/
UserTags.php
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/
UserTags.php
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<?php
/**
*
* License, TERMS and CONDITIONS
*
* This software is licensed under the GNU LESSER GENERAL PUBLIC LICENSE (LGPL) version 3
* Please read the license here : http://www.gnu.org/licenses/lgpl-3.0.txt
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* ATTRIBUTION REQUIRED
* 4. All web pages generated by the use of this software, or at least
* the page that lists the recent questions (usually home page) must include
* a link to the http://www.lampcms.com and text of the link must indicate that
* the website's Questions/Answers functionality is powered by lampcms.com
* An example of acceptable link would be "Powered by <a href="http://www.lampcms.com">LampCMS</a>"
* The location of the link is not important, it can be in the footer of the page
* but it must not be hidden by style attributes
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This product includes GeoLite data created by MaxMind,
* available from http://www.maxmind.com/
*
*
* @author Dmitri Snytkine <cms@lampcms.com>
* @copyright 2005-2012 (or current year) Dmitri Snytkine
* @license http://www.gnu.org/licenses/lgpl-3.0.txt GNU LESSER GENERAL PUBLIC LICENSE (LGPL) version 3
* @link http://www.lampcms.com Lampcms.com project
* @version Release: @package_version@
*
*
*/
namespace Lampcms;
/**
* Class responsible for adding/updating
* a per-user tags counter collection
*
* This collection will be used for displaying
* per - user tag stats on user profile page
* can also be used for data mining but for that
* a separate script has to run periodically like
* once a day and maintain $tag => users array
*
* @author Dmitri Snytkine
*
*/
class UserTags extends LampcmsObject
{
const USER_TAGS = 'USER_TAGS';
/**
* @todo pass only Mongo\DB
* and not Registry
*
* do not extend LampcmsObject
* set own $Mongo instance variable
* add own factory method
*
* @param Registry $Registry
*/
public function __construct(Registry $Registry)
{
$this->Registry = $Registry;
}
/**
* Add array of tags to per-user tags collection
*
* @param int $uid
* @param Question $Question
* @return \Lampcms\UserTags
*/
public function addTags($uid, \Lampcms\Question $Question)
{
/**
* Questions that come from external APIs may not
* have any user associated with it, uid is 0 or null then
* in this case we should not attempt to
* insert user tags, just return
*/
if (empty($uid)) {
return;
}
$uid = (int)$uid;
$aTags = $Question['a_tags'];
/**
* Extra precaution to filter out
* empty values
*/
$aTags = \array_filter($aTags);
$coll = $this->Registry->Mongo->getCollection(self::USER_TAGS);
$a = $coll->findOne(array('_id' => $uid));
/**
* If there is not record of tags for this user yet,
* then we will make array with $tag => 1
* and will use that,
*
* otherwise loop over existing array of tags,
* increasing count, then sorting in descending
* order by count and same to collection
*/
if (empty($a)) {
$aTemp = \array_count_values($aTags);
} else {
$aTemp = $a['tags'];
foreach ($aTags as $t) {
/**
* Under no circumstances should we allow
* an empty value to make its way into this array
* since this array is indexed and empty values
* in index may cause very bad times in Mongo.
*/
if (empty($t)) {
//e('Strange, there is an empty value of the tag in array: '.print_r($aTags, 1));
continue;
}
if (array_key_exists($t, $aTemp)) {
$aTemp[$t] += 1;
} else {
$aTemp[$t] = 1;
}
}
\arsort($aTemp, SORT_NUMERIC);
}
d('Saving (updating) User tags');
$coll->save(array('_id' => $uid, 'tags' => $aTemp, 'i_count' => count($aTemp)), array('fsync' => true));
d('Updated User Tags');
return $this;
}
/**
*
* When question is marked deleted OR is retaged
* we must update the user tags to account
* for all tags in the removed question
*
* @param Question $Question
* @param null $uid
*
* @return \Lampcms\UserTags
*/
public function removeTags(Question $Question, $uid = null)
{
/**
* If question is deleted
* then dont update anything
*
*/
$uid = ($uid) ? (int)$uid : $Question->getOwnerId();
$aTags = $Question['a_tags'];
/**
* Extra precaution to filter out
* empty values
*/
$aTags = \array_filter($aTags);
$coll = $this->Registry->Mongo->getCollection(self::USER_TAGS);
$a = $coll->findOne(array('_id' => $uid));
if (empty($a) || empty($a['tags'])) {
return $this;
}
$aUserTags = $a['tags'];
foreach ($aTags as $t) {
if (array_key_exists($t, $aUserTags)) {
$aUserTags[$t] -= 1;
if ($aUserTags[$t] < 1) {
$aUserTags[$t] = false;
}
}
}
/**
* Remove empty values
* in case a count of tags has reached 0
* in the process.
* Otherwise bad times will happen as an empty value
* will make its way into Mongo Index since this
* array is indexed. Mongo does not allow empty values
* in index and will throw exception or error
*
*/
$aUserTags = \array_filter($aUserTags);
\arsort($aUserTags, SORT_NUMERIC);
$coll->save(array('_id' => $uid, 'tags' => $aUserTags, 'i_count' => count($aUserTags)), array('fsync' => true));
return $this;
}
}