchecked") |
41 |
jsr166 |
1.15 |
Deque<Integer> deque = |
42 |
|
|
(Deque<Integer>) cls.getConstructor().newInstance(); |
43 |
dl |
1.1 |
nextTail = 0; |
44 |
|
|
nextHead = -1; |
45 |
dl |
1.13 |
mainTest(deque, (random() & ((1 << 20) - 1))); |
46 |
dl |
1.1 |
if (deque.isEmpty()) System.out.print(" "); |
47 |
dl |
1.13 |
if ((j % 10) == 9) System.out.print("."); |
48 |
dl |
1.1 |
} |
49 |
dl |
1.13 |
long now = System.nanoTime(); |
50 |
|
|
long elapsedTimeMillis = (now - startTime) / (1000L * 1000L); |
51 |
|
|
System.out.printf("\ntotal time %d ms\n", elapsedTimeMillis); |
52 |
jsr166 |
1.14 |
|
53 |
dl |
1.1 |
} |
54 |
|
|
|
55 |
|
|
static void mainTest(Deque<Integer> deque, int n) throws Exception { |
56 |
|
|
/* |
57 |
|
|
* Perform a random sequence of operations, keeping contiguous |
58 |
|
|
* sequence of integers on the deque. |
59 |
|
|
*/ |
60 |
|
|
for (int i = 0; i < n; i++) { |
61 |
|
|
sizeTests(deque); |
62 |
|
|
randomOp(deque); |
63 |
|
|
|
64 |
|
|
// Test iterator occasionally |
65 |
dl |
1.2 |
if ((i & 1023) == 0) { |
66 |
dl |
1.1 |
testIter(deque); |
67 |
dl |
1.2 |
testDescendingIter(deque); |
68 |
|
|
} |
69 |
dl |
1.1 |
|
70 |
|
|
// Test serialization and copying |
71 |
|
|
if ((i & 4095) == 0) { |
72 |
jsr166 |
1.6 |
testEqual(deque, serialClone(deque)); |
73 |
|
|
testEqual(deque, copyConstructorClone(deque)); |
74 |
dl |
1.1 |
} |
75 |
jsr166 |
1.3 |
|
76 |
dl |
1.1 |
// Test fancy removal stuff once in a blue moon |
77 |
|
|
if ((i & 8191) == 0) |
78 |
|
|
testRemove(deque); |
79 |
jsr166 |
1.8 |
} |
80 |
dl |
1.1 |
|
81 |
|
|
// Stupid tests for clear, toString |
82 |
|
|
deque.clear(); |
83 |
|
|
testEmpty(deque); |
84 |
|
|
Collection<Integer> c = Arrays.asList(1, 2, 3); |
85 |
|
|
deque.addAll(c); |
86 |
|
|
if (!deque.toString().equals("[1, 2, 3]")) |
87 |
|
|
throw new Exception("Deque.toString(): " + deque.toString()); |
88 |
|
|
} |
89 |
|
|
|
90 |
jsr166 |
1.3 |
static void testIter(Deque<Integer> deque) throws Exception { |
91 |
dl |
1.1 |
int next = nextHead + 1; |
92 |
|
|
int count = 0; |
93 |
|
|
for (int j : deque) { |
94 |
|
|
if (j != next++) |
95 |
|
|
throw new Exception("Element "+ j + " != " + (next-1)); |
96 |
|
|
count++; |
97 |
|
|
} |
98 |
|
|
if (count != size()) |
99 |
|
|
throw new Exception("Count " + count + " != " + size()); |
100 |
|
|
} |
101 |
|
|
|
102 |
jsr166 |
1.3 |
static void testDescendingIter(Deque<Integer> deque) throws Exception { |
103 |
dl |
1.2 |
int next = deque.size() + nextHead; |
104 |
|
|
int count = 0; |
105 |
|
|
for (Iterator<Integer> it = deque.descendingIterator(); it.hasNext();) { |
106 |
|
|
int j = it.next(); |
107 |
|
|
if (j != next--) |
108 |
|
|
throw new Exception("Element "+ j + " != " + (next-1)); |
