/**
     * Retrieves non expired locks for this item.
     * @returns  Enumerable with information about locks.
     */
    public async getActiveLocks(): Promise<LockInfo[]> {
        const locks = await this.getLocks();
        if (locks === null) {
            return new Array<LockInfo>();
        }

        const lockInfoList = locks.map(l => new LockInfo(
            l.level,
            l.isDeep,
            l.lockToken,
            l.expiration === (new Date(8640000000000000).getTime()) ?
                (new Date(8640000000000000).getTime()) :
                Math.ceil(l.expiration - Date.now()),
            l.clientOwner,
            l.lockRoot
        ));

        return lockInfoList;
    }