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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.annotations;

import java.lang.reflect.*;

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

import mockit.*;
import mockit.external.asm4.*;
import mockit.internal.*;
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}.
 */
public final class AnnotatedMockMethodCollector extends ClassVisitor
{
   private static final int INVALID_FIELD_ACCESSES = ACC_FINAL + ACC_STATIC + ACC_SYNTHETIC;
   private static final int INVALID_METHOD_ACCESSES = ACC_BRIDGE + ACC_SYNTHETIC + ACC_ABSTRACT + ACC_NATIVE;

   private final AnnotatedMockMethods mockMethods;
   private boolean collectingFromSuperClass;
   private String enclosingClassDescriptor;

   public AnnotatedMockMethodCollector(AnnotatedMockMethods mockMethods)
   {
      this.mockMethods = mockMethods;
   }

   public void collectMockMethods(Class mockClass)
   {
      Utilities.registerLoadedClass(mockClass);

      Class classToCollectMocksFrom = mockClass;

      do {
         ClassReader mcReader = ClassFile.createClassFileReader(classToCollectMocksFrom);
         mcReader.accept(this, ClassReader.SKIP_DEBUG);
         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";
         }
      }
   }

   @Override
   public FieldVisitor visitField(int access, String name, String desc, String signature, Object value)
   {
      if ((access & INVALID_FIELD_ACCESSES) == 0 && "it".equals(name)) {
         mockMethods.setWithItField(true);
      }

      return null;
   }

   /**
    * Adds the method specified to the set of mock methods, representing it as name + desc, as long as it's
    * appropriate for such method to be a mock, as indicated by its access modifiers and by the presence of the
    * {@link Mock} annotation.
    *
    * @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 name, final String methodDesc, String signature, String[] exceptions)
   {
      if ((access & INVALID_METHOD_ACCESSES) != 0) {
         return null;
      }

      if (
         !collectingFromSuperClass && enclosingClassDescriptor != null &&
         "".equals(name) && methodDesc.equals(enclosingClassDescriptor)
      ) {
         mockMethods.setInnerMockClass(true);
         enclosingClassDescriptor = null;
      }

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

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

            return null;
         }
      };
   }

   private final class MockAnnotationVisitor extends AnnotationVisitor
   {
      private final String mockNameAndDesc;
      private MockState mockState;

      private MockAnnotationVisitor(String mockNameAndDesc)
      {
         this.mockNameAndDesc = mockNameAndDesc;

         if (mockNameAndDesc.contains("(Lmockit/Invocation;")) {
            getMockState();
         }
      }

      @Override
      public void visit(String name, Object value)
      {
         if ("invocations".equals(name)) {
            getMockState().expectedInvocations = (Integer) value;
         }
         else if ("minInvocations".equals(name)) {
            getMockState().minExpectedInvocations = (Integer) value;
         }
         else if ("maxInvocations".equals(name)) {
            getMockState().maxExpectedInvocations = (Integer) value;
         }
         else {
            boolean reentrant = (Boolean) value;

            if (reentrant) {
               getMockState().makeReentrant();
            }
         }
      }

      private MockState getMockState()
      {
         if (mockState == null) {
            mockState = new MockState(mockMethods.realClass, mockNameAndDesc);
         }

         return mockState;
      }

      @Override
      public void visitEnd()
      {
         if (mockState != null) {
            mockMethods.addMockState(mockState);
         }
      }
   }
}