<?php

namespace Laminas\Mail\Storage\Message;

interface MessageInterface
{
    /**
     * return toplines as found after headers
     *
     * @return string toplines
     */
    public function getTopLines();

    /**
     * check if flag is set
     *
     * @param mixed $flag a flag name, use constants defined in Laminas\Mail\Storage
     * @return bool true if set, otherwise false
     */
    public function hasFlag($flag);

    /**
     * get all set flags
     *
     * @return array array with flags, key and value are the same for easy lookup
     */
    public function getFlags();
}