Method getByName

src/query/expression/ExpressionFactory.java:87–94

Returns the expression function given the name @param function The name of the expression to use @return The expression when located @throws UnsupportedOperationException if the requested function hasn't been stored in the map.

(final String function)

   * been stored in the map.
   */
  public static Expression getByName(final String function) {
    final Expression expression = available_functions.get(function);
    if (expression == null) {
      throw new UnsupportedOperationException("Function " + function 
          + " has not been implemented");
    }
    return expression;
  }
}