@rr0/cms/dist/time/datasource/AbstractDatasource.js

RR0 Content Management System (CMS)

import { TimeContextFilter } from "./TimeContextFilter.js";
/**
 * Cache cases which were already fetched, and filter out cases in memory according to (time) context.
 */
export class AbstractDatasource {
    constructor(authors, copyright) {
        this.authors = authors;
        this.copyright = copyright;
        this.cases = new Map();
    }
    async getCases(context) {
        const contextKey = this.contextKey(context);
        let found = this.cases.get(contextKey);
        if (!found) {
            found = await this.readCases(context);
            this.cases.set(contextKey, found);
        }
        return found;
    }
    async fetch(context) {
        const summaries = await this.getCases(context);
        // TODO: This filter can only apply to RROUfoCases[], not S[]
        const contextFilter = this.createFilter(context);
        return summaries.filter(contextFilter.filter.bind(contextFilter));
    }
    createFilter(context) {
        return new TimeContextFilter(context); // By default
    }
    contextKey(context) {
        return context.time.toString();
    }
}