add MapIndexKey
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1 changed files with 123 additions and 0 deletions
123
src/index/map_key.rs
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123
src/index/map_key.rs
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pub use {
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std::{
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sync::{Arc, RwLock},
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boxed::Box
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},
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crate::{
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core::{
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View,
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Observer,
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ObserverExt,
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ObserverBroadcast,
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ViewPort,
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InnerViewPort,
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OuterViewPort
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},
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index::{IndexView}
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}
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};
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impl<SrcKey: 'static, Item: 'static + Default> OuterViewPort<dyn IndexView<SrcKey, Item = Item>> {
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pub fn map_key<
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DstKey: 'static,
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F1: Fn(&SrcKey) -> DstKey + Send + Sync + 'static,
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F2: Fn(&DstKey) -> Option<SrcKey> + Send + Sync + 'static,
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>(
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&self,
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f1: F1,
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f2: F2
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) -> OuterViewPort<dyn IndexView<DstKey, Item = Item>> {
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let port = ViewPort::new();
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let map = MapIndexKey::new(port.inner(), f1, f2);
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self.add_observer(map.clone());
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port.into_outer()
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}
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}
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pub struct MapIndexKey<DstKey, SrcKey, SrcView, F1, F2>
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where SrcView: IndexView<SrcKey> + ?Sized,
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F1: Fn(&SrcKey) -> DstKey + Send + Sync,
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F2: Fn(&DstKey) -> Option<SrcKey> + Send + Sync,
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{
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src_view: Option<Arc<SrcView>>,
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f1: F1,
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f2: F2,
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cast: Arc<RwLock<ObserverBroadcast<dyn IndexView<DstKey, Item = SrcView::Item>>>>
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}
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impl<DstKey, SrcKey, SrcView, F1, F2> MapIndexKey<DstKey, SrcKey, SrcView, F1, F2>
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where DstKey: 'static,
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SrcKey: 'static,
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SrcView: IndexView<SrcKey> + ?Sized + 'static,
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SrcView::Item: Default + 'static,
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F1: Fn(&SrcKey) -> DstKey + Send + Sync + 'static,
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F2: Fn(&DstKey) -> Option<SrcKey> + Send + Sync + 'static,
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{
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fn new(
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port: InnerViewPort<dyn IndexView<DstKey, Item = SrcView::Item>>,
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f1: F1,
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f2: F2
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) -> Arc<RwLock<Self>> {
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let map = Arc::new(RwLock::new(
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MapIndexKey {
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src_view: None,
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f1,
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f2,
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cast: port.get_broadcast()
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}
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));
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port.set_view(Some(map.clone()));
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map
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}
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}
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impl<DstKey, SrcKey, SrcView, F1, F2> View for MapIndexKey<DstKey, SrcKey, SrcView, F1, F2>
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where SrcView: IndexView<SrcKey> + ?Sized,
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F1: Fn(&SrcKey) -> DstKey + Send + Sync,
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F2: Fn(&DstKey) -> Option<SrcKey> + Send + Sync,
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{
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type Msg = DstKey;
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}
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impl<DstKey, SrcKey, SrcView, F1, F2> IndexView<DstKey> for MapIndexKey<DstKey, SrcKey, SrcView, F1, F2>
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where SrcView: IndexView<SrcKey> + ?Sized,
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SrcView::Item: Default,
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F1: Fn(&SrcKey) -> DstKey + Send + Sync,
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F2: Fn(&DstKey) -> Option<SrcKey> + Send + Sync,
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{
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type Item = SrcView::Item;
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fn get(&self, key: &DstKey) -> Self::Item {
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if let (Some(v), Some(k)) = (self.src_view.as_ref(), (self.f2)(key)) {
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v.get(&k)
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} else {
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Self::Item::default()
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}
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}
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fn area(&self) -> Option<Vec<DstKey>> {
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Some(self.src_view.as_ref()?.area()?.iter().map(&self.f1).collect())
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}
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}
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impl<DstKey, SrcKey, SrcView, F1, F2> Observer<SrcView> for MapIndexKey<DstKey, SrcKey, SrcView, F1, F2>
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where SrcView: IndexView<SrcKey> + ?Sized,
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SrcView::Item: Default,
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F1: Fn(&SrcKey) -> DstKey + Send + Sync,
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F2: Fn(&DstKey) -> Option<SrcKey> + Send + Sync,
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{
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fn reset(&mut self, view: Option<Arc<SrcView>>) {
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let old_area = self.area();
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self.src_view = view;
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let new_area = self.area();
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if let Some(area) = old_area { self.cast.notify_each(area); }
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if let Some(area) = new_area { self.cast.notify_each(area); }
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}
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fn notify(&self, msg: &SrcKey) {
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self.cast.notify(&(self.f1)(msg));
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}
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}
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