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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.expectations.injection;

import mockit.external.asm4.*;
import mockit.internal.*;
import mockit.internal.state.*;

final class ParameterNameExtractor extends ClassVisitor
{
   private final boolean forMethods;
   private String classDesc;
   private String methodName;
   private String methodDesc;

   ParameterNameExtractor(boolean forMethods) { this.forMethods = forMethods; }

   String extractNames(Class classOfInterest)
   {
      String className = classOfInterest.getName();
      classDesc = className.replace('.', '/');

      if (!ParameterNames.hasNamesForClass(classDesc)) {
         ClassReader cr = ClassFile.createClassFileReader(classOfInterest);
         cr.accept(this, ClassReader.SKIP_FRAMES);
      }

      return classDesc;
   }

   @Override
   public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions)
   {
      boolean visitingAMethod = name.charAt(0) != '<';

      if (visitingAMethod == forMethods) {
         methodName = name;
         methodDesc = desc;
         return new MethodOrConstructorVisitor();
      }

      return null;
   }

   private final class MethodOrConstructorVisitor extends MethodVisitor
   {
      @Override
      public void visitLocalVariable(String name, String desc, String signature, Label start, Label end, int index)
      {
         ParameterNames.registerName(classDesc, methodName, methodDesc, name);
      }
   }
}