org.deegree_impl.enterprise
Class AbstractOGCServlet

java.lang.Object
  HttpServlet
      org.deegree_impl.enterprise.AbstractOGCServlet

Direct Known Subclasses:

WCSServlet, WFSServlet, WMSServlet, WTSServlet

public abstract class AbstractOGCServlet

extends HttpServlet

Abstract servlet that serves as an OCC-compliant HTTP-frontend to any OGC-WebService (WFS, WMS, ...).

Version:

$Revision: 1.14 $ $Date: 2004/03/12 15:56:47 $

Author:

Markus Schneider

See Also:

Serialized Form

Nested Class Summary

protected class

AbstractOGCServlet.Reloader Inner class that is used to monitor the configuration file (capabilities-file).

Field Summary

protected java.net.URL	capabilitiesURL
AbstractOGCServlet.Reloader	reloader

Constructor Summary

AbstractOGCServlet()

Method Summary

void	destroy() Called by the servlet container to indicate to a servlet that the servlet is being taken out of service.
protected void	enableReloader() Enables reloading mechanism on configuration file changes.
protected java.util.HashMap	getParamMap(HttpServletRequest request) Returns HTTP-parameters of a HttpServletRequest as a HashMap object.
protected void	handleError(java.lang.Exception ex, HttpServletResponse response) handles fatal errors by creating a OGC exception XML and sending it back to the client
void	init(ServletConfig servletConfig) Called by the servlet container to indicate that the servlet is being placed into service.
protected abstract void	initService() Called when a reinitialization of the service is necessary, e.g.

Methods inherited from class java.lang.Object

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

Field Detail

reloader

public AbstractOGCServlet.Reloader reloader

capabilitiesURL

protected java.net.URL capabilitiesURL

Constructor Detail

AbstractOGCServlet

public AbstractOGCServlet()

Method Detail

init

public void init(ServletConfig servletConfig)
          throws ServletException

Called by the servlet container to indicate that the servlet is being placed into service. Sets the debug level according to the debug parameter defined in the ServletEngine's environment.

NOTE: Everything that gets called by this method should not use Debug.xxx () to produce messages, but 'getServletContext.log ()'.

Parameters:

servletConfig - servlet configuration

Throws:

ServletException - exception if something occurred that interferes with the servlet's normal operation

destroy

public void destroy()

Called by the servlet container to indicate to a servlet that the servlet is being taken out of service. Stops the Reloader Thread, if running.

getParamMap

protected java.util.HashMap getParamMap(HttpServletRequest request)

Returns HTTP-parameters of a HttpServletRequest as a HashMap object.

Parameters:

request - source of the data

Returns:

keys are parameter-names, values are parameter values

enableReloader

protected void enableReloader()

Enables reloading mechanism on configuration file changes. Runs as a separate Thread. The file that is monitored is specified by the init parameter "capabilities" in the servlet container. Monitor frequency can be adjusted by the parameter "updateFrequency".

initService

protected abstract void initService()

Called when a reinitialization of the service is necessary, e.g. the configuration file has been altered.

handleError

protected void handleError(java.lang.Exception ex,
                           HttpServletResponse response)

handles fatal errors by creating a OGC exception XML and sending it back to the client