Struct TimelineItemDiffMinimizer

struct TimelineItemDiffMinimizer<'a, S, I> {
    store: &'a S,
    item_map: HashMap<String, I>,
    updated_item_ids: Vec<String>,
}

A helper struct to minimize a list of VectorDiff.

This does not support VectorDiff::Clear, VectorDiff::Truncate and VectorDiff::Reset as we assume that lists including those cannot be minimized in an optimal way.

Fields

store: &'a S

item_map: HashMap<String, I>

updated_item_ids: Vec<String>

Implementations

impl<'a, S, I> TimelineItemDiffMinimizer<'a, S, I>

fn new(store: &'a S) -> Self

Construct a TimelineItemDiffMinimizer with the given store.

impl<S, I> TimelineItemDiffMinimizer<'_, S, I>

where S: TimelineItemStore<Item = I>, I: IsA<TimelineItem>,

fn load_items(&mut self) -> Vec<String>

Load the items from the store.

Returns the list of timeline IDs of the items.

fn update_or_create_item(&mut self, data: &S::Data) -> String

Update or create an item in the store using the given data.

Returns the timeline ID of the item.

fn apply_diff_to_items( &mut self, item_ids: &[String], diff_list: Vec<VectorDiff<S::Data>>, ) -> Vec<String>

Apply the given diff to the given items.

fn item_diff_list( &self, old_item_ids: &[String], new_item_ids: &[String], ) -> Vec<TimelineItemDiff<S::Item>>

Compute the list of item diffs between the two given lists.

Uses a diff algorithm to minimize the removals and additions.

fn apply(self, diff_list: Vec<VectorDiff<S::Data>>)

Minimize the given diff and apply it to the store.