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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.state;

import java.lang.reflect.*;
import java.util.*;

import mockit.external.asm4.Type;

public final class ParameterNames
{
   private static final Map> classesToMethodsToParameters =
      new HashMap>();
   private static final String[] NO_PARAMETERS = new String[0];

   public static boolean hasNamesForClass(String classDesc)
   {
      return classesToMethodsToParameters.containsKey(classDesc);
   }

   public static void registerName(
      String classDesc, int methodAccess, String methodName, String methodDesc, String name, int index)
   {
      if ("this".equals(name)) {
         return;
      }

      Map methodsToParameters = classesToMethodsToParameters.get(classDesc);

      if (methodsToParameters == null) {
         methodsToParameters = new HashMap();
         classesToMethodsToParameters.put(classDesc, methodsToParameters);
      }

      String methodKey = methodName + methodDesc;
      String[] parameterNames = methodsToParameters.get(methodKey);

      if (parameterNames == null) {
         int numParameters = Type.getArgumentTypes(methodDesc).length;
         parameterNames = numParameters == 0 ? NO_PARAMETERS : new String[numParameters];
         methodsToParameters.put(methodKey, parameterNames);
      }

      if (!Modifier.isStatic(methodAccess)) {
         index--;
      }

      if (index < parameterNames.length) {
         parameterNames[index] = name;
      }
   }

   public static String getName(String classDesc, String methodDesc, int index)
   {
      Map methodsToParameters = classesToMethodsToParameters.get(classDesc);

      if (methodsToParameters == null) {
         return null;
      }

      String[] parameterNames = methodsToParameters.get(methodDesc);
      return parameterNames == null ? null : parameterNames[index];
   }
}