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/*
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License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
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Dependancies: Context
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$Id: WfsGetFeature.js 3899 2008-03-03 10:33:30Z ahocevar $
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*/
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// Ensure this object's dependancies are loaded.
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mapbuilder.loadScript(baseDir+"/widget/ButtonBase.js");
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mapbuilder.loadScript(baseDir+"/util/openlayers/OpenLayers.js");
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/**
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* Builds then sends a WFS GetFeature GET request based on the WMC
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* coordinates and click point.
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* @constructor
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* @base ButtonBase
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* @author Cameron Shorter
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* @param widgetNode The XML node in the Config file referencing this object.
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* @param model The Context object which this tool is associated with.
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*/
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function WfsGetFeature(widgetNode, model) {
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// Extend ButtonBase
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ButtonBase.apply(this, new Array(widgetNode, model));
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this.widgetNode = widgetNode;
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// id of the transactionResponseModel
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this.trm = this.getProperty("mb:transactionResponseModel");
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this.httpPayload = new Object({
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method: "get",
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postData: null
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});
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this.typeName = this.getProperty('mb:typeName');
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this.maxFeatures = this.getProperty('mb:maxFeatures', 1);
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this.webServiceUrl= this.getProperty('mb:webServiceUrl');
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this.webServiceUrl += this.webServiceUrl.indexOf("?") > -1 ? '&' : '?';
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this.webServiceSrs= new OpenLayers.Projection(this.getProperty('mb:webServiceSrs', "EPSG:4326"));
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// override default cursor by user
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// cursor can be changed by spefying a new cursor in config file
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this.cursor = "pointer";
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this.createControl = function(objRef) {
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var transactionResponseModel = config.objects[objRef.trm];
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var Control = OpenLayers.Class( OpenLayers.Control, {
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CLASS_NAME: 'mbControl.WfsGetFeature',
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type: OpenLayers.Control.TYPE_TOOL, // constant from OpenLayers.Control
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tolerance: new Number(objRef.getProperty('mb:tolerance')),
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httpPayload: objRef.httpPayload,
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maxFeatures: objRef.maxFeatures,
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webServiceUrl: objRef.webServiceUrl,
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transactionResponseModel: transactionResponseModel,
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draw: function() {
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this.handler = new OpenLayers.Handler.Box( this,
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{done: this.selectBox}, {keyMask: this.keyMask} );
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},
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selectBox: function (position) {
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var bounds, minXY, maxXY;
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if (position instanceof OpenLayers.Bounds) {
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// it's a box
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minXY = this.map.getLonLatFromPixel(
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new OpenLayers.Pixel(position.left, position.bottom));
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maxXY = this.map.getLonLatFromPixel(
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new OpenLayers.Pixel(position.right, position.top));
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} else {
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// it's a pixel
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minXY = this.map.getLonLatFromPixel(
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new OpenLayers.Pixel(position.x-this.tolerance, position.y+this.tolerance));
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maxXY = this.map.getLonLatFromPixel(
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new OpenLayers.Pixel(position.x+this.tolerance, position.y-this.tolerance));
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}
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bounds = new OpenLayers.Bounds(minXY.lon, minXY.lat, maxXY.lon, maxXY.lat);
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if (this.map.projection.projCode != this.objRef.webServiceSrs.projCode) {
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bounds.transform(this.map.projection, this.objRef.webServiceSrs);
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}
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var typeName = objRef.typeName;
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if (!typeName) {
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var queryList=objRef.targetModel.getQueryableLayers();
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if (queryList.length==0) {
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alert(mbGetMessage("noQueryableLayers"));
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return;
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}
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else {
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typeName = "";
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for (var i=0; i<queryList.length; ++i) {
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var layerNode = queryList[i];
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// Get the name of the layer
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var layerName = layerNode.selectSingleNode("wmc:Name");
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layerName=(layerName)?getNodeValue(layerName):"";
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// Get the layerId. Fallback to layerName if non-existent
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var layerId = layerNode.getAttribute("id") || layerName;
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var hidden = objRef.targetModel.getHidden(layerId);
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if (hidden == 0) { //query only visible layers
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if (typeName != "") {
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typeName += ",";
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}
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typeName += layerName;
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}
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}
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}
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}
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if (typeName=="") {
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alert(mbGetMessage("noQueryableLayersVisible"));
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return;
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}
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// now create request url
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this.httpPayload.url = this.webServiceUrl+OpenLayers.Util.getParameterString({
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SERVICE: "WFS",
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VERSION: "1.0.0",
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REQUEST: "GetFeature",
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TYPENAME: typeName,
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MAXFEATURES: this.maxFeatures,
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BBOX: bounds.toBBOX()
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});
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this.transactionResponseModel.newRequest(this.transactionResponseModel, this.httpPayload);
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}
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});
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return Control;
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}
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}
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