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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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* Stores a GML Feature or FeatureCollection as defined by the
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* Open GIS Conortium http://opengis.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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// 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("//gml:coordinates");
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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.nodeValue.toUpperCase() != objRef.containerModel.getSRS().toUpperCase() ) {
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var sourceProj = new Proj(srsNode.nodeValue);
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objRef.setParam("modelStatus","converting coordinates");
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var containerProj = new Proj(objRef.containerModel.getSRS());
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for (var i=0; i<coordNodes.length; ++i) {
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var coords = coordNodes[i].firstChild.nodeValue;
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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 llTemp = sourceProj.Inverse(xy);
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xy = containerProj.Forward(llTemp);
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newCoords += xy.join(',') + ' ';
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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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this.addFirstListener("loadModel",this.convertCoords,this);
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if( this.containerModel ) this.containerModel.addListener("loadModel",this.convertCoords,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 memebers 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("topp:CITY_NAME"); //TBD: set this dynamically
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return labelNode?labelNode.firstChild.nodeValue:"No RSS title";
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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 coordSelectXpath = "topp:the_geom/gml:MultiPoint/gml:pointMember/gml:Point/gml:coordinates";//TBD: set this dynamically
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var coords = featureNode.selectSingleNode(coordSelectXpath);
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if (coords) {
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var point = coords.firstChild.nodeValue.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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