<?php
/* $Id$ */
namespace Mammut\DB\Sql\Expression;

(defined('MAMMUT') && (basename(__FILE__) != basename($_SERVER['PHP_SELF']))) or die('ACCESS DENIED');

use Mammut\DB\Sql\Dialect\iDialect;

/**
 * Adds support for a target field/literal to the class
 *
 * @author Stefan Daurer <s.daurer@q-spot.org>
 * @package Mammut\DB\Sql
 */
trait WithTarget {

	protected $target;

	/**
	 * Set the target of the expression
	 *
	 * @param string|array $identifier        	
	 * @return In
	 */
	public function setTarget($target) {
		if (is_string($target) || is_array($target))
			$target = new Literal($target, iExprValue::TYPE_IDENTIFIER);
		if (!($target instanceof iExprValue))
			throw new \InvalidArgumentException('string or iExprValue required');
		$this->target = $target;
		
		return $this;
	}

	/**
	 * Get the target of the expression
	 *
	 * @return Literal
	 */
	public function getTarget() {
		return $this->target;
	}
	
}