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/*
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License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
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$Id$
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*/
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/**
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* Base Model class to be inherited by all Model objects and provdes methods
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* and properties common to all models.
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* Stores the XML document as the .doc property of the model.
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* Inherits from the Listener class so all models are also listener objects that
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* can call registered listeners.
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* @constructor
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* @base Listener
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* @author Cameron Shorter
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* @param modelNode The model's XML object node from the configuration document.
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* @param parentModel The model object that this model belongs to.
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*/
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function ModelBase(modelNode, parentModel) {
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// Inherit the Listener functions and parameters
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Listener.apply(this);
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//models are loaded asynchronously by default;
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this.async = true; //change to false for sync loading
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this.contentType = "text/xml";
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this.modelNode = modelNode;
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var idAttr = modelNode.attributes.getNamedItem("id");
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if (idAttr) {
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this.id = idAttr.nodeValue;
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} else {
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//auto generated unique ID assigned to this model
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this.id = "MbModel_" + mbIds.getId();
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}
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//get the human readable title for the model
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var titleNode = modelNode.selectSingleNode("mb:title");
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if (titleNode) {
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this.title = titleNode.firstChild.nodeValue;
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} else {
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this.title = this.id;
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}
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// set an empty debug property which turns of alert messages for a
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// particular model
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if(modelNode.selectSingleNode("mb:debug"))this.debug="true";
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/**
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* set the initial model URL in config.
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* the URL can also be passed in as a URL parameter by using the model ID
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* as the parameter name (which takes precendence over the config file)
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**/
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if (window.cgiArgs[this.id]) {
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this.url = window.cgiArgs[this.id];
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} else if (window[this.id]) {
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this.url = window[this.id];
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} else if (modelNode.url) {
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this.url = modelNode.url;
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} else {
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var defaultModel = modelNode.selectSingleNode("mb:defaultModelUrl");
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if (defaultModel) this.url = defaultModel.firstChild.nodeValue;
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}
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//set the method property
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var method = modelNode.selectSingleNode("mb:method");
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if (method) {
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this.method = method.firstChild.nodeValue;
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} else {
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this.method = "get";
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}
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//set the namespace property
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var namespace = modelNode.selectSingleNode("mb:namespace");
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if (namespace) {
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this.namespace = namespace.firstChild.nodeValue;
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}
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var templateAttr = modelNode.attributes.getNamedItem("template");
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if (templateAttr) {
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this.template = (templateAttr.nodeValue=="true")?true:false;
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this.modelNode.removeAttribute("template");
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}
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//get the xpath to select nodes from the parent doc
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var nodeSelectXpath = modelNode.selectSingleNode("mb:nodeSelectXpath");
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if (nodeSelectXpath) {
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this.nodeSelectXpath = nodeSelectXpath.firstChild.nodeValue;
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}
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/**
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* Get the value of a node as selected by an XPath expression.1
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* @param objRef Reference to this node.
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* @param xpath XPath of the node to update.
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* @return value of the node or null if XPath does not find a node.
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*/
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this.getXpathValue=function(objRef,xpath){
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if (!objRef.doc) return null;
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node=objRef.doc.selectSingleNode(xpath);
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if(node && node.firstChild){
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return node.firstChild.nodeValue;
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}else{
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return null;
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}
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}
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/**
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* Update the value of a node within this model's XML document.
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* Triggers a refresh event from the model.
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* @param objRef Reference to this node.
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* @param xpath Xpath of the node to update.
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* @param value Node's new value.
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* @param refresh determines if the model should be refreshed (optional).
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* @return Returns false if Xpath does not find a node.
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*/
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this.setXpathValue=function(objRef,xpath,value,refresh){
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if (refresh==null) refresh=true;
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var node=objRef.doc.selectSingleNode(xpath);
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if(node){
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if(node.firstChild){
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node.firstChild.nodeValue=value;
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}else{
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dom=Sarissa.getDomDocument();
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v=dom.createTextNode(value);
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node.appendChild(v);
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}
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if (refresh) objRef.setParam("refresh");
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return true;
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}else{
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return false;
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}
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}
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/**
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* Load a Model's document.
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* This will only occur if the model.url property is set.
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* Calling this method triggers several events:
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* modelStatus - to indicate that the model state is changing
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* newModel - to give widgets a chance to clear themselves before the doc is loaded
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* loadModel - to indicate that the document is loaded successfully
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*
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* @param objRef Pointer to the model object being loaded.
