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/*
* Copyright (c) 2007, 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 6409434
* @summary Test behavior of nulls in checked collections
*/
import java.util.AbstractMap;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.TreeSet;
import static java.util.Collections.singleton;
import static java.util.Collections.singletonMap;
@SuppressWarnings({"unchecked","serial"})
public class CheckedNull {
void test(String[] args) throws Throwable {
testCollection(Collections.checkedCollection(
new ArrayList<String>(), String.class));
testCollection(Collections.checkedList(
new ArrayList<String>(), String.class));
testCollection(Collections.checkedSet(
new HashSet<String>(), String.class));
final Comparator nullLow = new Comparator() {
public int compare(Object x, Object y) {
return x == y ? 0 :
x == null ? -1 :
y == null ? 1 :
((Comparable)x).compareTo(y); }};
testCollection(Collections.checkedSortedSet(
new TreeSet<String>(nullLow), String.class));
testMap(Collections.checkedMap(
new HashMap<String, String>(),
String.class, String.class));
}
ClassCastException cce(F f) {
try { f.f(); fail(); return null; }
catch (ClassCastException cce) { pass(); return cce; }
catch (Throwable t) { unexpected(t); return null; }
}
void equalCCE(F ... fs) {
String detailMessage = null;
for (F f : fs)
if (detailMessage == null)
detailMessage = cce(f).getMessage();
else
equal(detailMessage, cce(f).getMessage());
}
void add(Collection c, Object o) {
int s = c.size();
check(! c.contains(o));
check(c.add(o));
check(c.contains(o));
equal(c.size(), s+1);
check(c.remove(o));
check(! c.contains(o));
check(c.addAll(singleton(o)));
check(c.contains(o));
equal(c.size(), s+1);
check(c.remove(o));
equal(c.size(), s);
}
void testCollection(final Collection c) {
try {
check(c.isEmpty());
add(c, null);
add(c, "foo");
check(c.add("bar"));
add(c, null);
add(c, "foo");
equalCCE(
new F(){void f(){ c.add(1); }},
new F(){void f(){ c.addAll(singleton(1)); }});
} catch (Throwable t) { unexpected(t); }
}
void put(Map m, Object k, Object v) {
int s = m.size();
check(! m.containsKey(k));
check(! m.containsValue(v));
equal(null, m.put(k, v));
check(m.containsKey(k));
check(m.containsValue(v));
equal(m.size(), s+1);
equal(v, m.remove(k));
check(! m.containsKey(k));
check(! m.containsValue(v));
m.putAll(singletonMap(k,v));
check(m.containsKey(k));
check(m.containsValue(v));
equal(m.size(), s+1);
equal(v,m.remove(k));
equal(m.size(), s);
}
void testMap(final Map m) {
try {
check(m.isEmpty());
put(m, "foo", null);
put(m, null, "foo");
put(m, null, null);
put(m, "foo", "bar");
m.put("a", "b");
put(m, "foo", null);
put(m, null, "foo");
put(m, null, null);
put(m, "foo", "bar");
equalCCE(
new F(){void f(){ m.put(1, "foo"); }},
new F(){void f(){ m.putAll(singletonMap(1, "foo")); }});
final Collection cheater = new ArrayList() {
public boolean contains(Object o) {
if (o instanceof Map.Entry)
((Map.Entry)o).setValue(1);
return false; }};
equalCCE(
new F(){void f(){ m.put("foo", 1); }},
new F(){void f(){ m.putAll(singletonMap("foo", 1)); }},
new F(){void f(){
((Map.Entry)m.entrySet().iterator().next()).setValue(1); }},
new F(){void f(){
m.entrySet().removeAll(cheater);}},
new F(){void f(){
m.entrySet().retainAll(cheater);}});
equalCCE(
new F(){void f(){ m.put(3, 1); }},
new F(){void f(){ m.putAll(singletonMap(3, 1)); }});
equal(m.size(), 1);
equal(m.keySet(), singleton("a"));
equal(m.entrySet(),
singleton(new AbstractMap.SimpleImmutableEntry("a","b")));
} catch (Throwable t) { unexpected(t); }
}
//--------------------- Infrastructure ---------------------------
volatile int passed = 0, failed = 0;
void pass() {passed++;}
void fail() {failed++; Thread.dumpStack();}
void fail(String msg) {System.err.println(msg); fail();}
void unexpected(Throwable t) {failed++; t.printStackTrace();}
void check(boolean cond) {if (cond) pass(); else fail();}
void equal(Object x, Object y) {
if (x == null ? y == null : x.equals(y)) pass();
else fail(x + " not equal to " + y);}
public static void main(String[] args) throws Throwable {
new CheckedNull().instanceMain(args);}
void instanceMain(String[] args) throws Throwable {
try {test(args);} catch (Throwable t) {unexpected(t);}
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
if (failed > 0) throw new AssertionError("Some tests failed");}
abstract class F {abstract void f() throws Throwable;}
}
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