package pgtype

<%
  [
    ["Int4range", "Int4"],
    ["Int8range", "Int8"],
    ["Numrange", "Numeric"],
    ["Tsrange", "Timestamp"],
    ["Tstzrange", "Timestamptz"],
    ["Daterange", "Date"],
    ["Float8range", "Float8"]
  ].each do |range_type, element_type|
%>
type <%= range_type %> struct {
	Lower     <%= element_type %>
	Upper     <%= element_type %>
	LowerType BoundType
	UpperType BoundType
	Valid     bool
}

func (r <%= range_type %>) IsNull() bool {
	return !r.Valid
}

func (r <%= range_type %>) BoundTypes() (lower, upper BoundType) {
	return r.LowerType, r.UpperType
}

func (r <%= range_type %>) Bounds() (lower, upper interface{}) {
	return &r.Lower, &r.Upper
}

func (r *<%= range_type %>) ScanNull() error {
	*r = <%= range_type %>{}
	return nil
}

func (r *<%= range_type %>) ScanBounds() (lowerTarget, upperTarget interface{}) {
	return &r.Lower, &r.Upper
}

func (r *<%= range_type %>) SetBoundTypes(lower, upper BoundType) error {
  if lower == Unbounded || lower == Empty {
    r.Lower = <%= element_type %>{}
  }
  if upper == Unbounded || upper == Empty {
    r.Upper = <%= element_type %>{}
  }
	r.LowerType = lower
	r.UpperType = upper
	r.Valid = true
	return nil
}

<% end %>