/**
 * Evaluate DSL expression and return filter value
 * @param dslExpression
 * @param filters
 * @return
 */
private String evalDslExpression(String dslExpression, Map<String, Filter> filters) {
    // Get filter name
    StringTokenizer dslTokenizer = new StringTokenizer(dslExpression, ".(");
    String filterName = dslTokenizer.nextToken();