109 |
|
|
count++; |
110 |
|
|
} |
111 |
|
|
if (count != size()) |
112 |
|
|
throw new Exception("Count " + count + " != " + size()); |
113 |
|
|
} |
114 |
|
|
|
115 |
dl |
1.1 |
static void sizeTests(Deque<Integer> deque) throws Exception { |
116 |
|
|
if (deque.size() != size()) |
117 |
|
|
throw new Exception("Size: " + deque.size() + |
118 |
|
|
", expecting " + size()); |
119 |
|
|
if (deque.isEmpty() != (size() == 0)) |
120 |
|
|
throw new Exception( |
121 |
|
|
"IsEmpty " + deque.isEmpty() + ", size " + size()); |
122 |
|
|
// Check head and tail |
123 |
jsr166 |
1.3 |
if (size() == 0) |
124 |
dl |
1.1 |
testEmpty(deque); |
125 |
jsr166 |
1.3 |
else |
126 |
dl |
1.1 |
nonEmptyTest(deque); |
127 |
|
|
|
128 |
|
|
} |
129 |
|
|
|
130 |
jsr166 |
1.3 |
static void nonEmptyTest(Deque<Integer> deque) throws Exception { |
131 |
dl |
1.1 |
if (deque.getFirst() != nextHead + 1) |
132 |
jsr166 |
1.3 |
throw new Exception("getFirst got: " + |
133 |
dl |
1.1 |
deque.getFirst() + " expecting " + (nextHead + 1)); |
134 |
|
|
if (deque.element() != nextHead + 1) |
135 |
|
|
throw new Exception("element got: " + deque.element() + |
136 |
|
|
" expecting " + (nextHead + 1)); |
137 |
|
|
if (deque.peekFirst() != nextHead + 1) |
138 |
|
|
throw new Exception("peekFirst got: "+deque.peekFirst() + |
139 |
|
|
" expecting " + (nextHead + 1)); |
140 |
|
|
if (deque.peek() != nextHead + 1) |
141 |
|
|
throw new Exception("peek got: " + deque.peek() + |
142 |
|
|
" expecting " + (nextHead + 1)); |
143 |
jsr166 |
1.3 |
|
144 |
dl |
1.1 |
if (deque.peekLast() != nextTail - 1) |
145 |
|
|
throw new Exception("peekLast got: " + deque.peekLast() + |
146 |
|
|
" expecting " + (nextTail - 1)); |
147 |
|
|
if (deque.getLast() != nextTail - 1) |
148 |
jsr166 |
1.3 |
throw new Exception("getLast got: " + |
149 |
dl |
1.1 |
deque.getLast() + " expecting " + (nextTail - 1)); |
150 |
jsr166 |
1.3 |
} |
151 |
|
|
|
152 |
dl |
1.1 |
static void randomOp(Deque<Integer> deque) throws Exception { |
153 |
jsr166 |
1.3 |
|
154 |
dl |
1.1 |
// Perform a random operation |
155 |
jsr166 |
1.5 |
switch (random() & 3) { |
156 |
dl |
1.1 |
case 0: |
157 |
jsr166 |
1.5 |
switch (random() & 3) { |
158 |
dl |
1.1 |
case 0: deque.addLast(nextTail++); break; |
159 |
|
|
case 1: deque.offerLast(nextTail++); break; |
160 |
|
|
case 2: deque.offer(nextTail++); break; |
161 |
|
|
case 3: deque.add(nextTail++); break; |
162 |
|
|
default: throw new Exception("How'd we get here"); |
163 |
|
|
} |
164 |
|
|
break; |
165 |
|
|
case 1: |
166 |
|
|
if (size() == 0) { |
167 |
|
|
int result = 666; |
168 |
|
|
boolean threw = false; |
169 |
|
|
try { |
170 |
jsr166 |
1.5 |
switch (random(3)) { |
171 |
dl |
1.1 |
case 0: result = deque.removeFirst(); break; |
