code: @Override
  	protected void checkHandle(int handle) throws DataStoreException
      {
          if (handle < 0 ||
              handle >= blockCount ||
              allocatedSize[handle] == -1 ||
              (flags[handle] & FLAG_START_BLOCK) == 0)
              throw new DataStoreException("Invalid handle : "+handle);
      }
docs: /* (non-Javadoc)
  @see net.timewalker.ffmq4.storage.data.impl.AbstractDataStore#checkHandle(int)