class RubyXL::ColumnRanges

def before_write_xml
  !(column_ranges.nil? || column_ranges.empty?)
end

def find(col_index)
  column_ranges && column_ranges.find { |range| range.include?(col_index) }
end

def get_range(col_index)
  col_num = col_index + 1
  old_range = self.find(col_index)
  if old_range.nil? then
    new_range = RubyXL::ColumnRange.new(:min => col_num, :max => col_num)
    self.column_ranges << new_range
    return new_range
  elsif old_range.min == col_num && 
          old_range.max == col_num then # Single column range, OK to change in place

    return old_range
  else
    raise "Range splitting not implemented yet"
  end
end

def insert_column(col_index)
  column_ranges && column_ranges.each { |range| range.insert_column(col_index) }
end