org.qbroker.event

Class EventSelector

java.lang.Object

org.qbroker.event.EventSelector

All Implemented Interfaces:

Filter<Event>, EventFilter

public class EventSelector
extends java.lang.Object
implements EventFilter

EventSelector implements EventFilter for Perl5 patterns match with events

Author:

yannanlu@yahoo.com

Constructor Summary

Constructors

Constructor and Description
EventSelector(java.util.Map props)

Method Summary

Modifier and Type	Method and Description
void	clear()
static java.lang.String	coarseGrain(java.lang.String key, java.util.List list) It returns a Perl 5 pattern string on a specific key so that the returned pattern string is the result of OR on all the neccessary patterns in the pattern list.
boolean	evaluate(long currentTime, Event event) returns true if the filter matching with the event or false otherwise
static java.lang.String	expand(java.lang.String pattern, java.lang.String def) With given a default Perl 5 pattern string, it expands the pattern so that the result pattern can be ORed with other patterns.
protected void	finalize()

Methods inherited from class java.lang.Object

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

Constructor Detail

EventSelector

public EventSelector(java.util.Map props)

Method Detail

evaluate

public boolean evaluate(long currentTime,
                        Event event)

Description copied from interface: EventFilter

returns true if the filter matching with the event or false otherwise

Specified by:

evaluate in interface Filter<Event>

Specified by:

evaluate in interface EventFilter

coarseGrain

public static java.lang.String coarseGrain(java.lang.String key,
                                           java.util.List list)

It returns a Perl 5 pattern string on a specific key so that the returned pattern string is the result of OR on all the neccessary patterns in the pattern list. The result string is the coarse-grained of all patterns on the key. If it does not match a text, the original list of patterns will not match either. So the coarse-grained pattern can be used as a pre-filter.

expand

public static java.lang.String expand(java.lang.String pattern,
                                      java.lang.String def)

With given a default Perl 5 pattern string, it expands the pattern so that the result pattern can be ORed with other patterns. The expanded pattern may not be same as the original one. But in order to match the original pattern, it is neccessary to match the expanded pattern. If it does not match the expanded pattern, it will not match the original pattern.

clear

public void clear()

finalize

protected void finalize()

Overrides:

finalize in class java.lang.Object