/**
 * 
 * @param {Object} xmlText
 * @returns {XmlDataSourceTool}
 */
var XmlDataSourceTool = function (xmlText) {
    this.xmlDoc = null;
    this.oneColumn = "";

    /**
    * 
    * @param {String} xmlText
    * @returns {void}
    */
    this.init = function (xmlText) {
        if (xmlText === undefined) {
            return null;
        }
        if (xmlText === null) {
            return;
        }

        var xmlTextType = this.toType(xmlText);

        if (xmlTextType === "xmldocument" || xmlTextType === "document") {
            this.xmlDoc = xmlText;
        } else {
            var parser = null;
            if (window.DOMParser) {
                parser = new DOMParser();
                this.xmlDoc = parser.parseFromString(xmlText, "text/xml");
            }
            else // Internet Explorer
            {
                this.xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
                this.xmlDoc.async = false;
                this.xmlDoc.loadXML(xmlText);
            }
        }

        try {
            var x = this.xmlDoc.documentElement;
            var firstNode = this.getFirstChild(x);

            for (var i = 0; i < firstNode.childNodes.length; i++) {
                if (firstNode.childNodes[i].nodeType === 1) {
                    this.oneColumn = firstNode.childNodes[i].nodeName;
                    break;
                }
            }
        } catch (err) {
            this.oneColumn = "";
        }
    };

    this.importDataWindow = function (dwobj) {
        
    };

    this.setXmlDoc = function (xmlDoc) {
        this.xmlDoc = xmlDoc;
        var x = this.xmlDoc.documentElement;
        var firstNode = this.getFirstChild(x);

        for (var i = 0; i < firstNode.childNodes.length; i++) {
            if (firstNode.childNodes[i].nodeType === 1) {
                this.oneColumn = firstNode.childNodes[i].nodeName;
                break;
            }
        }
    };

    /**
    * 
    * @param {Element} n
    * @returns {Element}
    */
    this.getFirstChild = function (n) {
        var x = n.firstChild;
        while (x.nodeType !== 1) {
            x = x.nextSibling;
        }
        return x;
    };

    /**
    * 
    * @param {Number} row
    * @param {String} column
    * @returns {String}
    */
    this.GetItemString = function (row, column) {
        var result = "";
        try {
            result = (this.xmlDoc.getElementsByTagName(column)[row].childNodes[0].nodeValue) + "";
            if (result === null || result === undefined) {
                result = "";
            }
        } catch (err) {
            result = "";
        }
        return result;
    };

    /**
    * 
    * @param {type} row
    * @param {type} column
    * @returns {String}
    */
    this.GetItemStringTrim = function (row, column) {
        var result = this.GetItemString(row, column).replace(/^\s+|\s+$/g, '');
        return result;
    };

    /**
    * 
    * @param {Number} row
    * @param {String} column
    * @returns {Number}
    */
    this.GetItemNumber = function (row, column) {
        var text = this.GetItemString(row, column);
        var result = 0;
        try {
            if (text.indexOf(".") > 0) {
                result = parseFloat(text);
            } else {
                result = parseInt(text);
            }
        } catch (err) {
            result = 0;
        }
        return result;
    };

    /**
    * 
    * @returns {Number}
    */
    this.RowCount = function () {
        //xhr.responseXML.getElementsByTagName( "pet" ).length 
        if (this.oneColumn == "") {
            return -1;
        }
        return this.xmlDoc.getElementsByTagName(this.oneColumn).length;
    };

    /**
    * 
    * @returns {String}
    */
    this.toString = function () {
        var xmlString = "";
        //IE
        if (window.ActiveXObject) {
            xmlString = this.xmlDoc.xml + "";
        }
        // code for Mozilla, Firefox, Opera, etc.
        else {
            xmlString = (new XMLSerializer()).serializeToString(this.xmlDoc) + "";
        }
        return xmlString;
    };

    /**
    * 
    * @param {type} obj
    * @returns {String}
    */
    this.toType = function (obj) {
        return ({}).toString.call(obj).match(/\s([a-zA-Z]+)/)[1].toLowerCase();
    };

    this.init(xmlText);
};