/*
 * This class provides generic read and write access to the mobile device file system.
 */
function File() {
	/**
	 * The data of a file.
	 */
	this.data = "";
	/**
	 * The name of the file.
	 */
	this.name = "";
};

/*
 * Reads a file from the mobile device. This function is asyncronous.
 * @param {String} fileName The name (including the path) to the file on the mobile device. 
 * The file name will likely be device dependant.
 * @param {Function} successCallback The function to call when the file is successfully read.
 * @param {Function} errorCallback The function to call when there is an error reading the file from the device.
 */
File.prototype.read = function(fileName, successCallback, errorCallback) {
	//Mojo has no file i/o yet, so we use an xhr. very limited
	var path = fileName;	//incomplete
	//Mojo.Log.error(path);
	navigator.debug.error(path);
	
	if (typeof successCallback != 'function')
		successCallback = function () {};
	if (typeof errorCallback != 'function')
		errorCallback = function () {};
	
	var xhr = new XMLHttpRequest();
	xhr.onreadystatechange = function() {
		if (xhr.readyState == 4) {
			if (xhr.status == 200 && xhr.responseText != null) {
				this.data = xhr.responseText;
				this.name = path;
				successCallback(this.data);
			} else {
				errorCallback({ name: xhr.status, message: "could not read file: " + path });
			}
		}
	};
	xhr.open("GET", path, true);
	xhr.send();
};

/*
 * Writes a file to the mobile device. 
 * @param {File} file The file to write to the device.
 */
File.prototype.write = function(file) {
	//Palm does not provide file i/o
};

if (typeof navigator.file == "undefined") navigator.file = new File();