sunlabs.brazil.filter
Class ReFilter

java.lang.Object
  sunlabs.brazil.filter.ReFilter (view source)

All Implemented Interfaces:

Filter, Handler

public class ReFilter
extends Object
implements Filter

Filter to replace text content via a reqular expression substitution. See Regexp.sub(java.lang.String, java.lang.String) and Regexp.subAll(java.lang.String, java.lang.String).

Note: The regular expression processing should be consolodated with the RePollHandler, and the tag_extract... processing.

The following server properties are used:

re

The regular expression to match the content

sub

The replacement expression. If not specified, the matched content is deleted.

oneOnly

If set, only replace the first match. by default, all matches are replaced.

noCase

If set, case-insensitive matchins is performed.

Constructor Summary

ReFilter()

Method Summary

byte[]	filter(Request request, MimeHeaders headers, byte[] content) If the content matches the regular expression, do the substitution.
boolean	init(Server server, String prefix) Initializes the handler.
boolean	respond(Request request) This is the request object before the content was fetched
boolean	shouldFilter(Request request, MimeHeaders headers) Only filter text documents

Methods inherited from class java.lang.Object

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

Constructor Detail

ReFilter

public ReFilter()

Method Detail

init

public boolean init(Server server,
                    String prefix)

Description copied from interface: Handler

Initializes the handler.

Specified by:

init in interface Handler

Parameters:

server - The HTTP server that created this Handler. Typical Handlers will use Server.props to obtain run-time configuration information.

prefix - The handlers name. The string this Handler may prepend to all of the keys that it uses to extract configuration information from Server.props. This is set (by the Server and ChainHandler) to help avoid configuration parameter namespace collisions.

Returns:

true if this Handler initialized successfully, false otherwise. If false is returned, this Handler should not be used.

respond

public boolean respond(Request request)

This is the request object before the content was fetched

Specified by:

respond in interface Handler

Parameters:

request - The Request object that represents the HTTP request.

Returns:

true if the request was handled. A request was handled if a response was supplied to the client, typically by calling Request.sendResponse() or Request.sendError.

shouldFilter

public boolean shouldFilter(Request request,
                            MimeHeaders headers)

Only filter text documents

Specified by:

shouldFilter in interface Filter

Parameters:

request - The in-progress HTTP request.

headers - The MIME headers generated by the wrapped Handler.

Returns:

true if this filter would like to examine and possibly rewrite the content, false otherwise.

filter

public byte[] filter(Request request,
                     MimeHeaders headers,
                     byte[] content)

If the content matches the regular expression, do the substitution. Otherwise, return the original content un-changed.

Specified by:

filter in interface Filter

Parameters:

request - The finished HTTP request.

headers - The MIME headers generated by the Handler.

content - The output from the Handler that this Filter may rewrite.

Returns:

The rewritten content. The Filter may return the original content unchanged. The Filter may return null to indicate that the FilterHandler should stop processing the request and should not return any content to the client.