gnu-social/classes/Profile_list.php

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2011-03-06 17:58:03 +00:00
<?php
/**
* StatusNet - the distributed open-source microblogging tool
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Notices
* @package StatusNet
* @author Shashi Gowda <connect2shashi@gmail.com>
* @license GNU Affero General Public License http://www.gnu.org/licenses/
*/
if (!defined('GNUSOCIAL')) { exit(1); }
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class Profile_list extends Managed_DataObject
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{
public $__table = 'profile_list'; // table name
public $id; // int(4) primary_key not_null
public $tagger; // int(4)
public $tag; // varchar(64)
public $description; // text
public $private; // tinyint(1)
public $created; // datetime not_null default_0000-00-00%2000%3A00%3A00
public $modified; // timestamp not_null default_CURRENT_TIMESTAMP
public $uri; // varchar(191) unique_key not 255 because utf8mb4 takes more space
public $mainpage; // varchar(191) not 255 because utf8mb4 takes more space
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public $tagged_count; // smallint
public $subscriber_count; // smallint
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public static function schemaDef()
{
return array(
'fields' => array(
'id' => array('type' => 'serial', 'not null' => true, 'description' => 'unique identifier'),
'tagger' => array('type' => 'int', 'not null' => true, 'description' => 'user making the tag'),
'tag' => array('type' => 'varchar', 'length' => 64, 'not null' => true, 'description' => 'people tag'),
'description' => array('type' => 'text', 'description' => 'description of the people tag'),
'private' => array('type' => 'int', 'size' => 'tiny', 'default' => 0, 'description' => 'is this tag private'),
'created' => array('type' => 'timestamp', 'not null' => true, 'description' => 'date the tag was added'),
'modified' => array('type' => 'timestamp', 'not null' => true, 'default' => 'CURRENT_TIMESTAMP', 'description' => 'date the tag was modified'),
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'uri' => array('type' => 'varchar', 'length' => 191, 'description' => 'universal identifier'),
'mainpage' => array('type' => 'varchar', 'length' => 191, 'description' => 'page to link to'),
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'tagged_count' => array('type' => 'int', 'default' => 0, 'description' => 'number of people tagged with this tag by this user'),
'subscriber_count' => array('type' => 'int', 'default' => 0, 'description' => 'number of subscribers to this tag'),
),
'primary key' => array('tagger', 'tag'),
'unique keys' => array(
'profile_list_id_key' => array('id')
),
'foreign keys' => array(
'profile_list_tagger_fkey' => array('profile', array('tagger' => 'id')),
),
'indexes' => array(
'profile_list_modified_idx' => array('modified'),
'profile_list_tag_idx' => array('tag'),
'profile_list_tagger_tag_idx' => array('tagger', 'tag'),
'profile_list_tagged_count_idx' => array('tagged_count'),
'profile_list_subscriber_count_idx' => array('subscriber_count'),
),
);
}
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/**
* get the tagger of this profile_list object
*
* @return Profile the tagger
*/
function getTagger()
{
return Profile::getByID($this->tagger);
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}
/**
* return a string to identify this
* profile_list in the user interface etc.
*
* @return String
*/
function getBestName()
{
return $this->tag;
}
/**
* return a uri string for this profile_list
*
* @return String uri
*/
function getUri()
{
$uri = null;
if (Event::handle('StartProfiletagGetUri', array($this, &$uri))) {
if (!empty($this->uri)) {
$uri = $this->uri;
} else {
$uri = common_local_url('profiletagbyid',
array('id' => $this->id, 'tagger_id' => $this->tagger));
}
}
Event::handle('EndProfiletagGetUri', array($this, &$uri));
return $uri;
}
/**
* return a url to the homepage of this item
*
* @return String home url
*/
function homeUrl()
{
$url = null;
if (Event::handle('StartUserPeopletagHomeUrl', array($this, &$url))) {
// normally stored in mainpage, but older ones may be null
if (!empty($this->mainpage)) {
$url = $this->mainpage;
} else {
$url = common_local_url('showprofiletag',
array('nickname' => $this->getTagger()->nickname,
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'tag' => $this->tag));
}
}
Event::handle('EndUserPeopletagHomeUrl', array($this, &$url));
return $url;
}
/**
* return an immutable url for this object
*
* @return String permalink
*/
function permalink()
{
$url = null;
if (Event::handle('StartProfiletagPermalink', array($this, &$url))) {
$url = common_local_url('profiletagbyid',
array('id' => $this->id));
}
Event::handle('EndProfiletagPermalink', array($this, &$url));
return $url;
}
/**
* Query notices by users associated with this tag,
* but first check the cache before hitting the DB.
