214 lines
7.4 KiB
Java
214 lines
7.4 KiB
Java
/*
|
|
* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* This code is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 only, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* version 2 for more details (a copy is included in the LICENSE file that
|
|
* accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU General Public License version
|
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*/
|
|
|
|
/*
|
|
* @test
|
|
* @bug 7121314
|
|
* @summary AbstractCollection.toArray(T[]) doesn't return the given array
|
|
* in concurrent modification.
|
|
* @author Ulf Zibis, David Holmes
|
|
*/
|
|
|
|
import java.util.AbstractCollection;
|
|
import java.util.Arrays;
|
|
import java.util.Iterator;
|
|
|
|
public class ToArrayTest {
|
|
|
|
static class TestCollection<E> extends AbstractCollection<E> {
|
|
private final E[] elements;
|
|
private int[] sizes;
|
|
private int nextSize;
|
|
|
|
public TestCollection(E[] elements) {
|
|
this.elements = elements;
|
|
setSizeSequence(new int[] { elements.length });
|
|
}
|
|
|
|
/*
|
|
* Sets the values that size() will return on each use. The next
|
|
* call to size will return sizes[0], then sizes[1] etc. This allows us
|
|
* to emulate a concurrent change to the contents of the collection
|
|
* without having to perform concurrent changes. If sizes[n+1] contains
|
|
* a larger value, the collection will appear to have shrunk when
|
|
* iterated; if a smaller value then the collection will appear to have
|
|
* grown when iterated.
|
|
*/
|
|
void setSizeSequence(int... sizes) {
|
|
this.sizes = sizes;
|
|
nextSize = 0;
|
|
}
|
|
|
|
/* can change collection's size after each invocation */
|
|
@Override
|
|
public int size() {
|
|
return sizes[nextSize == sizes.length - 1 ? nextSize : nextSize++];
|
|
}
|
|
|
|
@Override
|
|
public Iterator<E> iterator() {
|
|
return new Iterator<E>() {
|
|
int pos = 0;
|
|
|
|
public boolean hasNext() {
|
|
return pos < sizes[nextSize];
|
|
}
|
|
public E next() {
|
|
return elements[pos++];
|
|
}
|
|
public void remove() {
|
|
throw new UnsupportedOperationException(
|
|
"Not supported yet.");
|
|
}
|
|
};
|
|
}
|
|
}
|
|
|
|
static final Object[] OBJECTS = { new Object(), new Object(), new Object() };
|
|
static final TestCollection<?> CANDIDATE = new TestCollection<Object>(OBJECTS);
|
|
static final int CAP = OBJECTS.length; // capacity of the CANDIDATE
|
|
static final int LAST = CAP - 1; // last possible array index
|
|
Object[] a;
|
|
Object[] res;
|
|
|
|
int last() {
|
|
return a.length - 1;
|
|
}
|
|
|
|
protected void test() throws Throwable {
|
|
// Check array type conversion
|
|
res = new TestCollection<>(new Object[] { "1", "2" }).toArray(new String[0]);
|
|
check(res instanceof String[]);
|
|
check(res.length == 2);
|
|
check(res[1] == "2");
|
|
|
|
// Check incompatible type of target array
|
|
try {
|
|
res = CANDIDATE.toArray(new String[CAP]);
|
|
check(false);
|
|
} catch (Throwable t) {
|
|
check(t instanceof ArrayStoreException);
|
|
}
|
|
|
|
// Check more elements than a.length
|
|
a = new Object[CAP - 1]; // appears too small
|
|
res = CANDIDATE.toArray(a);
|
|
check(res != a);
|
|
check(res[LAST] != null);
|
|
|
|
