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# Copyright 2011-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file 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 AWS
class EC2
# Represents an EC2 tag.
# @attr [String] value The tag value.
class Tag < Resource
# @param [String] key The name of the tag
# @param [Hash] options
# @option options [String] :value ('') The optional value of the tag.
def initialize resource, key, options = {}
@resource = resource
@key = key.to_s
super
end
# @return [Object] The EC2 resource this tag belongs to.
attr_reader :resource
# @return [String] The name of this tag.
attr_reader :key
alias_method :name, :key
attribute :value
populates_from(:describe_tags) do |resp|
resp.tag_index[response_index_key]
end
# Deletes this tag.
# @return [nil]
def delete(value = nil)
tag_opts = { :key => key }
tag_opts[:value] = value if value
client.delete_tags(:resources => [resource.id], :tags => [tag_opts])
nil
end
# @api private
def inspect
"<#{self.class}:#{local_cache_key}>"
end
# @api private
def local_cache_key
response_index_key
end
private
def response_index_key
type = resource.tagging_resource_type
id = resource.send(:__resource_id__)
"#{type}:#{id}:#{key}"
end
protected
def get_resource attr
client.describe_tags(:filters => [
{ :name => "key", :values => [key] },
{ :name => "resource-type", :values => [resource.tagging_resource_type] },
{ :name => "resource-id", :values => [resource.send(:__resource_id__)] }
])
end
end
end
end
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