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*/
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this.loadModelDoc = function(objRef){
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//alert("loading:"+objRef.url);
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if (objRef.url) {
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objRef.callListeners( "newModel" );
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objRef.setParam("modelStatus","loading");
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if (objRef.contentType == "image") {
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//image models are set as a DOM image object
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objRef.doc = new Image();
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objRef.doc.src = objRef.url;
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//objRef.doc.onload = callback //TBD: for when image is loaded
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} else {
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//XML content type
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var xmlHttp = new XMLHttpRequest();
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var sUri = objRef.url;
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if ( sUri.indexOf("http://")==0 ) {
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if (objRef.method == "get") {
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sUri = getProxyPlusUrl(sUri);
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} else {
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sUri = config.proxyUrl;
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}
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}
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xmlHttp.open(objRef.method, sUri, objRef.async);
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if (objRef.method == "post") {
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xmlHttp.setRequestHeader("content-type",objRef.contentType);
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xmlHttp.setRequestHeader("serverUrl",objRef.url);
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}
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xmlHttp.onreadystatechange = function() {
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objRef.setParam("modelStatus",httpStatusMsg[xmlHttp.readyState]);
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if (xmlHttp.readyState==4) {
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if (xmlHttp.status >= 400) { //http errors status start at 400
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var errorMsg = "error loading document: " + sUri + " - " + xmlHttp.statusText + "-" + xmlHttp.responseText;
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alert(errorMsg);
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objRef.setParam("modelStatus",errorMsg);
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return;
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} else {
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//alert(xmlHttp.getResponseHeader("Content-Type"));
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if ( null==xmlHttp.responseXML ) {
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alert( "null XML response:" + xmlHttp.responseText );
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} else {
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objRef.doc = xmlHttp.responseXML;
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//if (objRef.doc.documentElement.nodeName.search(/exception/i)>=0) {
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// objRef.setParam("modelStatus",-1);
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// alert("Exception:"+Sarissa.serialize(xmlHttp.responseText));
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//}
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}
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objRef.finishLoading();
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}
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}
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}
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xmlHttp.send(objRef.postData);
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if (!objRef.async) {
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if (xmlHttp.status >= 400) { //http errors status start at 400
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var errorMsg = "error loading document: " + sUri + " - " + xmlHttp.statusText + "-" + xmlHttp.responseText;
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alert(errorMsg);
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this.objRef.setParam("modelStatus",errorMsg);
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return;
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} else {
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//alert(xmlHttp.getResponseHeader("Content-Type"));
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if ( null==xmlHttp.responseXML ) alert( "null XML response:" + xmlHttp.responseText );
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objRef.doc = xmlHttp.responseXML;
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objRef.finishLoading();
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}
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}
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//objRef.doc.validateOnParse=false; //IE6 SP2 parsing bug
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}
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}
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}
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/**
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* Set the model's XML document using an XML object as a parameter.
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* @param objRef Pointer to this object.
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* @param newModel XML object to be inserted into the new model.
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*/
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this.setModel=function(objRef,newModel){
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objRef.callListeners("newModel");
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objRef.doc=newModel;
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if ((newModel == null) && objRef.url) {
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objRef.url = null;
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}
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objRef.finishLoading();
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}
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/**
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* Common steps to be carried out after all manner of model loading
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* Called to set the namespace for XPath selections and call the loadModel
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* listeners.
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*/
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this.finishLoading = function() {
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// the following two lines are needed for IE; set the namespace for selection
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if(this.doc){
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this.doc.setProperty("SelectionLanguage", "XPath");
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if(this.namespace) Sarissa.setXpathNamespaces(this.doc, this.namespace);
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// Show the newly loaded XML document
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if(this.debug) alert("Loading Model:"+this.id+" "+Sarissa.serialize(this.doc));
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this.callListeners("contextLoaded"); //PGC
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this.callListeners("loadModel");
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}
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}
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/**
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* Load XML for a model from an httpPayload object. This will also handle
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* instantiating template models if they have the "template" attribute set.
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* To update model data, use:<br/>
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* httpPayload=new Object();<br/>
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* httpPayload.url="url" or null. If set to null, all dependant widgets
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* will be removed from the display.<br/>
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* httpPayload.httpMethod="post" or "get"<br/>
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* httpPayload.postData=XML or null<br/>
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* @param objRef Pointer to the model object being loaded.
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* @param httpPayload an object to fully specify the request to be made
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*/
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this.newRequest = function(objRef, httpPayload){
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var model = objRef;
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// if the targetModel is a template model, then create new model object and
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// assign it an id
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if (objRef.template) {
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var parentNode = objRef.modelNode.parentNode;
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var newConfigNode;
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if(_SARISSA_IS_IE) {
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newConfigNode = parentNode.appendChild(modelNode.cloneNode(true));
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} else {
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newConfigNode = parentNode.appendChild(objRef.modelNode.ownerDocument.importNode(objRef.modelNode,true));
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}
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newConfigNode.removeAttribute("id"); //this will get created automatically
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//set defaultModelUrl config properties
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model = objRef.createObject(newConfigNode);
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model.callListeners("init");
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if (!objRef.templates) objRef.templates = new Array();
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objRef.templates.push(model);
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}
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//set the payload in the model and issue the request
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model.url = httpPayload.url;
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if (!model.url) model.doc=null;
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model.method = httpPayload.method;
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model.postData = httpPayload.postData;
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model.loadModelDoc(model);
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}
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/**
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* deletes all template models and clears their widgets
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*/
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this.deleteTemplates = function() {
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if (this.templates) {
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while( model=this.templates.pop() ) {
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model.setParam("newModel");
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var parentNode = this.modelNode.parentNode;
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parentNode.removeChild(model.modelNode);
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}
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}
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}
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/**
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* save the model by posting it to the serializeUrl, which is defined as a
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* property of config.
