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   package fr.paris.lutece.plugins.dataviz.web;
   
   import fr.paris.lutece.plugins.dataviz.service.StatNotFoundException;
   import fr.paris.lutece.plugins.dataviz.service.StatsService;
  import fr.paris.lutece.util.json.ErrorJsonResponse;
  import fr.paris.lutece.util.json.JsonUtil;
  
  import java.io.IOException;
  
  import javax.servlet.ServletException;
  import javax.servlet.ServletOutputStream;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  
  /**
   * Class for format stat into Json
   */
  public class StatServlet extends HttpServlet
  {
      private static final String CONTENT_TYPE_JSON = "application/json";
      private static final String PARAMETER_NAME = "name";
  
      @Override
      protected void service( HttpServletRequest req, HttpServletResponse resp )
          throws ServletException, IOException
      {
          String strName = req.getParameter( PARAMETER_NAME );
  
          String strOutput;
  
          try
          {
              strOutput = StatsService.instance(  ).getStat( strName );
          }
          catch ( StatNotFoundException ex )
          {
              ErrorJsonResponse error = new ErrorJsonResponse( "1", ex.getMessage(  ) );
              strOutput = JsonUtil.buildJsonResponse( error );
          }
  
          ServletOutputStream out = resp.getOutputStream(  );
  
          resp.setContentType( CONTENT_TYPE_JSON );
          out.print( strOutput );
          out.flush(  );
          out.close(  );
      }
  }