| 1 |
/* |
| 2 |
* Copyright (c) 2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 |
* CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 |
* have any questions. |
| 22 |
*/ |
| 23 |
|
| 24 |
/* |
| 25 |
* @test |
| 26 |
* @bug 5017904 6356890 |
| 27 |
* @summary Test empty iterators, enumerations, and collections |
| 28 |
*/ |
| 29 |
|
| 30 |
import java.util.*; |
| 31 |
import static java.util.Collections.*; |
| 32 |
|
| 33 |
public class EmptyIterator { |
| 34 |
|
| 35 |
void test(String[] args) throws Throwable { |
| 36 |
testEmptyCollection(Collections.<Object>emptyList()); |
| 37 |
testEmptyCollection(Collections.<Object>emptySet()); |
| 38 |
testEmptyCollection(new java.util.concurrent. |
| 39 |
SynchronousQueue<Object>()); |
| 40 |
|
| 41 |
testEmptyMap(Collections.<Object, Object>emptyMap()); |
| 42 |
|
| 43 |
Hashtable<Object, Object> emptyTable = new Hashtable<Object, Object>(); |
| 44 |
testEmptyEnumeration(emptyTable.keys()); |
| 45 |
testEmptyEnumeration(emptyTable.elements()); |
| 46 |
testEmptyIterator(emptyTable.keySet().iterator()); |
| 47 |
testEmptyIterator(emptyTable.values().iterator()); |
| 48 |
testEmptyIterator(emptyTable.entrySet().iterator()); |
| 49 |
|
| 50 |
testEmptyEnumeration(javax.swing.tree.DefaultMutableTreeNode |
| 51 |
.EMPTY_ENUMERATION); |
| 52 |
testEmptyEnumeration(javax.swing.text.SimpleAttributeSet |
| 53 |
.EMPTY.getAttributeNames()); |
| 54 |
|
| 55 |
@SuppressWarnings("unchecked") Iterator<?> x = |
| 56 |
new sun.tools.java.MethodSet() |
| 57 |
.lookupName(sun.tools.java.Identifier.lookup("")); |
| 58 |
testEmptyIterator(x); |
| 59 |
} |
| 60 |
|
| 61 |
<T> void testEmptyEnumeration(final Enumeration<T> e) { |
| 62 |
check(e == emptyEnumeration()); |
| 63 |
check(! e.hasMoreElements()); |
| 64 |
THROWS(NoSuchElementException.class, |
| 65 |
new F(){void f(){ e.nextElement(); }}); |
| 66 |
} |
| 67 |
|
| 68 |
<T> void testEmptyIterator(final Iterator<T> it) { |
| 69 |
check(it == emptyIterator()); |
| 70 |
check(! it.hasNext()); |
| 71 |
THROWS(NoSuchElementException.class, |
| 72 |
new F(){void f(){ it.next(); }}); |
| 73 |
THROWS(IllegalStateException.class, |
| 74 |
new F(){void f(){ it.remove(); }}); |
| 75 |
} |
| 76 |
|
| 77 |
void testEmptyMap(Map<Object, Object> m) { |
| 78 |
check(m == emptyMap()); |
| 79 |
check(m.entrySet().iterator() == |
| 80 |
Collections.<Map.Entry<Object,Object>>emptyIterator()); |
| 81 |
check(m.values().iterator() == emptyIterator()); |
| 82 |
check(m.keySet().iterator() == emptyIterator()); |
| 83 |
equal(m, unmodifiableMap(m)); |
| 84 |
|
| 85 |
testEmptyCollection(m.keySet()); |
| 86 |
testEmptyCollection(m.entrySet()); |
| 87 |
testEmptyCollection(m.values()); |
| 88 |
} |
| 89 |
|
| 90 |
<E> void testToArray(final Collection<E> c) { |
| 91 |
Object[] a = c.toArray(); |
| 92 |
equal(a.length, 0); |
| 93 |
equal(a.getClass().getComponentType(), Object.class); |
| 94 |
THROWS(NullPointerException.class, |
| 95 |
new F(){void f(){ c.toArray((Object[])null); }}); |
| 96 |
|
| 97 |
{ |
| 98 |
String[] t = new String[0]; |
| 99 |
check(c.toArray(t) == t); |
| 100 |
} |
| 101 |
|
| 102 |
{ |
| 103 |
String[] t = nCopies(10, "").toArray(new String[0]); |
| 104 |
check(c.toArray(t) == t); |
| 105 |
check(t[0] == null); |
| 106 |
for (int i=1; i<t.length; i++) |
| 107 |
check(t[i] == ""); |
| 108 |
} |
| 109 |
} |
| 110 |
|
| 111 |
<E> void testEmptyCollection(final Collection<E> c) { |
| 112 |
testEmptyIterator(c.iterator()); |
| 113 |
|
| 114 |
check(c.iterator() == emptyIterator()); |
| 115 |
if (c instanceof List) |
| 116 |
check(((List<?>)c).listIterator() == emptyListIterator()); |
| 117 |
|
| 118 |
testToArray(c); |
| 119 |
} |
| 120 |
|
| 121 |
//--------------------- Infrastructure --------------------------- |
| 122 |
volatile int passed = 0, failed = 0; |
| 123 |
void pass() {passed++;} |
| 124 |
void fail() {failed++; Thread.dumpStack();} |
| 125 |
void fail(String msg) {System.err.println(msg); fail();} |
| 126 |
void unexpected(Throwable t) {failed++; t.printStackTrace();} |
| 127 |
void check(boolean cond) {if (cond) pass(); else fail();} |
| 128 |
void equal(Object x, Object y) { |
| 129 |
if (x == null ? y == null : x.equals(y)) pass(); |
| 130 |
else fail(x + " not equal to " + y);} |
| 131 |
public static void main(String[] args) throws Throwable { |
| 132 |
new EmptyIterator().instanceMain(args);} |
| 133 |
void instanceMain(String[] args) throws Throwable { |
| 134 |
try {test(args);} catch (Throwable t) {unexpected(t);} |
| 135 |
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); |
| 136 |
if (failed > 0) throw new AssertionError("Some tests failed");} |
| 137 |
abstract class F {abstract void f() throws Throwable;} |
| 138 |
void THROWS(Class<? extends Throwable> k, F... fs) { |
| 139 |
for (F f : fs) |
| 140 |
try {f.f(); fail("Expected " + k.getName() + " not thrown");} |
| 141 |
catch (Throwable t) { |
| 142 |
if (k.isAssignableFrom(t.getClass())) pass(); |
| 143 |
else unexpected(t);}} |
| 144 |
} |
