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morizyun · Dec 9, 2012 · f93a45a · f93a45a
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diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,5 @@
+./data*
+file*
+./chap*
+./chap15/*
+chap15/*
diff --git a/01_template_method_sample.rb b/01_template_method_sample.rb
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+class Report
+  def initialize
+    @title = "html report title"
+    @text = ["report line 1", "report line 2", "report line 3"]
+  end
+
+  def output_report
+    output_start
+    output_body
+    output_end
+  end
+
+  def output_start
+  end
+
+  def output_body
+    @text.each do |line|
+      output_line(line)
+    end
+  end
+
+  def output_line(line)
+    raise 'Called abstract method !!'
+  end
+
+  def output_end
+  end
+end
+
+class HTMLReport < Report
+  def output_start
+    puts "<html><head><title>#{@title}</title></head><body>"
+  end
+
+  def output_line(line)
+    puts "<p>#{line}</p>"
+  end
+
+  def output_end
+    puts '</body></html>'
+  end
+end
+
+class PlaneTextReport < Report
+  def output_start
+    puts "**** #{@title} ****"
+  end
+
+  def output_line(line)
+    puts line
+  end
+end
+
+# ===========================================
+html_report = HTMLReport.new
+html_report.output_report
+#<html><head><title>html report title</title></head><body>
+#<p>report line 1</p>
+#<p>report line 2</p>
+#<p>report line 3</p>
+#</body></html>
+
+plane_text_report = PlaneTextReport.new
+plane_text_report.output_report
+#**** html report title ****
+#report line 1
+#report line 2
+#report line 3
diff --git a/02_strategy_sample1.rb b/02_strategy_sample1.rb
@@ -0,0 +1,51 @@
+class Report
+  attr_reader :title, :text
+  attr_accessor :formatter
+
+  def initialize(formatter)
+    @title = 'report title'
+    @text = %w(text1 text2 text3)
+    @formatter = formatter
+  end
+
+  def output_report
+    @formatter.output_report(self)
+  end
+end
+
+class Formatter
+  def output_report(title, text)
+    raise 'Called abstract method !!'
+  end
+end
+
+class HTMLFormatter < Formatter
+  def output_report(report)
+    puts "<html><head><title>#{report.title}</title></head><body>"
+    report.text.each { |line| puts "<p>#{line}</p>" }
+    puts '</body></html>'
+  end
+end
+
+class PlaneTextFormatter < Formatter
+  def output_report(report)
+    puts "***** #{report.title} *****"
+    report.text.each { |line| puts(line) }
+  end
+end
+
+# ===========================================
+report = Report.new(HTMLFormatter.new)
+report.output_report
+#<html><head><title>report title</title></head><body>
+#<p>text1</p>
+#<p>text2</p>
+#<p>text3</p>
+#</body></html>
+
+report.formatter = PlaneTextFormatter.new
+report.output_report
+#***** report title *****
+#text1
+#text2
+#text3
diff --git a/02_strategy_sample2.rb b/02_strategy_sample2.rb
@@ -0,0 +1,41 @@
+class Report
+  attr_reader :title, :text
+  attr_accessor :formatter
+
+  def initialize(&formatter)
+    @title = 'report title'
+    @text = %w(text1 text2 text3)
+    @formatter = formatter
+  end
+
+  def output_report
+    @formatter.call(self)
+  end
+end
+
+HTML_FORMATTER = lambda do |context|
+  puts "<html><head><title>#{context.title}</title></head><body>"
+  context.text.each { |line| puts "<p>#{line}</p>" }
+  puts '</body></html>'
+end
+
+PLANE_TEXT_FORMATTER = lambda do |context|
+  puts "***** #{context.title} *****"
+  context.text.each { |line| puts(line) }
+end
+
+# ===========================================
+report = Report.new(&HTML_FORMATTER)
+report.output_report
+#<html><head><title>report title</title></head><body>
+#<p>text1</p>
