protected Object restoreChild(int index) 
{
      final ReportState master = (ReportState) getMaster();
      if (master == null)
      {
        return null;
      }
      final int max = getChildPos(index);
      try
      {
        return this.restoreState(max, master);
      }
      catch (ReportProcessingException rpe)
      {
        return null;
      }
}

Function to restore the state of a child after the child was garbage collected.

 protected ReportState restoreState(int count,
    ReportState rootstate) throws ReportProcessingException 
{
      if (rootstate == null)
      {
        throw new NullPointerException("Master is null");
      }
      ReportState state = rootstate;
      ReportStateProgress progress = null;
      for (int i = 0; i < = count; i++)
      {
        progress = state.createStateProgress(progress);
        state = master.getReportProcessor().processPage(state, master.getDummyWriter());
        set(state, i + 1);
        if (state.isFinish())
        {
          return state;
        }
        if (state.isProceeding(progress) == false)
        {
          return null;
        }
      }
      return state;
}

Internal handler function restore a state. Count denotes the number of pages required to be processed to restore the page, when the reportstate master is used as source element.