*
* @param integer $offset offset
* @param integer $limit maximum no of results
* @param integer $since_id=null since this id
* @param integer $max_id=null maximum id in result
*
* @return Notice the query
*/
function getNotices($offset, $limit, $since_id=null, $max_id=null)
{
// FIXME: Use something else than Profile::current() to avoid
// possible confusion between session user and queue processing.
$stream = new PeopletagNoticeStream($this, Profile::current());
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return $stream->getNotices($offset, $limit, $since_id, $max_id);
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}
/**
* Get subscribers (local and remote) to this people tag
* Order by reverse chronology
*
* @param integer $offset offset
* @param integer $limit maximum no of results
* @param integer $since_id=null since unix timestamp
* @param integer $upto=null maximum unix timestamp when subscription was made
*
* @return Profile results
*/
function getSubscribers($offset=0, $limit=null, $since=0, $upto=0)
{
$subs = new Profile();
$subs->joinAdd(
array('id', 'profile_tag_subscription:profile_id')
);
$subs->whereAdd('profile_tag_subscription.profile_tag_id = ' . $this->id);
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$subs->selectAdd('unix_timestamp(profile_tag_subscription.' .
'created) as "cursor"');
if ($since != 0) {
$subs->whereAdd('cursor > ' . $since);
}
if ($upto != 0) {
$subs->whereAdd('cursor <= ' . $upto);
}
if ($limit != null) {
$subs->limit($offset, $limit);
}
$subs->orderBy('profile_tag_subscription.created DESC');
$subs->find();
return $subs;
}
/**
* Get all and only local subscribers to this people tag
* used for distributing notices to user inboxes.
*
* @return array ids of users
*/
function getUserSubscribers()
{
// XXX: cache this
$user = new User();
if(common_config('db','quote_identifiers'))
$user_table = '"user"';
else $user_table = 'user';
$qry =
'SELECT id ' .
'FROM '. $user_table .' JOIN profile_tag_subscription '.
'ON '. $user_table .'.id = profile_tag_subscription.profile_id ' .
'WHERE profile_tag_subscription.profile_tag_id = %d ';
$user->query(sprintf($qry, $this->id));
$ids = array();
while ($user->fetch()) {
$ids[] = $user->id;
}
$user->free();
return $ids;
}
/**
* Check to see if a given profile has
* subscribed to this people tag's timeline
*
* @param mixed $id User or Profile object or integer id
*
* @return boolean subscription status
*/
function hasSubscriber($id)
{
if (!is_numeric($id)) {
$id = $id->id;
}
$sub = Profile_tag_subscription::pkeyGet(array('profile_tag_id' => $this->id,
'profile_id' => $id));
return !empty($sub);
}
/**
* Get profiles tagged with this people tag,
* include modified timestamp as a "cursor" field
* order by descending order of modified time
*
* @param integer $offset offset
* @param integer $limit maximum no of results
* @param integer $since_id=null since unix timestamp
* @param integer $upto=null maximum unix timestamp when subscription was made
*
* @return Profile results
*/
function getTagged($offset=0, $limit=null, $since=0, $upto=0)
{
$tagged = new Profile();
$tagged->joinAdd(array('id', 'profile_tag:tagged'));
#@fixme: postgres
$tagged->selectAdd('unix_timestamp(profile_tag.modified) as "cursor"');
$tagged->whereAdd('profile_tag.tagger = '.$this->tagger);
$tagged->whereAdd("profile_tag.tag = '{$this->tag}'");
if ($since != 0) {
$tagged->whereAdd('cursor > ' . $since);
}
if ($upto != 0) {
$tagged->whereAdd('cursor <= ' . $upto);
}
if ($limit != null) {
$tagged->limit($offset, $limit);
}
$tagged->orderBy('profile_tag.modified DESC');
$tagged->find();
return $tagged;
}
/**
* Gracefully delete one or many people tags
* along with their members and subscriptions data
*
* @return boolean success
*/
function delete($useWhere=false)
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{
// force delete one item at a time.
