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      1 /*
      2  * Copyright (C) 2016 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 import com.android.layoutlib.bridge.impl.DelegateManager;
     20 import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
     21 
     22 import android.util.LongSparseLongArray;
     23 
     24 /**
     25  * Delegate used to provide new implementation the native methods of {@link VirtualRefBasePtr}
     26  *
     27  * Through the layoutlib_create tool, the original native  methods of VirtualRefBasePtr have been
     28  * replaced by calls to methods of the same name in this delegate class.
     29  *
     30  */
     31 @SuppressWarnings("unused")
     32 public class VirtualRefBasePtr_Delegate {
     33     private static final DelegateManager<Object> sManager = new DelegateManager<>(Object.class);
     34     private static final LongSparseLongArray sRefCount = new LongSparseLongArray();
     35 
     36     @LayoutlibDelegate
     37     /*package*/ static synchronized void nIncStrong(long ptr) {
     38         long counter = sRefCount.get(ptr);
     39         sRefCount.put(ptr, ++counter);
     40     }
     41 
     42     @LayoutlibDelegate
     43     /*package*/ static synchronized void nDecStrong(long ptr) {
     44         long counter = sRefCount.get(ptr);
     45 
     46         if (counter > 1) {
     47             sRefCount.put(ptr, --counter);
     48         } else {
     49             sRefCount.delete(ptr);
     50             sManager.removeJavaReferenceFor(ptr);
     51         }
     52     }
     53 }
     54