diff --git a/lib/twitter_cldr/shared/caser.rb b/lib/twitter_cldr/shared/caser.rb
new file mode 100644
index 000000000..3132eef3c
--- /dev/null
+++ b/lib/twitter_cldr/shared/caser.rb
@@ -0,0 +1,51 @@
+# encoding: UTF-8
+
+# Copyright 2012 Twitter, Inc
+# http://www.apache.org/licenses/LICENSE-2.0
+
+module TwitterCldr
+  module Shared
+    class Caser
+      REGEX = /./
+
+      class << self
+        def upcase(string)
+          string.gsub(REGEX, uppercasing_hash)
+        end
+
+        def downcase(string)
+          string.gsub(REGEX, lowercasing_hash)
+        end
+
+        def titlecase
+        end
+
+        private
+
+        def uppercasing_hash
+          @uppercasing_hash ||= Hash.new do |hash, key|
+            memoize_value(:simple_uppercase_map, hash, key)
+          end
+        end
+
+        def lowercasing_hash
+          @lowercasing_hash ||= Hash.new do |hash, key|
+            memoize_value(:simple_lowercase_map, hash, key)
+          end
+        end
+
+        def titlecasing_hash
+          @titlecasing_hash ||= Hash.new do |hash, key|
+            memoize_value(:simple_titlecase_map, hash, key)
+          end
+        end
+
+        def memoize_value(field, hash, key)
+          cp = TwitterCldr::Shared::CodePoint.get(key.ord)
+          mapped_result = cp.send(field)
+          hash[key] = mapped_result ? mapped_result : key
+        end
+      end
+    end
+  end
+end