KARMA.php

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<?php
/*
 * Nucleus: PHP/MySQL Weblog CMS (http://nucleuscms.org/)
 * Copyright (C) 2002-2007 The Nucleus Group
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * (see nucleus/documentation/index.html#license for more info)
 */
class KARMA {

        // id of item about which this object contains information
        var $itemid;

        // indicates if the karma vote info has already been intialized from the DB
        var $inforead;

        // amount of positive/negative votes
        var $karmapos;
        var $karmaneg;

        function KARMA($itemid, $initpos = 0, $initneg = 0, $initread = 0) {
                // itemid
                $this->itemid = intval($itemid);

                // have we read the karma info yet?
                $this->inforead = intval($initread);

                // number of positive and negative votes
                $this->karmapos = intval($initpos);
                $this->karmaneg = intval($initneg);
        }

        function getNbPosVotes() {
                if (!$this->inforead) $this->readFromDatabase();
                return $this->karmapos;
        }
        function getNbNegVotes() {
                if (!$this->inforead) $this->readFromDatabase();
                return $this->karmaneg;
        }
        function getNbOfVotes() {
                if (!$this->inforead) $this->readFromDatabase();
                return ($this->karmapos + $this->karmaneg);
        }
        function getTotalScore() {
                if (!$this->inforead) $this->readFromDatabase();
                return ($this->karmapos - $this->karmaneg);
        }

        function setNbPosVotes($val) {
                $this->karmapos = intval($val);
        }
        function setNbNegVotes($val) {
                $this->karmaneg = intval($val);
        }


        // adds a positive vote
        function votePositive() {
                $newKarma = $this->getNbPosVotes() + 1;
                $this->setNbPosVotes($newKarma);
                $this->writeToDatabase();
                $this->saveIP();
        }

        // adds a negative vote
        function voteNegative() {
                $newKarma = $this->getNbNegVotes() + 1;
                $this->setNbNegVotes($newKarma);
                $this->writeToDatabase();
                $this->saveIP();
        }



        // these methods shouldn't be called directly
        function readFromDatabase() {
                $query = 'SELECT ikarmapos, ikarmaneg FROM '.sql_table('item').' WHERE inumber=' . $this->itemid;
                $res = sql_query($query);
                $obj = mysql_fetch_object($res);

                $this->karmapos = $obj->ikarmapos;
                $this->karmaneg = $obj->ikarmaneg;
                $this->inforead = 1;
        }


        function writeToDatabase() {
                $query = 'UPDATE '.sql_table('item').' SET ikarmapos=' . $this->karmapos . ', ikarmaneg='.$this->karmaneg.' WHERE inumber=' . $this->itemid;
                sql_query($query);
        }

        // checks if a vote is still allowed for an IP
        function isVoteAllowed($ip) {
                $query = 'SELECT * FROM '.sql_table('karma')." WHERE itemid=$this->itemid and ip='".addslashes($ip)."'";
                $res = sql_query($query);
                return (mysql_num_rows($res) == 0);
        }

        // save IP in database so no multiple votes are possible
        function saveIP() {
                $query = 'INSERT INTO '.sql_table('karma').' (itemid, ip) VALUES ('.$this->itemid.",'".addslashes(serverVar('REMOTE_ADDR'))."')";
                sql_query($query);
        }
}

?>

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