Package org.apache.hadoop.lib.servlet

Class HostnameFilter

java.lang.Object

org.apache.hadoop.lib.servlet.HostnameFilter

All Implemented Interfaces:

javax.servlet.Filter

@Private
public class HostnameFilter
extends Object
implements javax.servlet.Filter

Filter that resolves the requester hostname.

Constructor Summary

Constructors

Constructor	Description
HostnameFilter()

Method Summary

Modifier and Type	Method	Description
void	destroy()	Destroys the filter.
void	doFilter(javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, javax.servlet.FilterChain chain)	Resolves the requester hostname and delegates the request to the chain.
static String	get()	Returns the requester hostname.
void	init(javax.servlet.FilterConfig config)	Initializes the filter.

Methods inherited from class java.lang.Object

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

Constructor Details

HostnameFilter

public HostnameFilter()

Method Details

init

public void init(javax.servlet.FilterConfig config)
          throws javax.servlet.ServletException

Initializes the filter.

This implementation is a NOP.

Specified by:

init in interface javax.servlet.Filter

Parameters:

config - filter configuration.

Throws:

javax.servlet.ServletException - thrown if the filter could not be initialized.

doFilter

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

Resolves the requester hostname and delegates the request to the chain.

The requester hostname is available via the get() method.

Specified by:

doFilter in interface javax.servlet.Filter

Parameters:

request - servlet request.

response - servlet response.

chain - filter chain.

Throws:

IOException - thrown if an IO error occurs.

javax.servlet.ServletException - thrown if a servlet error occurs.

get

public static String get()

Returns the requester hostname.

Returns:

the requester hostname.

destroy

public void destroy()

Destroys the filter.

This implementation is a NOP.

Specified by:

destroy in interface javax.servlet.Filter