#
# Author:: Adam Edwards (<adamed@getchef.com>)
# Copyright:: Copyright 2014 Chef Software, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
module WmiLite
  class Wmi
    class Instance

      attr_reader :wmi_ole_object

      def initialize(wmi_ole_object)
        @wmi_ole_object = wmi_ole_object
        @property_map = self.class.wmi_ole_object_to_hash(wmi_ole_object)
      end

      def [](key)
        @property_map[key]
      end

      private

      def self.wmi_ole_object_to_hash(wmi_object)
        property_map = {}
        wmi_object.properties_.each do |property|
          property_map[property.name.downcase] = wmi_object.invoke(property.name)
        end

        @wmi_ole_object = wmi_object

        property_map.freeze
      end

    end
  end
end

#
# Author:: Adam Edwards (<adamed@getchef.com>)
# Copyright:: Copyright 2014 Chef Software, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
module WmiLite
  class Wmi
    class Instance

      attr_reader :wmi_ole_object

      def initialize(wmi_ole_object)
        @wmi_ole_object = wmi_ole_object
        @property_map = wmi_ole_object_to_hash(wmi_ole_object)
      end

      def [](key)
        @property_map[key]
      end

      private

      def wmi_ole_object_to_hash(wmi_object)
        property_map = {}
        wmi_object.properties_.each do |property|
          property_map[property.name.downcase] = wmi_object.invoke(property.name)
        end

        @wmi_ole_object = wmi_object

        property_map.freeze
      end

    end
  end
end

Make awkward class method an instance method
Make awkward class method an instance method
