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ConpherenceParticipantQuery.php
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Sat, Apr 5, 07:08

ConpherenceParticipantQuery.php
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<?php
/**
* Query class that answers these questions:
*
* - Q: What are the conpherences to show when I land on /conpherence/ ?
* - A:
*
* id(new ConpherenceParticipantQuery())
* ->withParticipantPHIDs(array($my_phid))
* ->execute();
*
* - Q: What are the next set of conpherences as I scroll up (more recent) or
* down (less recent) this list of conpherences?
* - A:
*
* id(new ConpherenceParticipantQuery())
* ->withParticipantPHIDs(array($my_phid))
* ->withParticipantCursor($top_participant)
* ->setOrder(ConpherenceParticipantQuery::ORDER_NEWER)
* ->execute();
*
* -or-
*
* id(new ConpherenceParticipantQuery())
* ->withParticipantPHIDs(array($my_phid))
* ->withParticipantCursor($bottom_participant)
* ->setOrder(ConpherenceParticipantQuery::ORDER_OLDER)
* ->execute();
*
* For counts of read, un-read, or all conpherences by participant, see
* @{class:ConpherenceParticipantCountQuery}.
*
* @group conpherence
*/
final class ConpherenceParticipantQuery
extends PhabricatorOffsetPagedQuery {
const LIMIT = 100;
const ORDER_NEWER = 'newer';
const ORDER_OLDER = 'older';
private $participantPHIDs;
private $participantCursor;
private $order = self::ORDER_OLDER;
public function withParticipantPHIDs(array $phids) {
$this->participantPHIDs = $phids;
return $this;
}
public function withParticipantCursor(ConpherenceParticipant $participant) {
$this->participantCursor = $participant;
return $this;
}
public function setOrder($order) {
$this->order = $order;
return $this;
}
public function execute() {
$table = new ConpherenceParticipant();
$conn_r = $table->establishConnection('r');
$data = queryfx_all(
$conn_r,
'SELECT * FROM %T participant %Q %Q %Q',
$table->getTableName(),
$this->buildWhereClause($conn_r),
$this->buildOrderClause($conn_r),
$this->buildLimitClause($conn_r));
$participants = $table->loadAllFromArray($data);
$participants = mpull($participants, null, 'getConpherencePHID');
if ($this->order == self::ORDER_NEWER) {
$participants = array_reverse($participants);
}
return $participants;
}
private function buildWhereClause($conn_r) {
$where = array();
if ($this->participantPHIDs) {
$where[] = qsprintf(
$conn_r,
'participantPHID IN (%Ls)',
$this->participantPHIDs);
}
if ($this->participantCursor) {
$date_touched = $this->participantCursor->getDateTouched();
$id = $this->participantCursor->getID();
if ($this->order == self::ORDER_OLDER) {
$compare_date = '<';
$compare_id = '<=';
} else {
$compare_date = '>';
$compare_id = '>=';
}
$where[] = qsprintf(
$conn_r,
'(dateTouched %Q %d OR (dateTouched = %d AND id %Q %d))',
$compare_date,
$date_touched,
$date_touched,
$compare_id,
$id);
}
return $this->formatWhereClause($where);
}
private function buildOrderClause(AphrontDatabaseConnection $conn_r) {
$order_word = ($this->order == self::ORDER_OLDER) ? 'DESC' : 'ASC';
// if these are different direction we won't get as efficient a query
// see http://dev.mysql.com/doc/refman/5.5/en/order-by-optimization.html
$order = qsprintf(
$conn_r,
'ORDER BY dateTouched %Q, id %Q',
$order_word,
$order_word);
return $order;
}
}

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