<?php
/**
 * Коллекция
 *
 * package core
 */
class Collection implements ArrayAccess
{
    /**
     * Holds collective request data
     *
     * @var array
     */
    protected $data = array();

    /**
     * Преобразование массива в коллекцию
     *
     * @param array $data
     */
    public function import(array $data)
    {
        $this->data = array_merge($this->data, $data);
        return true;
    }

    /**
     * Преобразование коллекции в массив
     */
    public function export()
    {
        return $this->data;
    }

    /**
     * Store "request data" in GPC order.
     *
     * @param string $key
     * @param mixed  $value
     *
     * @return void
     */
    public function set($key, $value)
    {
        $this->data[$key] = $value;
    }

    /**
     * Read stored "request data" by referencing a key.
     *
     * @param string $key
     *
     * @return mixed
     */
    public function get($key, $default = null)
    {
        return isset($this->data[$key]) ? $this->data[$key] : $default;
    }

    public function getInt($key, $default = 0) 
    {
        return intval($this->get($key, $default));
    }

    public function getString($key, $default = '')
    {
        return ((string) $this->get($key, $default));
    }

    public function getNat($key, $default = 1)
    {
        $result = intval($this->get($key, $default));
        return (($result > 0) ? $result : $default); 
    }

    public function clear()
    {
        $this->data = array();
    }

    public function offsetSet($key, $value)
    {
        $this->data[$key] = $value;
    }

    public function offsetExists($key)
    {
        return isset($this->data[$key]);
    }

    public function offsetUnset($key)
    {
        unset($this->data[$key]);
    }

    public function offsetGet($key)
    {
        return isset($this->data[$key]) ? $this->data[$key] : null;
    }
}