content: /*
   * Copyright (C) 2015 AChep@xda <artemchep@gmail.com>
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   * MA  02110-1301, USA.
   */
  package com.achep.acdisplay.utils.tasks;
  
  import android.content.Context;
  import androidx.annotation.NonNull;
  import androidx.annotation.Nullable;
  
  import com.achep.base.Device;
  
  import java.lang.ref.Reference;
  import java.lang.ref.SoftReference;
  
  /**
   * @author Artem Chepurnoy
   */
  public abstract class RunningTasks {
  
      @NonNull
      private static Reference<RunningTasks> sFactoryRef = new SoftReference<>(null);
  
      @NonNull
      public static RunningTasks getInstance() {
          RunningTasks factory = sFactoryRef.get();
          if (factory == null) {
              factory = newInstance();
              sFactoryRef = new SoftReference<>(factory);
              return factory;
          }
          return factory;
      }
  
      @NonNull
      private static RunningTasks newInstance() {
          if (Device.hasLollipopApi()) {
              return new RunningTasksLollipop();
          }
  
          return new RunningTasksJellyBean();
      }
  
      /**
       * Gets the package name of top running activity.
       */
      @Nullable
      public abstract String getRunningTasksTop(@NonNull Context context);
  
  }
  