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require 'puppet/provider'
require 'puppet/provider/confiner'
# A simple class for modeling encoding formats for moving
# instances around the network.
class Puppet::Network::Format
include Puppet::Provider::Confiner
attr_reader :name, :mime, :weight
def initialize(name, options = {}, &block)
@name = name.to_s.downcase.intern
if mime = options[:mime]
self.mime = mime
options.delete(:mime)
else
self.mime = "text/%s" % name
end
if weight = options[:weight]
@weight = weight
options.delete(:weight)
else
@weight = 5
end
unless options.empty?
raise ArgumentError, "Unsupported option(s) %s" % options.keys
end
instance_eval(&block) if block_given?
@intern_method = "from_%s" % name
@render_method = "to_%s" % name
@intern_multiple_method = "from_multiple_%s" % name
@render_multiple_method = "to_multiple_%s" % name
end
def intern(klass, text)
return klass.send(intern_method, text) if klass.respond_to?(intern_method)
raise NotImplementedError, "%s can not intern instances from %s" % [klass, mime]
end
def intern_multiple(klass, text)
return klass.send(intern_multiple_method, text) if klass.respond_to?(intern_multiple_method)
raise NotImplementedError, "%s can not intern multiple instances from %s" % [klass, mime]
end
def mime=(mime)
@mime = mime.to_s.downcase
end
def render(instance)
return instance.send(render_method) if instance.respond_to?(render_method)
raise NotImplementedError, "%s can not render instances to %s" % [instance.class, mime]
end
def render_multiple(instances)
# This method implicitly assumes that all instances are of the same type.
return instances[0].class.send(render_multiple_method, instances) if instances[0].class.respond_to?(render_multiple_method)
raise NotImplementedError, "%s can not intern multiple instances to %s" % [instances[0].class, mime]
end
def supported?(klass)
suitable? and
klass.respond_to?(intern_method) and
klass.respond_to?(intern_multiple_method) and
klass.respond_to?(render_multiple_method) and
klass.instance_methods.include?(render_method)
end
def to_s
"Puppet::Network::Format[%s]" % name
end
private
attr_reader :intern_method, :render_method, :intern_multiple_method, :render_multiple_method
end
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