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Contents
module Alf
class Adapter
class Folder
class Connection < Adapter::Connection
alias :folder :conn_spec
# Returns true if `name` is known, false otherwise.
def knows?(name)
!find_file(name).nil?
end
# Returns a cog for `expr` inside the compilation plan `plan`
def cog(plan, expr)
name = expr.name
if f = find_file(name)
reader = Reader.reader(find_file(name))
Alf::Engine::Leaf.new(reader, expr)
else
raise NoSuchRelvarError, "Unable to find a file for #{name}"
end
end
protected
# Finds a specific file by name
#
# @param [String] name the name of a dataset
# @return [Path] path to an existing file if it exists, nil otherwise.
def find_file(name)
if (explicit = folder/name.to_s).file?
explicit
else
folder.glob("#{name}.*").find{|f| f.file?}
end
end
end # class Connection
end # class Folder
end # class Adapter
end # module Alf
Version data entries
5 entries across 5 versions & 1 rubygems