Class: Fit4Ruby::FitDataRecord

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

Constant Summary collapse

RecordOrder = 
[ 'user_data', 'user_profile',
'device_info', 'data_sources', 'event',
'record', 'lap', 'length', 'session', 'heart_rate_zones',
'personal_records' ]

Constants included from BDFieldNameTranslator

BDFieldNameTranslator::BD_DICT

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from BDFieldNameTranslator

#to_bd_field_name

Methods included from Converters

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

Constructor Details

#initialize(record_id) ⇒ FitDataRecord

Returns a new instance of FitDataRecord.



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# File 'lib/fit4ruby/FitDataRecord.rb', line 31

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 Attribute Details

#message ⇒ Object (readonly)

Returns the value of attribute message.



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# File 'lib/fit4ruby/FitDataRecord.rb', line 29

def message
  @message
end

#timestamp ⇒ Object (readonly)

Returns the value of attribute timestamp.



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# File 'lib/fit4ruby/FitDataRecord.rb', line 29

def timestamp
  @timestamp
end

Instance Method Details

#<=>(fdr) ⇒ Object 



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# File 'lib/fit4ruby/FitDataRecord.rb', line 103

def <=>(fdr)
  @timestamp == fdr.timestamp ?
    RecordOrder.index(@message.name) <=>
    RecordOrder.index(fdr.message.name) :
    @timestamp <=> fdr.timestamp
end

#==(fdr) ⇒ Object 



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# File 'lib/fit4ruby/FitDataRecord.rb', line 88

def ==(fdr)
  @message.each_field(field_values_as_hash) do |number, field|
    ivar_name = '@' + field.name
    # Comparison of values is done in the fit file format as the accuracy
    # of native formats is better and could lead to wrong results if a
    # value hasn't been read back from a fit file yet.
    v1 = field.native_to_fit(instance_variable_get(ivar_name))
    v2 = field.native_to_fit(fdr.instance_variable_get(ivar_name))

    return false unless v1 == v2
  end

  true
end

#export ⇒ Object 



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# File 'lib/fit4ruby/FitDataRecord.rb', line 178

def export
  message = {
    'message' => @message.name,
    'number' => @message.number,
    'fields' => {}
  }

  @message.each_field(field_values_as_hash) do |number, field|
    ivar_name = '@' + field.name
    fit_value = field.native_to_fit(instance_variable_get(ivar_name))
    unless field.is_undefined?(fit_value)
      fld = {
        'number' => number,
        'value' => field.fit_to_native(fit_value),
        #'human' => field.to_human(fit_value),
        'type' => field.type
      }
      fld['unit'] = field.opts[:unit] if field.opts[:unit]
      fld['scale'] = field.opts[:scale] if field.opts[:scale]

      message['fields'][field.name] = fld
    end
  end

  message
end

#get(name) ⇒ Object 



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# File 'lib/fit4ruby/FitDataRecord.rb', line 63

def get(name)
  # This is a request for a native FIT field.
  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 71

def get_as(name, to_unit)
  value = respond_to?(name) ? send(name) : get(name)
  return nil if value.nil?
  # If the requested unit is empty we return the value as is.
  return value if to_unit.nil? || to_unit.empty?

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

  value * conversion_factor(unit, to_unit)
end

#get_unit_by_name(name) ⇒ Object 



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# File 'lib/fit4ruby/FitDataRecord.rb', line 205

def get_unit_by_name(name)
  field = @message.fields_by_name[name]
  field.opts[:unit]
end

#set(name, value) ⇒ Object 



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

def set(name, value)
  ivar_name = '@' + name
  unless instance_variable_defined?(ivar_name)
    Log.debug("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 47

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 110

def write(io, id_mapper)
  global_fit_message = @message.construct(
    field_values = field_values_as_hash)

  # 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 = []
  values = {}

  # Fill the BinData::Struct object with the values from the corresponding
  # instance variables.
  global_fit_message.each_field(field_values) do |number, field|
    bin_data_type = FitDefinitionFieldBase.fit_type_to_bin_data(field.type)
    field_name = to_bd_field_name(field.name)
    field_def = [ bin_data_type, field_name ]

    iv = "@#{field.name}"
    if instance_variable_defined?(iv) &&
       !(iv_value = instance_variable_get(iv)).nil?
      values[field.name] = 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 = FitDefinitionFieldBase.undefined_value(field.type)
      values[field.name] = field.opts[:array] ? [ value ] :
        field.type == 'string' ? '' : value
    end

    # Some field types need special handling.
    if field.type == 'string'
      # Zero terminate the string.
      values[field.name] += "\0"
    elsif field.opts[:array]
      # For Arrays we use a BinData::Array to write them.
      field_def = [ :array, field_name,
                    { :type => bin_data_type,
                      :initial_length => values[field.name].size } ]
    end
    fields << field_def
  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.each_field(field_values) do |number, field|
    bd[to_bd_field_name(field.name)] = values[field.name]
  end

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