Class: MultiGzReader

Inherits:
Object
  • Object
show all
Defined in:
lib/scbi_multi_gz_reader/multi_gz_reader.rb

Instance Method Summary collapse

Constructor Details

#initialize(file_name) ⇒ MultiGzReader

Returns a new instance of MultiGzReader.



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# File 'lib/scbi_multi_gz_reader/multi_gz_reader.rb', line 5

def initialize(file_name)
	@file_name=file_name

	@file = File.open(@file_name)
	@io = Zlib::GzipReader.new @file
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/scbi_multi_gz_reader/multi_gz_reader.rb', line 52

def close
	#@io.finish
	@file.close
end

#eof ⇒ Object 



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# File 'lib/scbi_multi_gz_reader/multi_gz_reader.rb', line 48

def eof
	eof?
end

#eof? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scbi_multi_gz_reader/multi_gz_reader.rb', line 43

def eof?
	#nothing more to read
	@io.unused.nil? && (@io.closed? || @io.eof?) && (@file.closed? || @file.eof?)
end

#readline ⇒ Object 



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# File 'lib/scbi_multi_gz_reader/multi_gz_reader.rb', line 12

def readline

	res=nil

	begin
		res=@io.readline
	rescue EOFError => e

		#reached END, check if there is more data to read
		unused = @io.unused

		@io.finish

		# there is something left to read, open another stream
		if !unused.nil?
			#puts "FIN1, fpos: #{@file.pos}, unused: #{unused.length}, io_eof: #{@io.eof}, eof: #{@file.eof}"
		
			@file.pos -= unused.length
			@io = Zlib::GzipReader.new @file
			#repeat the read so there is no eof error
			res=readline

		else
			#no more data to read, return nil
			res=nil
		end
	end

	return res
end

#rewind ⇒ Object 



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# File 'lib/scbi_multi_gz_reader/multi_gz_reader.rb', line 57

def rewind
	close
	@file = File.open(@file_name)
	@io = Zlib::GzipReader.new @file
end