IdentifierExpression.php

<?php
/**
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @since         3.0.0
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */
namespace Cake\Database\Expression;

use Cake\Database\ExpressionInterface;
use Cake\Database\ValueBinder;

/**
 * Represents a single identifier name in the database
 *
 * @internal
 */
class IdentifierExpression implements ExpressionInterface {

/**
 * Holds the identifier string
 *
 * @var string
 */
	protected $_identifier;

/**
 * Constructor
 *
 * @param string $identifier The identifier this expression represents
 */
	public function __construct($identifier) {
		$this->setIdentifier($identifier);
	}

/**
 * Sets the identifier this expression represents
 *
 * @param string $identifier
 * @return void
 */
	public function setIdentifier($identifier) {
		$this->_identifier = $identifier;
	}

/**
 * Returns the identifier this expression represents
 *
 * @return string
 */
	public function getIdentifier() {
		return $this->_identifier;
	}

/**
 * Converts the expression to its string representation
 *
 * @param \Cake\Database\ValueBinder $generator Placeholder generator object
 * @return string
 */
	public function sql(ValueBinder $generator) {
		return $this->_identifier;
	}

/**
 * This method is a no-op, this is a leaf type of expression,
 * hence there is nothing to traverse
 *
 * @param callable $callable
 * @return void
 */
	public function traverse(callable $callable) {
	}

}