org.dbforms.servlets.reports
Class ReportServletAbstract

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          org.dbforms.servlets.reports.ReportServletAbstract

All Implemented Interfaces:

Serializable, Servlet, ServletConfig

Direct Known Subclasses:

JasperReportServlet, LineReportServletAbstract

public abstract class ReportServletAbstract
extends HttpServlet

This is the abstract base class for generating reports.

Author:

Henner Kollmann

See Also:

Serialized Form

Constructor Summary

ReportServletAbstract()

Method Summary

protected void	compileReport(ServletContext context, String reportFile)
void	doGet(HttpServletRequest request, HttpServletResponse response) Basic servlet method, answers requests from the browser.
void	doPost(HttpServletRequest request, HttpServletResponse response) Basic servlet method, answers requests fromt the browser.
protected abstract String	getReportFileExtension()
protected void	handleException(HttpServletRequest request, HttpServletResponse response, Exception e)
void	init() Initialize this servlet.
protected void	process(HttpServletRequest request, HttpServletResponse response) generates a report from request.
protected abstract ReportWriter	processReport(String reportFileFullName, JRDataSourceAbstract dataSource, ServletContext context, HttpServletRequest request, HttpServletResponse response) generates a report.

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReportServletAbstract

public ReportServletAbstract()

Method Detail

doGet

public final void doGet(HttpServletRequest request,
                        HttpServletResponse response)
                 throws ServletException,
                        IOException

Basic servlet method, answers requests from the browser.

Overrides:

doGet in class HttpServlet

Parameters:

request - HTTPServletRequest

response - HTTPServletResponse

Throws:

ServletException - if there is a servlet problem.

IOException - if there is an I/O problem.

doPost

public final void doPost(HttpServletRequest request,
                         HttpServletResponse response)
                  throws ServletException,
                         IOException

Basic servlet method, answers requests fromt the browser.

Overrides:

doPost in class HttpServlet

Parameters:

request - HTTPServletRequest

response - HTTPServletResponse

Throws:

ServletException - if there is a servlet problem.

IOException - if there is an I/O problem.

init

public void init()
          throws ServletException

Initialize this servlet.

Overrides:

init in class GenericServlet

Throws:

ServletException - if we cannot configure ourselves correctly

processReport

protected abstract ReportWriter processReport(String reportFileFullName,
                                              JRDataSourceAbstract dataSource,
                                              ServletContext context,
                                              HttpServletRequest request,
                                              HttpServletResponse response)

generates a report.

Parameters:

reportFileFullName - filename of report to process reportHTTPServletRequest generated by getReportFile! getReportFile should be called before fetching data, so that error handling of report not found e.g. could be processed first!

dataSource - data for the report

context - ServletContext

request - HTTPServletRequest

response - HTTPServletResponse

getReportFileExtension

protected abstract String getReportFileExtension()

handleException

protected final void handleException(HttpServletRequest request,
                                     HttpServletResponse response,
                                     Exception e)

compileReport

protected void compileReport(ServletContext context,
                             String reportFile)
                      throws Exception

Throws:

Exception

process

protected void process(HttpServletRequest request,
                       HttpServletResponse response)

generates a report from request. Tries to get data from DbForms.

Parameters:

request - HTTPServletRequest

response - HTTPServletResponse