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/*=========================================================================
*
* Copyright NumFOCUS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
// First include the header file to be tested:
#include "itkObjectFactoryBase.h"
#include "itkLightObject.h"
#include "itkSmartPointer.h"
#include "itkVersion.h"
#include <gtest/gtest.h>
namespace
{
// The name of the test object type, as stored by the test object factory.
constexpr const char * testObjectTypeName = "Test Object";
// A "dummy" object type, just for unit test purposes.
class TestObject : public itk::LightObject
{};
// A factory of test objects.
class TestObjectFactory : public itk::ObjectFactoryBase
{
public:
ITK_DISALLOW_COPY_AND_MOVE(TestObjectFactory);
using Self = TestObjectFactory;
using Superclass = ObjectFactoryBase;
using Pointer = itk::SmartPointer<Self>;
using ConstPointer = itk::SmartPointer<const Self>;
const char *
GetITKSourceVersion() const override
{
return ITK_SOURCE_VERSION;
}
const char *
GetDescription() const override
{
return "Test Object Factory";
}
itkOverrideGetNameOfClassMacro(TestObjectFactory);
itkFactorylessNewMacro(Self);
protected:
TestObjectFactory()
{
this->RegisterOverride(
testObjectTypeName, testObjectTypeName, testObjectTypeName, true, itk::CreateObjectFunction<TestObject>::New());
}
~TestObjectFactory() override = default;
};
// Ensures that a TestObjectFactory is registered and unregistered, following the C++ RAII idiom (Resource Acquisition
// Is Initialization).
class TestObjectFactoryRegistration
{
public:
ITK_DISALLOW_COPY_AND_MOVE(TestObjectFactoryRegistration);
TestObjectFactoryRegistration() { itk::ObjectFactoryBase::RegisterFactory(m_Factory); }
~TestObjectFactoryRegistration() { itk::ObjectFactoryBase::UnRegisterFactory(m_Factory); }
private:
TestObjectFactory::Pointer m_Factory{ TestObjectFactory::New() };
};
} // namespace
// Tests that ObjectFactoryBase::CreateInstance creates an instance that has a reference count of 2.
TEST(ObjectFactoryBase, CreatedInstanceHasReferenceCountOfTwo)
{
const TestObjectFactoryRegistration registration{};
const auto instance = itk::ObjectFactoryBase::CreateInstance(testObjectTypeName);
// The type specified by testObjectTypeName is registered, so the created instance may not be null.
ASSERT_NE(instance, nullptr);
// The main check: expect the reference count to be 2, not 1, and certainly not zero!
EXPECT_EQ(instance->GetReferenceCount(), 2);
// Avoid a memory leak.
instance->UnRegister();
}
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