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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 an OWS Context document as defined by the OGC interoperability
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* experiment. This model should be eventually merged with the standard OGC
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* context doc.
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* Listeners supported by this model:
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* "refresh" called when window parameters (width/height, bbox) are changed
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* "hidden" called when visibilty of a layer is changed
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* "wfs_getFeature" called when feature resources are loaded
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*
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* @constructor
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* @base ModelBase
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* @author Mike Adair
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* @requires Sarissa
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*
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*/
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function OwsContext(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.namespace = "xmlns:wmc='http://www.opengis.net/context' xmlns:ows='http://www.opengis.net/ows' xmlns:ogc='http://www.opengis.net/ogc' xmlns:xsl='http://www.w3.org/1999/XSL/Transform' xmlns:xlink='http://www.w3.org/1999/xlink'";
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// ===============================
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// Update of Context Parameters
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// ===============================
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/**
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* Change a Layer's visibility.
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* @param layerName The name of the layer that is to be changed
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* @param hidden String with the value to be set; 1=hidden, 0=visible.
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*/
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this.setHidden=function(layerName, hidden){
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// Set the hidden attribute in the Context
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var hiddenValue = "0";
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if (hidden) hiddenValue = "1";
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var layer=this.getFeatureNode(layerName);
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layer.setAttribute("hidden", hiddenValue);
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// Call the listeners
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this.callListeners("hidden", layerName);
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}
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/**
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* Get the layer's visiblity attribute value.
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* @param layerName The name of the layer that is to be changed
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* @return hidden String with the value; 1=hidden, 0=visible.
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*/
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this.getHidden=function(layerName){
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var hidden=1;
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var layer=this.getFeatureNode(layerName)
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return layer.getAttribute("hidden");
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}
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/**
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* Get the BoundingBox.
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* @return BoundingBox array in form (xmin,ymin,xmax,ymax).
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*/
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this.getBoundingBox=function() {
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// Extract BoundingBox from the context
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//boundingBox=this.doc.documentElement.getElementsByTagName("BoundingBox").item(0);
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var lowerLeft=this.doc.selectSingleNode("/wmc:OWSContext/wmc:General/ows:BoundingBox/ows:LowerCorner");
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var upperRight=this.doc.selectSingleNode("/wmc:OWSContext/wmc:General/ows:BoundingBox/ows:UpperCorner");
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var strBbox = new String(lowerLeft.firstChild.nodeValue + " " + upperRight.firstChild.nodeValue).split(" ");
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var bbox = new Array();
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for (i=0; i<strBbox.length; ++i) {
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bbox[i] = parseFloat(strBbox[i]);
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}
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return bbox;
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}
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/**
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* Set the BoundingBox element and call the refresh listeners
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* @param boundingBox array in the sequence (xmin, ymin, xmax, ymax).
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*/
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this.setBoundingBox=function(boundingBox) {
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// Set BoundingBox in context
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var lowerLeft=this.doc.selectSingleNode("/wmc:OWSContext/wmc:General/ows:BoundingBox/ows:LowerCorner");
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lowerLeft.firstChild.nodeValue = boundingBox[0] + " " + boundingBox[1];
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var upperRight=this.doc.selectSingleNode("/wmc:OWSContext/wmc:General/ows:BoundingBox/ows:UpperCorner");
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upperRight.firstChild.nodeValue = boundingBox[2] + " " + boundingBox[3];
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// Call the listeners
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this.callListeners("bbox");
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}
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/**
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* Set the Spacial Reference System for layer display and layer requests.
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* @param srs The Spatial Reference System.
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*/
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this.setSRS=function(srs) {
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//bbox=this.doc.documentElement.getElementsByTagName("BoundingBox").item(0);
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var bbox=this.doc.selectSingleNode("/wmc:OWSContext/wmc:General/ows:BoundingBox");
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bbox.setAttribute("crs",srs);
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this.callListeners("srs");
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}
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/**
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* Set the Spacial Reference System for layer display and layer requests.
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* @return srs The Spatial Reference System.
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*/
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this.getSRS=function() {
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//bbox=this.doc.documentElement.getElementsByTagName("BoundingBox").item(0);
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var bbox=this.doc.selectSingleNode("/wmc:OWSContext/wmc:General/ows:BoundingBox");
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srs=bbox.getAttribute("crs");
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return srs;
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}
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/**
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* Get the Window width.
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* @return width The width of map window from the context document
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*/
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this.getWindowWidth=function() {
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//var win=this.doc.documentElement.getElementsByTagName("Window").item(0);
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var win=this.doc.selectSingleNode("/wmc:OWSContext/wmc:General/wmc:Window");
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width=win.getAttribute("width");
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return width;
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}
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/**
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* Set the Window width.
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* @param width The width of map window (therefore of map layer images).