if (empty($this->id)) {
$this->find();
while ($this->fetch()) {
$this->delete();
}
}
Profile_tag::cleanup($this);
Profile_tag_subscription::cleanup($this);
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self::blow('profile:lists:%d', $this->tagger);
return parent::delete($useWhere);
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}
/**
* Update a people tag gracefully
* also change "tag" fields in profile_tag table
*
* @param Profile_list $dataObject Object's original form
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*
* @return boolean success
*/
function update($dataObject=false)
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{
if (!is_object($dataObject) && !$dataObject instanceof Profile_list) {
return parent::update($dataObject);
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}
$result = true;
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// if original tag was different
// check to see if the new tag already exists
// if not, rename the tag correctly
if($dataObject->tag != $this->tag || $dataObject->tagger != $this->tagger) {
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$existing = Profile_list::getByTaggerAndTag($this->tagger, $this->tag);
if(!empty($existing)) {
// TRANS: Server exception.
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throw new ServerException(_('The tag you are trying to rename ' .
'to already exists.'));
}
// move the tag
// XXX: allow OStatus plugin to send out profile tag
$result = Profile_tag::moveTag($dataObject, $this);
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}
return parent::update($dataObject);
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}
/**
* return an xml string representing this people tag
* as the author of an atom feed
*
* @return string atom author element
*/
function asAtomAuthor()
{
$xs = new XMLStringer(true);
$tagger = $this->getTagger();
$xs->elementStart('author');
$xs->element('name', null, '@' . $tagger->nickname . '/' . $this->tag);
$xs->element('uri', null, $this->permalink());
$xs->elementEnd('author');
return $xs->getString();
}
/**
* return an xml string to represent this people tag
* as a noun in an activitystreams feed.
*
* @param string $element the xml tag
*
* @return string activitystreams noun
*/
function asActivityNoun($element)
{
$noun = ActivityObject::fromPeopletag($this);
return $noun->asString('activity:' . $element);
}
/**
* get the cached number of profiles tagged with this
* people tag, re-count if the argument is true.
*
* @param boolean $recount whether to ignore cache
*
* @return integer count
*/
function taggedCount($recount=false)
{
$keypart = sprintf('profile_list:tagged_count:%d:%s',
$this->tagger,
$this->tag);
$count = self::cacheGet($keypart);
if ($count === false) {
$tags = new Profile_tag();
$tags->tag = $this->tag;
$tags->tagger = $this->tagger;
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$count = $tags->count('distinct tagged');
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self::cacheSet($keypart, $count);
}
return $count;
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}
/**
* get the cached number of profiles subscribed to this
* people tag, re-count if the argument is true.
*
* @param boolean $recount whether to ignore cache
*
* @return integer count
*/
function subscriberCount($recount=false)
{
$keypart = sprintf('profile_list:subscriber_count:%d',
$this->id);
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$count = self::cacheGet($keypart);
if ($count === false) {
$sub = new Profile_tag_subscription();
$sub->profile_tag_id = $this->id;
$count = (int) $sub->count('distinct profile_id');
self::cacheSet($keypart, $count);
}
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return $count;
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}
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/**
* get the cached number of profiles subscribed to this
* people tag, re-count if the argument is true.
