Fix Recursive zipping example

- Minor refactoring
- Rubify Java-ish code
- Fix issue with `::Zip` reference
- Add test to ensure integrity

samples/example_recursive.rb

@@ -7,42 +7,52 @@ require 'zip'
 #
 # Usage:
 #   directoryToZip = "/tmp/input"
-#   outputFile = "/tmp/out.zip"
-#   zf = ZipFileGenerator.new(directoryToZip, outputFile)
+#   output_file = "/tmp/out.zip"
+#   zf = ZipFileGenerator.new(directory_to_zip, output_file)
 #   zf.write()
 class ZipFileGenerator
 
   # Initialize with the directory to zip and the location of the output archive.
-  def initialize(inputDir, outputFile)
-    @inputDir = inputDir
-    @outputFile = outputFile
+  def initialize(input_dir, output_file)
+    @input_dir = input_dir
+    @output_file = output_file
   end
 
   # Zip the input directory.
-  def write()
-    entries = Dir.entries(@inputDir); entries.delete("."); entries.delete("..")
-    io = Zip::File.open(@outputFile, Zip::File::CREATE);
+  def write
+    entries = Dir.entries(@input_dir) - %w(. ..)
 
-    writeEntries(entries, "", io)
-    io.close();
+    ::Zip::File.open(@output_file, ::Zip::File::CREATE) do |io|
+      write_entries entries, '', io
+    end
   end
 
+  private
+
   # A helper method to make the recursion work.
-  private
-  def writeEntries(entries, path, io)
+  def write_entries(entries, path, io)
+    entries.each do |e|
+      zip_file_path = path == '' ? e : File.join(path, e)
+      disk_file_path = File.join(@input_dir, zip_file_path)
+      puts "Deflating #{disk_file_path}"
 
-    entries.each { |e|
-      zipFilePath = path == "" ? e : File.join(path, e)
-      diskFilePath = File.join(@inputDir, zipFilePath)
-      puts "Deflating " + diskFilePath
-      if  File.directory?(diskFilePath)
-        io.mkdir(zipFilePath)
-        subdir =Dir.entries(diskFilePath); subdir.delete("."); subdir.delete("..")
-        writeEntries(subdir, zipFilePath, io)
+      if File.directory? disk_file_path
+        recursively_deflate_directory(disk_file_path, io, zip_file_path)
       else
-        io.get_output_stream(zipFilePath) { |f| f.puts(File.open(diskFilePath, "rb").read())}
+        put_into_archive(disk_file_path, io, zip_file_path)
       end
-    }
+    end
   end
 
-end
+  def recursively_deflate_directory(disk_file_path, io, zip_file_path)
+    io.mkdir zip_file_path
+    subdir = Dir.entries(disk_file_path) - %w(. ..)
+    write_entries subdir, zip_file_path, io
+  end
+
+  def put_into_archive(disk_file_path, io, zip_file_path)
+    io.get_output_stream(zip_file_path) do |f|
+      f.puts(File.open(disk_file_path, 'rb').read)
+    end
+  end
+end

test/samples/example_recursive_test.rb

@@ -0,0 +1,37 @@
+require 'test_helper'
+require 'fileutils'
+require_relative '../../samples/example_recursive'
+
+class ExampleRecursiveTest < MiniTest::Test
+  DIRECTORY_TO_ZIP  = 'test/data/globTest'
+  OUTPUT_DIRECTORY  = 'test/data/example_recursive.zip'
+  TEMP_DIRECTORY    = 'test/data/tmp'
+
+  def setup
+    @generator = ::ZipFileGenerator.new(DIRECTORY_TO_ZIP, OUTPUT_DIRECTORY)
+  end
+
+  def teardown
+    FileUtils.rm_rf TEMP_DIRECTORY
+    FileUtils.rm_f  OUTPUT_DIRECTORY
+  end
+
+  def test_write
+    @generator.write
+    unzip
+    assert_equal Dir.entries(DIRECTORY_TO_ZIP).sort, Dir.entries(TEMP_DIRECTORY).sort
+  end
+
+  private
+
+  def unzip(file = OUTPUT_DIRECTORY)
+    Zip::File.open(file) do |zip_file|
+      zip_file.each do |f|
+        file_path = File.join(TEMP_DIRECTORY, f.name)
+        FileUtils.mkdir_p(File.dirname(file_path))
+
+        zip_file.extract(f, file_path) unless File.exist?(file_path)
+      end
+    end
+  end
+end