Add PowerLevelsEvent.

src/room/power_levels.rs

@@ -1 +1,59 @@
 //! Types for the *m.room.power_levels* event.
+
+use std::collections::HashMap;
+
+use core::{Event, EventType, RoomEvent, StateEvent};
+
+/// Defines the power levels (privileges) of users in the room.
+pub struct PowerLevelsEvent<'a, 'b> {
+    content: PowerLevelsEventContent<'a>,
+    event_id: &'a str,
+    prev_content: Option<PowerLevelsEventContent<'b>>,
+    room_id: &'a str,
+    user_id: &'a str,
+}
+
+impl<'a, 'b> Event<'a, PowerLevelsEventContent<'a>> for PowerLevelsEvent<'a, 'b> {
+    fn content(&'a self) -> &'a PowerLevelsEventContent<'a> {
+        &self.content
+    }
+
+    fn event_type(&self) -> EventType {
+        EventType::RoomPowerLevels
+    }
+}
+
+impl<'a, 'b> RoomEvent<'a, PowerLevelsEventContent<'a>> for PowerLevelsEvent<'a, 'b> {
+    fn event_id(&'a self) -> &'a str {
+        &self.event_id
+    }
+
+    fn room_id(&'a self) -> &'a str {
+        &self.room_id
+    }
+
+    fn user_id(&'a self) -> &'a str {
+        &self.user_id
+    }
+}
+
+impl<'a, 'b> StateEvent<'a, 'b, PowerLevelsEventContent<'a>> for PowerLevelsEvent<'a, 'b> {
+    fn prev_content(&'a self) -> Option<&'b PowerLevelsEventContent> {
+        match self.prev_content {
+            Some(ref prev_content) => Some(prev_content),
+            None => None,
+        }
+    }
+}
+
+/// The payload of a `PowerLevelsEvent`.
+pub struct PowerLevelsEventContent<'a> {
+    ban: u64,
+    events: &'a HashMap<&'a str, u64>,
+    events_default: u64,
+    kick: u64,
+    redact: u64,
+    state_default: u64,
+    users: &'a HashMap<&'a str, u64>,
+    users_default: u64,
+}