first commit

.gitignore

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+*~

History.rdoc

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+=== 0.0.1 2012-04-13
+
+* 1 major enhancement:
+  * Initial release
+

LICENSE

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+(The MIT/X11 License)
+
+Copyright (c) 2012  Kenichi Kamiya
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Manifest.txt

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+README.rdoc
+LICENSE
+History.rdoc
+Manifest.txt
+Rakefile
+lib/flyweight.rb
+test/test_helper.rb
+test/test_flyweight.rb
+example/example.rb

README.rdoc

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+= Flyweight
+
+* http://github.com/kachick/flyweight
+* http://rubygems.org/gems/flyweight
+* http://rubyforge.org/projects/flyweight
+
+== Description
+
+A tiny template for the "Flyweight Pattern"
+
+== Usage
+
+* setup
+
+    require 'flyweight'
+
+* overview
+
+    class Material
+      include Flyweight
+
+      def initialize(looks, price)
+        @looks, @price = looks, price
+      end
+    end
+
+    a = Material.value :metal, 2000
+    b = Material.value :metal, 2000
+    c = Material.new   :metal, 2000
+    d = Material.value :paper, 50
+    a == b     #=> true
+    a.equal? b #=> true
+    a == c     #=> true
+    a.equal? c #=> false
+    a == d     #=> false
+    a.equal? d #=> false
+
+== Requirements
+
+* Ruby 1.9.2 or later
+
+  target release versions
+
+  * 1.9.3-p125
+  * 1.9.2-p290
+
+== Installation
+
+* gem install flyweight
+
+== License
+
+Copyright (C) 2012  Kenichi Kamiya
+
+The MIT/X11 License (See the file LICENSE)

Rakefile

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+gem 'hoe', '~> 3.0.1'
+require 'hoe'
+require 'fileutils'
+
+Hoe.plugin :newgem
+
+$hoe = Hoe.spec 'flyweight' do
+  developer 'Kenichi Kamiya', 'kachick1+ruby@gmail.com'
+  self.rubyforge_name       = name
+  require_ruby_version '>= 1.9.2'
+  dependency 'yard', '~> 0.7.5', :development
+end
+
+require 'newgem/tasks'
+Dir['tasks/**/*.rake'].each { |t| load t }

example/example.rb

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+#!/usr/local/bin/ruby -w
+
+$VERBOSE = true
+
+require_relative '../lib/flyweight'
+
+class Material
+  include Flyweight
+
+  def initialize(looks, price)
+    @looks, @price = looks, price
+  end
+end
+
+a = Material.value :metal, 2000
+b = Material.value :metal, 2000
+c = Material.new   :metal, 2000
+d = Material.value :paper, 50
+p a == b     #=> true
+p a.equal? b #=> true
+p a == c     #=> true
+p a.equal? c #=> false
+p a == d     #=> false
+p a.equal? d #=> false

lib/flyweight.rb

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+# flyweight
+#   A tiny template for the "Flyweight Pattern"
+
+# Copyright (C) 2012  Kenichi Kamiya
+
+# @example
+#   class Material
+#     include Flyweight
+#
+#     def initialize(looks, price)
+#       @looks, @price = looks, price
+#     end
+#   end
+#
+#   a = Material.value :metal, 2000
+#   b = Material.value :metal, 2000
+#   c = Material.new   :metal, 2000
+#   d = Material.value :paper, 50
+#   a == b     #=> true
+#   a.equal? b #=> true
+#   a == c     #=> true
+#   a.equal? c #=> false
+#   a == d     #=> false
+#   a.equal? d #=> false
+module Flyweight
+  VERSION = '0.0.1'.freeze
+
+  module Eigen
+    def value(*values)
+      pool = if singleton_class.const_defined? :FLYWEIGHT_POOL, false
+               singleton_class::FLYWEIGHT_POOL
+             else
+               singleton_class.const_set :FLYWEIGHT_POOL, {}
+             end
+
+      if pool.has_key? values
+        pool[values]
+      else
+        pool[values] = new(*values)
+      end
+    end
+  end
+
+  class << self
+    def included(mod)
+      raise ArgumentError unless mod.kind_of? ::Module
+
+      mod.extend Eigen
+     # mod.singleton_class.const_set :FLYWEIGHT_POOL, {}
+    end
+  end
+
+  def ==(other)
+    sources_for = ->obj{
+      obj.instance_variables.map{|var|obj.instance_variable_get var}
+    }
+
+    sources_for[self] == sources_for[other]
+  end
+end

test/test_flyweight.rb

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+$VERBOSE = true
+require_relative 'test_helper'
+
+class TestBasicCase < Test::Unit::TestCase
+  class Material
+    include Flyweight
+
+    def initialize(looks, price)
+      @looks, @price = looks, price
+    end
+  end
+
+  class SubMaterial < Material
+  end
+
+  def test_normaly
+    a = Material.value :metal, 2000
+    b = Material.value :metal, 2000
+    c = Material.new   :metal, 2000
+    d = Material.value :paper, 50
+    e = SubMaterial.value :metal, 2000
+    assert_equal b, a
+    assert_same b, a
+    assert_equal c, a
+    assert_same false, c.equal?(a)
+    assert_same false, c.__id__.equal?(a.__id__)
+    assert_same false, (d == a)
+    assert_same false, d.equal?(a) 
+    assert_same false, d.__id__.equal?(a.__id__)
+    assert_equal e, a
+    assert_same false, e.equal?(a)
+    assert_same false, e.__id__.equal?(a.__id__)
+  end
+end

test/test_helper.rb

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+require 'test/unit'
+require_relative '../lib/flyweight'