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94 lines
2.3 KiB
94 lines
2.3 KiB
use page::Page;
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use entities::{
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account::Account,
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notification::Notification,
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relationship::Relationship,
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report::Report,
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status::{Emoji, Status}
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};
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use serde::Deserialize;
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macro_rules! into_pageiter {
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($typ:ty) => {
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impl<'a> IntoIterator for Page<'a, $typ> {
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type Item = $typ;
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type IntoIter = PageIter<'a, $typ>;
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fn into_iter(self) -> PageIter<'a, $typ> {
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PageIter::new(self)
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}
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}
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}
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}
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into_pageiter!(Status);
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into_pageiter!(Account);
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into_pageiter!(String);
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into_pageiter!(Emoji);
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into_pageiter!(Notification);
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into_pageiter!(Report);
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into_pageiter!(Relationship);
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pub struct PageIter<'a, T: Clone + for<'de> Deserialize<'de>> {
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page: Page<'a, T>,
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buffer: Vec<T>,
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cur_idx: usize,
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use_initial: bool,
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}
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impl<'a, T: Clone + for<'de> Deserialize<'de>> PageIter<'a, T> {
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fn new(page: Page<'a, T>) -> PageIter<'a, T> {
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PageIter {
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page: page,
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buffer: vec![],
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cur_idx: 0,
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use_initial: true,
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}
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}
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fn need_next_page(&self) -> bool {
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self.buffer.is_empty() ||
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self.cur_idx == self.buffer.len()
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}
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fn fill_next_page(&mut self) -> Option<()> {
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let items = if let Ok(items) = self.page.next_page() {
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items
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} else {
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return None;
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};
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if let Some(items) = items {
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self.buffer = items;
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self.cur_idx = 0;
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Some(())
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} else {
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None
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}
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}
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}
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impl<'a, T: Clone+ for<'de> Deserialize<'de>> Iterator for PageIter<'a, T> {
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type Item = T;
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fn next(&mut self) -> Option<Self::Item> {
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if self.use_initial {
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let idx = self.cur_idx;
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if self.cur_idx == self.page.initial_items.len() - 1 {
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self.cur_idx = 0;
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self.use_initial = false;
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} else {
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self.cur_idx += 1;
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}
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Some(self.page.initial_items[idx].clone())
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} else {
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if self.need_next_page() {
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if self.fill_next_page().is_none() {
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return None;
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}
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}
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let idx = self.cur_idx;
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self.cur_idx += 1;
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Some(self.buffer[idx].clone())
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}
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}
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}
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