}

    public List<WorkspaceReader> getReaders() {
        return readers;
    }

    public void addReader(WorkspaceReader workspaceReader) {
        requireNonNull(workspaceReader, "workspaceReader");
        ArrayList<WorkspaceReader> newReaders = new ArrayList<>(this.readers);
        newReaders.add(workspaceReader);
        setReaders(newReaders);
    }

    private static class Key {