Class: XMLRPCStruct

Inherits:
Hash
  • Object
show all
Defined in:
lib/ec2/amitools/util.rb

Overview

Base class for XML-RPC structures. Stores key and values pairs. Key names are mapped to method names by converting ‘-’ to ‘_’ characters.

Instance Method Summary collapse

Constructor Details

#initialize(members) ⇒ XMLRPCStruct

members A list of the structure’s key names or nil if any key names are allowed.



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# File 'lib/ec2/amitools/util.rb', line 73

def initialize members
  unless members.kind_of? Array or members.nil?
    raise ArgumentError.new( "invalid members argument" )
  end
  @members = members
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_symbol, argument = nil) ⇒ Object

Provide direct access to individual instance elements by methods named after the element’s key.



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# File 'lib/ec2/amitools/util.rb', line 82

def method_missing( method_symbol, argument=nil )
  # Here kid, play with this loaded gun...
  method = method_symbol.to_s
  
  # Determine if setter or getter call and remove '=' if setter.
  setter = /[\S]+=/.match(method)
  member = (setter ? method.slice(0, method.size - 1) : method)
  
  # Map method name to member name.
  member = member.gsub('_', '-')
 
  # If valid attribute set or get accordingly. If the member list is nil then
  # any members are allowed.
  if @members.nil? or @members.include?( member )
    if setter
      raise ArgumentError, "value for key #{member} may not be nil" if argument.nil?
      self[member] = argument
    else
      self[member]
    end
  else
    raise NoMethodError.new( method )
  end
end