+#<p>text2</p>
+#<p>text3</p>
+#</body></html>
+
+report.formatter = PLANE_TEXT_FORMATTER
+report.output_report
+#***** report title *****
+#text1
+#text2
+#text3
diff --git a/03_observer_sample.rb b/03_observer_sample.rb
@@ -0,0 +1,42 @@
+# -*- coding: utf-8 -*-
+require 'observer'
+class Employee
+  include Observable
+
+  attr_reader :name, :address, :salary
+
+  def initialize(name, title, salary)
+    @title = name
+    @title = title
+    @salary = salary
+    add_observer(Payroll.new)
+    add_observer(TaxMan.new)
+  end
+
+  def salary=(new_salary)
+    @salary = new_salary
+    changed
+    notify_observers(self)
+  end
+end
+
+class Payroll
+  def update(changed_employee)
+    puts "彼の給料は#{changed_employee.salary}になりました！#{changed_employee.title}のために新しい小切手を切ります。"
+  end
+end
+
+class TaxMan
+  def update(changed_employee)
+    puts "#{changed_employee.title}に新しい税金の請求書を送ります"
+  end
+end
+
+# ===========================================
+john = Employee.new('John', 'Senior Vice President', 5000)
+john.salary = 6000
+john.salary = 7000
+#彼の給料は6000になりました！Johnのために新しい小切手を切ります。
+#Johnに新しい税金の請求書を送ります
+#彼の給料は7000になりました！Johnのために新しい小切手を切ります。
+#Johnに新しい税金の請求書を送ります
diff --git a/04_composite_sample.rb b/04_composite_sample.rb
@@ -0,0 +1,78 @@
+# -*- coding: utf-8 -*-
+
+# Component
+class Entry
+  def get_name; end
+
+  def ls_entry(prefix) end
+
+  def remove; end
+end
+
+# Leaf (中身)
+class FileEntry < Entry
+  def initialize(name)
+    @title = name
+  end
+
+  def get_name
+    @title
+  end
+
+  def ls_entry(prefix)
+    puts(prefix + "/" + get_name)
+  end
+
+  def remove
+    puts @title + "を削除しました"
+  end
+end
+
+# Composite
+class DirEntry < Entry
+  def initialize(name)
+    @title = name
+    @directory = Array.new
+  end
+
+  def get_name
+    @title
+  end
+
+  def add(entry)
+    @directory.push(entry)
+  end
+
+  def ls_entry(prefix)
+    puts(prefix + "/" + get_name)
+    @directory.each do |e|
+      e.ls_entry(prefix + "/" + @title)
+    end
+  end
+
+  def remove
+    @directory.each do |i|
+      i.remove
+    end
+    puts @title + "を削除しました"
+  end
+end
+
+# ===========================================
+root = DirEntry.new("root")
+tmp = DirEntry.new("tmp")
+tmp.add(FileEntry.new("conf"))
+tmp.add(FileEntry.new("data"))
+root.add(tmp)
+
+root.ls_entry("")
+
+root.remove
+#/root
+#/root/tmp
+#/root/tmp/conf
+#/root/tmp/data
+#confを削除しました
+#dataを削除しました
+#tmpを削除しました
+#rootを削除しました
diff --git a/05_iterator_sample1.rb b/05_iterator_sample1.rb
@@ -0,0 +1,68 @@
+# -*- coding: utf-8 -*-
+
+# 集約オブジェクト中の要素
+class Article
+  def initialize(title)
+    @title = title
+  end
+
+  attr_reader :title
+end
+
+# 集約オブジェクト
+class Blog
+  def initialize
+    @articles = []
+  end
+
+  def get_article_at(index)
+    @articles[index]
+  end
+
+  def add_article(article)
+    @articles << article
+  end
+
+  def length
+    @articles.length
+  end
+
+  def iterator
+    BlogIterator.new(self)
+  end
+end
+
+# 外部イーテレータ
+class BlogIterator
+  def initialize(blog)
+    @blog = blog
+    @index = 0
+  end
+
+  def has_next?
+    @index < @blog.length
+  end
+
+  def next_article
+    article = self.has_next? ? @blog.get_article_at(@index) : nil
+    @index = @index + 1
+    article
+  end
+end
+
+# ===========================================
+blog = Blog.new
+blog.add_article(Article.new("デザインパターン1"))
+blog.add_article(Article.new("デザインパターン2"))
+blog.add_article(Article.new("デザインパターン3"))
+blog.add_article(Article.new("デザインパターン4"))
+
+iterator = blog.iterator
+while iterator.has_next?
+  article = iterator.next_article
+  puts article.title
+end
+#デザインパターン1
+#デザインパターン2
+#デザインパターン3
+#デザインパターン4