// Copyright (c) 2014 Marshall A. Greenblatt. Portions copyright (c) 2012
// Google 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:
//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//    * 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.
//    * Neither the name of Google Inc. nor the name Chromium Embedded
// Framework 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
// OWNER OR 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 CEF_INCLUDE_BASE_CEF_REF_COUNTED_H_
#define CEF_INCLUDE_BASE_CEF_REF_COUNTED_H_
#pragma once

#if defined(BASE_MEMORY_REF_COUNTED_H_)
// Do nothing if the Chromium header has already been included.
// This can happen in cases where Chromium code is used directly by the
// client application. When using Chromium code directly always include
// the Chromium header first to avoid type conflicts.
#elif defined(USING_CHROMIUM_INCLUDES)
// When building CEF include the Chromium header directly.
#include "base/memory/ref_counted.h"
#else  // !USING_CHROMIUM_INCLUDES
// The following is substantially similar to the Chromium implementation.
// If the Chromium implementation diverges the below implementation should be
// updated to match.

#include 

#include "include/base/cef_atomic_ref_count.h"
#include "include/base/cef_build.h"
#ifndef NDEBUG
#include "include/base/cef_logging.h"
#endif
#include "include/base/cef_thread_collision_warner.h"

namespace base {

namespace cef_subtle {

class RefCountedBase {
 public:
  bool HasOneRef() const { return ref_count_ == 1; }

 protected:
  RefCountedBase()
      : ref_count_(0)
  #ifndef NDEBUG
      , in_dtor_(false)
  #endif
      {
  }

  ~RefCountedBase() {
  #ifndef NDEBUG
    DCHECK(in_dtor_)  {
 public:
  RefCountedData() : data() {}
  RefCountedData(const T& in_value) : data(in_value) {}

  T data;

 private:
  friend class base::RefCountedThreadSafe >;
  ~RefCountedData() {}
};

}  // namespace base

//
// A smart pointer class for reference counted objects.  Use this class instead
// of calling AddRef and Release manually on a reference counted object to
// avoid common memory leaks caused by forgetting to Release an object
// reference.  Sample usage:
//
//   class MyFoo : public RefCounted {
//    ...
//   };
//
//   void some_function() {
//     scoped_refptr foo = new MyFoo();
//     foo->Method(param);
//     // |foo| is released when this function returns
//   }
//
//   void some_other_function() {
//     scoped_refptr foo = new MyFoo();
//     ...
//     foo = NULL;  // explicitly releases |foo|
//     ...
//     if (foo)
//       foo->Method(param);
//   }
//
// The above examples show how scoped_refptr acts like a pointer to T.
// Given two scoped_refptr classes, it is also possible to exchange
// references between the two objects, like so:
//
//   {
//     scoped_refptr a = new MyFoo();
//     scoped_refptr b;
//
//     b.swap(a);
//     // now, |b| references the MyFoo object, and |a| references NULL.
//   }
//
// To make both |a| and |b| in the above example reference the same MyFoo
// object, simply use the assignment operator:
//
//   {
//     scoped_refptr a = new MyFoo();
//     scoped_refptr b;
//
//     b = a;
//     // now, |a| and |b| each own a reference to the same MyFoo object.
//   }
//
template 
class scoped_refptr {
 public:
  typedef T element_type;

  scoped_refptr() : ptr_(NULL) {
  }

  scoped_refptr(T* p) : ptr_(p) {
    if (ptr_)
      ptr_->AddRef();
  }

  scoped_refptr(const scoped_refptr& r) : ptr_(r.ptr_) {
    if (ptr_)
      ptr_->AddRef();
  }

  template 
  scoped_refptr(const scoped_refptr& r) : ptr_(r.get()) {
    if (ptr_)
      ptr_->AddRef();
  }

  ~scoped_refptr() {
    if (ptr_)
      ptr_->Release();
  }

  T* get() const { return ptr_; }

  // Allow scoped_refptr to be used in boolean expression
  // and comparison operations.
  operator T*() const { return ptr_; }

  T* operator->() const {
    assert(ptr_ != NULL);
    return ptr_;
  }

  scoped_refptr& operator=(T* p) {
    // AddRef first so that self assignment should work
    if (p)
      p->AddRef();
    T* old_ptr = ptr_;
    ptr_ = p;
    if (old_ptr)
      old_ptr->Release();
    return *this;
  }

  scoped_refptr& operator=(const scoped_refptr& r) {
    return *this = r.ptr_;
  }

  template 
  scoped_refptr& operator=(const scoped_refptr& r) {
    return *this = r.get();
  }

  void swap(T** pp) {
    T* p = ptr_;
    ptr_ = *pp;
    *pp = p;
  }

  void swap(scoped_refptr& r) {
    swap(&r.ptr_);
  }

 protected:
  T* ptr_;
};

// Handy utility for creating a scoped_refptr out of a T* explicitly without
// having to retype all the template arguments
template 
scoped_refptr make_scoped_refptr(T* t) {
  return scoped_refptr(t);
}

#endif  // !USING_CHROMIUM_INCLUDES

#endif  // CEF_INCLUDE_BASE_CEF_REF_COUNTED_H_