Module org.omnifaces

Package org.omnifaces.filter

Class MutableRequestFilter

java.lang.Object

org.omnifaces.filter.HttpFilter

org.omnifaces.filter.MutableRequestFilter

All Implemented Interfaces:

Filter

public class MutableRequestFilter
extends HttpFilter

The MutableRequestFilter will wrap the incoming HttpServletRequest in a MutableRequestFilter.MutableRequest so that the developer can mutate the headers and parameters in such way that the outcome of among others HttpServletRequest.getHeader(String) and ServletRequest.getParameter(String) are influenced.

Installation

To get this filter to run, map it as follows in web.xml:

 <filter>
     <filter-name>mutableRequestFilter</filter-name>
     <filter-class>org.omnifaces.filter.MutableRequestFilter</filter-class>
 </filter>
 <filter-mapping>
     <filter-name>mutableRequestFilter</filter-name>
     <url-pattern>/*</url-pattern>
 </filter-mapping>
 

The ordering of the <filter-mapping> is significant. The MutableRequestFilter.MutableRequest is not available in any filter which is mapped before the MutableRequestFilter.

Usage

When inside FacesContext, use Faces.getMutableRequestHeaderMap() or Faces.getMutableRequestParameterMap(). Or when having only a HttpServletRequest at hands, use Servlets.getMutableRequestHeaderMap(HttpServletRequest) or Servlets.getMutableRequestParameterMap(HttpServletRequest).

Since:

3.14

Author:

Bauke Scholtz

See Also:

• HttpFilter
• MutableRequestFilter.MutableRequest

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	MutableRequestFilter.MutableRequest

Field Summary

Fields

Modifier and Type	Field	Description
static final String	MUTABLE_REQUEST	The name of the request attribute under which the MutableRequestFilter.MutableRequest will be stored.

Constructor Summary

Constructors

Constructor	Description
MutableRequestFilter()

Method Summary

Modifier and Type	Method	Description
void	doFilter(HttpServletRequest request, HttpServletResponse response, HttpSession session, FilterChain chain)	Creates and sets the mutable request.
static MutableRequestFilter.MutableRequest	getMutableRequest(HttpServletRequest request)	Returns the mutable request.
void	init()	Tracks whether this filter is installed.

Methods inherited from class org.omnifaces.filter.HttpFilter

destroy, doFilter, getFilterConfig, getInitParameter, getServletContext, init

Methods inherited from class java.lang.Object

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

Field Details

MUTABLE_REQUEST

public static final String MUTABLE_REQUEST

The name of the request attribute under which the MutableRequestFilter.MutableRequest will be stored.

See Also:

• Constant Field Values

Constructor Details

MutableRequestFilter

public MutableRequestFilter()

Method Details

init

public void init()
          throws ServletException

Tracks whether this filter is installed.

Overrides:

init in class HttpFilter

Throws:

ServletException - When filter's initialization failed.

doFilter

public void doFilter(HttpServletRequest request,
 HttpServletResponse response,
 HttpSession session,
 FilterChain chain)
              throws ServletException,
IOException

Creates and sets the mutable request.

Specified by:

doFilter in class HttpFilter

Parameters:

request - The HTTP request.

response - The HTTP response.

session - The HTTP session, if any, else null.

chain - The filter chain to continue.

Throws:

ServletException - As wrapper exception when something fails in the request processing.

IOException - Whenever something fails at I/O level.

See Also:

• Filter.doFilter(ServletRequest, ServletResponse, FilterChain)

getMutableRequest

public static MutableRequestFilter.MutableRequest getMutableRequest(HttpServletRequest request)

Returns the mutable request.

Returns:

The mutable request.

Throws:

IllegalStateException - When the MutableRequestFilter is not installed or not invoked yet.

Since:

3.14