Class: RubyTDMS::StringChannelEnumerator

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/ruby_tdms/string_channel_enumerator.rb

Instance Method Summary collapse

Constructor Details

#initialize(channel) ⇒ StringChannelEnumerator

Returns a new instance of StringChannelEnumerator.



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# File 'lib/ruby_tdms/string_channel_enumerator.rb', line 6

def initialize(channel)
	@channel = channel

	@index_offset = @channel.raw_data_offset
	@data_offset = @index_offset + (4 * @channel.value_count)
end

Instance Method Details

#[](i) ⇒ Object 



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# File 'lib/ruby_tdms/string_channel_enumerator.rb', line 38

def [](i)
	if (i < 0) || (i >= size)
		raise RangeError, 'Channel %s has a range of 0 to %d, got invalid index: %d' % [@channel.path, size - 1, i]
	end

	inject(0) do |j, value|
		return value if j == i
		j += 1
	end
end

#each ⇒ Object 



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# File 'lib/ruby_tdms/string_channel_enumerator.rb', line 19

def each
	data_pos = @data_offset

	0.upto(size - 1) do |i|
		index_pos = @index_offset + (4 * i)

		@channel.stream.seek index_pos
		next_data_pos = @data_offset + @channel.stream.read_u32

		length = next_data_pos - data_pos

		@channel.stream.seek data_pos
		yield @channel.stream.read(length)

		data_pos = next_data_pos
	end
end

#size ⇒ Object 



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# File 'lib/ruby_tdms/string_channel_enumerator.rb', line 14

def size
	@size ||= @channel.value_count
end