Add a removeByIndex utility method and a new arg reader.

src/com/massivecraft/mcore/cmd/arg/AREntityType.java

@@ -0,0 +1,48 @@
+package com.massivecraft.mcore.cmd.arg;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.EntityType;
+
+public class AREntityType extends ARAbstractSelect<EntityType>
+{
+	// -------------------------------------------- //
+	// INSTANCE & CONSTRUCT
+	// -------------------------------------------- //
+	
+	private static AREntityType i = new AREntityType();
+	public static AREntityType get() { return i; }
+	
+	// -------------------------------------------- //
+	// OVERRIDE
+	// -------------------------------------------- //
+	
+	@Override
+	public String typename()
+	{
+		return "entity type";
+	}
+
+	@SuppressWarnings("deprecation")
+	@Override
+	public EntityType select(String arg, CommandSender sender)
+	{
+		return EntityType.fromName(arg);
+	}
+
+	@SuppressWarnings("deprecation")
+	@Override
+	public Collection<String> altNames(CommandSender sender)
+	{
+		List<String> ret = new ArrayList<String>();
+		for (EntityType entityType : EntityType.values())
+		{
+			ret.add(entityType.getName());
+		}
+		return ret;
+	}
+	
+}

src/com/massivecraft/mcore/util/MUtil.java

@@ -449,6 +449,36 @@ public class MUtil
 		return ret;
 	}
 	
+	// -------------------------------------------- //
+	// COLLECTION MANIPULATION
+	// -------------------------------------------- //
+	
+	public static <T> T removeByIndex(Collection<T> coll, int index)
+	{
+		if (coll == null) throw new NullPointerException("coll");
+		
+		if (coll instanceof List<?>)
+		{
+			return ((List<T>)coll).remove(index);
+		}
+		
+		if (index < 0) throw new IndexOutOfBoundsException("index < 0");
+		if (index >= coll.size()) throw new IndexOutOfBoundsException("index > collection size");
+		
+		int i = -1;
+		Iterator<T> iter = coll.iterator();
+		while (iter.hasNext())
+		{
+			i++;
+			T ret = iter.next();
+			if (i != index) continue;
+			iter.remove();
+			return ret;
+		}
+		
+		return null;
+	}
+	
 	// -------------------------------------------- //
 	// LE NICE RANDOM
 	// -------------------------------------------- //