/*
 * Copyright (c) 2006-2012 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.util;

public final class ClassNaming
{
   /**
    * This method was created to work around an issue in the standard {@link Class#isAnonymousClass()} method, which
    * causes a sibling nested class to be loaded when called on a nested class. If that sibling nested class is not in
    * the classpath, a {@code ClassNotFoundException} would result.
    * <p/>
    * This method checks only the given class name, never causing any other classes to be loaded.
    */
   public static boolean isAnonymousClass(Class<?> aClass)
   {
      return isAnonymousClass(aClass.getName());
   }

   public static boolean isAnonymousClass(String className)
   {
      int p = className.lastIndexOf('$');
      return isAllNumeric(className, p);
   }

   public static boolean isAllNumeric(String className, int positionJustBefore)
   {
      if (positionJustBefore <= 0) {
         return false;
      }

      int nextPos = positionJustBefore + 1;
      int n = className.length();

      while (nextPos < n) {
         char c = className.charAt(nextPos);
         if (c < '0' || c > '9') return false;
         nextPos++;
      }

      return true;
   }
}