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

import java.lang.reflect.*;

public final class RealMethod
{
   public final Method method;

   public RealMethod(Class realClass, String methodName, String methodDesc)
   {
      method = initialize(realClass, methodName, methodDesc);
   }

   public RealMethod(String className, String methodNameAndDesc)
   {
      this(ClassLoad.loadClass(className), methodNameAndDesc);
   }

   public RealMethod(Class realClass, String methodNameAndDesc)
   {
      int p = methodNameAndDesc.indexOf('(');
      String methodName = methodNameAndDesc.substring(0, p);
      String methodDesc = methodNameAndDesc.substring(p);
      method = initialize(realClass, methodName, methodDesc);
   }

   private Method initialize(Class realClass, String methodName, String methodDesc)
   {
      Class[] parameterTypes = TypeDescriptor.getParameterTypes(methodDesc);
      Class ownerClass = realClass;

      while (true) {
         try {
            return ownerClass.getDeclaredMethod(methodName, parameterTypes);
         }
         catch (NoSuchMethodException e) {
            ownerClass = ownerClass.getSuperclass();

            if (ownerClass == Object.class) {
               throw new RuntimeException(e);
            }
         }
      }
   }
}