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Application.ts
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Application.ts
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import { IApplication } from './IApplication';
import { ICategoryCollection } from './ICategoryCollection';
import { IProjectInformation } from './IProjectInformation';
import { OperatingSystem } from './OperatingSystem';
export class Application implements IApplication {
constructor(public info: IProjectInformation, public collections: readonly ICategoryCollection[]) {
validateInformation(info);
validateCollections(collections);
}
public getSupportedOsList(): OperatingSystem[] {
return this.collections.map((collection) => collection.os);
}
public getCollection(operatingSystem: OperatingSystem): ICategoryCollection | undefined {
return this.collections.find((collection) => collection.os === operatingSystem);
}
}
function validateInformation(info: IProjectInformation) {
if (!info) {
throw new Error('undefined project information');
}
}
function validateCollections(collections: readonly ICategoryCollection[]) {
if (!collections) {
throw new Error('undefined collections');
}
if (collections.length === 0) {
throw new Error('no collection in the list');
}
if (collections.filter((c) => !c).length > 0) {
throw new Error('undefined collection in the list');
}
const osList = collections.map((c) => c.os);
const duplicates = getDuplicates(osList);
if (duplicates.length > 0) {
throw new Error('multiple collections with same os: ' +
duplicates.map((os) => OperatingSystem[os].toLowerCase()).join('", "'));
}
}
function getDuplicates(list: readonly OperatingSystem[]): OperatingSystem[] {
return list.filter((os, index) => list.indexOf(os) !== index);
}