sinProject-Inc/talk

export class BackgroundIndex {
    private readonly _index: number

    public constructor(index: number) {
        if (index < 0) throw new Error('id is not positive number')

        this._index = index
    }

    public static from_string(index_string?: string): BackgroundIndex {
        if (!index_string) {
            return new BackgroundIndex(0)
        }

        const index = parseInt(index_string)

        if (isNaN(index)) throw new Error('index is not number')

        return new BackgroundIndex(index)
    }

    public get index(): number {
        return this._index
    }
}