view/config/config_manager.rb

# config_manager.rb: the class definition of Edmaru::ConfigManager
#
# Copyright (C) 2007 Takashi Nakamoto
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA.
#

require "config/config_element.rb"
require "config/standard_validators.rb"

module Edmaru::Config

  #The instance of this class manages the whole configurations of Edmaru.
  class ConfigManager
    DEFAULT_CONFIG_FILES = 
      ["gtk/gtk_config.rb",
       "ncurses/ncurses_config.rb"]
    @@default_elements = Array.new

    #Initilizer.
    #
    #=== Return
    #An initilized instance of Edmaru::ConfigManager.
    def initialize
      @hash = Hash.new

      DEFAULT_CONFIG_FILES.each{ |file|
        require file
      }
      @@default_elements.each{ |element|
        add_element(element)
      }
    end

    #Add a new element.
    def add_element(element)
      @hash[element.key] = element
    end

    #Changed the specified configuration value.
    def []=(key, val)
      if @hash.include?(key)
        @hash[key].value = val
      else
        #ToDo: How should we deal with unrecognized configuration keys?
        raise "Unknown key: #{key}"
      end
    end

    #Get the specified configuration value.
    def [](key)
      if @hash.include?(key)
        return @hash[key].value
      else
        return nil
      end
    end

    #Set multiple configuration values.
    #
    #e.g.
    # config << {
    #   "/UI/Gtk/Font" => "Monospace 10",
    #   "/UI/Gtk/Color/Background" => "PapayaWhip"
    # }
    #
    #=== Arguments
    #_hash_ :: An instance of Hash that contains multiple pairs of
    #configuration key and value.
    def <<(hash)
      hash.each{ |key, val|
        self[key] = val
      }
    end
  end
end