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* @param objRef Pointer to this object.
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*/
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this.saveModel = function(objRef) {
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if (config.serializeUrl) {
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var response = postLoad(config.serializeUrl, objRef.doc);
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response.setProperty("SelectionLanguage", "XPath");
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Sarissa.setXpathNamespaces(response, "xmlns:xlink='http://www.w3.org/1999/xlink'");
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var onlineResource = response.selectSingleNode("//OnlineResource");
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var fileUrl = onlineResource.attributes.getNamedItem("xlink:href").nodeValue;
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objRef.setParam("modelSaved", fileUrl);
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} else {
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alert("serializeUrl must be specified in config to save a model");
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}
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}
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320
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/**
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* Creates all mapbuilder JavaScript objects based on the Object nodes defined
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* in the configuration file.
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* A reference to the created model is stored as a property of the config.objects
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325
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* property using the model's ID; you can always get a reference to a mapbuilder
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* object as: "config.objects.objectId"
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* @param configNode The node from config for the model to be created
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*/
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this.createObject = function(configNode) {
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var objectType = configNode.nodeName;
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var evalStr = "new " + objectType + "(configNode,this);";
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var newObject = eval( evalStr );
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if ( newObject ) {
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config.objects[newObject.id] = newObject;
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return newObject;
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} else {
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alert("error creating object:" + objectType);
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}
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}
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/**
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* Creates all the mapbuilder objects from the config file as selected by the
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* XPath value passed in.
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* @param objectXpath The XPath for the set of nodes being created
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*/
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this.loadObjects = function(objectXpath) {
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//loop through all nodes selected from config
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var configObjects = this.modelNode.selectNodes( objectXpath );
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for (var i=0; i<configObjects.length; i++ ) {
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this.createObject( configObjects[i]);
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}
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}
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353
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354
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/**
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* Initialization of all javascript model, widget and tool objects for this model.
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356
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* Calling this method triggers an init event for this model.
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357
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* @param objRef Pointer to this object.
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358
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*/
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359
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this.parseConfig = function(objRef) {
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360
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objRef.loadObjects("mb:widgets/*");
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361
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objRef.loadObjects("mb:tools/*");
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362
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objRef.loadObjects("mb:models/*");
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363
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}
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364
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365
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/**
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* Listener registered with the parent model to call refresh listeners when
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367
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* the model document is loaded
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368
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* @param objRef Pointer to this object.
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369
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*/
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370
|
this.refresh = function(objRef) {
|
|
371
|
objRef.setParam("refresh",true);
|
|
372
|
}
|
|
373
|
this.addListener("loadModel",this.refresh, this);
|
|
374
|
|
|
375
|
/**
|
|
376
|
* Listener registered with the parent model to call init listeners when
|
|
377
|
* the parent model is init'ed
|
|
378
|
* @param objRef Pointer to this object.
|
|
379
|
*/
|
|
380
|
this.init = function(objRef) {
|
|
381
|
objRef.callListeners("init");
|
|
382
|
}
|
|
383
|
|
|
384
|
/**
|
|
385
|
* Listener registered with the parent model to remove the doc and url
|
|
386
|
* of child models whenever the parent is reloaded.
|
|
387
|
* @param objRef Pointer to this object.
|
|
388
|
*/
|
|
389
|
this.clearModel = function(objRef) {
|
|
390
|
objRef.doc=null;
|
|
391
|
//objRef.url=null;
|
|
392
|
}
|
|
393
|
|
|
394
|
//don't load in models and widgets if this is the config doc,
|
|
395
|
//defer that to an explcit config.init() call in mapbuilder.js
|
|
396
|
if (parentModel) {
|
|
397
|
this.parentModel = parentModel;
|
|
398
|
this.parentModel.addListener("init",this.init, this);
|
|
399
|
this.parentModel.addListener("loadModel",this.loadModelDoc, this);
|
|
400
|
this.parentModel.addListener("newModel", this.clearModel, this);
|
|
401
|
this.parseConfig(this);
|
|
402
|
}
|
|
403
|
}
|
|
404
|
|
|
405
|
//ModelBase.prototype.httpStatusMsg = ['uninitialized','loading','loaded','interactive','completed'];
|
|
406
|
var httpStatusMsg = ['uninitialized','loading','loaded','interactive','completed'];
|