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module Arel
module Nodes
class Window < Arel::Nodes::Node
include Arel::Expression
attr_accessor :orders, :framing
def initialize
@orders = []
end
def order *expr
# FIXME: We SHOULD NOT be converting these to SqlLiteral automatically
@orders.concat expr.map { |x|
String === x || Symbol === x ? Nodes::SqlLiteral.new(x.to_s) : x
}
self
end
def frame(expr)
raise ArgumentError, "Window frame cannot be set more than once" if @frame
@framing = expr
end
def rows(expr = nil)
frame(Rows.new(expr))
end
def range(expr = nil)
frame(Range.new(expr))
end
def initialize_copy other
super
@orders = @orders.map { |x| x.clone }
end
end
class NamedWindow < Window
attr_accessor :name
def initialize name
super()
@name = name
end
def initialize_copy other
super
@name = other.name.clone
end
end
class Rows < Unary
def initialize(expr = nil)
super(expr)
end
end
class Range < Unary
def initialize(expr = nil)
super(expr)
end
end
class CurrentRow < Arel::Nodes::Node; end
class Preceding < Unary
def initialize(expr = nil)
super(expr)
end
end
class Following < Unary
def initialize(expr = nil)
super(expr)
end
end
end
end
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