Added /unloadchunks. Resolves #1779 (#674)

src/main/java/me/totalfreedom/totalfreedommod/command/Command_unloadchunks.java

@@ -0,0 +1,43 @@
+package me.totalfreedom.totalfreedommod.command;
+
+import me.totalfreedom.totalfreedommod.rank.Rank;
+import me.totalfreedom.totalfreedommod.util.FLog;
+import me.totalfreedom.totalfreedommod.util.FUtil;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.Chunk;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+
+@CommandPermissions(level = Rank.SUPER_ADMIN, source = SourceType.BOTH)
+@CommandParameters(description = "Unloads chunks not currently in use", usage = "/<command>", aliases = "rc")
+public class Command_unloadchunks extends FreedomCommand {
+
+    @Override
+    public boolean run(CommandSender sender, Player playerSender, Command cmd, String commandLabel, String[] args, boolean senderIsConsole) {
+        FUtil.adminAction(sender.getName(), "Unloading unused chunks", false);
+
+        int numChunks = 0;
+
+        for (World world : server.getWorlds()) {
+            numChunks += unloadUnusedChunks(world);
+        }
+
+        FUtil.playerMsg(sender, numChunks + " chunks unloaded.");
+        return true;
+    }
+
+    private int unloadUnusedChunks(World world) {
+        int numChunks = 0;
+
+        for (Chunk loadedChunk : world.getLoadedChunks()) {
+            if (!world.isChunkInUse(loadedChunk.getX(), loadedChunk.getZ())) {
+                if (world.unloadChunk(loadedChunk)) {
+                    numChunks++;
+                }
+            }
+        }
+
+        return numChunks;
+    }
+}