File.php
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	<?php

	namespace Sabre\DAV;

	/**
	* File class
	*
	* This is a helper class, that should aid in getting file classes setup.
	* Most of its methods are implemented, and throw permission denied exceptions
	*
	* @copyright Copyright (C) 2007-2015 fruux GmbH (https://fruux.com/).
	* @author Evert Pot (http://evertpot.com/)
	* @license http://sabre.io/license/ Modified BSD License
	*/
	abstract class File extends Node implements IFile {

	/**
	* Updates the data
	*
	* data is a readable stream resource.
	*
	* @param resource $data
	* @return void
	*/
	function put($data) {

	throw new Exception\Forbidden('Permission denied to change data');

	}

	/**
	* Returns the data
	*
	* This method may either return a string or a readable stream resource
	*
	* @return mixed
	*/
	function get() {

	throw new Exception\Forbidden('Permission denied to read this file');

	}

	/**
	* Returns the size of the file, in bytes.
	*
	* @return int
	*/
	function getSize() {

	return 0;

	}

	/**
	* Returns the ETag for a file
	*
	* An ETag is a unique identifier representing the current version of the file. If the file changes, the ETag MUST change.
	* The ETag is an arbitrary string, but MUST be surrounded by double-quotes.
	*
	* Return null if the ETag can not effectively be determined
	*
	* @return string\|null
	*/
	function getETag() {

	return null;

	}

	/**
	* Returns the mime-type for a file
	*
	* If null is returned, we'll assume application/octet-stream
	*
	* @return string\|null
	*/
	function getContentType() {

	return null;

	}

	}

File Metadata