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#--
# Copyright (c) 2005 Robert Aman
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#++
require 'feed_tools'
module FeedTools
# Generic methods needed in numerous places throughout FeedTools
module GenericHelper
# Raises an exception if an invalid option has been specified to prevent
# misspellings from slipping through
def self.validate_options(valid_option_keys, supplied_option_keys)
unknown_option_keys = supplied_option_keys - valid_option_keys
unless unknown_option_keys.empty?
raise "Unknown options: #{unknown_option_keys}"
end
end
# Nifty little method that takes a block and returns nil if recursion
# occurs or the block's result value if it doesn't.
def self.recursion_trap(lock_object, &block)
if @lock_ids.nil?
@lock_ids = []
end
if !@lock_ids.include?(lock_object.object_id)
@lock_ids << lock_object.object_id
else
return nil
end
begin
result = block.call
rescue SystemStackError
result = nil
end
@lock_ids.delete(lock_object.object_id)
return result
end
end
end
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