172 |
|
|
case 1: result = deque.remove(); break; |
173 |
|
|
case 2: result = deque.pop(); break; |
174 |
|
|
default: throw new Exception("How'd we get here"); |
175 |
|
|
} |
176 |
jsr166 |
1.4 |
} catch (NoSuchElementException e) { |
177 |
dl |
1.1 |
threw = true; |
178 |
|
|
} |
179 |
|
|
if (!threw) |
180 |
|
|
throw new Exception("Remove-no exception: " + result); |
181 |
|
|
} else { // deque nonempty |
182 |
|
|
int result = -1; |
183 |
jsr166 |
1.5 |
switch (random(5)) { |
184 |
dl |
1.1 |
case 0: result = deque.removeFirst(); break; |
185 |
|
|
case 1: result = deque.remove(); break; |
186 |
|
|
case 2: result = deque.pop(); break; |
187 |
|
|
case 3: result = deque.pollFirst(); break; |
188 |
|
|
case 4: result = deque.poll(); break; |
189 |
|
|
default: throw new Exception("How'd we get here"); |
190 |
|
|
} |
191 |
|
|
if (result != ++nextHead) |
192 |
|
|
throw new Exception( |
193 |
|
|
"Removed "+ result + " expecting "+(nextHead - 1)); |
194 |
|
|
} |
195 |
|
|
break; |
196 |
|
|
case 2: |
197 |
jsr166 |
1.5 |
switch (random(3)) { |
198 |
dl |
1.1 |
case 0: deque.addFirst(nextHead--); break; |
199 |
|
|
case 1: deque.offerFirst(nextHead--); break; |
200 |
|
|
case 2: deque.push(nextHead--); break; |
201 |
|
|
default: throw new Exception("How'd we get here"); |
202 |
|
|
} |
203 |
|
|
break; |
204 |
|
|
case 3: |
205 |
|
|
if (size() == 0) { |
206 |
|
|
int result = -1; |
207 |
|
|
boolean threw = false; |
208 |
|
|
try { |
209 |
|
|
result = deque.removeLast(); |
210 |
jsr166 |
1.4 |
} catch (NoSuchElementException e) { |
211 |
dl |
1.1 |
threw = true; |
212 |
|
|
} |
213 |
|
|
if (!threw) |
214 |
|
|
throw new Exception("Remove-no exception: " + result); |
215 |
|
|
} else { // deque nonempty |
216 |
jsr166 |
1.4 |
int result = ((random() & 1) == 0 ? |
217 |
dl |
1.1 |
deque.removeLast() : deque.pollLast()); |
218 |
|
|
if (result != --nextTail) |
219 |
|
|
throw new Exception( |
220 |
jsr166 |
1.4 |
"Removed "+ result + " expecting "+(nextTail + 1)); |
221 |
dl |
1.1 |
} |
222 |
|
|
break; |
223 |
|
|
default: |
224 |
|
|
throw new Exception("How'd we get here"); |
225 |
|
|
} |
226 |
|
|
} |
227 |
|
|
|
228 |
|
|
private static void testEqual(Deque<Integer> d1, Deque<Integer> d2) |
229 |
|
|
throws Exception |
230 |
|
|
{ |
231 |
|
|
if (d1.size() != d2.size()) |
232 |
|
|
throw new Exception("Size " + d1.size() + " != " + d2.size()); |
233 |
|
|
Iterator<Integer> it = d2.iterator(); |
234 |
jsr166 |
1.4 |
for (int i : d1) { |
235 |
dl |
1.1 |
int j = it.next(); |
236 |
|
|
if (j != i) |
237 |
|
|
throw new Exception("Element " + j + " != " + i); |
238 |
|
|
} |
239 |
|
|
|
240 |
jsr166 |
1.4 |
for (int i : d1) |
241 |
dl |
1.1 |
if (!d2.contains(i)) |
242 |
|
|
