mapcomplete/Logic/FeatureSource/FeatureDuplicatorPerLayer.ts

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import FeatureSource from "./FeatureSource";
import {UIEventSource} from "../UIEventSource";
import LayerConfig from "../../Customizations/JSON/LayerConfig";
/**
* In some rare cases, some elements are shown on multiple layers (when 'passthrough' is enabled)
* If this is the case, multiple objects with a different _matching_layer_id are generated.
* If not, the _feature_layter_id is added
*/
export default class FeatureDuplicatorPerLayer implements FeatureSource {
public readonly features: UIEventSource<{ feature: any; freshness: Date }[]>;
constructor(layers: UIEventSource<{ layerDef: LayerConfig }[]>, upstream: FeatureSource) {
this.features = upstream.features.map(features => {
const newFeatures: { feature: any, freshness: Date }[] = [];
if(features === undefined){
return newFeatures;
}
for (const f of features) {
if (f.feature._matching_layer_id) {
// Already matched previously
// We simply add it
newFeatures.push(f);
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continue;
}
let foundALayer = false;
for (const layer of layers.data) {
if (layer.layerDef.overpassTags.matchesProperties(f.feature.properties)) {
foundALayer = true;
if (layer.layerDef.passAllFeatures) {
// We copy the feature; the "properties" field is kept identical though!
// Keeping "properties" identical is needed, as it might break the 'allElementStorage' otherwise
const newFeature = {
geometry: f.feature.geometry,
id: f.feature.id,
type: f.feature.type,
properties: f.feature.properties,
_matching_layer_id : layer.layerDef.id
}
newFeatures.push({feature: newFeature, freshness: f.freshness});
} else {
// If not 'passAllFeatures', we are done
f.feature._matching_layer_id = layer.layerDef.id;
newFeatures.push(f);
break;
}
}
}
}
return newFeatures;
})
}
}