public void info() {
        final ExpressionOperator expression = selectionToExpression(this.criteria, getSelection());
        validateExpression(expression, exp -> {
            final FindMetaCriteria criteria = expressionToNonPagedCriteria(exp);
            showSummary(
                    criteria,
                    DocumentPermission.VIEW,
                    null,
                    null,
                    "Selection Summary",
                    false,
                    null);
        });
    }
@param onSetExpression Called after the expression has been successfully
                       validated and set on the criteria. Can be null.
stroom-core-client/src/main/java/stroom/data/client/presenter/AbstractMetaListPresenter.java