silverstripe-framework/ORM/DataQuery_SubGroup.php

<?php

namespace SilverStripe\ORM;

use SilverStripe\ORM\Queries\SQLConditionGroup;
use SilverStripe\ORM\Queries\SQLSelect;

/**
 * Represents a subgroup inside a WHERE clause in a {@link DataQuery}
 *
 * Stores the clauses for the subgroup inside a specific {@link SQLSelect} object.
 * All non-where methods call their DataQuery versions, which uses the base
 * query object.
 */
class DataQuery_SubGroup extends DataQuery implements SQLConditionGroup
{

	/**
	 *
	 * @var SQLSelect
	 */
	protected $whereQuery;

	public function __construct(DataQuery $base, $connective)
	{
		parent::__construct($base->dataClass);
		$this->query = $base->query;
		$this->whereQuery = new SQLSelect();
		$this->whereQuery->setConnective($connective);

		$base->where($this);
	}

	public function where($filter)
	{
		if ($filter) {
			$this->whereQuery->addWhere($filter);
		}

		return $this;
	}

	public function whereAny($filter)
	{
		if ($filter) {
			$this->whereQuery->addWhereAny($filter);
		}

		return $this;
	}

	public function conditionSQL(&$parameters)
	{
		$parameters = array();

		// Ignore empty conditions
		$where = $this->whereQuery->getWhere();
		if (empty($where)) {
			return null;
		}

		// Allow database to manage joining of conditions
		$sql = DB::get_conn()->getQueryBuilder()->buildWhereFragment($this->whereQuery, $parameters);
		return preg_replace('/^\s*WHERE\s*/i', '', $sql);
	}
}