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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.mockups;

import java.lang.reflect.*;

import static mockit.external.asm4.Opcodes.*;

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

/**
 * Responsible for collecting the signatures of all methods defined in a given mock class which are explicitly annotated
 * as {@link mockit.Mock mocks}.
 */
final class MockMethodCollector extends ClassVisitor
{
   private static final int INVALID_METHOD_ACCESSES = ACC_BRIDGE + ACC_SYNTHETIC + ACC_ABSTRACT + ACC_NATIVE;

   private final MockMethods mockMethods;

   private boolean collectingFromSuperClass;
   private String enclosingClassDescriptor;

   MockMethodCollector(MockMethods mockMethods) { this.mockMethods = mockMethods; }

   void collectMockMethods(Class mockClass)
   {
      ClassLoad.registerLoadedClass(mockClass);

      Class classToCollectMocksFrom = mockClass;

      do {
         ClassReader mcReader = ClassFile.createClassFileReader(classToCollectMocksFrom);
         mcReader.accept(this, ClassReader.SKIP_FRAMES);
         classToCollectMocksFrom = classToCollectMocksFrom.getSuperclass();
         collectingFromSuperClass = true;
      }
      while (classToCollectMocksFrom != Object.class && classToCollectMocksFrom != MockUp.class);
   }

   @Override
   public void visit(int version, int access, String name, String signature, String superName, String[] interfaces)
   {
      if (!collectingFromSuperClass) {
         mockMethods.setMockClassInternalName(name);

         int p = name.lastIndexOf('$');

         if (p > 0) {
            enclosingClassDescriptor = "(L" + name.substring(0, p) + ";)V";
         }
      }
   }

   /**
    * Adds the method specified to the set of mock methods, as long as it's annotated with {@code @Mock}.
    *
    * @param signature generic signature for a Java 5 generic method, ignored since redefinition only needs to consider
    * the "erased" signature
    * @param exceptions zero or more thrown exceptions in the method "throws" clause, also ignored
    */
   @Override
   public MethodVisitor visitMethod(
      final int access, final String methodName, final String methodDesc, String signature, String[] exceptions)
   {
      if ((access & INVALID_METHOD_ACCESSES) != 0) {
         return null;
      }

      if ("".equals(methodName)) {
         if (!collectingFromSuperClass && methodDesc.equals(enclosingClassDescriptor)) {
            enclosingClassDescriptor = null;
         }

         return null;
      }

      return new MethodVisitor()
      {
         @Override
         public AnnotationVisitor visitAnnotation(String desc, boolean visible)
         {
            if ("Lmockit/Mock;".equals(desc)) {
               MockMethods.MockMethod mockMethod =
                  mockMethods.addMethod(collectingFromSuperClass, methodName, methodDesc, Modifier.isStatic(access));

               if (mockMethod != null) {
                  return new MockAnnotationVisitor(mockMethod);
               }
            }

            return null;
         }

         @Override
         public void visitLocalVariable(
            String paramName, String paramDesc, String paramSignature, Label start, Label end, int index)
         {
            String classDesc = mockMethods.getMockClassInternalName();
            ParameterNames.registerName(classDesc, access, methodName, methodDesc, paramName, index);
         }
      };
   }

   private final class MockAnnotationVisitor extends AnnotationVisitor
   {
      private final MockMethods.MockMethod mockMethod;
      private MockState mockState;

      private MockAnnotationVisitor(MockMethods.MockMethod mockMethod)
      {
         this.mockMethod = mockMethod;

         if (mockMethod.hasInvocationParameter) {
            getMockState();
         }
      }

      @Override
      public void visit(String name, Object value)
      {
         Integer numInvocations = (Integer) value;

         if ("invocations".equals(name)) {
            getMockState().expectedInvocations = numInvocations;
         }
         else if ("minInvocations".equals(name)) {
            getMockState().minExpectedInvocations = numInvocations;
         }
         else { // "maxInvocations"
            getMockState().maxExpectedInvocations = numInvocations;
         }
      }

      private MockState getMockState()
      {
         if (mockState == null) {
            mockState = new MockState(mockMethod);
         }

         return mockState;
      }

      @Override
      public void visitEnd()
      {
         if (mockState != null) {
            if (mockMethod.canBeReentered()) {
               mockState.makeReentrant();
            }

            mockMethods.addMockState(mockState);
         }
      }
   }
}