Class: ConfigNewton::Configuration

Inherits:
Object
  • Object
show all
Defined in:
lib/config_newton.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Configuration

Returns a new instance of Configuration.



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# File 'lib/config_newton.rb', line 54

def initialize
  @hash = {}
  @properties = []
  @defaults = {}
end

Instance Attribute Details

#properties ⇒ Object (readonly)

Returns the value of attribute properties.



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# File 'lib/config_newton.rb', line 60

def properties
  @properties
end

Instance Method Details

#[](property) ⇒ Object

Read an individual property on the configuration.



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# File 'lib/config_newton.rb', line 85

def [](property)
  @hash[property.to_sym] || @defaults[property.to_sym]
end

#[]=(property, value) ⇒ Object

Set an individual property on the configuration.



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# File 'lib/config_newton.rb', line 90

def []=(property, value)
  @hash[property.to_sym] = value
end

#add(name, options = {}) ⇒ Object Also known as: property

Add a new property that can be set and read on this configuration.

Options:

:default

Specify a default value.

Raises:

  • (ArgumentError) 


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# File 'lib/config_newton.rb', line 68

def add(name, options = {})
  raise ArgumentError, "Property name cannot be blank." unless name && name != ""
  @properties << name.to_sym
  @defaults[name.to_sym] = options[:default] if options[:default]
  self.class.class_eval <<-RUBY
    def #{name}
      self[:#{name}]
    end
    
    def #{name}=(value)
      self[:#{name}] = value
    end
  RUBY
end

#load(yaml_string, root_node = nil) ⇒ Object

Load configuration from a YAML string. Provide a root node if you want something other than the entire yaml document to be utilized. For example, in Rails, you might provide the Rails environment as a root node.



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# File 'lib/config_newton.rb', line 124

def load(yaml_string, root_node = nil)
  hash = YAML::load(yaml_string)
  set(root_node ? hash[root_node] : hash)
end

#load_from(file_or_path, root_node = 'configuration') ⇒ Object

Load configuration from a YAML file specified by the path given (or a file pointer). Provide a root node if you want something other than the entire yaml document to be utilized. For example, in Rails, you might provide the Rails environment as a root node.



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# File 'lib/config_newton.rb', line 135

def load_from(file_or_path, root_node = 'configuration')
  hash = YAML::load_file(file_or_path)
  set(root_node ? hash[root_node] : hash)
end

#set(properties = {}, &block) ⇒ Object

Set the properties of the configuration either by providing a hash or by providing a block. The block will yield a configuration object that has method setters and getters.

Example:

MyClass.config.set do |config|
  config.property = 123
end



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# File 'lib/config_newton.rb', line 110

def set(properties = {}, &block)
  if block_given?
    yield self
  else
    @hash.merge!(properties.inject({}){|h,(k,v)| h[k.to_sym] = v; h})
  end
  self
end

#to_hash ⇒ Object

Converts the configuration into a symbol-keyed hash.



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# File 'lib/config_newton.rb', line 96

def to_hash
  @defaults.merge(@hash)
end