Now preventing placement/use of these items inside another faction's territory: redstone wire, signs, flint&steel, beds (not detected properly by Bukkit yet), buckets (empty, water, and lava), repeaters

src/com/bukkit/mcteam/factions/Factions.java

@@ -37,6 +37,7 @@ public class Factions extends JavaPlugin {
 		PluginManager pm = this.getServer().getPluginManager();
 		pm.registerEvent(Event.Type.PLAYER_CHAT, this.playerListener, Event.Priority.Highest, this);
 		pm.registerEvent(Event.Type.PLAYER_COMMAND_PREPROCESS, this.playerListener, Event.Priority.Normal, this);
+		pm.registerEvent(Event.Type.PLAYER_ITEM, this.playerListener, Event.Priority.Normal, this);
 		pm.registerEvent(Event.Type.PLAYER_JOIN, this.playerListener, Event.Priority.Normal, this);
 		pm.registerEvent(Event.Type.PLAYER_MOVE, this.playerListener, Event.Priority.Normal, this);
 		pm.registerEvent(Event.Type.PLAYER_QUIT, this.playerListener, Event.Priority.Normal, this);

src/com/bukkit/mcteam/factions/listeners/FactionsPlayerListener.java

@@ -3,9 +3,11 @@ package com.bukkit.mcteam.factions.listeners;
 import java.util.*;
 import java.util.logging.Logger;
 
+import org.bukkit.block.Block;
 import org.bukkit.entity.*;
 import org.bukkit.event.player.PlayerChatEvent;
 import org.bukkit.event.player.PlayerEvent;
+import org.bukkit.event.player.PlayerItemEvent;
 import org.bukkit.event.player.PlayerListener;
 import org.bukkit.event.player.PlayerMoveEvent;
 
@@ -146,5 +148,46 @@ public class FactionsPlayerListener extends PlayerListener{
 		}
 	}
 
+    @Override
+    public void onPlayerItem(PlayerItemEvent event) {
+		if (event.isCancelled())
+			return;
+
+		if (!this.playerCanUseItemHere(event.getPlayer(), event.getBlockClicked(), event.getItem().getTypeId()))
+		{
+			event.setCancelled(true);
+			return;
+		}
 
 	}
+
+	//currently checking placement/use of: redstone, sign, flint&steel, beds (not detected properly by Bukkit yet), buckets (empty, water, lava), repeater
+	private static Set<Integer> badItems = new HashSet(Arrays.asList(
+		 new Integer[] {331, 323, 259, 355, 325, 326, 327, 356}
+	));
+
+	public boolean playerCanUseItemHere(Player player, Block block, int itemId) {
+
+		if (!badItems.contains(new Integer(itemId))) {
+			return true; // Item isn't one we're preventing.
+		}
+
+		Coord coord = Coord.parseCoord(block);
+		Faction otherFaction = Board.get(player.getWorld()).getFactionAt(coord);
+
+		if (otherFaction == null || otherFaction.id == 0) {
+			return true; // This is not faction territory. Use whatever you like here.
+		}
+
+		Follower me = Follower.get(player);
+		Faction myFaction = me.getFaction();
+
+		// Cancel if we are not in our own territory
+		if (myFaction != otherFaction) {
+			me.sendMessage(Conf.colorSystem+"You can't use that in the territory of "+otherFaction.getTag(myFaction));
+			return false;
+		}
+
+		return true;
+	}
+}