1 /*
   2  * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.memory;
  26 
  27 //These definitions should be kept in sync with the definitions in the HotSpot code.
  28 
  29 public enum ReferenceType {
  30   REF_NONE ("None reference"),       // Regular class
  31   REF_OTHER ("Other reference"),     // Subclass of java/lang/ref/Reference, but not subclass of one of the classes below
  32   REF_SOFT ("Soft reference"),       // Subclass of java/lang/ref/SoftReference
  33   REF_WEAK ("Weak reference"),       // Subclass of java/lang/ref/WeakReference
  34   REF_FINAL ("Final reference"),     // Subclass of java/lang/ref/FinalReference
  35   REF_PHANTOM ("Phantom reference"); // Subclass of java/lang/ref/PhantomReference
  36 
  37   private final String value;
  38 
  39   ReferenceType(String val) {
  40     this.value = val;
  41   }
  42   public String value() {
  43     return value;
  44   }
  45 }