Item template structure

Signed-off-by: Rogiel <rogiel@rogiel.com>

src/main/java/com/l2jserver/service/game/template/ScriptTemplateService.java

@@ -59,6 +59,11 @@ public class ScriptTemplateService extends AbstractService implements
 
 	public void addTemplate(Class<? extends Template<?>> t) {
 		final Template<?> template = injector.getInstance(t);
+		if (templates.containsKey(template.getID()))
+			throw new TemplateException("Template with ID" + template.getID()
+					+ " is already registered for "
+					+ templates.get(template.getID()));
+
 		if (template.getID() != null)
 			templates.put(template.getID(), template);
 	}

src/main/java/com/l2jserver/service/game/template/TemplateException.java

@@ -0,0 +1,21 @@
+package com.l2jserver.service.game.template;
+
+public class TemplateException extends RuntimeException {
+	private static final long serialVersionUID = 1L;
+
+	public TemplateException() {
+		super();
+	}
+
+	public TemplateException(String message, Throwable cause) {
+		super(message, cause);
+	}
+
+	public TemplateException(String message) {
+		super(message);
+	}
+
+	public TemplateException(Throwable cause) {
+		super(cause);
+	}
+}