/*
   * 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 TiRetainPtr_h
  define TiRetainPtr_h
  
  include <TiCore/TiStringRef.h>
  include <algorithm>
  
  inline void TiRetain(TiStringRef string) { TiStringRetain(string); }
  inline void TiRelease(TiStringRef string) { TiStringRelease(string); }
  
  enum AdoptTag { Adopt };
  
  template <typename T> class TiRetainPtr {
  public:
      TiRetainPtr() : m_ptr(0) {}
      TiRetainPtr(T ptr) : m_ptr(ptr) { if (ptr) TiRetain(ptr); }
  
      TiRetainPtr(AdoptTag, T ptr) : m_ptr(ptr) { }
      
      TiRetainPtr(const TiRetainPtr& o) : m_ptr(o.m_ptr) { if (T ptr = m_ptr) TiRetain(ptr); }
  
      ~TiRetainPtr() { if (T ptr = m_ptr) TiRelease(ptr); }
      
      template <typename U> TiRetainPtr(const TiRetainPtr<U>& o) : m_ptr(o.get()) { if (T ptr = m_ptr) TiRetain(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 TiRetainPtr::*UnspecifiedBoolType;
      operator UnspecifiedBoolType() const { return m_ptr ? &TiRetainPtr::m_ptr : 0; }
      
      TiRetainPtr& operator=(const TiRetainPtr&);
      template <typename U> TiRetainPtr& operator=(const TiRetainPtr<U>&);
      TiRetainPtr& operator=(T);
      template <typename U> TiRetainPtr& operator=(U*);
  
      void adopt(T);
      
      void swap(TiRetainPtr&);
  
  private:
      T m_ptr;
  };
  
  template <typename T> inline TiRetainPtr<T>& TiRetainPtr<T>::operator=(const TiRetainPtr<T>& o)
  {
      T optr = o.get();
      if (optr)
          TiRetain(optr);
      T ptr = m_ptr;
      m_ptr = optr;
      if (ptr)
          TiRelease(ptr);
      return *this;
  }
  
  template <typename T> template <typename U> inline TiRetainPtr<T>& TiRetainPtr<T>::operator=(const TiRetainPtr<U>& o)
  {
      T optr = o.get();
      if (optr)
          TiRetain(optr);
      T ptr = m_ptr;
      m_ptr = optr;
      if (ptr)
          TiRelease(ptr);
      return *this;
  }
  
  template <typename T> inline TiRetainPtr<T>& TiRetainPtr<T>::operator=(T optr)
  {
      if (optr)
          TiRetain(optr);
      T ptr = m_ptr;
      m_ptr = optr;
      if (ptr)
          TiRelease(ptr);
      return *this;
  }
  
  template <typename T> inline void TiRetainPtr<T>::adopt(T optr)
  {
      T ptr = m_ptr;
      m_ptr = optr;
      if (ptr)
          TiRelease(ptr);
  }
  
  template <typename T> template <typename U> inline TiRetainPtr<T>& TiRetainPtr<T>::operator=(U* optr)
  {
      if (optr)
          TiRetain(optr);
      T ptr = m_ptr;
      m_ptr = optr;
      if (ptr)
          TiRelease(ptr);
      return *this;
  }
  
  template <class T> inline void TiRetainPtr<T>::swap(TiRetainPtr<T>& o)
  {
      std::swap(m_ptr, o.m_ptr);
  }
  
  template <class T> inline void swap(TiRetainPtr<T>& a, TiRetainPtr<T>& b)
  {
      a.swap(b);
  }
  
  template <typename T, typename U> inline bool operator==(const TiRetainPtr<T>& a, const TiRetainPtr<U>& b)
  { 
      return a.get() == b.get(); 
  }
  
  template <typename T, typename U> inline bool operator==(const TiRetainPtr<T>& a, U* b)
  { 
      return a.get() == b; 
  }
  
  template <typename T, typename U> inline bool operator==(T* a, const TiRetainPtr<U>& b) 
  {
      return a == b.get(); 
  }
  
  template <typename T, typename U> inline bool operator!=(const TiRetainPtr<T>& a, const TiRetainPtr<U>& b)
  { 
      return a.get() != b.get(); 
  }
  
  template <typename T, typename U> inline bool operator!=(const TiRetainPtr<T>& a, U* b)
  {
      return a.get() != b; 
  }
  
  template <typename T, typename U> inline bool operator!=(T* a, const TiRetainPtr<U>& b)
  { 
      return a != b.get(); 
  }
  
  endif // TiRetainPtr_h