}

    @Override
    public PasswordCredentials getCredentials() {
        invalidateDescriptor();
        return delegate.getCredentials();
    }

    @Override
    public <T extends Credentials> T getCredentials(Class<T> credentialsType) {
        invalidateDescriptor();
        return delegate.getCredentials(credentialsType);
    }

    @Override

            descriptor = createDescriptor();
        }
        return descriptor;
    }

    protected void invalidateDescriptor() {
        descriptor = null;
    }

    protected abstract T createDescriptor();

    @Override
    public void setName(String name) {
        invalidateDescriptor();
        super.setName(name);
    }

    @Override
    public void setDirs(Iterable<?> dirs) {
        invalidateDescriptor();
        this.dirs.clear();
        CollectionUtils.addAll(this.dirs, dirs);
    }

    @Override
    public void dir(Object dir) {
        dirs(dir);
    }

    @Override
    public void dirs(Object... dirs) {
        invalidateDescriptor();
        this.dirs.addAll(Arrays.asList(dirs));
    }