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diff --git a/jni/ruby/lib/irb/output-method.rb b/jni/ruby/lib/irb/output-method.rb
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+++ b/jni/ruby/lib/irb/output-method.rb
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+#
+#   output-method.rb - output methods used by irb
+#   	$Release Version: 0.9.6$
+#   	$Revision: 47120 $
+#   	by Keiju ISHITSUKA(keiju@ruby-lang.org)
+#
+# --
+#
+#
+#
+
+require "e2mmap"
+
+module IRB
+  # An abstract output class for IO in irb. This is mainly used internally by
+  # IRB::Notifier. You can define your own output method to use with Irb.new,
+  # or Context.new
+  class OutputMethod
+    extend Exception2MessageMapper
+    def_exception :NotImplementedError, "Need to define `%s'"
+
+
+    # Open this method to implement your own output method, raises a
+    # NotImplementedError if you don't define #print in your own class.
+    def print(*opts)
+      OutputMethod.Raise NotImplementedError, "print"
+    end
+
+    # Prints the given +opts+, with a newline delimiter.
+    def printn(*opts)
+      print opts.join(" "), "\n"
+    end
+
+    # Extends IO#printf to format the given +opts+ for Kernel#sprintf using
+    # #parse_printf_format
+    def printf(format, *opts)
+      if /(%*)%I/ =~ format
+        format, opts = parse_printf_format(format, opts)
+      end
+      print sprintf(format, *opts)
+    end
+
+    # Returns an array of the given +format+ and +opts+ to be used by
+    # Kernel#sprintf, if there was a successful Regexp match in the given
+    # +format+ from #printf
+    #
+    #     %
+    #     <flag>  [#0- +]
+    #     <minimum field width> (\*|\*[1-9][0-9]*\$|[1-9][0-9]*)
+    #     <precision>.(\*|\*[1-9][0-9]*\$|[1-9][0-9]*|)?
+    #     #<length modifier>(hh|h|l|ll|L|q|j|z|t)
+    #     <conversion specifier>[diouxXeEfgGcsb%]
+    def parse_printf_format(format, opts)
+      return format, opts if $1.size % 2 == 1
+    end
+
+    # Calls #print on each element in the given +objs+, followed by a newline
+    # character.
+    def puts(*objs)
+      for obj in objs
+        print(*obj)
+        print "\n"
+      end
+    end
+
+    # Prints the given +objs+ calling Object#inspect on each.
+    #
+    # See #puts for more detail.
+    def pp(*objs)
+      puts(*objs.collect{|obj| obj.inspect})
+    end
+
+    # Prints the given +objs+ calling Object#inspect on each and appending the
+    # given +prefix+.
+    #
+    # See #puts for more detail.
+    def ppx(prefix, *objs)
+      puts(*objs.collect{|obj| prefix+obj.inspect})
+    end
+
+  end
+
+  # A standard output printer
+  class StdioOutputMethod<OutputMethod
+    # Prints the given +opts+ to standard output, see IO#print for more
+    # information.
+    def print(*opts)
+      STDOUT.print(*opts)
+    end
+  end
+end