<?php
/* $Id$ */
namespace Mammut\DB\Sql;

(defined('MAMMUT') && (basename(__FILE__) != basename($_SERVER['PHP_SELF']))) or die('ACCESS DENIED');

use Mammut\DB\Sql\Dialect\iDialect;
use Mammut\DB\Sql\Elements\Having;
use Mammut\DB\Sql\Elements\Table;
use Mammut\DB\Sql\Expression\iExprBool;
use Mammut\DB\Sql\Elements\Condition;

/**
 * Trait that adds the "WHERE" context to queries
 *
 * @author Stefan Daurer <s.daurer@q-spot.org>
 * @package Mammut\DB\Sql
 */
trait Selective {
	
	/**
	 *
	 * @var Condition
	 */
	protected $where = NULL;

	/**
	 * Defines a where clause
	 * 
	 * @return $this
	 */
	public function where($predicate, $combination = iExprBool::OP_AND) {
		if($predicate instanceof Condition)
			$this->where = $predicate;
		else {
			if(is_null($this->where))
				$this->where = new Condition();
			$this->where->addPredicates($predicate, $combination);
		}
		
		$this->setup[self::WHERE] = $this->where;
		return $this;
	}
}