Add JrJackson adapter

Gemfile

@@ -15,6 +15,7 @@ platforms :ruby, :mswin, :mingw do
 end
 platforms :jruby do
   gem 'gson', '>= 0.6', :require => nil
+  gem 'jrjackson', :require => nil
 end
 
 group :development do

lib/multi_json.rb

@@ -31,6 +31,7 @@ def default_options=(value)
     ['yajl',      :yajl],
     ['json',      :json_gem],
     ['gson',      :gson],
+    ['jrjackson', :jrjackson],
     ['json/pure', :json_pure]
   ]
 

lib/multi_json/adapters/jrjackson.rb

@@ -0,0 +1,20 @@
+require 'jrjackson_r' unless defined?(::JrJackson)
+require 'multi_json/adapters/ok_json'
+
+module MultiJson
+  module Adapters
+    class Jrjackson < MultiJson::Adapters::OkJson
+      ParseError = ::Java::OrgCodehausJackson::JsonParseException
+
+      def load(string, options={}) #:nodoc:
+        string = string.read if string.respond_to?(:read)
+        result = ::JrJackson::Json.parse(string)
+        options[:symbolize_keys] ? symbolize_keys(result) : result
+      end
+
+      def dump(object, options={}) #:nodoc:
+        ::JrJackson::Json.generate(prepare_object(object){ |value| value })
+      end
+    end
+  end
+end

spec/adapter_shared_example.rb

@@ -106,7 +106,7 @@ class << time
 
     # This behavior is currently not supported by gson.rb
     # See discussion at https://github.com/intridea/multi_json/pull/71
-    unless adapter == 'gson'
+    unless %w(gson jrjackson).include?(adapter)
       it 'dumps custom objects that implement to_json' do
         klass = Class.new do
           def to_json(*)

spec/multi_json_spec.rb

@@ -144,10 +144,11 @@
 
   it_behaves_like 'has options', MultiJson
 
-  %w(gson json_gem json_pure nsjsonserialization oj ok_json yajl).each do |adapter|
-    next if adapter == 'gson' && !jruby?
-    next if adapter == 'nsjsonserialization' && !macruby?
-    next if jruby? && (adapter == 'oj' || adapter == 'yajl')
+  %w(gson jrjackson json_gem json_pure nsjsonserialization oj ok_json yajl).each do |adapter|
+    next if !jruby? && %w(gson jrjackson).include?(adapter)
+    next if !macruby? && adapter == 'nsjsonserialization'
+    next if jruby? && %w(oj yajl).include?(adapter)
+
     context adapter do
       it_behaves_like 'an adapter', adapter
     end