'use strict';
const attribFC = require('./attribFC.js')();
const placeholderFC = require('./placeholderFC.js')();
const attribRecord = require('./attribRecord.js')();
const layerInterface = require('./layerInterface.js')();
const shared = require('./shared.js')();
/**
* @class FeatureRecord
*/
class FeatureRecord extends attribRecord.AttribRecord {
// TODO add flags for file based layers?
/**
* Create a layer record with the appropriate geoApi layer type. Layer config
* should be fully merged with all layer options defined (i.e. this constructor
* will not apply any defaults).
* @param {Object} layerClass the ESRI api object for feature layers
* @param {Object} esriRequest the ESRI api object for making web requests with proxy support
* @param {Object} apiRef object pointing to the geoApi. allows us to call other geoApi functions.
* @param {Object} config layer config values
* @param {Object} esriLayer an optional pre-constructed layer
* @param {Function} epsgLookup an optional lookup function for EPSG codes (see geoService for signature)
*/
constructor (layerClass, esriRequest, apiRef, config, esriLayer, epsgLookup) {
// TODO if we have nothing to add here, delete this constructor
// TODO might need to add a placeholder here with stuff like
// this._defaultFC = '0';
// this._featClasses['0'] = placeholder;
super(layerClass, esriRequest, apiRef, config, esriLayer, epsgLookup);
// handles placeholder symbol, possibly other things
this._defaultFC = '0';
this._featClasses['0'] = new placeholderFC.PlaceholderFC(this, this.name);
this._geometryType = undefined;
this._fcount = undefined;
}
// TODO ensure whoever is making layers from config fragments is also setting the feature index.
// remove comment once that is done
makeLayerConfig () {
const cfg = super.makeLayerConfig();
cfg.mode = this.config.state.snapshot ? this._layerClass.MODE_SNAPSHOT
: this._layerClass.MODE_ONDEMAND;
// TODO confirm this logic. old code mapped .options.snapshot.value to the button -- meaning if we were in snapshot mode,
// we would want the button disabled. in the refactor, the button may get it's enabled/disabled from a different source.
// this.config.state.snapshot = !this.config.state.snapshot;
this._snapshot = this.config.state.snapshot;
return cfg;
}
getGeomType () {
// standard case, layer has no geometry. This gets overridden in feature-based Record classes.
return this._geometryType;
}
// returns the proxy interface object for the root of the layer (i.e. main entry in legend, not nested child things)
// TODO docs
getProxy () {
// TODO figure out control name arrays from config (specifically disabled stuff)
// updated config schema uses term "enabled" but have a feeling it really means available
// TODO figure out how placeholders work with all this
if (!this._rootProxy) {
this._rootProxy = new layerInterface.LayerInterface(this, this.initialConfig.controls);
this._rootProxy.convertToFeatureLayer(this);
}
return this._rootProxy;
}
/**
* Triggers when the layer loads.
*
* @function onLoad
*/
onLoad () {
const loadPromises = super.onLoad();
// set up attributes, set up children bundles.
const attributeBundle = this._apiRef.attribs.loadLayerAttribs(this._layer);
// feature has only one layer
const idx = attributeBundle.indexes[0];
const aFC = new attribFC.AttribFC(this, idx, attributeBundle[idx], this.config);
aFC.nameField = this.config.nameField;
this._defaultFC = idx;
this._featClasses[idx] = aFC;
const pLS = aFC.loadSymbology();
// update asynch data
const pLD = aFC.getLayerData().then(ld => {
this._geometryType = ld.geometryType;
});
const pFC = this.getFeatureCount().then(fc => {
this._fcount = fc;
});
loadPromises.push(pLD, pFC, pLS);
Promise.all(loadPromises).then(() => {
this._stateChange(shared.states.LOADED);
});
}
getFeatureCount () {
// just use the layer url (or lack of in case of file layer)
return super.getFeatureCount(this._layer.url);
}
isFileLayer () {
// TODO revisit. is it robust enough?
