<?php

namespace Sabre\DAV;

/**
 * SimpleFile
 *
 * The 'SimpleFile' class is used to easily add read-only immutable files to
 * the directory structure. One usecase would be to add a 'readme.txt' to a
 * root of a webserver with some standard content.
 *
 * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
 * @author Evert Pot (http://www.rooftopsolutions.nl/)
 * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
 */
class SimpleFile extends File {

    /**
     * File contents
     *
     * @var string
     */
    protected $contents = array();

    /**
     * Name of this resource
     *
     * @var string
     */
    protected $name;

    /**
     * A mimetype, such as 'text/plain' or 'text/html'
     *
     * @var string
     */
    protected $mimeType;

    /**
     * Creates this node
     *
     * The name of the node must be passed, as well as the contents of the
     * file.
     *
     * @param string $name
     * @param string $contents
     * @param string|null $mimeType
     */
    public function __construct($name, $contents, $mimeType = null) {

        $this->name = $name;
        $this->contents = $contents;
        $this->mimeType = $mimeType;

    }

    /**
     * Returns the node name for this file.
     *
     * This name is used to construct the url.
     *
     * @return string
     */
    public function getName() {

        return $this->name;

    }

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

        return $this->contents;

    }

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

        return strlen($this->contents);

    }

    /**
     * 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
     */
    public function getETag() {

        return '"' . md5($this->contents) . '"';

    }

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

        return $this->mimeType;

    }

}
