Writing ASP Chat using JavaScript and XML (Part 4)

// Session class.
/**
 *  Manipulations with session, stored in xml.
 *  @param xmlNode XML node with single session information.
 */
function Session(xmlNode, markAccesssing) {
	this.xmlNode = xmlNode;
	this.markAccesssing = markAccesssing;
	this.userExpirationTime = getSessionExpirationTime(); // seconds
	this.getSessionID = Session_getSessionID;
	this.getUserNick = Session_getUserNick;
	this.setUserNick = Session_setUserNick;
	this.getClientIP = Session_getClientIP;
	this.setClientIP = Session_setClientIP;
	this.doesExpired = Session_doesExpired;
	this.markLastAccessTime = Session_markLastAccessTime;
	this.setAttribte = Session_setAttribte;
	this.getAttribte = Session_getAttribte;
}

/**
 *  Extracting session id of owned session.
 *  @return The session id.
 */
function Session_getSessionID() {
	var id = this.getAttribte("ID");
	this.markLastAccessTime();
	return id;
}

/**
 *  Extracting user nick.
 */
function Session_getUserNick() {
	var userNick = this.getAttribte("NAME");
	this.markLastAccessTime();
	return userNick;
}

/**
 *  Assigning new user nick.
 */
function Session_setUserNick(userNick) {
	this.setAttribte("NAME", userNick);
	this.markLastAccessTime();
}

/**
 *  Extracting client of this session IP address.
 */
function Session_getClientIP() {
	var clientIP = this.getAttribte("CLIENTIP");
	this.markLastAccessTime();
	return clientIP;
}

/**
 *  Assigning client IP address.
 */
function Session_setClientIP(clientIP) {
	this.setAttribte("CLIENTIP", clientIP);
	this.markLastAccessTime();
}

/**
 *  Check record for not accessed time-out.
 */
function Session_doesExpired() {
	var accessedValue = this.getAttribte("ACCESSED");
	if(accessedValue == null) {
		// Maybe the first time accessing.
		return false;
	}
	var current = new Date();
	var p = Number(accessedValue);
	var expirationDiff = p + this.userExpirationTime*1000;
	return (expirationDiff < current.valueOf());
}

/**
 *  Continue accessing this session.
 */
function Session_markLastAccessTime() {
	if(this.markAccesssing) {
		var currentTime = new Date();
		var lastAccessTime = currentTime.valueOf();
		this.setAttribte("ACCESSED", lastAccessTime);
	}
}

/**
 *  Create or rename name-value pair of attribute.
 *  @param name the attribute name.
 *  @param value attribute value.
 */
function Session_setAttribte(name, value) {
	var attributeNode = this.xmlNode.attributes.getNamedItem(name);
	if(attributeNode != null) {
		attributeNode.nodeValue = value;
	}
	else {
		var xmlDoc = this.xmlNode.ownerDocument;
		attributeNode = xmlDoc.createAttribute(name);
		attributeNode.nodeValue = value;
		this.xmlNode.attributes.setNamedItem(attributeNode);
	}
}

/**
 *  Retraiving specified attribute value.
 *  @param name the attribute name.
 *  @return Attribute value.
 */
function Session_getAttribte(name) {
	var xmlNode = this.xmlNode.attributes.getNamedItem(name);
	if(xmlNode != null) {
		return xmlNode.nodeValue;
	}
	else {
		return null;
	}
}
// Session class.