<?php

namespace Symfony\Component\HttpFoundation;

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * ParameterBag is a container for key/value pairs.
 *
 * @author Fabien Potencier <fabien.potencier@symfony-project.com>
 */
class ParameterBag
{
    protected $parameters;

    /**
     * Constructor.
     *
     * @param array $parameters An array of parameters
     */
    public function __construct(array $parameters = array())
    {
        $this->replace($parameters);
    }

    /**
     * Returns the parameters.
     *
     * @return array An array of parameters
     */
    public function all()
    {
        return $this->parameters;
    }

    /**
     * Returns the parameter keys.
     *
     * @return array An array of parameter keys
     */
    public function keys()
    {
        return array_keys($this->parameters);
    }

    /**
     * Replaces the current parameters by a new set.
     *
     * @param array $parameters An array of parameters
     */
    public function replace(array $parameters = array())
    {
        $this->parameters = $parameters;
    }

    /**
     * Adds parameters.
     *
     * @param array $parameters An array of parameters
     */
    public function add(array $parameters = array())
    {
        $this->parameters = array_replace($this->parameters, $parameters);
    }

    /**
     * Returns a parameter by name.
     *
     * @param string $key     The key
     * @param mixed  $default The default value
     */
    public function get($key, $default = null)
    {
        return array_key_exists($key, $this->parameters) ? $this->parameters[$key] : $default;
    }

    /**
     * Sets a parameter by name.
     *
     * @param string $key   The key
     * @param mixed  $value The value
     */
    public function set($key, $value)
    {
        $this->parameters[$key] = $value;
    }

    /**
     * Returns true if the parameter is defined.
     *
     * @param string $key The key
     *
     * @return Boolean true if the parameter exists, false otherwise
     */
    public function has($key)
    {
        return array_key_exists($key, $this->parameters);
    }

    /**
     * Deletes a parameter.
     *
     * @param string $key The key
     */
    public function delete($key)
    {
        unset($this->parameters[$key]);
    }

    /**
     * Returns the alphabetic characters of the parameter value.
     *
     * @param string $key     The parameter key
     * @param mixed  $default The default value
     *
     * @return string The filtered value
     */
    public function getAlpha($key, $default = '')
    {
        return preg_replace('/[^[:alpha:]]/', '', $this->get($key, $default));
    }

    /**
     * Returns the alphabetic characters and digits of the parameter value.
     *
     * @param string $key     The parameter key
     * @param mixed  $default The default value
     *
     * @return string The filtered value
     */
    public function getAlnum($key, $default = '')
    {
        return preg_replace('/[^[:alnum:]]/', '', $this->get($key, $default));
    }

    /**
     * Returns the digits of the parameter value.
     *
     * @param string $key     The parameter key
     * @param mixed  $default The default value
     *
     * @return string The filtered value
     */
    public function getDigits($key, $default = '')
    {
        return preg_replace('/[^[:digit:]]/', '', $this->get($key, $default));
    }

    /**
     * Returns the parameter value converted to integer.
     *
     * @param string $key     The parameter key
     * @param mixed  $default The default value
     *
     * @return string The filtered value
     */
    public function getInt($key, $default = 0)
    {
        return (int) $this->get($key, $default);
    }
}