Siena C++ API documentation (v. 0.4.3b5)

Filter Class Reference

#include <Siena.h>

List of all members.

Public Member Functions

 Filter ()
 Filter (const Filter &)
Filter & operator= (const string &)
bool operator== (const Filter &) const
iterator add_constraint (const string &, SXOperator, const AttributeValue &)
iterator add_constraint (const string &, const AttributeConstraint &)
Filter & reduce ()

Detailed Description

expression filtering notifications

A Filter represents a boolean expression to be evaluated against an Notification. It consists of a set of constraints. Each constraint poses a condition on an attribute of the Notification. A Filter can pose multiple constraints on the same attribute.

A Filter is implemented by means of a multimap<string, AttributeConstraint>, therefore a Filter can be manipulated using all the methods of a standard multimap. Two additional utility methods are provided to add constraints.

See also:
AttributeConstraint
Examples:

subscriber.cc.

Constructor & Destructor Documentation

Filter::Filter (   ) 
 

default constructor

creates an empty filter (always false)

Filter::Filter (  const Filter &   ) 
 

copy constructor

Member Function Documentation

iterator Filter::add_constraint (  const string &  ,
const AttributeConstraint & 
) 
 

adds a constraint to this filter

iterator Filter::add_constraint (  const string &  ,
SXOperator  ,
const AttributeValue & 
) 
 

adds a constraint to this filter

Examples:
subscriber.cc.

Filter& Filter::operator= (  const string &   ) 
 

fills in the constraints of this notification from a string representation of a filter

     Filter f;

     f = "{ dest = \"MXP\" price < 850 }";

bool Filter::operator== (  const Filter &   )  const
 

equality operator

The documentation for this class was generated from the following file:
Copyright © 2001 University of Colorado.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License". This documentation is authored and maintained by Antonio Carzaniga