200 lines
6.8 KiB
Java
200 lines
6.8 KiB
Java
/*
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* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 6409434
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* @summary Test behavior of nulls in checked collections
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*/
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import java.util.AbstractMap;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.TreeSet;
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import static java.util.Collections.singleton;
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import static java.util.Collections.singletonMap;
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@SuppressWarnings({"unchecked","serial"})
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public class CheckedNull {
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void test(String[] args) throws Throwable {
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testCollection(Collections.checkedCollection(
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new ArrayList<String>(), String.class));
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testCollection(Collections.checkedList(
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new ArrayList<String>(), String.class));
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testCollection(Collections.checkedSet(
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new HashSet<String>(), String.class));
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final Comparator nullLow = new Comparator() {
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public int compare(Object x, Object y) {
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return x == y ? 0 :
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x == null ? -1 :
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y == null ? 1 :
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((Comparable)x).compareTo(y); }};
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testCollection(Collections.checkedSortedSet(
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new TreeSet<String>(nullLow), String.class));
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testMap(Collections.checkedMap(
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new HashMap<String, String>(),
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String.class, String.class));
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}
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ClassCastException cce(F f) {
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try { f.f(); fail(); return null; }
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catch (ClassCastException cce) { pass(); return cce; }
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catch (Throwable t) { unexpected(t); return null; }
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}
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void equalCCE(F ... fs) {
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String detailMessage = null;
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for (F f : fs)
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if (detailMessage == null)
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detailMessage = cce(f).getMessage();
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else
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equal(detailMessage, cce(f).getMessage());
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}
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void add(Collection c, Object o) {
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int s = c.size();
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check(! c.contains(o));
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check(c.add(o));
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check(c.contains(o));
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equal(c.size(), s+1);
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check(c.remove(o));
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check(! c.contains(o));
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check(c.addAll(singleton(o)));
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check(c.contains(o));
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equal(c.size(), s+1);
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check(c.remove(o));
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equal(c.size(), s);
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}
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void testCollection(final Collection c) {
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try {
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check(c.isEmpty());
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add(c, null);
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add(c, "foo");
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check(c.add("bar"));
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add(c, null);
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add(c, "foo");
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equalCCE(
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new F(){void f(){ c.add(1); }},
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new F(){void f(){ c.addAll(singleton(1)); }});
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} catch (Throwable t) { unexpected(t); }
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}
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void put(Map m, Object k, Object v) {
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int s = m.size();
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check(! m.containsKey(k));
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check(! m.containsValue(v));
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equal(null, m.put(k, v));
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check(m.containsKey(k));
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check(m.containsValue(v));
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equal(m.size(), s+1);
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equal(v, m.remove(k));
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check(! m.containsKey(k));
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check(! m.containsValue(v));
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m.putAll(singletonMap(k,v));
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check(m.containsKey(k));
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check(m.containsValue(v));
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equal(m.size(), s+1);
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equal(v,m.remove(k));
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equal(m.size(), s);
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}
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void testMap(final Map m) {
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try {
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check(m.isEmpty());
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put(m, "foo", null);
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put(m, null, "foo");
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put(m, null, null);
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put(m, "foo", "bar");
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m.put("a", "b");
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put(m, "foo", null);
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put(m, null, "foo");
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put(m, null, null);
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put(m, "foo", "bar");
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equalCCE(
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new F(){void f(){ m.put(1, "foo"); }},
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new F(){void f(){ m.putAll(singletonMap(1, "foo")); }});
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final Collection cheater = new ArrayList() {
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public boolean contains(Object o) {
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if (o instanceof Map.Entry)
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((Map.Entry)o).setValue(1);
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return false; }};
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equalCCE(
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new F(){void f(){ m.put("foo", 1); }},
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new F(){void f(){ m.putAll(singletonMap("foo", 1)); }},
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new F(){void f(){
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((Map.Entry)m.entrySet().iterator().next()).setValue(1); }},
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new F(){void f(){
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m.entrySet().removeAll(cheater);}},
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new F(){void f(){
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m.entrySet().retainAll(cheater);}});
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equalCCE(
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new F(){void f(){ m.put(3, 1); }},
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new F(){void f(){ m.putAll(singletonMap(3, 1)); }});
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equal(m.size(), 1);
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equal(m.keySet(), singleton("a"));
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equal(m.entrySet(),
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singleton(new AbstractMap.SimpleImmutableEntry("a","b")));
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} catch (Throwable t) { unexpected(t); }
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}
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//--------------------- Infrastructure ---------------------------
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volatile int passed = 0, failed = 0;
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void pass() {passed++;}
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void fail() {failed++; Thread.dumpStack();}
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void fail(String msg) {System.err.println(msg); fail();}
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void unexpected(Throwable t) {failed++; t.printStackTrace();}
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void check(boolean cond) {if (cond) pass(); else fail();}
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void equal(Object x, Object y) {
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if (x == null ? y == null : x.equals(y)) pass();
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else fail(x + " not equal to " + y);}
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public static void main(String[] args) throws Throwable {
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new CheckedNull().instanceMain(args);}
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void instanceMain(String[] args) throws Throwable {
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try {test(args);} catch (Throwable t) {unexpected(t);}
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System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
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if (failed > 0) throw new AssertionError("Some tests failed");}
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abstract class F {abstract void f() throws Throwable;}
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}
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