throw new Exception("d2 doesn't contain " + i); |
243 |
jsr166 |
1.4 |
for (int i : d2) |
244 |
dl |
1.1 |
if (!d1.contains(i)) |
245 |
|
|
throw new Exception("d2 doesn't contain " + i); |
246 |
|
|
|
247 |
|
|
if (d1.contains(Integer.MIN_VALUE)) |
248 |
|
|
throw new Exception("d2 contains Integer.MIN_VALUE"); |
249 |
|
|
if (d2.contains(Integer.MIN_VALUE)) |
250 |
|
|
throw new Exception("d2 contains Integer.MIN_VALUE"); |
251 |
|
|
if (d1.contains(null)) |
252 |
|
|
throw new Exception("d1 contains null"); |
253 |
|
|
if (d2.contains(null)) |
254 |
|
|
throw new Exception("d2 contains null"); |
255 |
|
|
|
256 |
|
|
if (!d1.containsAll(d2)) |
257 |
|
|
throw new Exception("d1 doesn't contain all of d2"); |
258 |
|
|
if (!d2.containsAll(d1)) |
259 |
|
|
throw new Exception("d2 doesn't contain all of d1"); |
260 |
|
|
Collection<Integer> c = Collections.singleton(Integer.MIN_VALUE); |
261 |
|
|
if (d1.containsAll(c)) |
262 |
|
|
throw new Exception("d1 contains all of {Integer.MIN_VALUE }"); |
263 |
|
|
if (d2.containsAll(c)) |
264 |
|
|
throw new Exception("d2 contains all of {Integer.MIN_VALUE }"); |
265 |
|
|
} |
266 |
|
|
|
267 |
jsr166 |
1.6 |
@SuppressWarnings("unchecked") |
268 |
|
|
private static <T> T copyConstructorClone(T o) throws Exception { |
269 |
|
|
return (T) o.getClass().getConstructor(Collection.class).newInstance(o); |
270 |
|
|
} |
271 |
|
|
|
272 |
|
|
@SuppressWarnings("unchecked") |
273 |
|
|
private static <T> T serialClone(T o) throws Exception { |
274 |
|
|
ByteArrayOutputStream bos = new ByteArrayOutputStream(); |
275 |
|
|
ObjectOutputStream oos = new ObjectOutputStream(bos); |
276 |
|
|
oos.writeObject(o); |
277 |
|
|
oos.flush(); |
278 |
|
|
oos.close(); |
279 |
|
|
ByteArrayInputStream bin = |
280 |
|
|
new ByteArrayInputStream(bos.toByteArray()); |
281 |
|
|
ObjectInputStream ois = new ObjectInputStream(bin); |
282 |
dl |
1.1 |
return (T) ois.readObject(); |
283 |
|
|
} |
284 |
|
|
|
285 |
|
|
private static void testRemove(Deque<Integer> deque) throws Exception { |
286 |
jsr166 |
1.6 |
Deque<Integer> copy = ((random() & 1) == 0) ? |
287 |
|
|
copyConstructorClone(deque) : |
288 |
|
|
serialClone(deque); |
289 |
dl |
1.1 |
|
290 |
|
|
int numRemoved = 0; |
291 |
|
|
for (Iterator<Integer> it = copy.iterator(); it.hasNext(); ) { |
292 |
|
|
if ((it.next() & 1) == 0) { |
293 |
|
|
it.remove(); |
294 |
|
|
numRemoved++; |
295 |
|
|
} |
296 |
|
|
} |
297 |
|
|
|
298 |
|
|
if (copy.size() + numRemoved != size()) |
299 |
|
|
throw new Exception((copy.size() + numRemoved) + " != " + size()); |
300 |
|
|
for (int i : copy) |
301 |
|
|
if ((i & 1) == 0) |
302 |
|
|
throw new Exception("Even number still present: " + i); |
303 |
|
|
|
304 |
|
|
List<Integer> elements = Arrays.asList(copy.toArray(new Integer[0])); |
