Add AutoStartTimer to repo >_>

src/com/garbagemule/MobArena/autostart/AutoStartTimer.java

@@ -0,0 +1,98 @@
+package com.garbagemule.MobArena.autostart;
+
+import com.garbagemule.MobArena.Messenger;
+import com.garbagemule.MobArena.Msg;
+import com.garbagemule.MobArena.framework.Arena;
+
+public class AutoStartTimer {
+    private Arena arena;
+    private int seconds;
+    private Timer timer;
+    private boolean started;
+    
+    public AutoStartTimer(Arena arena, int seconds) {
+        this.arena     = arena;
+        this.seconds   = seconds;
+        this.started   = false;
+    }
+    
+    /**
+     * Starts the timer.
+     * The method is idempotent, meaning if the timer was already
+     * started, nothing happens if the method is called again.
+     */
+    public void start() {
+        if (seconds > 5 && !started) {
+            timer = new Timer(seconds);
+            timer.start();
+            started = true;
+        }
+    }
+    
+    public boolean isRunning() {
+        return (timer != null && started);
+    }
+    
+    public int getRemaining() {
+        return (timer != null ? timer.getRemaining() : -1);
+    }
+    
+    /**
+     * The internal timer class used for the auto-join-timer setting.
+     * Using an extra internal object allows the interruption of a current
+     * timer, followed by the creation of a new. Thus, no timers should
+     * ever interfere with each other.
+     */
+    private class Timer implements Runnable {
+        private int remaining;
+        
+        private Timer(int seconds) {
+            this.remaining   = seconds;
+        }
+        
+        /**
+         * Start the timer
+         */
+        public synchronized void start() {
+            arena.scheduleTask(this, 20);
+        }
+        
+        /**
+         * Get the remaining number of seconds
+         * @return number of seconds left
+         */
+        public synchronized int getRemaining() {
+            return remaining;
+        }
+    
+        @Override
+        public void run() {
+            synchronized(this) {
+                // Abort if the arena is running, or if players have left
+                if (arena.isRunning() || arena.getPlayersInLobby().isEmpty()) {
+                    started = false;
+                    this.notifyAll();
+                    return;
+                }
+                
+                // Count down
+                remaining--;
+                
+                // Start if 0
+                if (remaining <= 0) {
+                    arena.forceStart();
+                    started = false;
+                } else {                    
+                    // Warn at 5 seconds left
+                    if (remaining == 5) {
+                        Messenger.tellAll(arena, Msg.ARENA_AUTO_START, "5");
+                    }
+                    
+                    // Reschedule
+                    arena.scheduleTask(this, 20);
+                }
+                this.notifyAll();
+            }
+        }
+    }
+}