'use strict';
const basicFC = require('./basicFC.js')();
/**
* Searches for a layer title defined by a wms.
* @function getWMSLayerTitle
* @private
* @param {Object} wmsLayer esri layer object for the wms
* @param {String} wmsLayerId layers id as defined in the wms (i.e. not wmsLayer.id)
* @return {String} layer title as defined on the service, '' if no title defined
*/
function getWMSLayerTitle(wmsLayer, wmsLayerId) {
// TEST STATUS none
// TODO move this to ogc.js module?
// crawl esri layerInfos (which is a nested structure),
// returns sublayer that has matching id or null if not found.
// written as function to allow recursion
const crawlSubLayers = (subLayerInfos, wmsLayerId) => {
let targetEntry = null;
// we use .some to allow the search to stop when we find something
subLayerInfos.some(layerInfo => {
// wms ids are stored in .name
if (layerInfo.name === wmsLayerId) {
// found it. save it and exit the search
targetEntry = layerInfo;
return true;
} else if (layerInfo.subLayers) {
// search children. if in children, will exit search, else will continue
return crawlSubLayers(layerInfo.subLayers, wmsLayerId);
} else {
// continue search
return false;
}
});
return targetEntry;
};
// init search on root layerInfos, then process result
const match = crawlSubLayers(wmsLayer.layerInfos, wmsLayerId);
if (match && match.title) {
return match.title;
} else {
return ''; // falsy!
}
}
/**
* @class WmsFC
*/
class WmsFC extends basicFC.BasicFC {
getSymbology () {
// TEST STATUS none
if (!this._symbology) {
const configLayerEntries = this._parent.config.layerEntries;
const gApi = this._parent._apiRef;
const legendArray = gApi.layer.ogc
.getLegendUrls(this._parent._layer, configLayerEntries.map(le => le.id))
.map((imageUri, idx) => {
const symbologyItem = {
name: null,
svgcode: null
};
// config specified name || server specified name || config id
const name = configLayerEntries[idx].name ||
getWMSLayerTitle(this._parent._layer, configLayerEntries[idx].id) ||
configLayerEntries[idx].id;
gApi.symbology.generateWMSSymbology(name, imageUri).then(data => {
symbologyItem.name = data.name;
symbologyItem.svgcode = data.svgcode;
});
return symbologyItem;
});
this._symbology = Promise.resolve(legendArray);
}
return this._symbology;
}
}
module.exports = () => ({
WmsFC
});