Contents

#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.  The
# ASF licenses this file to you 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 Deltacloud::BackendCapability

  class Failure < StandardError
    attr_reader :capability

    def initialize(capability, msg='')
      super(msg)
      @capability = capability
    end
  end

  attr_reader :capability

  def with_capability(capability)
    @capability = capability
  end

  def has_capability?(backend)
    !capability or backend.has_capability?(capability)
  end

  def check_capability(backend)
    if !has_capability?(backend)
      raise Failure.new(capability, "#{capability} capability not supported by backend #{backend.class.name}")
    end
  end

  module Helpers
    def operations_for_collection(collection)
      collections[collection].operations.values.select { |op| op.has_capability?(driver) }
    end
  end

  helpers Helpers
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
deltacloud-core-0.5.0	lib/deltacloud/backend_capability.rb
deltacloud-core-0.4.1	lib/deltacloud/backend_capability.rb
deltacloud-core-0.4.0	lib/deltacloud/backend_capability.rb