org.xmlBlaster.engine.mime.regex
Class GnuRegexFilter

java.lang.Object
  org.xmlBlaster.engine.mime.regex.GnuRegexFilter

All Implemented Interfaces:

I_AccessFilter, I_Plugin

public class GnuRegexFilter
extends java.lang.Object
implements I_Plugin, I_AccessFilter

This regex plugin allows to filter message contents with regular expressions.

Message contents which don't match the regular expression are not send via update() or updateOneway() to the subscriber. The same filter may be used for the synchronous get() access and for clusters to map messages to master nodes.

Please register this plugin in xmlBlaster.properties:

 MimeAccessPlugin[GnuRegexFilter][1.0]=org.xmlBlaster.engine.mime.regex.GnuRegexFilter
 

Plugins must implement the I_Plugin interface to be loadable by the PluginManager and must implement the I_AccessFilter interface to be usable as a filter.

NOTE: Since JDK 1.4 we have a java.util.regex package, but regrettably this can't be used with JDK 1.2 or JDK 1.3. If you want to use Suns package just copy this class and code it with suns implementation in our match() method:

   import java.util.regex.Pattern;
   import java.util.regex.Matcher;
   ...

   query.setPreparedQuery(Pattern.compile(query.getQuery()));
   ...
   Matcher m = preparedQuery.matcher(msgUnit.getContentStr());
   return  m.matches();
 

Author:

xmlBlaster@marcelruff.info

See Also:

The GNU regex package

Field Summary

private ServerScope	glob
private static java.util.logging.Logger	log
private java.lang.String	ME

Constructor Summary

GnuRegexFilter()

Method Summary

java.lang.String[]	getMimeExtended() Get the content MIME version number for which this plugin applies
java.lang.String[]	getMimeTypes() Get the content MIME type for which this plugin applies
java.lang.String	getName() Get a human readable name of this filter implementation
java.lang.String	getType() Return plugin type for Plugin loader
java.lang.String	getVersion() Return plugin version for Plugin loader
void	init(Global glob, PluginInfo pluginInfo) This method is called by the PluginManager (enforced by I_Plugin).
void	initialize(ServerScope glob) This is called after instantiation of the plugin
boolean	match(SessionInfo receiver, MsgUnit msgUnit, Query query) Check if the filter rule matches for this message.
void	shutdown() Cleans up the resource.

Methods inherited from class java.lang.Object

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

Field Detail

ME

private final java.lang.String ME

See Also:

Constant Field Values

glob

private ServerScope glob

log

private static java.util.logging.Logger log

Constructor Detail

GnuRegexFilter

public GnuRegexFilter()

Method Detail

initialize

public void initialize(ServerScope glob)

This is called after instantiation of the plugin

Specified by:

initialize in interface I_AccessFilter

Parameters:

glob - The Global handle of this xmlBlaster server instance.

init

public void init(Global glob,
                 PluginInfo pluginInfo)

This method is called by the PluginManager (enforced by I_Plugin).

Specified by:

init in interface I_Plugin

See Also:

I_Plugin.init(org.xmlBlaster.util.Global,org.xmlBlaster.util.plugin.PluginInfo)

getType

public java.lang.String getType()

Return plugin type for Plugin loader

Specified by:

getType in interface I_Plugin

Returns:

"GnuRegexFilter"

getVersion

public java.lang.String getVersion()

Return plugin version for Plugin loader

Specified by:

getVersion in interface I_Plugin

Returns:

"1.0"

getName

public java.lang.String getName()

Get a human readable name of this filter implementation

Specified by:

getName in interface I_AccessFilter

Returns:

"GnuRegexFilter"

getMimeTypes

public java.lang.String[] getMimeTypes()

Get the content MIME type for which this plugin applies

Specified by:

getMimeTypes in interface I_AccessFilter

Returns:

"*" This plugin handles all mime types

getMimeExtended

public java.lang.String[] getMimeExtended()

Get the content MIME version number for which this plugin applies

Specified by:

getMimeExtended in interface I_AccessFilter

Returns:

"1.0" (this is the default version number)

match

public boolean match(SessionInfo receiver,
                     MsgUnit msgUnit,
                     Query query)
              throws XmlBlasterException

Check if the filter rule matches for this message.

Specified by:

match in interface I_AccessFilter

Parameters:

publisher - The subject object describing the publisher

receiver - The subject object describing the receiver

msgUnit - The message to check

query - The Query instance holding the regular expression from your filter.

Returns:

true The filter regex expression matches the message content.

Throws:

see - I_AccessFilter#match()

XmlBlasterException - Is thrown on problems, for example if the MIME type does not fit to message content.
Take care throwing an exception, the message is not updated and an error is logged and the message is sent as dead letter. (see TopicHandler.java:1032). It is best to return 'false' instead and handle the situation yourself.

shutdown

public void shutdown()

Description copied from interface: I_Plugin

Cleans up the resource.

Specified by:

shutdown in interface I_AccessFilter

Specified by:

shutdown in interface I_Plugin