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/*
* Copyright (c) 2011 Samsung Electronics Co., Ltd All Rights Reserved
*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.
*/
#ifndef WRTDEVICEAPIS_COMMONSJAVASCRIPT_PRIVATEOBJECT_H_
#define WRTDEVICEAPIS_COMMONSJAVASCRIPT_PRIVATEOBJECT_H_
#include <JavaScriptCore/JavaScript.h>
#include <dpl/noncopyable.h>
#include <dpl/assert.h>
#include <Commons/Exception.h>
#include <Commons/TypeTraits.h>
namespace WrtDeviceApis {
namespace CommonsJavaScript {
template<class T>
struct NoAcquire
{
void acquire(T*)
{}
protected:
~NoAcquire()
{}
};
template<class T>
struct AcquireByProtect
{
void acquire(T* object)
{
Assert(object && "Object passed to protect can't be NULL.");
JSValueProtect(object->getContext(), object->getObject());
}
protected:
~AcquireByProtect()
{}
};
template<class T>
struct NoRelease
{
void release(T* object)
{
(void)object;
}
protected:
~NoRelease()
{}
};
template<class T>
struct ReleaseByDelete
{
void release(T* object)
{
delete object->getObject();
}
protected:
~ReleaseByDelete()
{}
};
template<class T>
struct ReleaseByUnprotect
{
void release(T* object)
{
Assert(object && "Object passed to unprotect can't be NULL.");
JSValueUnprotect(object->getContext(), object->getObject());
}
protected:
~ReleaseByUnprotect()
{}
};
template<class T>
struct NoOwnership : protected NoAcquire<T>,
protected NoRelease<T>
{
protected:
~NoOwnership()
{}
};
template<class T>
struct OwnershipByAcquisition : protected NoAcquire<T>,
protected ReleaseByDelete<T>
{
protected:
~OwnershipByAcquisition()
{}
};
template<class T>
struct OwnershipByProtection : protected AcquireByProtect<T>,
protected ReleaseByUnprotect<T>
{
protected:
~OwnershipByProtection()
{}
};
template<class PrivateClass,
template <class> class OwnershipPolicy = OwnershipByAcquisition>
class PrivateObject : public DPL::Noncopyable,
protected OwnershipPolicy<PrivateObject<PrivateClass, OwnershipPolicy> >
{
public:
typedef PrivateClass ObjectType;
public:
/**
* Creates storage object for JS private data.
* @param context JS (root/global) context.
* @param object Object to store.
* @throw NullPointerException When object is pointer and is set to NULL.
*/
PrivateObject(JSContextRef context,
const PrivateClass& object) :
m_context(context),
m_object(object)
{
Assert(NULL != m_context && "Context is NULL.");
Assert(!Commons::IsNull<PrivateClass>::value(
object) && "Object is NULL.");
this->acquire(this);
}
/**
* Destroys instance of the object.
*/
virtual ~PrivateObject()
{
this->release(this);
}
/**
* Gets stored JS context.
* @return JavaScript context.
*/
virtual JSContextRef getContext() const
{
return m_context;
}
/**
* Gets stored object.
* @return Stored object.
*/
virtual PrivateClass getObject() const
{
return m_object;
}
protected:
JSContextRef m_context; ///< JS context.
PrivateClass m_object; ///< Stored object.
};
/**
* Specialization for type void.
*/
template<>
class PrivateObject<void, NoOwnership> : private DPL::Noncopyable
{
public:
/**
* Creates storage object for JS private data.
* @param context JS (root/global) context.
* @remarks Takes ownership over stored object.
*/
explicit PrivateObject(JSContextRef context) : m_context(context)
{
Assert(NULL != m_context && "Context is NULL.");
}
/**
* Destroys instance of the object.
*/
virtual ~PrivateObject()
{}
/**
* Gets stored JS context.
* @return JavaScript context.
*/
virtual JSContextRef getContext() const
{
return m_context;
}
protected:
JSContextRef m_context;
};
template<class C>
struct PrivateObjectT
{
typedef PrivateObject<C, NoOwnership> Type;
};
template<class C>
struct PrivateObjectT<C*>
{
typedef PrivateObject<C*, OwnershipByAcquisition> Type;
};
template<>
struct PrivateObjectT<JSObjectRef>
{
typedef PrivateObject<JSObjectRef, NoOwnership> Type;
};
template<>
struct PrivateObjectT<void>
{
typedef PrivateObject<void, NoOwnership> Type;
};
} // CommonsJavaScript
} // WrtDeviceApis
#endif /* PRIVATEOBJECT_H_ */
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