Class: Hamsterdam::Struct

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

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(values = Hamsterdam.hash, validate = true) ⇒ Struct

Returns a new instance of Struct.



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# File 'lib/hamsterdam.rb', line 116

def initialize(values=Hamsterdam.hash, validate=true)
  if validate
    @data = flesh_out(ensure_expected_hash(values))
    validate_keys(@data)
  else
    @data = values
  end
end

Class Method Details

.define(*field_names) ⇒ Object 



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# File 'lib/hamsterdam.rb', line 77

def self.define(*field_names)
  struct_class = Class.new(Hamsterdam::Struct) do
    field_names = field_names.map &:to_sym
    field_names.each do |fname|
      define_method fname do 
        @data[fname]
      end

      define_method "set_#{fname}" do |value|
        if @data[fname] == value
          self
        else
          self.class.new(@data.put(fname, value), false)
        end
      end
    end
  end

  struct_class.instance_variable_set(:@field_names, Hamsterdam.set(*field_names))
  struct_class.instance_variable_set(:@field_names_list, Hamsterdam.list(*field_names))
  class << struct_class 
    def field_names
      if !@field_names.nil?
        @field_names
      else
        superclass.field_names
      end
    end
    def field_names_list
      if !@field_names_list.nil?
        @field_names_list
      else
        superclass.field_names_list
      end
    end
  end
  struct_class
end

.safe_create(values = Hamsterdam.hash) ⇒ Object 



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# File 'lib/hamsterdam.rb', line 125

def self.safe_create(values=Hamsterdam.hash)
  h = field_names.inject(Hamsterdam.hash) do |memo, field_name|
    if values.has_key?(field_name)
      memo.put(field_name, values[field_name])
    elsif values.has_key?(field_name.to_s)
      memo.put(field_name.to_s, values[field_name.to_s])
    else
      memo
    end
  end
  new(h)
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/hamsterdam.rb', line 142

def ==(other)
  !other.nil? &&
    other.respond_to?(:internal_hash) &&
    internal_hash == other.internal_hash
end

#eql?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hamsterdam.rb', line 148

def eql?(other)
  self.class == other.class && self == other
end

#hash ⇒ Object 



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# File 'lib/hamsterdam.rb', line 152

def hash
  @data.hash
end

#inspect ⇒ Object 



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# File 'lib/hamsterdam.rb', line 161

def inspect
  to_s
end

#internal_hash ⇒ Object Also known as: to_hamster_hash 



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# File 'lib/hamsterdam.rb', line 156

def internal_hash
  @data
end

#merge(values) ⇒ Object 



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# File 'lib/hamsterdam.rb', line 138

def merge(values)
  self.class.new(@data.merge(ensure_expected_hash(values)))
end

#to_s ⇒ Object 



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# File 'lib/hamsterdam.rb', line 165

def to_s
  name = self.class.name ? self.class.name.split(/::/).last : self.class.to_s
  data = internal_hash
  fields = self.class.field_names_list.map { |fname| "#{fname}: #{data[fname].inspect}" }
  "<#{([name]+fields).join(" ")}>"
end