What an event!

src/org/bukkit/event/Event.java

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+
+package org.bukkit.event;
+
+import org.bukkit.Server;
+
+/**
+ * Represents an event
+ */
+public abstract class Event {
+    private final Server server;
+
+    protected Event(final Server instance) {
+        server = instance;
+    }
+
+    public final Server getServer() {
+        return server;
+    }
+}

src/org/bukkit/event/player/PlayerEvent.java

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+
+package org.bukkit.event.player;
+
+import org.bukkit.Player;
+import org.bukkit.Server;
+import org.bukkit.event.Event;
+
+/**
+ * Represents a player related event
+ */
+public abstract class PlayerEvent extends Event {
+    private final Player player;
+
+    protected PlayerEvent(final Server server, final Player who) {
+        super(server);
+        player = who;
+    }
+
+    public final Player getPlayer() {
+        return player;
+    }
+}

src/org/bukkit/event/player/PlayerJoinEvent.java

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+
+package org.bukkit.event.player;
+
+import org.bukkit.Player;
+import org.bukkit.Server;
+
+/**
+ * Handles all event arguments in relation to a player joining a server
+ */
+public class PlayerJoinEvent extends PlayerEvent {
+    public PlayerJoinEvent(final Server server, final Player player) {
+        super(server, player);
+    }
+}

src/org/bukkit/event/player/PlayerListener.java

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+
+package org.bukkit.event.player;
+
+/**
+ * Handles all events thrown in relation to a Player
+ */
+public abstract class PlayerListener {
+    private PlayerListener() {
+    }
+
+    public abstract void onPlayerJoin(PlayerJoinEvent event);
+    public abstract void onPlayerQuit(PlayerQuitEvent event);
+}

src/org/bukkit/event/player/PlayerQuitEvent.java

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+
+package org.bukkit.event.player;
+
+import org.bukkit.Player;
+import org.bukkit.Server;
+
+/**
+ * Handles all event arguments in relation to a player joining a server
+ */
+public class PlayerQuitEvent extends PlayerEvent {
+    private final PlayerQuitReason reason;
+
+    public PlayerQuitEvent(final Server server, final Player player, final PlayerQuitReason because) {
+        super(server, player);
+        reason = because;
+    }
+
+    /**
+     * Return the reason for a player quitting the game
+     * @return PlayerQuitReason with the relevant reason
+     */
+    public PlayerQuitReason getReason() {
+        return reason;
+    }
+
+    /**
+     * The reason a player quit the game
+     */
+    public enum PlayerQuitReason {
+        /**
+         * A player willingly quit the game
+         */
+        Quit,
+
+        /**
+         * A player disconnected due to a technical fault
+         */
+        Disconnected,
+        
+        /**
+         * A player was kicked by another player
+         */
+        Kicked
+    }
+}