org.apache.activemq.web.filter
Class ApplicationContextFilter

java.lang.Object
  extended by 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
ApplicationContextFilter()
           
 
Method Summary
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



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