[ruby-dev:23567] PStoreを継承しやすく

西山和広です。

PStoreのdumpとloadだけを差し替えしやすくして、
YAML::StoreをPStoreの変更に影響されにくくする
というのはどうでしょうか?


Index: lib/pstore.rb
===================================================================
RCS file: /src/ruby/lib/pstore.rb,v
retrieving revision 1.17
diff -u -p -r1.17 pstore.rb
--- lib/pstore.rb	7 Jan 2003 07:36:39 -0000	1.17
+++ lib/pstore.rb	22 May 2004 19:53:50 -0000
@@ -98,9 +98,9 @@ class PStore
       end
       file.flock(read_only ? File::LOCK_SH : File::LOCK_EX)
       if read_only
-	@table = Marshal::load(file)
+	@table = load_file(file)
       elsif orig and (content = file.read) != ""
-	@table = Marshal::load(content)
+	@table = load(content)
 	size = content.size
 	md5 = Digest::MD5.digest(content)
 	content = nil		# unreference huge data
@@ -117,7 +117,7 @@ class PStore
       ensure
 	if !read_only and !@abort
 	  file.rewind
-	  content = Marshal::dump(@table)
+	  content = dump(@table)
 	  if !md5 || size != content.size || md5 != Digest::MD5.digest(content)
 	    File::copy @filename, backup
 	    begin
@@ -141,6 +141,18 @@ class PStore
       file.close if file
     end
     value
+  end
+
+  def dump(table)
+    Marshal::dump(table)
+  end
+
+  def load(content)
+    Marshal::load(content)
+  end
+
+  def load_file(file)
+    Marshal::load(file)
   end
 end
 


% cat lib/yaml/store.rb
#
# YAML::Store
#
require 'yaml'
require 'pstore'

module YAML

  class Store < PStore
    def initialize( *o )
      @opt = YAML::DEFAULTS.dup
      if String === o.first
        super(o.shift)
      end
      if o.last.is_a? Hash
        @opt.update(o.pop)
      end
    end

    def dump(table)
      @table.to_yaml(@opt)
    end

    def load(content)
      YAML::load(content)
    end

    def load_file(file)
      YAML::load(file)
    end
  end

end
%


-- 
|ZnZ(ゼット エヌ ゼット)
|西山和広(Kazuhiro NISHIYAMA)