diff options
Diffstat (limited to 'libjava/classpath/java/lang/ref/SoftReference.java')
-rw-r--r-- | libjava/classpath/java/lang/ref/SoftReference.java | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/libjava/classpath/java/lang/ref/SoftReference.java b/libjava/classpath/java/lang/ref/SoftReference.java new file mode 100644 index 0000000..97395ea --- /dev/null +++ b/libjava/classpath/java/lang/ref/SoftReference.java @@ -0,0 +1,84 @@ +/* java.lang.ref.SoftReference + Copyright (C) 1999 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 soft reference will be cleared, if the object is only softly + * reachable and the garbage collection needs more memory. The garbage + * collection will use an intelligent strategy to determine which soft + * references it should clear. This makes a soft reference ideal for + * caches.<br> + * + * @author Jochen Hoenicke + */ +public class SoftReference + extends Reference +{ + /** + * Create a new soft reference, that is not registered to any queue. + * @param referent the object we refer to. + */ + public SoftReference(Object referent) + { + super(referent); + } + + /** + * Create a new soft reference. + * @param referent the object we refer to. + * @param q the reference queue to register on. + * @exception NullPointerException if q is null. + */ + public SoftReference(Object referent, ReferenceQueue q) + { + super(referent, q); + } + + /** + * Returns the object, this reference refers to. + * @return the object, this reference refers to, or null if the + * reference was cleared. + */ + public Object get() + { + /* Why is this overloaded??? + * Maybe for a kind of LRU strategy. */ + return super.get(); + } +} |