Summary

Contains XPathParser class.

This is part of Troika.ASP Framework - web development MVC framework for ASP 3.0. Please visit www.troika-asp.com for more details.

/**
* @fileoverview Contains <tt>XPathParser</tt> class.
*
* <p>
* This is part of Troika.ASP Framework - web development MVC framework for ASP 3.0.
* Please visit {@link http://www.troika-asp.com www.troika-asp.com} for more details.
* </p>
*
* @author Pavel Chuchev pav@troika-asp.com
* @version $Revision: 1.3 $
*/
/**
* Constructs a new instance of XPathParser class.
*
* @class This is <tt>XPathParser</tt> class for extracting XML nodesets by xpath.
*
* @constructor
* @param {String} xmlFile The XML file to load from.
* @param {String} xml The XML to use, optional. If not specified the XML will be loaded using xmlFile parameter.
*/
function XPathParser(xmlFile, xml) {

    if (arguments.length) {

        this.init(xmlFile, xml);
    }
}
/**
* Initializes <tt>XPathParser</tt>.
*
* @return <tt>XPathParser</tt> object instance itself.
* @param {String} xmlFile The XML file to load from.
* @param {String} xml The XML to use, optional. If not specified the XML will be loaded using xmlFile parameter.
* @type XPathParser
*/
XPathParser.prototype.init = function (xmlFile, xml) {

    this.parser =  new ActiveXObject("MSXML2.DOMDocument");
    this.parser.async = false;
    this.parser.resolveExternals = true;
    this.parser.setProperty("SelectionLanguage", "XPath");

    if (xml) {

        this.parser.loadXML(xml);
    }
    else {

        this.parser.load(xmlFile);
    }

    var errCode = this.parser.parseError.errorCode;
    if (errCode) {

        throw new Error(errCode);
    }

    return this;
};
/**
* Selects a list of nodes matching the XPath expression.
*
* @param {String} query The XPath expression.
* @return The list of nodes matching the XPath expression.
*/
XPathParser.prototype.apply = function (query) {

    return this.parser.selectNodes(query);
};