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begin
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  require 'tokyocabinet'
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rescue LoadError
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  puts "You need the tokyocabinet gem to use Anemone::Storage::TokyoCabinet"
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  exit
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end
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require 'forwardable'
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module Anemone
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  module Storage
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    class TokyoCabinet
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      extend Forwardable
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      def_delegators :@db, :close, :size, :keys, :has_key?
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      def initialize(file)
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        raise "TokyoCabinet filename must have .tch extension" if File.extname(file) != '.tch'
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        @db = ::TokyoCabinet::HDB::new
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        @db.open(file, ::TokyoCabinet::HDB::OWRITER | ::TokyoCabinet::HDB::OCREAT)
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        @db.clear
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      end
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      def [](key)
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        if value = @db[key]
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          load_value(value)
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        end
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      end
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      def []=(key, value)
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        @db[key] = [Marshal.dump(value)].pack("m")
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      end
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      def delete(key)
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        value = self[key]
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        @db.delete(key)
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        value
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      end
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      def each
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        @db.each { |k, v| yield k, load_value(v) }
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      end
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      def merge!(hash)
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        hash.each { |key, value| self[key] = value }
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        self
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      end
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      private
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      def load_value(value)
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        Marshal.load(value.unpack("m")[0])
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      end
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    end
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  end
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end
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