/*

 * Copyright (C) 2005, 2006, 2007 Apple Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1.  Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer. 

 * 2.  Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution. 

 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

 *     its contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission. 

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY

 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#ifndef JSRetainPtr_h

#define JSRetainPtr_h

#include <JavaScriptCore/JSStringRef.h>

#include <algorithm>

inline void JSRetain(JSStringRef string) { JSStringRetain(string); }

inline void JSRelease(JSStringRef string) { JSStringRelease(string); }

enum AdoptTag { Adopt };

template <typename T> class JSRetainPtr {

public:

    JSRetainPtr() : m_ptr(0) {}

    JSRetainPtr(T ptr) : m_ptr(ptr) { if (ptr) JSRetain(ptr); }

    JSRetainPtr(AdoptTag, T ptr) : m_ptr(ptr) { }

    JSRetainPtr(const JSRetainPtr& o) : m_ptr(o.m_ptr) { if (T ptr = m_ptr) JSRetain(ptr); }

    ~JSRetainPtr() { if (T ptr = m_ptr) JSRelease(ptr); }

    template <typename U> JSRetainPtr(const JSRetainPtr<U>& o) : m_ptr(o.get()) { if (T ptr = m_ptr) JSRetain(ptr); }

    T get() const { return m_ptr; }

    T releaseRef() { T tmp = m_ptr; m_ptr = 0; return tmp; }

    T operator->() const { return m_ptr; }

    bool operator!() const { return !m_ptr; }

    // This conversion operator allows implicit conversion to bool but not to other integer types.

    typedef T JSRetainPtr::*UnspecifiedBoolType;

    operator UnspecifiedBoolType() const { return m_ptr ? &JSRetainPtr::m_ptr : 0; }

    JSRetainPtr& operator=(const JSRetainPtr&);

    template <typename U> JSRetainPtr& operator=(const JSRetainPtr<U>&);

    JSRetainPtr& operator=(T);

    template <typename U> JSRetainPtr& operator=(U*);

    void adopt(T);

    void swap(JSRetainPtr&);

private:

    T m_ptr;

};

template <typename T> inline JSRetainPtr<T>& JSRetainPtr<T>::operator=(const JSRetainPtr<T>& o)

{

    T optr = o.get();

    if (optr)

        JSRetain(optr);

    T ptr = m_ptr;

    m_ptr = optr;

    if (ptr)

        JSRelease(ptr);

    return *this;

}

template <typename T> template <typename U> inline JSRetainPtr<T>& JSRetainPtr<T>::operator=(const JSRetainPtr<U>& o)

{

    T optr = o.get();

    if (optr)

        JSRetain(optr);

    T ptr = m_ptr;

    m_ptr = optr;

    if (ptr)

        JSRelease(ptr);

    return *this;

}

template <typename T> inline JSRetainPtr<T>& JSRetainPtr<T>::operator=(T optr)

{

    if (optr)

        JSRetain(optr);

    T ptr = m_ptr;

    m_ptr = optr;

    if (ptr)

        JSRelease(ptr);

    return *this;

}

template <typename T> inline void JSRetainPtr<T>::adopt(T optr)

{

    T ptr = m_ptr;

    m_ptr = optr;

    if (ptr)

        JSRelease(ptr);

}

template <typename T> template <typename U> inline JSRetainPtr<T>& JSRetainPtr<T>::operator=(U* optr)

{

    if (optr)

        JSRetain(optr);

    T ptr = m_ptr;

    m_ptr = optr;

    if (ptr)

        JSRelease(ptr);

    return *this;

}

template <class T> inline void JSRetainPtr<T>::swap(JSRetainPtr<T>& o)

{

    std::swap(m_ptr, o.m_ptr);

}

template <class T> inline void swap(JSRetainPtr<T>& a, JSRetainPtr<T>& b)

{

    a.swap(b);

}

template <typename T, typename U> inline bool operator==(const JSRetainPtr<T>& a, const JSRetainPtr<U>& b)

{ 

    return a.get() == b.get(); 

}

template <typename T, typename U> inline bool operator==(const JSRetainPtr<T>& a, U* b)

{ 

    return a.get() == b; 

}

template <typename T, typename U> inline bool operator==(T* a, const JSRetainPtr<U>& b) 

{

    return a == b.get(); 

}

template <typename T, typename U> inline bool operator!=(const JSRetainPtr<T>& a, const JSRetainPtr<U>& b)

{ 

    return a.get() != b.get(); 

}

template <typename T, typename U> inline bool operator!=(const JSRetainPtr<T>& a, U* b)

{

    return a.get() != b; 

}

template <typename T, typename U> inline bool operator!=(T* a, const JSRetainPtr<U>& b)

{ 

    return a != b.get(); 

}

#endif // JSRetainPtr_h