Class: Fit4Ruby::FitDataRecord

Inherits:
Object
  • Object
show all
Includes:
Converters
Defined in:
lib/fit4ruby/FitDataRecord.rb

Instance Method Summary collapse

Methods included from Converters

#conversion_factor, #fit_time_to_time, #secsToDHMS, #secsToHMS, #speedToPace, #time_to_fit_time

Constructor Details

#initialize(record_id) ⇒ FitDataRecord 



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# File 'lib/fit4ruby/FitDataRecord.rb', line 22

def initialize(record_id)
  @message = GlobalFitMessages.find_by_name(record_id)

  # Create instance variables that correspond to every field of the
  # corresponding FIT data record.
  @message.fields_by_name.each do |name, field|
    create_instance_variable(name)
  end
  # Meta fields are additional fields that are not part of the FIT
  # specification but are convenient to have. These are typcially
  # aggregated or converted values of regular fields.
  @meta_field_units = {}
  @timestamp = Time.now
end

Instance Method Details

#<=>(fdr) ⇒ Object 



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# File 'lib/fit4ruby/FitDataRecord.rb', line 93

def <=>(fdr)
  @timestamp <=> fdr.timestamp
end

#==(fdr) ⇒ Object 



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# File 'lib/fit4ruby/FitDataRecord.rb', line 76

def ==(fdr)
  @message.fields_by_name.each do |name, field|
    ivar_name = '@' + name
    v1 = field.fit_to_native(field.native_to_fit(
      instance_variable_get(ivar_name)))
    v2 = field.fit_to_native(field.native_to_fit(
      fdr.instance_variable_get(ivar_name)))

    unless v1 == v2
      Log.error "#{name}: #{v1} != #{v2}"
      return false
    end
  end

  true
end

#get(name) ⇒ Object 



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# File 'lib/fit4ruby/FitDataRecord.rb', line 53

def get(name)
  ivar_name = '@' + name
  return nil unless instance_variable_defined?(ivar_name)

  instance_variable_get(ivar_name)
end

#get_as(name, to_unit) ⇒ Object 



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# File 'lib/fit4ruby/FitDataRecord.rb', line 60

def get_as(name, to_unit)
  value = respond_to?(name) ? send(name) : get(name)
  return nil if value.nil?

  if @meta_field_units.include?(name)
    unit = @meta_field_units[name]
  else
    field = @message.fields_by_name[name]
    unless (unit = field.opts[:unit])
      Log.fatal "Field #{name} has no unit"
    end
  end

  value * conversion_factor(unit, to_unit)
end

#inspect ⇒ Object 



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# File 'lib/fit4ruby/FitDataRecord.rb', line 150

def inspect
  fields = {}
  @message.fields_by_name.each do |name, field|
    ivar_name = '@' + field.name
    fields[field.name] = instance_variable_get(ivar_name)
  end
  fields.inspect
end

#set(name, value) ⇒ Object 



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# File 'lib/fit4ruby/FitDataRecord.rb', line 43

def set(name, value)
  ivar_name = '@' + name
  unless instance_variable_defined?(ivar_name)
    Log.warn("Unknown FIT record field '#{name}' in global message " +
             "#{@message.name} (#{@message.number}).")
    return
  end
  instance_variable_set(ivar_name, value)
end

#set_field_values(field_values) ⇒ Object 



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# File 'lib/fit4ruby/FitDataRecord.rb', line 37

def set_field_values(field_values)
  field_values.each do |field, value|
    set(field.to_s, value)
  end
end

#write(io, id_mapper) ⇒ Object 



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# File 'lib/fit4ruby/FitDataRecord.rb', line 97

def write(io, id_mapper)
  # Construct a GlobalFitMessage object that matches exactly the provided
  # set of fields. It does not contain any AltField objects.
  fields = {}
  @message.fields_by_name.each_key do |name|
    fields[name] = instance_variable_get('@' + name)
  end
  global_fit_message = @message.construct(fields)

  # Map the global message number to the current local message number.
  unless (local_message_number = id_mapper.get_local(global_fit_message))
    # If the current dictionary does not contain the global message
    # number, we need to create a new entry for it. The index in the
    # dictionary is the local message number.
    local_message_number = id_mapper.add_global(global_fit_message)
    # Write the definition of the global message number to the file.
    global_fit_message.write(io, local_message_number)
  end

  # Write data record header.
  header = FitRecordHeader.new
  header.normal = 0
  header.message_type = 0
  header.local_message_type = local_message_number
  header.write(io)

  # Create a BinData::Struct object to store the data record.
  fields = []
  global_fit_message.fields_by_number.each do |field_number, field|
    bin_data_type = FitDefinitionField.fit_type_to_bin_data(field.type)
    fields << [ bin_data_type, field.name ]
  end
  bd = BinData::Struct.new(:endian => :little, :fields => fields)

  # Fill the BinData::Struct object with the values from the corresponding
  # instance variables.
  global_fit_message.fields_by_number.each do |field_number, field|
    iv = "@#{field.name}"
    if instance_variable_defined?(iv) &&
       !(iv_value = instance_variable_get(iv)).nil?
      value = field.native_to_fit(iv_value)
    else
      # If we don't have a corresponding variable or the variable is nil
      # we write the 'undefined' value instead.
      value = FitDefinitionField.undefined_value(field.type)
    end
    bd[field.name] = value
  end

  # Write the data record to the file.
  bd.write(io)
end