1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.internal.util;
18 
19 /**
20  * Helper class that contains a strong reference to a VirtualRefBase native
21  * object. This will incStrong in the ctor, and decStrong in the finalizer
22  */
23 public final class VirtualRefBasePtr {
24     private long mNativePtr;
25 
VirtualRefBasePtr(long ptr)26     public VirtualRefBasePtr(long ptr) {
27         mNativePtr = ptr;
28         nIncStrong(mNativePtr);
29     }
30 
get()31     public long get() {
32         return mNativePtr;
33     }
34 
release()35     public void release() {
36         if (mNativePtr != 0) {
37             nDecStrong(mNativePtr);
38             mNativePtr = 0;
39         }
40     }
41 
42     @Override
finalize()43     protected void finalize() throws Throwable {
44         try {
45             release();
46         } finally {
47             super.finalize();
48         }
49     }
50 
nIncStrong(long ptr)51     private static native void nIncStrong(long ptr);
nDecStrong(long ptr)52     private static native void nDecStrong(long ptr);
53 }
54