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use crate::elevation::Error;
// -----------------------------------------------------------------------------
impl crate::traits::Validatable for crate::elevation::Request<'_> {
/// Ensures that the request is valid.
///
/// This function checks the combination of parameters to ensure that they
/// make sense together and that Google Maps API will accept them.
///
/// For example, Google Maps will not allow both a Positional Request and a
/// Sampled Path Request in the same query.
///
/// This function does not check parameter values for validity - i.e. it
/// will not ensure Polylines or Latitudes/Longitudes are valid and
/// well-formed.
///
/// ## Arguments
///
/// This method accepts no arguments.
///
/// # Errors
///
/// * This will fail if the request `struct` fails validation. For example,
/// parameters in the request conflict with one another, or the request
/// parameters are set in a way that's incompatible.
///
/// For example, Google Maps Directions API cannot calculate alternative
/// routes if waypoints have been set. This will cause a validation
/// failure.
fn validate(&self) -> Result<(), crate::Error> {
// If a "for positional request" has been set...
if let Some(_locations) = &self.locations {
// ...a "for sampled path request" cannot be set.
if let Some(_path) = &self.path {
return Err(Error::EitherPositionalOrSampledPath)?;
} // if
} // if
// If we made it to the bottom, all tests have passed. Return `Ok` to
// caller:
Ok(())
} // fn
} // impl