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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) 2006-2014 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.util;

import java.lang.reflect.*;

import org.jetbrains.annotations.*;

public final class RealMethod
{
   @NotNull public final Method method;

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

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

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

   @NotNull
   private Method initialize(@NotNull Class realClass, @NotNull String methodName, @NotNull 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);
            }
         }
      }
   }
}