Add documentation in RDoc format.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4458 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/cgi/session/pstore.rb

@@ -1,3 +1,14 @@
+#
+# cgi/session/pstore.rb - persistent storage of marshalled session data
+#
+# Documentation: William Webber (william@williamwebber.com)
+# 
+# == Overview
+#
+# This file provides the CGI::Session::PStore class, which builds
+# persistent of session data on top of the pstore library.  See
+# cgi/session.rb for more details on session storage managers.
+
 require 'cgi/session'
 require 'pstore'
 
@@ -14,11 +25,38 @@ class CGI
       @data[key] = val
     end
 
+    # PStore-based session storage class.
+    #
+    # This builds upon the top-level PStore class provided by the
+    # library file pstore.rb.  Session data is marshalled and stored
+    # in a file.  File locking and transaction services are provided.
     class PStore
-      def check_id(id)
+      def check_id(id) #:nodoc:
 	/[^0-9a-zA-Z]/ =~ id.to_s ? false : true
       end
 
+      # Create a new CGI::Session::PStore instance
+      #
+      # This constructor is used internally by CGI::Session.  The
+      # user does not generally need to call it directly.
+      #
+      # +session+ is the session for which this instance is being
+      # created.  The session id must only contain alphanumeric
+      # characters; automatically generated session ids observe
+      # this requirement.
+      # 
+      # +option+ is a hash of options for the initialiser.  The
+      # following options are recognised:
+      #
+      # tmpdir:: the directory to use for storing the PStore
+      #          file.  Defaults to Dir::tmpdir (generally "/tmp"
+      #          on Unix systems).
+      # prefix:: the prefix to add to the session id when generating
+      #          the filename for this session's PStore file.
+      #          Defaults to the empty string.
+      #
+      # This session's PStore file will be created if it does
+      # not exist, or opened if it does.
       def initialize session, option={}
 	dir = option['tmpdir'] || ENV['TMP'] || '/tmp'
 	prefix = option['prefix'] || ''
@@ -34,6 +72,9 @@ class CGI
 	@p = ::PStore.new path 
       end
 
+      # Restore session state from the session's PStore file.
+      #
+      # Returns the session state as a hash.
       def restore
 	unless @hash
 	  @p.transaction do
@@ -47,16 +88,19 @@ class CGI
 	@hash
       end
 
+      # Save session state to the session's PStore file.
       def update 
 	@p.transaction do
 	    @p['hash'] = @hash
 	end
       end
 
+      # Update and close the session's PStore file.
       def close
 	update
       end
 
+      # Close and delete the session's PStore file.
       def delete
 	path = @p.path
 	File::unlink path
@@ -67,6 +111,7 @@ class CGI
 end
 
 if $0 == __FILE__
+  # :enddoc:
   STDIN.reopen("/dev/null")
   cgi = CGI.new
   session = CGI::Session.new cgi, 'database_manager' => CGI::Session::PStore