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module Groonga
module ExpressionRewriters
@rewriters = {}
class << self
def register(name, rewriter_class)
@rewriters[name] = rewriter_class
end
def enabled?
rewriters_table_name =
Config["expression_rewriter.table"] || "expression_rewriters"
rewriters_table = Context.instance[rewriters_table_name]
return false if rewriters_table.nil?
return false if rewriters_table.empty?
true
end
def classes
rewriters_table_name =
Config["expression_rewriter.table"] || "expression_rewriters"
rewriters_table = Context.instance[rewriters_table_name]
return [] if rewriters_table.nil?
rewriters_table.collect do |id|
record = Record.new(rewriters_table, id)
name = record.key
rewriter = @rewriters[name]
if rewriter.nil?
plugin_name = record.plugin_name.value
require plugin_name
rewriter = @rewriters[name]
raise "unknown rewriter: <#{name}>:<#{plugin_name}>" if rewriter.nil?
end
rewriter
end
end
end
end
end
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