de.fhg.igd.semoa.web.servlet
Class ImageServlet

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          de.fhg.igd.semoa.web.servlet.ImageServlet

All Implemented Interfaces:

Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

Direct Known Subclasses:

GPSServlet

public abstract class ImageServlet

extends javax.servlet.http.HttpServlet

See Also:

Serialized Form

Field Summary

protected Cache	imageCache_
private static Logger	log_ The Logger instance for this class
protected Color	transparentColor_
protected Cache	typeCache_

Fields inherited from class javax.servlet.http.HttpServlet

Fields inherited from class javax.servlet.GenericServlet

Constructor Summary

ImageServlet()

Method Summary

protected abstract BufferedImage	createImage(javax.servlet.http.HttpServletRequest request)
void	doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
void	doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
protected long	getCacheLifespan()
private String	getQueryString(javax.servlet.http.HttpServletRequest request)
protected Color	getTransparentColor()
protected abstract boolean	imageHasChanged(javax.servlet.http.HttpServletRequest request)
void	init(javax.servlet.ServletConfig servletConfig)
protected void	setTransparentColor(Color transparentColor)
private void	writeImage(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, BufferedImage image)

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

Field Detail

log_

private static Logger log_

The Logger instance for this class

transparentColor_

protected Color transparentColor_

imageCache_

protected Cache imageCache_

typeCache_

protected Cache typeCache_

Constructor Detail

ImageServlet

public ImageServlet()

Method Detail

getCacheLifespan

protected long getCacheLifespan()

init

public void init(javax.servlet.ServletConfig servletConfig)
          throws javax.servlet.ServletException

Throws:

javax.servlet.ServletException

getQueryString

private String getQueryString(javax.servlet.http.HttpServletRequest request)

setTransparentColor

protected void setTransparentColor(Color transparentColor)

getTransparentColor

protected Color getTransparentColor()

writeImage

private void writeImage(javax.servlet.http.HttpServletRequest request,
                        javax.servlet.http.HttpServletResponse response,
                        BufferedImage image)
                 throws IOException

Throws:

IOException

doPost

public void doPost(javax.servlet.http.HttpServletRequest request,
                   javax.servlet.http.HttpServletResponse response)

doGet

public void doGet(javax.servlet.http.HttpServletRequest request,
                  javax.servlet.http.HttpServletResponse response)

createImage

protected abstract BufferedImage createImage(javax.servlet.http.HttpServletRequest request)

imageHasChanged

protected abstract boolean imageHasChanged(javax.servlet.http.HttpServletRequest request)