def compare(y)
x = self
return 0 if x.nevra == y.nevra
if x.n.nil? == false and y.n.nil?
return 1
elsif x.n.nil? and y.n.nil? == false
return -1
elsif x.n.nil? == false and y.n.nil? == false
if x.n < y.n
return -1
elsif x.n > y.n
return 1
end
end
if x.version > y.version
return 1
elsif x.version < y.version
return -1
end
if x.a.nil? == false and y.a.nil?
return 1
elsif x.a.nil? and y.a.nil? == false
return -1
elsif x.a.nil? == false and y.a.nil? == false
if x.a < y.a
return -1
elsif x.a > y.a
return 1
end
end
return 0
end