org.mentawai.template
Class TemplateServlet

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          org.mentawai.template.TemplateServlet

All Implemented Interfaces:

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

Direct Known Subclasses:

JspTemplateServlet

public abstract class TemplateServlet
extends javax.servlet.http.HttpServlet

Classe abstrata base para TemplateServlets. Possui uma implementacao padrao, que e JspTemplateServlet, porem podem ser feitas outras, como FreemarkerTemplateServlet ou VelocityTemplateServlet

Author:

Davi Luan Carneiro

See Also:

Serialized Form

Field Summary

static String	CURRENT_VIEW_ATTR
static String	PAGE_ATTR
protected static String	TEMPLATE_MANAGER_ATTR Para acessar o initParam do web.xml

Constructor Summary

TemplateServlet()

Method Summary

protected void	doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Redireciona para processRequest.
protected void	doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Redireciona para processRequest.
static void	executeListener(Page page, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, javax.servlet.ServletContext application) Executa o Listener.
static String	extractPagePath(javax.servlet.http.HttpServletRequest request) Metodo utilitario que retorna o path da pagina, sem a extensao.
static TemplateManager	getTemplateManager() Retorna o TemplateManager.
void	init() O TemplateManager sera carregado no startup do container
protected void	processRequest(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Processa a requisicao, obtendo o path a partir da request e redirecionando para o metodo processTemplate
void	processTemplate(String path, TemplateManager manager, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, javax.servlet.ServletContext application) Processa o template, invocando o TemplateManager e redirecionando para o local adequado.
protected abstract void	putPageInResponse(Page page, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, javax.servlet.ServletContext application) Responsavel por colocar o Page na camada de visao.
static void	setTemplateManager(TemplateManager manager) Permite que o TemplateManager seja setado.
protected abstract void	showPage(Page page, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, javax.servlet.ServletContext application) Gera a saida do page no browser.

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

TEMPLATE_MANAGER_ATTR

protected static final String TEMPLATE_MANAGER_ATTR

Para acessar o initParam do web.xml

See Also:

Constant Field Values

PAGE_ATTR

public static final String PAGE_ATTR

See Also:

Constant Field Values

CURRENT_VIEW_ATTR

public static final String CURRENT_VIEW_ATTR

See Also:

Constant Field Values

Constructor Detail

TemplateServlet

public TemplateServlet()

Method Detail

init

public void init()
          throws javax.servlet.ServletException

O TemplateManager sera carregado no startup do container

Overrides:

init in class javax.servlet.GenericServlet

Throws:

javax.servlet.ServletException

getTemplateManager

public static TemplateManager getTemplateManager()

Retorna o TemplateManager. Por ser estatico, torna o TemplateManager disponivel a outras classes. Deve-se tomar cuidado, pois o TemplateManager so sera preenchido na primeira requisicao ao TemplateServlet. Antes disso, o seu valor e null.

Returns:

TemplateManager

setTemplateManager

public static void setTemplateManager(TemplateManager manager)

Permite que o TemplateManager seja setado. Nao e usado internamente, porem para darmos maxima flexibilidade a quem for usar (incluindo outros frameworks), incluimos este metodo.

Parameters:

manager - Instancia de TemplateManager

extractPagePath

public static String extractPagePath(javax.servlet.http.HttpServletRequest request)

Metodo utilitario que retorna o path da pagina, sem a extensao. Por exemplo: WEB-INF/views/mypage

Parameters:

request -

Returns:

Path da pagina

processRequest

protected void processRequest(javax.servlet.http.HttpServletRequest request,
                              javax.servlet.http.HttpServletResponse response)
                       throws javax.servlet.ServletException,
                              IOException

Processa a requisicao, obtendo o path a partir da request e redirecionando para o metodo processTemplate

Parameters:

request -

response -

Throws:

javax.servlet.ServletException

IOException

processTemplate

public void processTemplate(String path,
                            TemplateManager manager,
                            javax.servlet.http.HttpServletRequest request,
                            javax.servlet.http.HttpServletResponse response,
                            javax.servlet.ServletContext application)

Processa o template, invocando o TemplateManager e redirecionando para o local adequado. Este metodo invoca outros metodos abstratos, tornando-o bem generico. Se fosse criado um FreemarkerTemplateServlet, por exemplo, esta metodo provavelmente continuaria igual. Eh publico porque pode ser usado na integracao com frameworks web mvc.

Parameters:

path -

request -

response -

putPageInResponse

protected abstract void putPageInResponse(Page page,
                                          javax.servlet.http.HttpServletRequest request,
                                          javax.servlet.http.HttpServletResponse response,
                                          javax.servlet.ServletContext application)
                                   throws Exception

Responsavel por colocar o Page na camada de visao. A classe filha devera implementar este metodo. O JspTemplateServlet, por exemplo, implementa-o setando o Page na request. Se for algo chave-valor (provavelmente sera), procure por como chave a constante PAGE_ATTR

Parameters:

page -

request -

response -

Throws:

Exception

showPage

protected abstract void showPage(Page page,
                                 javax.servlet.http.HttpServletRequest request,
                                 javax.servlet.http.HttpServletResponse response,
                                 javax.servlet.ServletContext application)
                          throws Exception

Gera a saida do page no browser. Cada implementacao tera a sua propria.

Parameters:

page -

request -

response -

application -

Throws:

Exception

executeListener

public static void executeListener(Page page,
                                   javax.servlet.http.HttpServletRequest request,
                                   javax.servlet.http.HttpServletResponse response,
                                   javax.servlet.ServletContext application)
                            throws Exception

Executa o Listener. Esta como publico e estatico porque e usado pela taglib.

Parameters:

page -

request -

response -

application -

Throws:

Exception

doGet

protected void doGet(javax.servlet.http.HttpServletRequest request,
                     javax.servlet.http.HttpServletResponse response)
              throws javax.servlet.ServletException,
                     IOException

Redireciona para processRequest.

Overrides:

doGet in class javax.servlet.http.HttpServlet

Throws:

javax.servlet.ServletException

IOException

doPost

protected void doPost(javax.servlet.http.HttpServletRequest request,
                      javax.servlet.http.HttpServletResponse response)
               throws javax.servlet.ServletException,
                      IOException

Redireciona para processRequest.

Overrides:

doPost in class javax.servlet.http.HttpServlet

Throws:

javax.servlet.ServletException

IOException