21 lines
785 B
TypeScript
21 lines
785 B
TypeScript
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/// Given a feature source, calculates a list of OSM-contributors who mapped the latest versions
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import FeatureSource from "./FeatureSource/FeatureSource";
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import {UIEventSource} from "./UIEventSource";
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export default class ContributorCount {
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public readonly Contributors: UIEventSource<Map<string, number>>;
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constructor(featureSource: FeatureSource) {
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this.Contributors = featureSource.features.map(features => {
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const hist = new Map<string, number>();
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for (const feature of features) {
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const contributor = feature.feature.properties["_last_edit:contributor"]
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const count = hist.get(contributor) ?? 0;
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hist.set(contributor, count + 1)
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}
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return hist;
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})
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}
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}
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