*
* @param boolean $recount whether to ignore cache
*
* @return integer count
*/
function blowNoticeStreamCache($all=false)
{
self::blow('profile_list:notice_ids:%d', $this->id);
if ($all) {
self::blow('profile_list:notice_ids:%d;last', $this->id);
}
}
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/**
* get the Profile_list object by the
* given tagger and with given tag
*
* @param integer $tagger the id of the creator profile
* @param integer $tag the tag
*
* @return integer count
*/
static function getByTaggerAndTag($tagger, $tag)
{
$ptag = Profile_list::pkeyGet(array('tagger' => $tagger, 'tag' => $tag));
return $ptag;
}
/**
* create a profile_list record for a tag, tagger pair
* if it doesn't exist, return it.
*
* @param integer $tagger the tagger
* @param string $tag the tag
* @param string $description description
* @param boolean $private protected or not
*
* @return Profile_list the people tag object
*/
static function ensureTag($tagger, $tag, $description=null, $private=false)
{
$ptag = Profile_list::getByTaggerAndTag($tagger, $tag);
if(empty($ptag->id)) {
$args = array(
'tag' => $tag,
'tagger' => $tagger,
'description' => $description,
'private' => $private
);
$new_tag = Profile_list::saveNew($args);
return $new_tag;
}
return $ptag;
}
/**
* get the maximum number of characters
* that can be used in the description of
* a people tag.
*
* determined by $config['peopletag']['desclimit']
* if not set, falls back to $config['site']['textlimit']
*
* @return integer maximum number of characters
*/
static function maxDescription()
{
$desclimit = common_config('peopletag', 'desclimit');
// null => use global limit (distinct from 0!)
if (is_null($desclimit)) {
$desclimit = common_config('site', 'textlimit');
}
return $desclimit;
}
/**
* check if the length of given text exceeds
* character limit.
*
* @param string $desc the description
*
* @return boolean is the descripition too long?
*/
static function descriptionTooLong($desc)
{
$desclimit = self::maxDescription();
return ($desclimit > 0 && !empty($desc) && (mb_strlen($desc) > $desclimit));
}
/**
* save a new people tag, this should be always used
* since it makes uri, homeurl, created and modified
* timestamps and performs checks.
*
* @param array $fields an array with fields and their values
*
* @return mixed Profile_list on success, false on fail
*/
static function saveNew(array $fields) {
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extract($fields);
$ptag = new Profile_list();
$ptag->query('BEGIN');
if (empty($tagger)) {
// TRANS: Server exception saving new tag without having a tagger specified.
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throw new Exception(_('No tagger specified.'));
}
if (empty($tag)) {
// TRANS: Server exception saving new tag without having a tag specified.
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throw new Exception(_('No tag specified.'));
}
if (empty($mainpage)) {
$mainpage = null;
}
if (empty($uri)) {
// fill in later...
$uri = null;
}
if (empty($mainpage)) {
$mainpage = null;
}
if (empty($description)) {
$description = null;
}
if (empty($private)) {
$private = false;
}
$ptag->tagger = $tagger;
$ptag->tag = $tag;
$ptag->description = $description;
$ptag->private = $private;
$ptag->uri = $uri;
$ptag->mainpage = $mainpage;
$ptag->created = common_sql_now();
$ptag->modified = common_sql_now();
$result = $ptag->insert();
if (!$result) {
common_log_db_error($ptag, 'INSERT', __FILE__);
// TRANS: Server exception saving new tag.
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throw new ServerException(_('Could not create profile tag.'));
}
if (!isset($uri) || empty($uri)) {
$orig = clone($ptag);
$ptag->uri = common_local_url('profiletagbyid', array('id' => $ptag->id, 'tagger_id' => $ptag->tagger));
$result = $ptag->update($orig);
if (!$result) {
common_log_db_error($ptag, 'UPDATE', __FILE__);
// TRANS: Server exception saving new tag.
