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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/lang/ref/WeakReference.java | |
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Diffstat (limited to 'libjava/classpath/java/lang/ref/WeakReference.java')
-rw-r--r-- | libjava/classpath/java/lang/ref/WeakReference.java | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/libjava/classpath/java/lang/ref/WeakReference.java b/libjava/classpath/java/lang/ref/WeakReference.java new file mode 100644 index 000000000..973564336 --- /dev/null +++ b/libjava/classpath/java/lang/ref/WeakReference.java @@ -0,0 +1,79 @@ +/* java.lang.ref.WeakReference + Copyright (C) 1999, 2004 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.ref; + +/** + * A weak reference will be cleared, if the object is only weakly + * reachable. It is useful for lookup tables, where you aren't + * interested in an entry, if the key isn't reachable anymore. + * <code>WeakHashtable</code> is a complete implementation of such a + * table. <br> + * + * It is also useful to make objects unique: You create a set of weak + * references to those objects, and when you create a new object you + * look in this set, if the object already exists and return it. If + * an object is not referenced anymore, the reference will + * automatically cleared, and you may remove it from the set. <br> + * + * @author Jochen Hoenicke + * @see java.util.WeakHashMap + */ +public class WeakReference<T> + extends Reference<T> +{ + /** + * Create a new weak reference, that is not registered to any queue. + * @param referent the object we refer to. + */ + public WeakReference(T referent) + { + super(referent); + } + + /** + * Create a new weak reference. + * @param referent the object we refer to. + * @param q the reference queue to register on. + * @exception NullPointerException if q is null. + */ + public WeakReference(T referent, ReferenceQueue<? super T> q) + { + super(referent, q); + } +} |