ro.isdc.wro.http.support
Class ServletContextAttributeHelper

java.lang.Object
  ro.isdc.wro.http.support.ServletContextAttributeHelper

public class ServletContextAttributeHelper
extends Object

Encapsulates the details of storing/retrieving attributes from ServletContext.
This class know how to handle multiple WroFilter & WroServletContextListener configurations, by setting the attributes with a unique key computed based on provided name (using getName(). Use this class to retrieve wro4j related attributes, instead of hard-coding the name of the attribute to retrieve.

Usage scenario:

• This is the most common use-case, when there is a single WroFilter and a WroServletContextListener configured in web.xml. In order to retrieve/store attributes in servlet context use:

   ServletContextAttributeHelper helper = new ServletContextAttributeHelper(servletContext);
   WroConfiguration config = helper.getWroConfiguration();
   WroManagerFactory managerFactory = helper.getManagerFactory();
   

• When there are multiple WroFilter configurations in web.xml (each should have a dedicated listener extended form WroServletContextListener). In order to retrieve/store attributes in servlet context use:

         String name = ..//the name of the filter (defined in init-param called name). 
         ServletContextAttributeHelper helper = new ServletContextAttributeHelper(servletContext, name);
         WroConfiguration config = helper.getWroConfiguration();
         WroManagerFactory managerFactory = helper.getManagerFactory();
   

• When there are multiple WroFilter configurations in web.xml, you can retrieve/store attributes from within a filter using:

   ServletContextAttributeHelper helper = ServletContextAttributeHelper.create(filterConfig);
   WroConfiguration config = helper.getWroConfiguration();
   WroManagerFactory managerFactory = helper.getManagerFactory();
   

  This example is similar to previous, except that the name of the filter will be extracted in the factory method.

Since:

1.4.6

Author:

Alex Objelean

Field Summary

static String

DEFAULT_NAME Default value of the name init param.

Constructor Summary

ServletContextAttributeHelper(javax.servlet.ServletContext servletContext)
Uses default name for storing/retrieving attributes in ServletContext.

ServletContextAttributeHelper(javax.servlet.ServletContext servletContext, String name)
Uses default name to work with ServletContext attribute.

Method Summary

void	clear() Remove all attributes from ServletContext.
static ServletContextAttributeHelper	create(javax.servlet.FilterConfig filterConfig) Factory method which uses default name for storing/retrieving attributes in ServletContext.
WroManagerFactory	getManagerFactory()
WroConfiguration	getWroConfiguration()
void	setManagerFactory(WroManagerFactory managerFactory) Set the configuration object as a servletContext attribute.
void	setWroConfiguration(WroConfiguration config) Set the configuration object as a servletContext attribute.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_NAME

public static final String DEFAULT_NAME

Default value of the name init param. This one is used when no value is defined.

See Also:

Constant Field Values

Constructor Detail

ServletContextAttributeHelper

public ServletContextAttributeHelper(javax.servlet.ServletContext servletContext)

Uses default name for storing/retrieving attributes in ServletContext.

ServletContextAttributeHelper

public ServletContextAttributeHelper(javax.servlet.ServletContext servletContext,
                                     String name)

Uses default name to work with ServletContext attribute.

Parameters:

servletContext - a not null ServletContext object.

name - of the listener for which the helper will be used.

Method Detail

create

public static ServletContextAttributeHelper create(javax.servlet.FilterConfig filterConfig)

Factory method which uses default name for storing/retrieving attributes in ServletContext.

getManagerFactory

public WroManagerFactory getManagerFactory()

Returns:

the WroManagerFactory stored in servletContext.

getWroConfiguration

public WroConfiguration getWroConfiguration()

Returns:

the WroConfiguration stored in servletContext.

setWroConfiguration

public void setWroConfiguration(WroConfiguration config)

Set the configuration object as a servletContext attribute.

setManagerFactory

public void setManagerFactory(WroManagerFactory managerFactory)

Set the configuration object as a servletContext attribute.

clear

public void clear()

Remove all attributes from ServletContext.