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.tv.settings.widget; 18 19 public class RefcountObject<T> { 20 21 public static interface RefcountListener { 22 public void onRefcountZero(RefcountObject<?> object); 23 } 24 25 private RefcountObject.RefcountListener mRefcountListener; 26 private int mRefcount; 27 private final T mObject; 28 29 public RefcountObject(T object) { 30 mObject = object; 31 } 32 33 public void setRefcountListener(RefcountObject.RefcountListener listener) { 34 mRefcountListener = listener; 35 } 36 37 public synchronized int addRef() { 38 mRefcount++; 39 return mRefcount; 40 } 41 42 public synchronized int releaseRef() { 43 mRefcount--; 44 if (mRefcount == 0 && mRefcountListener != null) { 45 mRefcountListener.onRefcountZero(this); 46 } 47 return mRefcount; 48 } 49 50 public synchronized int getRef() { 51 return mRefcount; 52 } 53 54 public T getObject() { 55 return mObject; 56 } 57 } 58
