Class: Xail::FilterRegistry

Inherits:
Object
  • Object
show all
Defined in:
lib/xail/filter.rb

Class Method Summary collapse

Class Method Details

.filters ⇒ Object 



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# File 'lib/xail/filter.rb', line 13

def self.filters
  @@filters ||= FilterRegistry.find_filters
end

.find_filters ⇒ Object

naively assume all filters are defined in this file, or at least loaded before this executes



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# File 'lib/xail/filter.rb', line 20

def self.find_filters
  filters = Hash.new
  ObjectSpace.each_object(Class).select { |classObject|
    classObject < AbstractFilter and
    not classObject.name.downcase.include? "abstract"
  }.map { |filterclass|
    filtername = filterclass.name.split('::').last.gsub(/filter/i, '')
    filters[filtername.downcase] = filterclass
  }

  filters
end

.get_filter(key) ⇒ Object 



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# File 'lib/xail/filter.rb', line 33

def self.get_filter(key)
  name = key.to_s

  @@filters ||= FilterRegistry.filters

  if @@filters.has_key? name
    return @@filters[name]
  end

  # if we couldn't find the filter, rebuild the list and try
  # again
  @@filters = FilterRegistry.find_filters

  if @@filters.has_key? name
    return @@filters[name]
  else
    raise UnknownFilter.new(name)
  end
end