org.jboss.seam.captcha
Class Captcha

java.lang.Object
  org.jboss.seam.captcha.Captcha

All Implemented Interfaces:

Serializable

@Name(value="org.jboss.seam.captcha.captcha")
@Scope(value=SESSION)
@Install(precedence=0)
@BypassInterceptors
public class Captcha
extends Object
implements Serializable

Default CAPTCHA algorithm, a simple addition problem. May be extended and customized.

Author:

Gavin King

See Also:

Serialized Form

Constructor Summary

Captcha()

Method Summary

protected String	getChallenge() Get the challenge question
protected Color	getChallengeBackgroundColor() May be overridden by subclasses
protected int	getChallengeImageWidth() May be overridden by subclasses
protected Color	getChallengeTextColor() May be overridden by subclasses
String	getResponse()
void	init() Initialize the challenge and correct response.
static Captcha	instance()
BufferedImage	renderChallenge() Render the challenge question as an image.
protected void	setChallenge(String challenge) Set the challenge question
protected void	setCorrectResponse(String correctResponse) Set the correct response
void	setResponse(String input)
boolean	validateResponse(String response) Validate that the entered response is the correct response

Methods inherited from class java.lang.Object

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

Constructor Detail

Captcha

public Captcha()

Method Detail

init

@Create
public void init()

Initialize the challenge and correct response. May be overridden and customized by a subclass.

setChallenge

protected void setChallenge(String challenge)

Set the challenge question

getChallenge

protected String getChallenge()

Get the challenge question

setCorrectResponse

protected void setCorrectResponse(String correctResponse)

Set the correct response

validateResponse

public boolean validateResponse(String response)

Validate that the entered response is the correct response

getResponse

@CaptchaResponse
public String getResponse()

setResponse

public void setResponse(String input)

renderChallenge

public BufferedImage renderChallenge()

Render the challenge question as an image. May be overridden by subclasses to achieve a stronger CAPTCHA.

getChallengeImageWidth

protected int getChallengeImageWidth()

May be overridden by subclasses

Returns:

the width, in pixels, of the challenge question

getChallengeBackgroundColor

protected Color getChallengeBackgroundColor()

May be overridden by subclasses

Returns:

the background color of the challenge image

getChallengeTextColor

protected Color getChallengeTextColor()

May be overridden by subclasses

Returns:

@return the foreground color of the challenge image

instance

public static Captcha instance()