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|
module Puppet
class Parameter < Puppet::Element
class << self
attr_reader :validater, :munger, :name, :default
attr_accessor :ismetaparameter, :element
# This means that 'nil' is an invalid default value.
def defaultto(value = nil, &block)
if block
@default = block
else
@default = value
end
end
# Store documentation for this parameter.
def desc(str)
@doc = str
end
# This is how we munge the value. Basically, this is our
# opportunity to convert the value from one form into another.
def munge(&block)
# I need to wrap the unsafe version in begin/rescue statements,
# but if I directly call the block then it gets bound to the
# class's context, not the instance's, thus the two methods,
# instead of just one.
define_method(:unsafe_munge, &block)
define_method(:munge) do |*args|
begin
unsafe_munge(*args)
rescue Puppet::Error => detail
Puppet.debug "Reraising %s" % detail
raise
rescue => detail
raise Puppet::DevError, "Munging failed for class %s: %s" %
[self.name, detail]
end
end
#@munger = block
end
def inspect
"Parameter(#{self.name})"
end
# Mark whether we're the namevar.
def isnamevar
@isnamevar = true
@required = true
end
# Is this parameter the namevar? Defaults to false.
def isnamevar?
if defined? @isnamevar
return @isnamevar
else
return false
end
end
# This parameter is required.
def isrequired
@required = true
end
# Is this parameter required? Defaults to false.
def required?
if defined? @required
return @required
else
return false
end
end
def to_s
if self.ismetaparameter
"Puppet::Type::" + @name.to_s.capitalize
else
self.element.to_s + @name.to_s.capitalize
end
end
# Verify that we got a good value
def validate(&block)
#@validater = block
define_method(:unsafe_validate, &block)
define_method(:validate) do |*args|
begin
unsafe_validate(*args)
rescue ArgumentError, Puppet::Error, TypeError
raise
rescue => detail
raise Puppet::DevError,
"Validate method failed for class %s: %s" %
[self.name, detail]
end
end
end
end
# Just a simple method to proxy instance methods to class methods
def self.proxymethods(*values)
values.each { |val|
eval "def #{val}; self.class.#{val}; end"
}
end
# And then define one of these proxies for each method in our
# ParamHandler class.
proxymethods("required?", "isnamevar?")
attr_accessor :parent
# This doesn't work, because the instance_eval doesn't bind the inner block
# only the outer one.
# def munge(value)
# if munger = self.class.munger
# return @parent.instance_eval {
# munger.call(value)
# }
# else
# return value
# end
# end
#
# def validate(value)
# if validater = self.class.validater
# return @parent.instance_eval {
# validater.call(value)
# }
# end
# end
def default
default = self.class.default
if default.is_a?(Proc)
val = self.instance_eval(&default)
return val
else
return default
end
end
# This should only be called for parameters, but go ahead and make
# it possible to call for states, too.
def value
if self.is_a?(Puppet::State)
return self.should
else
if defined? @value
return @value
else
return nil
end
end
end
# Store the value provided. All of the checking should possibly be
# late-binding (e.g., users might not exist when the value is assigned
# but might when it is asked for).
def value=(value)
# If we're a state, just hand the processing off to the should method.
if self.is_a?(Puppet::State)
return self.should = value
end
if respond_to?(:validate)
validate(value)
end
if respond_to?(:munge)
value = munge(value)
end
@value = value
end
def inspect
s = "Parameter(%s = %s" % [self.name, self.value || "nil"]
if defined? @parent
s += ", @parent = %s)" % @parent
else
s += ")"
end
end
def name
self.class.name
end
def to_s
s = "Parameter(%s)" % self.name
end
end
end
|
