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use std::{collections::VecDeque, sync::Arc};
use pandascore::{
endpoint::{CollectionOptions, ListResponse},
ClientTransport,
};
use crate::adapter::AdapterInner;
#[derive(Debug)]
pub struct PaginationIterator<C, T, F> {
adapter: Arc<AdapterInner<C>>,
results: VecDeque<T>,
next: Option<CollectionOptions>,
f: F,
}
impl<C, T, F> PaginationIterator<C, T, F>
where
C: ClientTransport,
F: Fn(Arc<AdapterInner<C>>, CollectionOptions) -> Option<ListResponse<T>>,
{
pub fn new(adapter: Arc<AdapterInner<C>>, next: CollectionOptions, f: F) -> Self {
Self {
adapter,
results: VecDeque::new(),
next: Some(next),
f,
}
}
}
impl<C, T, F> Iterator for PaginationIterator<C, T, F>
where
C: ClientTransport,
F: Fn(Arc<AdapterInner<C>>, CollectionOptions) -> Option<ListResponse<T>>,
{
type Item = T;
fn next(&mut self) -> Option<Self::Item> {
if let Some(next) = self.results.pop_front() {
return Some(next);
}
if let Some(next) = self.next.take() {
let mut response = (self.f)(Arc::clone(&self.adapter), next)?;
self.next = response.next.take();
self.results = response.results.into();
self.results.pop_front()
} else {
None
}
}
}
|