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*/
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this.setWindowWidth=function(width) {
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//win=this.doc.documentElement.getElementsByTagName("Window").item(0);
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var win=this.doc.selectSingleNode("/wmc:OWSContext/wmc:General/wmc:Window");
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win.setAttribute("width", width);
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this.callListeners("resize");
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}
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/**
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* Get the Window height.
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* @return height The height of map window from the context document.
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*/
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this.getWindowHeight=function() {
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//var win=this.doc.documentElement.getElementsByTagName("Window").item(0);
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var win=this.doc.selectSingleNode("/wmc:OWSContext/wmc:General/wmc:Window");
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height=win.getAttribute("height");
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return height;
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}
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/**
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* Set the Window height.
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* @param height The height of map window (therefore of map layer images).
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*/
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this.setWindowHeight=function(height) {
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//win=this.doc.documentElement.getElementsByTagName("Window").item(0);
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var win=this.doc.selectSingleNode("/wmc:OWSContext/wmc:General/wmc:Window");
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win.setAttribute("height", height);
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this.callListeners("resize");
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}
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/**
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* Returns the serverUrl for the layer passed in as the feature argument.
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* @param requestName ignored for context docs (only GetMap supported)
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* @param method ignored for context docs (only GET supported)
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* @param feature the node for the feature from the context doc
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* @return height String URL for the GetMap request
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*/
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this.getServerUrl = function(requestName, method, feature) {
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return feature.selectSingleNode("wmc:Server/wmc:OnlineResource").getAttribute("xlink:href");
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}
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/**
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* Returns the WMS version for the layer passed in as the feature argument
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* @param feature the node for the feature from the context doc
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* @return the WMS GetMap version for the Layer.
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*/
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this.getVersion = function(feature) {
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return feature.selectSingleNode("wmc:Server").getAttribute("version");
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}
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/**
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* Get HTTP method for the specified feature
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* @param feature the Layer node from the context doc
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* @return the HTTP method to get the feature with
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*/
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this.getMethod = function(feature) {
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return feature.selectSingleNode("wmc:Server/wmc:OnlineResource").getAttribute("wmc:method");
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}
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/**
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* returns a node that has the specified feature name in the context doc
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* @param featureName Name element value to return
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* @return the node from the context doc with the specified feature name
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*/
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this.getFeatureNode = function(featureName) {
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return this.doc.selectSingleNode(this.nodeSelectXpath+"/*[wmc:Name='"+featureName+"']");
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}
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/**
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* listener method which loads WFS features from the context doc, after WMS
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* layers are loaded.
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* @param objRef Pointer to this object.
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*/
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this.loadFeatures = function(objRef) {
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var nodeSelectXpath = objRef.nodeSelectXpath + "/wmc:FeatureType[wmc:Server/@service='OGC:WFS']/wmc:Name";
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var featureList = objRef.doc.selectNodes(nodeSelectXpath);
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for (var i=0; i<featureList.length; i++) {
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var featureName = featureList[i].firstChild.nodeValue;
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objRef.setParam('wfs_GetFeature',featureName);
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}
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}
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this.addListener("loadModel", this.loadFeatures, this);
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/**
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* Listener function which sets stylesheet params for WebServiceRequests
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* @param objRef pointer to this object
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* @param featureNodeId the id of the node in the doc to be processed by the stylesheet
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*/
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this.setRequestParameters = function(featureName, requestStylesheet) {
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var feature = this.getFeatureNode(featureName);
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if (feature.selectSingleNode("ogc:Filter")) {
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requestStylesheet.setParameter("filter", escape(Sarissa.serialize(feature.selectSingleNode("ogc:Filter"))) );
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}
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}
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//this.addFirstListener("wfs_GetFeature", this.setRequestParameters, this);
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/**
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* Method to get a list of queryable layers
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* @return the list with queryable layers
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*/
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this.getQueryableLayers = function() {
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var listNodeArray = this.doc.selectNodes("/wmc:OWSContext/wmc:ResourceList/wmc:Layer[attribute::queryable='1']/wmc:Name");
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return listNodeArray;
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}
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/**
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* Method to get a list of all layers in the context doc
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* TBD: merge this with above, passing queryable as an optional boolean param?
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* @return the list with all layers
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*/
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this.getAllLayers = function() {
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var listNodeArray = this.doc.selectNodes("/wmc:OWSContext/wmc:ResourceList/wmc:Layer");
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return listNodeArray;
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}
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/**
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* Method to get a layer with the specified name in the context doc
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* @param layerName the layer to be returned
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* @return the list with all layers
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*/
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this.getLayer = function(layerName) {
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var layer = this.doc.selectSingleNode("/wmc:OWSContext/wmc:ResourceList/wmc:Layer[wmc:Name='"+layerName+"']");
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//TBD: add in time stamp
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return layer;
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}
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}
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