return this._layer && this._layer.url === '';
}
// TODO determine who is setting this. if we have an internal
// snapshot process, it might become a read-only property
get isSnapshot () { return this._snapshot; }
set isSnapshot (value) { this._snapshot = value; }
get layerType () { return shared.clientLayerType.ESRI_FEATURE; }
get featureCount () { return this._fcount; }
onMouseOver (e) {
if (this._hoverListeners.length > 0) {
// TODO add in quick lookup for layers that dont have attributes loaded yet
const showBundle = {
type: 'mouseOver',
point: e.screenPoint,
target: e.target
};
// tell anyone listening we moused into something
this._fireEvent(this._hoverListeners, showBundle);
// pull metadata for this layer.
this.getLayerData().then(lInfo => {
// TODO this will change a bit after we add in quick lookup. for now, get all attribs
return Promise.all([Promise.resolve(lInfo), this.getAttribs()]);
}).then(([lInfo, aInfo]) => {
// graphic attributes will only have the OID if layer is server based
const oid = e.graphic.attributes[lInfo.oidField];
// get name via attribs and name field
const featAttribs = aInfo.features[aInfo.oidIndex[oid]].attributes;
const featNamePromise = this.getFeatureName(oid, featAttribs);
// get icon via renderer and geoApi call
const svgcode = this._apiRef.symbology.getGraphicIcon(featAttribs, lInfo.renderer);
featNamePromise.then(featName => {
// duplicate the position so listener can verify this event is same as mouseOver event above
const loadBundle = {
type: 'tipLoaded',
name: featName,
target: e.target,
svgcode
};
// tell anyone listening we moused into something
this._fireEvent(this._hoverListeners, loadBundle);
});
});
}
}
onMouseOut (e) {
// tell anyone listening we moused out
const outBundle = {
type: 'mouseOut',
target: e.target
};
this._fireEvent(this._hoverListeners, outBundle);
}
/**
* Run a query on a feature layer, return the result as a promise. Fills the panelData array on resolution. // TODO update
* @function identify
* @param {Object} opts additional argumets like map object, clickEvent, etc.
* @returns {Object} an object with identify results array and identify promise resolving when identify is complete; if an empty object is returned, it will be skipped
*/
identify (opts) {
// TODO add full documentation for options parameter
// TODO fix these params
// TODO legendEntry.name, legendEntry.symbology appear to be fast links to populate the left side of the results
// view. perhaps it should not be in this object anymore?
// TODO see how the client is consuming the internal pointer to layerRecord. this may also now be
// directly available via the legend object.
const identifyResult =
new shared.IdentifyResult('legendEntry.name', 'legendEntry.symbology', 'EsriFeature',
this, this._defaultFC);
// run a spatial query
const qry = new this._apiRef.layer.Query();
qry.outFields = ['*']; // this will result in just objectid fields, as that is all we have in feature layers
// more accurate results without making the buffer if we're dealing with extents
// polygons from added file need buffer
// TODO further investigate why esri is requiring buffer for file-based polygons. logic says it shouldnt
if (this._layer.geometryType === 'esriGeometryPolygon' && !this.isFileLayer()) {
qry.geometry = opts.geometry;
} else {
qry.geometry = this.makeClickBuffer(opts.clickEvent.mapPoint, opts.map, this.clickTolerance);
}
const identifyPromise = Promise.all([
this.getAttribs(),
Promise.resolve(this._layer.queryFeatures(qry)),
this.getLayerData()
])
.then(([attributes, queryResult, layerData]) => {
// transform attributes of query results into {name,data} objects one object per queried feature
//
// each feature will have its attributes converted into a table
// placeholder for now until we figure out how to signal the panel that
// we want to make a nice table
identifyResult.isLoading = false;
identifyResult.data = queryResult.features.map(
feat => {
// grab the object id of the feature we clicked on.
const objId = feat.attributes[layerData.oidField];
const objIdStr = objId.toString();
// use object id find location of our feature in the feature array, and grab its attributes
const featAttribs = attributes.features[attributes.oidIndex[objIdStr]];
return {
name: this.getFeatureName(objIdStr, featAttribs),
data: this.attributesToDetails(featAttribs, layerData.fields),
oid: objId,
symbology: [
{ svgcode: this._apiRef.symbology.getGraphicIcon(featAttribs, layerData.renderer) }
]
};
});
});
return { identifyResults: [identifyResult], identifyPromise };
}
}
module.exports = () => ({
FeatureRecord
});