content: //
  //  Copyright (c) 2014 VK.com
  //
  //  Permission is hereby granted, free of charge, to any person obtaining a copy of
  //  this software and associated documentation files (the "Software"), to deal in
  //  the Software without restriction, including without limitation the rights to
  //  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
  //  the Software, and to permit persons to whom the Software is furnished to do so,
  //  subject to the following conditions:
  //
  //  The above copyright notice and this permission notice shall be included in all
  //  copies or substantial portions of the Software.
  //
  //  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  //  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
  //  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
  //  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  //  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  //  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  //
  
  package com.vk.sdk;
  
  import java.util.HashMap;
  import java.util.Random;
  
  public class VKObject {
      private static final HashMap<Long, VKObject> sRegisteredObjects;
      private long mRegisteredObjectId = 0;
      static {
          sRegisteredObjects = new HashMap<Long, VKObject>();
      }
  
      /**
       * Returns object saved in local cache
       * @param registeredObjectId Registered object id
       * @return Object which was saved with registerObject() method
       */
      public static VKObject getRegisteredObject(long registeredObjectId) {
          return sRegisteredObjects.get(registeredObjectId);
      }
  
      /**
       * Saves object in local cache for future use. Always call unregisterObject() after use
       * @return Registered object id
       */
      public long registerObject() {
          Random rand = new Random();
          while (true) {
              long nextRand = rand.nextLong();
              if (sRegisteredObjects.containsKey(nextRand))
                  continue;
              if (nextRand == 0)
                  continue;
              sRegisteredObjects.put(nextRand, this);
              mRegisteredObjectId = nextRand;
              return nextRand;
          }
      }
  
      /**
       * Unregister object from local cache.
       */
      public void unregisterObject() {
          sRegisteredObjects.remove(mRegisteredObjectId);
          mRegisteredObjectId = 0;
      }
  
  }
  