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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.

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/*
 * Copyright (c) 2006-2013 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.util;

import org.jetbrains.annotations.*;

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.
    * 
    * This method checks only the given class name, never causing any other classes to be loaded.
    */
   public static boolean isAnonymousClass(@NotNull Class aClass)
   {
      return isAnonymousClass(aClass.getName());
   }

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

   public static boolean isAllNumeric(@NotNull 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;
   }
}