ConpherenceParticipantCountQuery.php
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	<?php

	final class ConpherenceParticipantCountQuery
	extends PhabricatorOffsetPagedQuery {

	private $participantPHIDs;
	private $unread;

	public function withParticipantPHIDs(array $phids) {
	$this->participantPHIDs = $phids;
	return $this;
	}

	public function withUnread($unread) {
	$this->unread = $unread;
	return $this;
	}

	public function execute() {
	$thread = new ConpherenceThread();
	$table = new ConpherenceParticipant();
	$conn = $table->establishConnection('r');

	$rows = queryfx_all(
	$conn,
	'SELECT COUNT(*) as count, participantPHID
	FROM %T participant JOIN %T thread
	ON participant.conpherencePHID = thread.phid %Q %Q %Q',
	$table->getTableName(),
	$thread->getTableName(),
	$this->buildWhereClause($conn),
	$this->buildGroupByClause($conn),
	$this->buildLimitClause($conn));

	return ipull($rows, 'count', 'participantPHID');
	}

	protected function buildWhereClause(AphrontDatabaseConnection $conn) {
	$where = array();

	if ($this->participantPHIDs !== null) {
	$where[] = qsprintf(
	$conn,
	'participant.participantPHID IN (%Ls)',
	$this->participantPHIDs);
	}

	if ($this->unread !== null) {
	if ($this->unread) {
	$where[] = qsprintf(
	$conn,
	'participant.seenMessageCount < thread.messageCount');
	} else {
	$where[] = qsprintf(
	$conn,
	'participant.seenMessageCount >= thread.messageCount');
	}
	}

	return $this->formatWhereClause($where);
	}

	private function buildGroupByClause(AphrontDatabaseConnection $conn) {
	return qsprintf(
	$conn,
	'GROUP BY participantPHID');
	}

	}