Class: RubyTDMS::ChannelEnumerator

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

Instance Method Summary collapse

Constructor Details

#initialize(channel) ⇒ ChannelEnumerator 



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

def initialize(channel)
  @channel = channel
end

Instance Method Details

#[](i) ⇒ Object 



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# File 'lib/ruby_tdms/channel_enumerator.rb', line 21

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

  chunk_index = i / @channel.chunk_value_count

  offset = (@channel.raw_data_offset + (@channel.chunk_length * chunk_index)) + (i * @channel.value_offset)
  @channel.stream.seek offset
  @channel.data_type.read_from_stream(@channel.stream, @channel.segment.big_endian?).value
end

#each ⇒ Object 



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# File 'lib/ruby_tdms/channel_enumerator.rb', line 16

def each
  0.upto(size - 1) { |i| yield self[i] }
end

#size ⇒ Object 



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# File 'lib/ruby_tdms/channel_enumerator.rb', line 11

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