CakePHP: CartComponent

gistfile1.php

<?php
App::uses('Component', 'Controller');

class CartComponent extends Component {

    /**
     * @var array
     */
    public $components = array('Session');

    /**
     * @var array
     */
    public $settings = array('name' => 'Cart');

    /**
     * @param ComponentCollection $collection
     * @param array $settings
     */
    public function __construct(ComponentCollection $collection, $settings = array()) {
        $this->settings = Set::merge($this->settings, $settings); // @todo
    }

    /**
     * @param Controller $controller
     */
    public function initialize(Controller $controller) {
        $this->Controller = $controller;
    }

    /**
     * @param $id
     * @param int $quantity
     * @param null $property
     * @return bool
     */
    public function add($id, $quantity = 1, $property = null) {

        // @todo Check weather valid id

        if (!is_numeric($quantity)) {
            $quantity = 1;
        }

        $quantity = abs($quantity);

        if ($quantity == 0) {
            return $this->remove($id);
        }

        if ($this->Controller->Session->check($this->settings['name'] . '.' . $id)) {
            $quantity = $this->Controller->Session->read($this->settings['name'] . '.' . $id . '.quantity') + $quantity;
        }

        $this->Controller->Session->write($this->settings['name'] . '.' . $id . '.quantity', $quantity);

        if (isset($property)) {
            $this->Controller->Session->write($this->settings['name'] . '.' . $id . '.property', $property);
        }

        return true;
    }

    /**
     * @param $id
     * @param $quantity
     * @param null $property
     * @return bool
     */
    public function update($id, $quantity, $property = null) {

        // @todo Check weather valid id

        if (!$this->Controller->Session->check($this->settings['name'] . '.' . $id) || !is_numeric($quantity)) {
            return false;
        }

        $quantity = abs($quantity);

        if ($quantity == 0) {
            return $this->remove($id);
        }

        $this->Controller->Session->write($this->settings['name'] . '.' . $id . '.quantity', $quantity);

        if (isset($property)) {
            $this->Controller->Session->write($this->settings['name'] . '.' . $id . '.property', $property);
        }

        return true;
    }

    /**
     * @param $id
     * @return bool
     */
    public function remove($id) {
        if ($this->Controller->Session->check($this->settings['name'] . '.' . $id)) {
            $this->Controller->Session->delete($this->settings['name'] . '.' . $id);
            return true;
        }
        return false;
    }

    /**
     * @param $id
     * @return mixed
     */
    public function get($id) {
        return $this->Controller->Session->read($this->settings['name'] . '.' . $id);
    }

    /**
     * @return mixed
     */
    public function getAll() {
        return $this->Controller->Session->read($this->settings['name']);
    }

    /**
     *
     */
    public function clear() {
        $this->Controller->Session->delete($this->settings['name']);
    }

}