1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/emul/compact/src/main/java/java/lang/ref/WeakReference.java Tue Feb 26 14:55:55 2013 +0100
1.3 @@ -0,0 +1,72 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2003, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package java.lang.ref;
1.30 +
1.31 +
1.32 +/**
1.33 + * Weak reference objects, which do not prevent their referents from being
1.34 + * made finalizable, finalized, and then reclaimed. Weak references are most
1.35 + * often used to implement canonicalizing mappings.
1.36 + *
1.37 + * <p> Suppose that the garbage collector determines at a certain point in time
1.38 + * that an object is <a href="package-summary.html#reachability">weakly
1.39 + * reachable</a>. At that time it will atomically clear all weak references to
1.40 + * that object and all weak references to any other weakly-reachable objects
1.41 + * from which that object is reachable through a chain of strong and soft
1.42 + * references. At the same time it will declare all of the formerly
1.43 + * weakly-reachable objects to be finalizable. At the same time or at some
1.44 + * later time it will enqueue those newly-cleared weak references that are
1.45 + * registered with reference queues.
1.46 + *
1.47 + * @author Mark Reinhold
1.48 + * @since 1.2
1.49 + */
1.50 +
1.51 +public class WeakReference<T> extends Reference<T> {
1.52 +
1.53 + /**
1.54 + * Creates a new weak reference that refers to the given object. The new
1.55 + * reference is not registered with any queue.
1.56 + *
1.57 + * @param referent object the new weak reference will refer to
1.58 + */
1.59 + public WeakReference(T referent) {
1.60 + super(referent);
1.61 + }
1.62 +
1.63 + /**
1.64 + * Creates a new weak reference that refers to the given object and is
1.65 + * registered with the given queue.
1.66 + *
1.67 + * @param referent object the new weak reference will refer to
1.68 + * @param q the queue with which the reference is to be registered,
1.69 + * or <tt>null</tt> if registration is not required
1.70 + */
1.71 + public WeakReference(T referent, ReferenceQueue<? super T> q) {
1.72 + super(referent, q);
1.73 + }
1.74 +
1.75 +}