Package org.apache.activemq.web.filter

Class ApplicationContextFilter

java.lang.Object

org.apache.activemq.web.filter.ApplicationContextFilter

All Implemented Interfaces:

Filter

public class ApplicationContextFilter
extends Object
implements Filter

Exposes Spring ApplicationContexts to JSP EL and other view technologies. Currently a variable is placed in application scope (by default called 'applicationContext') so that POJOs can be pulled out of Spring in a JSP page to render things using EL expressions.
e.g. ${applicationContext.cheese} would access the cheese POJO. Or ${applicationContext.cheese.name} would access the name property of the cheese POJO.
You can then use JSTL to work with these POJOs such as <c.set var="myfoo" value="${applicationContext.foo}"/>
In addition to applicationContext a 'requestContext' variable is created which will automatically bind any request parameters to the POJOs extracted from the applicationContext - which is ideal for POJOs which implement queries in view technologies.

Constructor Summary

Constructors

Constructor	Description
ApplicationContextFilter()

Method Summary

Modifier and Type	Method	Description
protected Object	bindRequestBean(Object bean, ServletRequest request)	Binds properties from the request parameters to the given POJO which is useful for POJOs which are configurable via request parameters such as for query/view POJOs
protected Map	createApplicationContextWrapper(org.springframework.web.context.WebApplicationContext context)	Creates a wrapper around the web application context so that it can be accessed easily from inside JSP EL (or other expression languages in other view technologies).
protected Map	createRequestContextWrapper(ServletRequest request)	Creates a wrapper around the request context (e.g.
void	destroy()
void	doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
String	getApplicationContextName()
protected String	getInitParameter(FilterConfig config, String key, String defaultValue)
String	getRequestContextName()
ServletContext	getServletContext()
void	init(FilterConfig config)
void	setApplicationContextName(String variableName)
void	setRequestContextName(String requestContextName)

Methods inherited from class java.lang.Object

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

Constructor Detail

ApplicationContextFilter

public ApplicationContextFilter()

Method Detail

init

public void init(FilterConfig config)
          throws ServletException

Specified by:

init in interface Filter

Throws:

ServletException

doFilter

public void doFilter(ServletRequest request,
                     ServletResponse response,
                     FilterChain chain)
              throws IOException,
                     ServletException

Specified by:

doFilter in interface Filter

Throws:

IOException

ServletException

destroy

public void destroy()

Specified by:

destroy in interface Filter

getServletContext

public ServletContext getServletContext()

getApplicationContextName

public String getApplicationContextName()

setApplicationContextName

public void setApplicationContextName(String variableName)

getRequestContextName

public String getRequestContextName()

setRequestContextName

public void setRequestContextName(String requestContextName)

getInitParameter

protected String getInitParameter(FilterConfig config,
                                  String key,
                                  String defaultValue)

createApplicationContextWrapper

protected Map createApplicationContextWrapper(org.springframework.web.context.WebApplicationContext context)

Creates a wrapper around the web application context so that it can be accessed easily from inside JSP EL (or other expression languages in other view technologies).

createRequestContextWrapper

protected Map createRequestContextWrapper(ServletRequest request)

Creates a wrapper around the request context (e.g. to allow POJOs to be auto-injected from request parameter values etc) so that it can be accessed easily from inside JSP EL (or other expression languages in other view technologies).

bindRequestBean

protected Object bindRequestBean(Object bean,
                                 ServletRequest request)

Binds properties from the request parameters to the given POJO which is useful for POJOs which are configurable via request parameters such as for query/view POJOs