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throw new ServerException(_('Could not set profile tag URI.'));
}
}
if (!isset($mainpage) || empty($mainpage)) {
$orig = clone($ptag);
$user = User::getKV('id', $ptag->tagger);
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if(!empty($user)) {
$ptag->mainpage = common_local_url('showprofiletag', array('tag' => $ptag->tag, 'nickname' => $user->getNickname()));
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} else {
$ptag->mainpage = $uri; // assume this is a remote peopletag and the uri works
}
$result = $ptag->update($orig);
if (!$result) {
common_log_db_error($ptag, 'UPDATE', __FILE__);
// TRANS: Server exception saving new tag.
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throw new ServerException(_('Could not set profile tag mainpage.'));
}
}
return $ptag;
}
/**
* get all items at given cursor position for api
*
* @param callback $fn a function that takes the following arguments in order:
* $offset, $limit, $since_id, $max_id
* and returns a Profile_list object after making the DB query
* @param array $args arguments required for $fn
* @param integer $cursor the cursor
* @param integer $count max. number of results
*
* Algorithm:
* - if cursor is 0, return empty list
* - if cursor is -1, get first 21 items, next_cursor = 20th prev_cursor = 0
* - if cursor is +ve get 22 consecutive items before starting at cursor
* - return items[1..20] if items[0] == cursor else return items[0..21]
* - prev_cursor = items[1]
* - next_cursor = id of the last item being returned
*
* - if cursor is -ve get 22 consecutive items after cursor starting at cursor
* - return items[1..20]
*
* @returns array (array (mixed items), int next_cursor, int previous_cursor)
*/
// XXX: This should be in Memcached_DataObject... eventually.
static function getAtCursor($fn, array $args, $cursor, $count=20)
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{
$items = array();
$since_id = 0;
$max_id = 0;
$next_cursor = 0;
$prev_cursor = 0;
if($cursor > 0) {
// if cursor is +ve fetch $count+2 items before cursor starting at cursor
$max_id = $cursor;
$fn_args = array_merge($args, array(0, $count+2, 0, $max_id));
$list = call_user_func_array($fn, $fn_args);
while($list->fetch()) {
$items[] = clone($list);
}
if ((isset($items[0]->cursor) && $items[0]->cursor == $cursor) ||
$items[0]->id == $cursor) {
array_shift($items);
$prev_cursor = isset($items[0]->cursor) ?
-$items[0]->cursor : -$items[0]->id;
} else {
if (count($items) > $count+1) {
array_shift($items);
}
// this means the cursor item has been deleted, check to see if there are more
$fn_args = array_merge($args, array(0, 1, $cursor));
$more = call_user_func($fn, $fn_args);
if (!$more->fetch() || empty($more)) {
// no more items.
$prev_cursor = 0;
} else {
$prev_cursor = isset($items[0]->cursor) ?
-$items[0]->cursor : -$items[0]->id;
}
}
if (count($items)==$count+1) {
// this means there is a next page.
$next = array_pop($items);
$next_cursor = isset($next->cursor) ?
$items[$count-1]->cursor : $items[$count-1]->id;
}
} else if($cursor < -1) {
// if cursor is -ve fetch $count+2 items created after -$cursor-1
$cursor = abs($cursor);
$since_id = $cursor-1;
$fn_args = array_merge($args, array(0, $count+2, $since_id));
$list = call_user_func_array($fn, $fn_args);
while($list->fetch()) {
$items[] = clone($list);
}
$end = count($items)-1;
if ((isset($items[$end]->cursor) && $items[$end]->cursor == $cursor) ||
$items[$end]->id == $cursor) {
array_pop($items);
$next_cursor = isset($items[$end-1]->cursor) ?
$items[$end-1]->cursor : $items[$end-1]->id;
} else {
$next_cursor = isset($items[$end]->cursor) ?
