Support for experience as trading goods on signs. This will not work until experience is fixed in Bukkit.

Essentials/src/com/earth2me/essentials/IUser.java

@@ -64,4 +64,8 @@ public interface IUser
 	Teleport getTeleport();
 
 	void setJail(String jail);
+
+	public int getTotalExperience();
+
+	public void setTotalExperience(int l);
 }

Essentials/src/com/earth2me/essentials/Trade.java

@@ -20,28 +20,35 @@ public class Trade
 	private final transient String command;
 	private final transient Double money;
 	private final transient ItemStack itemStack;
+	private final transient Integer exp;
 	private final transient IEssentials ess;
 
 	public Trade(final String command, final IEssentials ess)
 	{
-		this(command, null, null, ess);
+		this(command, null, null, null, ess);
 	}
 
 	public Trade(final double money, final IEssentials ess)
 	{
-		this(null, money, null, ess);
+		this(null, money, null, null, ess);
 	}
 
 	public Trade(final ItemStack items, final IEssentials ess)
 	{
-		this(null, null, items, ess);
+		this(null, null, items, null, ess);
+	}
+	
+	public Trade(final int exp, final IEssentials ess)
+	{
+		this(null, null, null, exp, ess);
 	}
 
-	private Trade(final String command, final Double money, final ItemStack item, final IEssentials ess)
+	private Trade(final String command, final Double money, final ItemStack item, final Integer exp, final IEssentials ess)
 	{
 		this.command = command;
 		this.money = money;
 		this.itemStack = item;
+		this.exp = exp;
 		this.ess = ess;
 	}
 
@@ -71,6 +78,11 @@ public class Trade
 		{
 			throw new ChargeException(_("notEnoughMoney"));
 		}
+		
+		if (exp != null && exp > 0 
+			&& user.getTotalExperience() < exp) {
+			throw new ChargeException(_("notEnoughExperience"));
+		}
 	}
 
 	public void pay(final IUser user)
@@ -101,6 +113,10 @@ public class Trade
 			}
 			user.updateInventory();
 		}
+		if (getExperience() != null)
+		{
+			user.setTotalExperience(user.getTotalExperience() + getExperience());
+		}
 		return success;
 	}
 
@@ -136,6 +152,15 @@ public class Trade
 			}
 			user.takeMoney(cost);
 		}
+		if (getExperience() != null)
+		{
+			final int experience = user.getTotalExperience();
+			if (experience < getExperience() && getExperience() > 0)
+			{
+				throw new ChargeException(_("notEnoughExperience"));
+			}
+			user.setTotalExperience(experience - getExperience());
+		}
 	}
 
 	public Double getMoney()
@@ -147,6 +172,11 @@ public class Trade
 	{
 		return itemStack;
 	}
+	
+	public Integer getExperience()
+	{
+		return exp;
+	}
 	private static FileWriter fw = null;
 
 	public static void log(String type, String subtype, String event, String sender, Trade charge, String receiver, Trade pay, Location loc, IEssentials ess)
@@ -193,6 +223,12 @@ public class Trade
 				sb.append("money").append(",");
 				sb.append(ess.getSettings().getCurrencySymbol());
 			}
+			if (charge.getExperience() != null)
+			{
+				sb.append(charge.getExperience()).append(",");
+				sb.append("exp").append(",");
+				sb.append("\"\"");
+			}
 		}
 		sb.append(",\"");
 		if (receiver != null)
@@ -218,6 +254,12 @@ public class Trade
 				sb.append("money").append(",");
 				sb.append(ess.getSettings().getCurrencySymbol());
 			}
+			if (pay.getExperience() != null)
+			{
+				sb.append(pay.getExperience()).append(",");
+				sb.append("exp").append(",");
+				sb.append("\"\"");
+			}
 		}
 		if (loc == null)
 		{

Essentials/src/com/earth2me/essentials/signs/EssentialsSign.java

@@ -399,6 +399,11 @@ public class EssentialsSign
 				sign.setLine(index, (quantity - decrement) + " times");
 				return new Trade(signName.toLowerCase(Locale.ENGLISH) + "sign", ess);
 			}
+			else if (item.equalsIgnoreCase("exp") || item.equalsIgnoreCase("xp"))
+			{
+				sign.setLine(index, quantity + " exp");
+				return new Trade(quantity, ess);
+			}
 			else
 			{
 				final ItemStack stack = getItemStack(item, quantity, ess);