// Check equal elements as a.length
|
|
a = new Object[CAP]; // appears to match
|
|
res = CANDIDATE.toArray(a);
|
|
check(res == a);
|
|
check(res[last()] != null);
|
|
|
|
// Check equal elements as a.length
|
|
a = new Object[CAP + 1]; // appears too big
|
|
res = CANDIDATE.toArray(a);
|
|
check(res == a);
|
|
check(res[last()] == null);
|
|
|
|
// Check less elements than expected, but more than a.length
|
|
a = new Object[CAP - 2]; // appears too small
|
|
CANDIDATE.setSizeSequence(CAP, CAP - 1);
|
|
res = CANDIDATE.toArray(a);
|
|
check(res != a);
|
|
check(res.length == CAP - 1);
|
|
check(res[LAST - 1] != null);
|
|
|
|
// Check less elements than expected, but equal as a.length
|
|
a = Arrays.copyOf(OBJECTS, CAP); // appears to match
|
|
CANDIDATE.setSizeSequence(CAP, CAP - 1);
|
|
res = CANDIDATE.toArray(a);
|
|
check(res == a);
|
|
check(res[last()] == null);
|
|
|
|
// Check more elements than expected and more than a.length
|
|
a = new Object[CAP - 1]; // appears to match
|
|
CANDIDATE.setSizeSequence(CAP - 1, CAP);
|
|
res = CANDIDATE.toArray(a);
|
|
check(res != a);
|
|
check(res[LAST] != null);
|
|
|
|
// Check more elements than expected, but equal as a.length
|
|
a = new Object[CAP - 1]; // appears to match
|
|
CANDIDATE.setSizeSequence(CAP - 2, CAP - 1);
|
|
res = CANDIDATE.toArray(a);
|
|
check(res == a);
|
|
check(res[last()] != null);
|
|
|
|
// Check more elements than expected, but less than a.length
|
|
a = Arrays.copyOf(OBJECTS, CAP); // appears to match
|
|
CANDIDATE.setSizeSequence(CAP - 2, CAP - 1);
|
|
res = CANDIDATE.toArray(a);
|
|
check(res == a);
|
|
check(res[last()] == null);
|
|
|
|
test_7121314();
|
|
}
|
|
|
|
/*
|
|
* Major target of this testcase, bug 7121314.
|
|
*/
|
|
protected void test_7121314() throws Throwable {
|
|
// Check equal elements as a.length, but less than expected
|
|
a = new Object[CAP - 1]; // appears too small
|
|
CANDIDATE.setSizeSequence(CAP, CAP - 1);
|
|
res = CANDIDATE.toArray(a);
|
|
check(res == a);
|
|
check(res[last()] != null);
|
|
|
|
// Check less elements than a.length and less than expected
|
|
a = Arrays.copyOf(OBJECTS, CAP - 1); // appears too small
|
|
CANDIDATE.setSizeSequence(CAP, CAP - 2);
|
|
res = CANDIDATE.toArray(a);
|
|
check(res == a);
|
|
check(res[last()] == null);
|
|
|
|
}
|
|
|
|
public static void main(String[] args) throws Throwable {
|
|
ToArrayTest testcase = new ToArrayTest();
|
|
try {
|
|
testcase.test();
|
|
} catch (Throwable t) {
|
|
unexpected(t);
|
|
}
|
|
|
|
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
|
|
if (failed > 0) throw new Exception("Some tests failed");
|
|
}
|
|
|
|
//--------------------- Infrastructure ---------------------------
|
|
static volatile int passed = 0, failed = 0;
|
|
static void pass() { passed++; }
|
|
static void fail() { failed++; Thread.dumpStack(); }
|
|
static void fail(String msg) { System.out.println(msg); fail(); }
|
|
static void unexpected(Throwable t) { failed++; t.printStackTrace(); }
|
|
static void check(boolean cond) { if (cond) pass(); else fail(); }
|
|
static void equal(Object x, Object y) {
|
|
if (x == null ? y == null : x.equals(y)) pass();
|
|
else {System.out.println(x + " not equal to " + y); fail(); }
|
|
}
|
|
}
|