/// <summary>
/// Creates an instance of information about the body composition of the record owner
/// with specified time, measurement name, and value.
/// </summary>
///
/// <remarks>
/// Examples: % body fat, lean muscle mass.
/// </remarks>
///
/// <param name="when">
/// The date and time of the measurement.
/// </param>
///
/// <param name="measurementName">
/// The name of the measurement.
/// </param>
///
/// <param name="compositionValue">
/// The value of the measurement.
/// </param>
///
/// <exception cref="ArgumentNullException">
/// If <paramref name="when"/>, <paramref name="measurementName"/> or
/// <paramref name="compositionValue"/> is <b>null</b>.
/// </exception>
///
public BodyComposition(
ApproximateDateTime when,
CodableValue measurementName,
BodyCompositionValue compositionValue)
: base(TypeId)
{
When = when;
MeasurementName = measurementName;
Value = compositionValue;
}
/// <summary>
/// Populates this <see cref="BodyComposition"/> instance from the data in the XML.
/// </summary>
///
/// <param name="typeSpecificXml">
/// The XML to get the body composition data from.
/// </param>
///
/// <exception cref="InvalidOperationException">
/// If the first node in <paramref name="typeSpecificXml"/> is not
/// a "body-composition" node.
/// </exception>
///
protected override void ParseXml(IXPathNavigable typeSpecificXml)
{
XPathNavigator itemNav =
typeSpecificXml.CreateNavigator().SelectSingleNode("body-composition");
Validator.ThrowInvalidIfNull(itemNav, "BodyCompositionUnexpectedNode");
// when (approxi-date-time, mandatory)
_when = new ApproximateDateTime();
_when.ParseXml(itemNav.SelectSingleNode("when"));
// measurement-name (codable-value, mandatory)
_measurementName = new CodableValue();
_measurementName.ParseXml(itemNav.SelectSingleNode("measurement-name"));
// value (BodyCompositionValue, mandatory)
_value = new BodyCompositionValue();
_value.ParseXml(itemNav.SelectSingleNode("value"));
// measurement-method (codable value )
_measurementMethod =
XPathHelper.GetOptNavValue<CodableValue>(itemNav, "measurement-method");
// site
_site =
XPathHelper.GetOptNavValue<CodableValue>(itemNav, "site");
}