305 |
|
|
Collections.shuffle(elements); |
306 |
|
|
for (int e : elements) { |
307 |
|
|
if (!copy.contains(e)) |
308 |
|
|
throw new Exception(e + " missing."); |
309 |
|
|
|
310 |
|
|
boolean removed = false; |
311 |
jsr166 |
1.5 |
switch (random(3)) { |
312 |
dl |
1.1 |
case 0: removed = copy.remove(e); break; |
313 |
|
|
case 1: removed = copy.removeFirstOccurrence(e); break; |
314 |
|
|
case 2: removed = copy.removeLastOccurrence(e); break; |
315 |
jsr166 |
1.3 |
default: throw new Exception("How'd we get here"); |
316 |
dl |
1.1 |
} |
317 |
|
|
if (!removed) |
318 |
|
|
throw new Exception(e + " not removed."); |
319 |
|
|
|
320 |
|
|
if (copy.contains(e)) |
321 |
|
|
throw new Exception(e + " present after removal."); |
322 |
|
|
} |
323 |
|
|
|
324 |
|
|
testEmpty(copy); |
325 |
|
|
|
326 |
jsr166 |
1.6 |
copy = copyConstructorClone(deque); |
327 |
dl |
1.1 |
copy.retainAll(deque); |
328 |
|
|
testEqual(deque, copy); |
329 |
|
|
copy.removeAll(deque); |
330 |
|
|
testEmpty(copy); |
331 |
|
|
} |
332 |
|
|
|
333 |
|
|
static boolean checkedThrows; |
334 |
|
|
|
335 |
|
|
private static void testEmpty(Deque<Integer> deque) throws Exception { |
336 |
|
|
if (!deque.isEmpty()) |
337 |
|
|
throw new Exception("Deque isn't empty"); |
338 |
|
|
if (deque.size() != 0) |
339 |
|
|
throw new Exception("Deque size isn't zero"); |
340 |
|
|
if (!(deque.pollFirst() == null)) |
341 |
|
|
throw new Exception("pollFirst lies"); |
342 |
|
|
if (!(deque.poll() == null)) |
343 |
|
|
throw new Exception("poll lies"); |
344 |
|
|
if (!(deque.peekFirst() == null)) |
345 |
|
|
throw new Exception("peekFirst lies"); |
346 |
|
|
if (!(deque.peek() == null)) |
347 |
|
|
throw new Exception("peek lies"); |
348 |
|
|
if (!(deque.pollLast() == null)) |
349 |
|
|
throw new Exception("pollLast lies"); |
350 |
|
|
if (!(deque.peekLast() == null)) |
351 |
|
|
throw new Exception("peekLast lies"); |
352 |
|
|
|
353 |
|
|
if (!checkedThrows) { |
354 |
|
|
checkedThrows = true; |
355 |
|
|
boolean threw = false; |
356 |
|
|
int result = 666; |
357 |
|
|
try { |
358 |
jsr166 |
1.4 |
result = ((random() & 1) == 0 ? |
359 |
dl |
1.1 |
deque.getFirst() : deque.element()); |
360 |
jsr166 |
1.4 |
} catch (NoSuchElementException e) { |
361 |
dl |
1.1 |
threw = true; |
362 |
|
|
} |
363 |
|
|
if (!threw) |
364 |
|
|
throw new Exception("getFirst-no exception: "+result); |
365 |
|
|
threw = false; |
366 |
|
|
try { |
367 |
|
|
result = deque.getLast(); |
368 |
jsr166 |
1.4 |
} catch (NoSuchElementException e) { |
369 |
dl |
1.1 |
threw = true; |
370 |
|
|
} |
371 |
|
|
if (!threw) |
372 |
|
|
throw new Exception("getLast-no exception: "+result); |
373 |
|
|
} |
374 |
|
|
|
375 |
|
|
} |
376 |
|
|
} |