$items[$end]->cursor : $items[$end]->id;
if ($end > $count) array_pop($items); // excess item.
// check if there are more items for next page
$fn_args = array_merge($args, array(0, 1, 0, $cursor));
$more = call_user_func_array($fn, $fn_args);
if (!$more->fetch() || empty($more)) {
$next_cursor = 0;
}
}
if (count($items) == $count+1) {
// this means there is a previous page.
$prev = array_shift($items);
$prev_cursor = isset($prev->cursor) ?
-$items[0]->cursor : -$items[0]->id;
}
} else if($cursor == -1) {
$fn_args = array_merge($args, array(0, $count+1));
$list = call_user_func_array($fn, $fn_args);
while($list->fetch()) {
$items[] = clone($list);
}
if (count($items)==$count+1) {
$next = array_pop($items);
if(isset($next->cursor)) {
$next_cursor = $items[$count-1]->cursor;
} else {
$next_cursor = $items[$count-1]->id;
}
}
}
return array($items, $next_cursor, $prev_cursor);
}
/**
* save a collection of people tags into the cache
*
* @param string $ckey cache key
* @param Profile_list &$tag the results to store
* @param integer $offset offset for slicing results
* @param integer $limit maximum number of results
*
* @return boolean success
*/
static function setCache($ckey, &$tag, $offset=0, $limit=null) {
$cache = Cache::instance();
if (empty($cache)) {
return false;
}
$str = '';
$tags = array();
while ($tag->fetch()) {
$str .= $tag->tagger . ':' . $tag->tag . ';';
$tags[] = clone($tag);
}
$str = substr($str, 0, -1);
if ($offset>=0 && !is_null($limit)) {
$tags = array_slice($tags, $offset, $limit);
}
$tag = new ArrayWrapper($tags);
return self::cacheSet($ckey, $str);
}
/**
* get people tags from the cache
*
* @param string $ckey cache key
* @param integer $offset offset for slicing
* @param integer $limit limit
*
* @return Profile_list results
*/
static function getCached($ckey, $offset=0, $limit=null) {
$keys_str = self::cacheGet($ckey);
if ($keys_str === false) {
return false;
}
$pairs = explode(';', $keys_str);
$keys = array();
foreach ($pairs as $pair) {
$keys[] = explode(':', $pair);
}
if ($offset>=0 && !is_null($limit)) {
$keys = array_slice($keys, $offset, $limit);
}
return self::getByKeys($keys);
}
/**
* get Profile_list objects from the database
* given their (tag, tagger) key pairs.
*
* @param array $keys array of array(tagger, tag)
*
* @return Profile_list results
*/
static function getByKeys(array $keys) {
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$cache = Cache::instance();
if (!empty($cache)) {
$tags = array();
foreach ($keys as $key) {
$t = Profile_list::getByTaggerAndTag($key[0], $key[1]);
if (!empty($t)) {
$tags[] = $t;
}
}
return new ArrayWrapper($tags);
} else {
$tag = new Profile_list();
if (empty($keys)) {
//if no IDs requested, just return the tag object
return $tag;
}
$pairs = array();
foreach ($keys as $key) {
$pairs[] = '(' . $key[0] . ', "' . $key[1] . '")';
}
$tag->whereAdd('(tagger, tag) in (' . implode(', ', $pairs) . ')');
$tag->find();
$temp = array();
while ($tag->fetch()) {
$temp[$tag->tagger.'-'.$tag->tag] = clone($tag);
}
$wrapped = array();
foreach ($keys as $key) {
$id = $key[0].'-'.$key[1];
if (array_key_exists($id, $temp)) {
$wrapped[] = $temp[$id];
}
}
return new ArrayWrapper($wrapped);
}
}
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function insert()
{
$result = parent::insert();
if ($result) {
self::blow('profile:lists:%d', $this->tagger);
}
return $result;
}
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}