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use crate::elevation::{error::Error, request::Request}; // crate::elevation
impl<'a> Request<'a> {
/// Builds the query string for the Google Maps Elevation API based on the
/// input provided by the client.
///
/// ## Arguments
///
/// This method accepts no arguments.
pub fn build(&mut self) -> Result<&'a mut Request, Error> {
// Ensure request has been validated before building the query string:
if !self.validated {
return Err(Error::RequestNotValidated);
}
// This section builds the "required parameters" portion of the query
// string:
let mut query = String::from("key=");
query.push_str(&self.client.key);
// This section builds the "positional request" portion of the query
// string:
// Locations key/value pair:
if let Some(locations) = &self.locations {
query.push_str("&locations=");
query.push_str(&String::from(locations));
} // if
// This section builds the "sampled path request" portion of the query
// string:
// Path key/value pair:
if let Some(path) = &self.path {
query.push_str("&path=");
query.push_str(&String::from(path));
} // if
// Samples key/value pair:
if let Some(samples) = &self.samples {
query.push_str("&samples=");
query.push_str(&samples.to_string());
} // if
// Set query string in Request struct.
self.query = Some(query);
// Return modified Request struct to caller.
Ok(self)
} // fn
} // impl