Class: Tdms::StringChannelEnumerator

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/tdms/channel.rb

Instance Method Summary collapse

Constructor Details

#initialize(channel) ⇒ StringChannelEnumerator

Returns a new instance of StringChannelEnumerator.



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# File 'lib/tdms/channel.rb', line 57

def initialize(channel)
  @channel = channel

  @index_pos = @channel.raw_data_pos
  @data_pos  = @index_pos + (4 * @channel.num_values)
end

Instance Method Details

#[](i) ⇒ Object 



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# File 'lib/tdms/channel.rb', line 86

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/tdms/channel.rb', line 68

def each
  data_pos = @data_pos

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

    @channel.file.seek index_pos
    next_data_pos = @data_pos + @channel.file.read_u32

    length = next_data_pos - data_pos

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

    data_pos = next_data_pos
  end
end

#size ⇒ Object 



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# File 'lib/tdms/channel.rb', line 64

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