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<?php

/*
 * This file is part of the Predis package.
 *
 * (c) Daniele Alessandri <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Predis\Response;

/**
 * Represents a status response returned by Redis.
 *
 * @author Daniele Alessandri <[email protected]>
 */
class Status implements ResponseInterface
{
    private static $OK;
    private static $QUEUED;

    private $payload;

    /**
     * @param string $payload Payload of the status response as returned by Redis.
     */
    public function __construct($payload)
    {
        $this->payload = $payload;
    }

    /**
     * Converts the response object to its string representation.
     *
     * @return string
     */
    public function __toString()
    {
        return $this->payload;
    }

    /**
     * Returns the payload of status response.
     *
     * @return string
     */
    public function getPayload()
    {
        return $this->payload;
    }

    /**
     * Returns an instance of a status response object.
     *
     * Common status responses such as OK or QUEUED are cached in order to lower
     * the global memory usage especially when using pipelines.
     *
     * @param string $payload Status response payload.
     *
     * @return string
     */
    public static function get($payload)
    {
        switch ($payload) {
            case 'OK':
            case 'QUEUED':
                if (isset(self::$$payload)) {
                    return self::$$payload;
                }

                return self::$$payload = new self($payload);

            default:
                return new self($payload);
        }
    }
}