<?php
/**
 * escpos-php, a Thermal receipt printer library, for use with
 * ESC/POS compatible printers.
 *
 * Copyright (c) 2014-2015 Michael Billington <michael.billington@gmail.com>,
 * 	incorporating modifications by:
 *  - Roni Saha <roni.cse@gmail.com>
 *  - Gergely Radics <gerifield@ustream.tv>
 *  - Warren Doyle <w.doyle@fuelled.co>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 * Interface passed to Escpos class for receiving print data. Print connectors
 * are responsible for transporting this to the actual printer.
 */
interface PrintConnector {
	/**
	 * Print connectors should cause a NOTICE if they are deconstructed
	 * when they have not been finalized.
	 */
	public function __destruct();

	/**
	 * Finish using this print connector (close file, socket, send
	 * accumulated output, etc).
	 */
	public function finalize();

	/**
	 * @param string $data
	 * @return Data read from the printer, or false where reading is not possible.
	 */
	public function read($len);
	
	/**
	 * @param string $data
	 */
	public function write($data);
}