add factory of factories

abstract-factory/src/main/java/com/iluwatar/abstractfactory/App.java

@@ -25,6 +25,8 @@ package com.iluwatar.abstractfactory;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import com.iluwatar.abstractfactory.App.FactoryMaker.KingdomType;
+
 /**
  * 
  * The Abstract Factory pattern provides a way to encapsulate a group of individual factories that have a common theme
@@ -56,7 +58,7 @@ public class App {
     setCastle(factory.createCastle());
     setArmy(factory.createArmy());
   }
-
+  
   King getKing(final KingdomFactory factory) {
     return factory.createKing();
   }
@@ -92,6 +94,31 @@ public class App {
   private void setArmy(final Army army) {
     this.army = army;
   }
+
+  /**
+   * The factory of kingdom factories.
+   */
+  public static class FactoryMaker {
+	    
+	private FactoryMaker() {}
+	
+	public enum KingdomType {
+	  ELF,
+	  ORC
+	}
+	  
+	public static KingdomFactory makeFactory(KingdomType type) {
+
+	  switch (type) {
+		case ELF:
+		  return new ElfKingdomFactory();
+		case ORC:
+		  return new OrcKingdomFactory();
+		default:
+		  throw new IllegalArgumentException("KingdomType not supported.");
+	  }
+	}
+  }
   
   /**
    * Program entry point
@@ -104,17 +131,15 @@ public class App {
     App app = new App();
 
     LOGGER.info("Elf Kingdom");
-    app.createKingdom(new ElfKingdomFactory());
+    app.createKingdom(FactoryMaker.makeFactory(KingdomType.ELF));
     LOGGER.info(app.getArmy().getDescription());
     LOGGER.info(app.getCastle().getDescription());
     LOGGER.info(app.getKing().getDescription());
 
     LOGGER.info("Orc Kingdom");
-    app.createKingdom(new OrcKingdomFactory());
+    app.createKingdom(FactoryMaker.makeFactory(KingdomType.ORC));
     LOGGER.info(app.getArmy().getDescription());
     LOGGER.info(app.getCastle().getDescription());
     LOGGER.info(app.getKing().getDescription());
-
   }
-
-}
+}