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/*
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License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
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$Id: FeatureCollection.js 3882 2008-02-27 15:41:33Z gjvoosten $
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*/
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// Ensure this object's dependancies are loaded.
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mapbuilder.loadScript(baseDir+"/model/ModelBase.js");
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/**
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* Stores a GML Feature or FeatureCollection as defined by the
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* Open Geospatial Consortium (http://www.opengeospatial.org/).
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*
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* @constructor
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* @base ModelBase
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* @author Cameron Shorter
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* @requires Sarissa
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* @param modelNode The model's XML object node from the configuration document.
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* @param parent The parent model for the object.
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*/
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function FeatureCollection(modelNode, parent) {
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// Inherit the ModelBase functions and parameters
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ModelBase.apply(this, new Array(modelNode, parent));
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this.featureTagName = this.getProperty("mb:featureTagName", "topp:CITY_NAME");
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this.coordsTagName = this.getProperty("mb:coordsTagName", "//gml:coordinates");
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this.nodeSelectXpath = this.getProperty("mb:nodeSelectXpath");
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this.coordSelectXpath = this.getProperty("mb:coordSelectXpath", "topp:the_geom/gml:MultiPoint/gml:pointMember/gml:Point/gml:coordinates");
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// Namespace to use when doing Xpath queries, usually set in config file.
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//if (!this.namespace){
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// this.namespace = "xmlns:gml='http://www.opengis.net/gml' xmlns:wfs='http://www.opengis.net/wfs'";
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//}
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/**
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* convert coordinates in the GML document to the SRS of the map container,
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* if required. The coordinate values are replaced in the GML document.
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* @param objRef Pointer to this object.
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*/
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this.convertCoords = function(objRef) {
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if( objRef.doc && objRef.containerModel && objRef.containerModel.doc ) {
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var coordNodes = objRef.doc.selectNodes( objRef.coordsTagName );
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if (coordNodes.length>0 && objRef.containerModel) {
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var srsNode = coordNodes[0].selectSingleNode("ancestor-or-self::*/@srsName");
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if( srsNode && (srsNode.nodeValue.toUpperCase() != objRef.containerModel.getSRS().toUpperCase()) ) {
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var sourceProj = new OpenLayers.Projection(srsNode.nodeValue);
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objRef.setParam("modelStatus",mbGetMessage("convertingCoords"));
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var containerProj = new OpenLayers.Projection(objRef.containerModel.getSRS());
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for (var i=0; i<coordNodes.length; ++i) {
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var coords = getNodeValue(coordNodes[i]);
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var coordsArray = coords.split(' ');
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var newCoords = '';
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for (var j=0; j<coordsArray.length; ++j) {
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var xy = coordsArray[j].split(',');
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if (xy.length==2) {
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var pt=new OpenLayers.Geometry.Point(xy[0],xy[1]);
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pt.transform(sourceProj,containerProj);
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newCoords += pt.x + ',' + pt.y + ' ';
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}
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}
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coordNodes[i].firstChild.nodeValue=newCoords;
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}
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}
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}
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}
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}
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/**
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* Called when the OWSContext gets loaded
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*/
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this.loadWfsRequests = function(objRef) {
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//alert( "FeatureCollection loadModel:"+(new XMLSerializer()).serializeToString(objRef.containerModel.doc))
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// we need to retrieve all the features
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if( objRef.containerModel.doc != null) {
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//alert( "FeatureCollection loadModel:"+(new XMLSerializer()).serializeToString(objRef.containerModel.doc))
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var featureTypes = objRef.containerModel.doc.selectNodes("/wmc:OWSContext/wmc:ResourceList/wmc:FeatureType");
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if( featureTypes.length > 0 ) {
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for( var i=0; i<featureTypes.length; i++) {
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var httpPayload = new Object();
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var wfsFeature = featureTypes[i]
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//alert( "feature:"+ (new XMLSerializer()).serializeToString(wfsFeature) )
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var server = wfsFeature.selectSingleNode("wmc:Server")
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//alert( "server:"+ (new XMLSerializer()).serializeToString(server) )
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var onlineResource = server.selectSingleNode("wmc:OnlineResource")
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//alert( "onlineResource:"+ (new XMLSerializer()).serializeToString(onlineResource) )
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httpPayload.method = onlineResource.getAttribute("method")
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httpPayload.url = onlineResource.getAttribute("xlink:href")
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//alert( "server:"+ httpPayload.method + " " + httpPayload.url )
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var query = wfsFeature.selectSingleNode("wfs:GetFeature")
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//alert( "query2:"+ (new XMLSerializer()).serializeToString( query ))
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httpPayload.postData = (new XMLSerializer()).serializeToString( query )
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// This does not work on IE for some reaso
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// wfsFeature.model = objRef;
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objRef.wfsFeature = wfsFeature
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objRef.newRequest(objRef,httpPayload);
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//objRef.containerModel.setParam('addLayer', wfsFeature);
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//var sld = wfsFeature.selectSingleNode("wmc:StyleList")
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}
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}
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}
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}
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this.addFirstListener("loadModel",this.convertCoords,this);
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if( this.containerModel ) this.containerModel.addListener("loadModel",this.loadWfsRequests,this);
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/**
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* Change a feature's visibility.
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* @param featureName The name of the feature to set the hidden value for
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* @param hidden, 1=hidden, 0=not hidden.
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*/
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this.setHidden=function(featureName, hidden){
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this.hidden = hidden;
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this.callListeners("hidden", featureName);
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}
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/**
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* Geta feature's visibility.
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* @param featureName The name of the feature to set the hidden value for
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* @return hidden value, true=hidden, false=not hidden.
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*/
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this.getHidden=function(layerName){
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return this.hidden;
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}
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this.hidden = false;
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/**
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* Returns the list of nodes selected by the nodeSelectpath. These nodes
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* will be the individual feature members from the collection.
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* @return list of nodes selected
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*/
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this.getFeatureNodes = function() {
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return this.doc.selectNodes(this.nodeSelectXpath);
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}
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/**
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* Returns a label for a node in the feature list
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* @param featureNode the feature node to selectfrom
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* @return a label for this feature
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*/
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this.getFeatureName = function(featureNode) {
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var labelNode = featureNode.selectSingleNode(this.featureTagName); //TBD: set this dynamically
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return labelNode?getNodeValue(labelNode):mbGetMessage("noRssTitle");
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}
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/**
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* Returns an ID value for a node in the feature list
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* @param featureNode the feature node to selectfrom
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* @return ID for this feature
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*/
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this.getFeatureId = function(featureNode) {
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return featureNode.getAttribute("fid")?featureNode.getAttribute("fid"):"no_id";
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}
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/**
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* Returns a point geometry for the feature
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* @param featureNode the feature node to select from
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* @return the geometric point for the node
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*/
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this.getFeaturePoint = function(featureNode) {
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var coords = featureNode.selectSingleNode(this.coordSelectXpath);
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if (coords) {
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var point = getNodeValue(coords).split(',');
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return point
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} else {
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return new Array(0,0); //or some other error to return?
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}
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}
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/**
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* Returns a GML geometry for the feature
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* @param featureNode the feature node to select from
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* @return the GML for the node
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*/
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this.getFeatureGeometry = function(featureNode) {
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var geometryTag = featureNode.selectSingleNode(this.coordsTagName);
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if( geometryTag != null )
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return geometryTag.firstChild;
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else {
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alert(mbGetMessage("invalidGeom", (new XMLSerializer()).serializeToString(featureNode)));
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}
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}
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}
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