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JMockit is a Java toolkit for automated developer testing. It contains mocking/faking APIs and a code coverage tool, 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 JMockit developers
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.util;

import javax.annotation.*;

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

   public static boolean isAnonymousClass(@Nonnull String className) {
      int positionJustBefore = className.lastIndexOf('$');

      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;
   }
}