diff -r 3392f250c784 -r ecbd252fd3a7 emul/compact/src/main/java/java/lang/ref/PhantomReference.java --- a/emul/compact/src/main/java/java/lang/ref/PhantomReference.java Fri Mar 22 16:59:47 2013 +0100 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,83 +0,0 @@ -/* - * Copyright (c) 1997, 2003, 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. Oracle designates this - * particular file as subject to the "Classpath" exception as provided - * by Oracle in the LICENSE file that accompanied this code. - * - * 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. - */ - -package java.lang.ref; - - -/** - * Phantom reference objects, which are enqueued after the collector - * determines that their referents may otherwise be reclaimed. Phantom - * references are most often used for scheduling pre-mortem cleanup actions in - * a more flexible way than is possible with the Java finalization mechanism. - * - *
If the garbage collector determines at a certain point in time that the - * referent of a phantom reference is phantom reachable, then at that - * time or at some later time it will enqueue the reference. - * - *
In order to ensure that a reclaimable object remains so, the referent of
- * a phantom reference may not be retrieved: The get
method of a
- * phantom reference always returns null
.
- *
- *
Unlike soft and weak references, phantom references are not
- * automatically cleared by the garbage collector as they are enqueued. An
- * object that is reachable via phantom references will remain so until all
- * such references are cleared or themselves become unreachable.
- *
- * @author Mark Reinhold
- * @since 1.2
- */
-
-public class PhantomReference It is possible to create a phantom reference with a null
- * queue, but such a reference is completely useless: Its get
- * method will always return null and, since it does not have a queue, it
- * will never be enqueued.
- *
- * @param referent the object the new phantom reference will refer to
- * @param q the queue with which the reference is to be registered,
- * or null if registration is not required
- */
- public PhantomReference(T referent, ReferenceQueue super T> q) {
- super(referent, q);
- }
-
-}
null
.
- *
- * @return null
- */
- public T get() {
- return null;
- }
-
- /**
- * Creates a new phantom reference that refers to the given object and
- * is registered with the given queue.
- *
- *