1 /*
   2  * Copyright (c) 2011, 2012, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package com.apple.jobjc;
  26 
  27 import javax.tools.annotation.GenerateNativeHeader;
  28 
  29 /* No native methods here, but the constants are needed in the supporting JNI code */
  30 @GenerateNativeHeader
  31 public class Pointer <T> implements Comparable<Pointer<T>>{
  32     long ptr;
  33 
  34     protected Pointer(final long ptr) {
  35         this.ptr = ptr;
  36         getNativeObjectLifecycleManager().begin(ptr);
  37     }
  38 
  39     @Override protected final synchronized void finalize() throws Throwable {
  40         long pptr = ptr;
  41         ptr = 0;
  42         if (pptr != 0) getNativeObjectLifecycleManager().end(pptr);
  43     }
  44 
  45     protected NativeObjectLifecycleManager getNativeObjectLifecycleManager() {
  46         return NativeObjectLifecycleManager.Nothing.INST;
  47     }
  48 
  49     @Override public boolean equals(Object o) {
  50         return o instanceof Pointer && ptr == ((Pointer) o).ptr;
  51     }
  52 
  53     @Override public int hashCode() { return (int)(ptr^(ptr>>>32)); }
  54 
  55     public int compareTo(Pointer<T> o) {
  56         if(this==o || ptr==o.ptr) return 0;
  57         if(ptr < o.ptr) return -1;
  58         return 1;
  59     }
  60 }