felixarntz/wp-encrypt

<?php
/**
 * WPENC\Core\DomainKeyPair class
 *
 * @package WPENC
 * @subpackage Core
 * @author Felix Arntz <felix-arntz@leaves-and-love.net>
 * @since 1.0.0
 */

namespace WPENC\Core;

if ( ! defined( 'ABSPATH' ) ) {
    die();
}

if ( ! class_exists( 'WPENC\Core\DomainKeyPair' ) ) {
    /**
     * This class represents a single pair of public and private key for a domain.
     *
     * @since 1.0.0
     */
    final class DomainKeyPair extends KeyPair {
        /**
         * Singleton instances.
         *
         * @since 1.0.0
         * @access private
         * @static
         * @var array
         */
        private static $instances = array();

        /**
         * Singleton method.
         *
         * @since 1.0.0
         * @access public
         * @static
         *
         * @param string $domain The domain to get the instance for.
         * @return WPENC\Core\DomainKeyPair The class instance for the domain.
         */
        public static function get( $domain ) {
            if ( ! isset( self::$instances[ $domain ] ) ) {
                self::$instances[ $domain ] = new self( $domain );
            }
            return self::$instances[ $domain ];
        }

        /**
         * Constructor.
         *
         * @since 1.0.0
         * @access protected
         *
         * @param string $domain The domain of this key pair.
         */
        protected function __construct( $domain ) {
            parent::__construct( $domain );
        }
    }
}