Essentials/src/com/earth2me/essentials/signs/SignTrade.java

@@ -160,8 +160,13 @@ public class SignTrade extends EssentialsSign
 		if (split.length == 2 && !amountNeeded)
 		{
 			final int amount = getIntegerPositive(split[0]);
-			final ItemStack item = getItemStack(split[1], amount, ess);
+
-			if (amount < 1 || item.getTypeId() == 0)
+			if (amount < 1)
+			{
+				throw new SignException(_("moreThanZero"));
+			}
+			if (!(split[1].equalsIgnoreCase("exp") || split[1].equalsIgnoreCase("xp"))
+				&& getItemStack(split[1], amount, ess).getTypeId() == 0)
 			{
 				throw new SignException(_("moreThanZero"));
 			}
@@ -177,10 +182,14 @@ public class SignTrade extends EssentialsSign
 		if (split.length == 3 && amountNeeded)
 		{
 			final int stackamount = getIntegerPositive(split[0]);
-			final ItemStack item = getItemStack(split[1], stackamount, ess);
 			int amount = getIntegerPositive(split[2]);
 			amount -= amount % stackamount;
-			if (amount < 1 || stackamount < 1 || item.getTypeId() == 0)
+			if (amount < 1 || stackamount < 1)
+			{
+				throw new SignException(_("moreThanZero"));
+			}
+			if (!(split[1].equalsIgnoreCase("exp") || split[1].equalsIgnoreCase("xp"))
+				&& getItemStack(split[1], stackamount, ess).getTypeId() == 0)
 			{
 				throw new SignException(_("moreThanZero"));
 			}
@@ -218,16 +227,30 @@ public class SignTrade extends EssentialsSign
 
 		if (split.length == 3)
 		{
-			final int stackamount = getIntegerPositive(split[0]);
+			if (split[1].equalsIgnoreCase("exp") || split[1].equalsIgnoreCase("xp"))
-			final ItemStack item = getItemStack(split[1], stackamount, ess);
-			int amount = getInteger(split[2]);
-			amount -= amount % stackamount;
-			if (notEmpty && (amount < 1 || stackamount < 1 || item.getTypeId() == 0))
 			{
-				throw new SignException(_("tradeSignEmpty"));
+				final int stackamount = getIntegerPositive(split[0]);
+				int amount = getInteger(split[2]);
+				amount -= amount % stackamount;
+				if (notEmpty && (amount < 1 || stackamount < 1))
+				{
+					throw new SignException(_("tradeSignEmpty"));
+				}
+				return new Trade(fullAmount ? amount : stackamount, ess);
+			}
+			else
+			{
+				final int stackamount = getIntegerPositive(split[0]);
+				final ItemStack item = getItemStack(split[1], stackamount, ess);
+				int amount = getInteger(split[2]);
+				amount -= amount % stackamount;
+				if (notEmpty && (amount < 1 || stackamount < 1 || item.getTypeId() == 0))
+				{
+					throw new SignException(_("tradeSignEmpty"));
+				}
+				item.setAmount(fullAmount ? amount : stackamount);
+				return new Trade(item, ess);
 			}
-			item.setAmount(fullAmount ? amount : stackamount);
-			return new Trade(item, ess);
 		}
 		throw new SignException(_("invalidSignLine", index + 1));
 	}
@@ -287,17 +310,32 @@ public class SignTrade extends EssentialsSign
 
 		if (split.length == 3)
 		{
-			final int stackamount = getIntegerPositive(split[0]);
+			if (split[1].equalsIgnoreCase("exp") || split[1].equalsIgnoreCase("xp"))
-			//TODO: Unused local variable
-			final ItemStack item = getItemStack(split[1], stackamount, ess);
-			final int amount = getInteger(split[2]);
-			final String newline = stackamount + " " + split[1] + ":" + (amount + Math.round(value));
-			if (newline.length() > 15)
 			{
-				throw new SignException("Line too long!");
+				final int stackamount = getIntegerPositive(split[0]);
+				final int amount = getInteger(split[2]);
+				final String newline = stackamount + " " + split[1] + ":" + (amount + Math.round(value));
+				if (newline.length() > 15)
+				{
+					throw new SignException("Line too long!");
+				}
+				sign.setLine(index, newline);
+				return;
+			}
+			else
+			{
+				final int stackamount = getIntegerPositive(split[0]);
+				//TODO: Unused local variable
+				final ItemStack item = getItemStack(split[1], stackamount, ess);
+				final int amount = getInteger(split[2]);
+				final String newline = stackamount + " " + split[1] + ":" + (amount + Math.round(value));
+				if (newline.length() > 15)
+				{
+					throw new SignException("Line too long!");
+				}
+				sign.setLine(index, newline);
+				return;
 			}
-			sign.setLine(index, newline);
-			return;
 		}
 		throw new SignException(_("invalidSignLine", index + 1));
 	}