/*
 * Copyright (C) 2003, 2006, 2008 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. 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 FontFamily_h
#define FontFamily_h

#include "platform/PlatformExport.h"
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/text/AtomicString.h"

namespace blink {

class SharedFontFamily;

class PLATFORM_EXPORT FontFamily {
  DISALLOW_NEW();

 public:
  FontFamily() {}
  ~FontFamily();

  void setFamily(const AtomicString& family) { m_family = family; }
  const AtomicString& family() const { return m_family; }
  bool familyIsEmpty() const { return m_family.isEmpty(); }

  const FontFamily* next() const;

  void appendFamily(PassRefPtr<SharedFontFamily>);
  PassRefPtr<SharedFontFamily> releaseNext();

 private:
  AtomicString m_family;
  RefPtr<SharedFontFamily> m_next;
};

class PLATFORM_EXPORT SharedFontFamily : public FontFamily,
                                         public RefCounted<SharedFontFamily> {
  USING_FAST_MALLOC(SharedFontFamily);
  WTF_MAKE_NONCOPYABLE(SharedFontFamily);

 public:
  static PassRefPtr<SharedFontFamily> create() {
    return adoptRef(new SharedFontFamily);
  }

 private:
  SharedFontFamily() {}
};

PLATFORM_EXPORT bool operator==(const FontFamily&, const FontFamily&);
inline bool operator!=(const FontFamily& a, const FontFamily& b) {
  return !(a == b);
}

inline FontFamily::~FontFamily() {
  RefPtr<SharedFontFamily> reaper = m_next.release();
  while (reaper && reaper->hasOneRef()) {
    // implicitly protects reaper->next, then derefs reaper
    reaper = reaper->releaseNext();
  }
}

inline const FontFamily* FontFamily::next() const {
  return m_next.get();
}

inline void FontFamily::appendFamily(PassRefPtr<SharedFontFamily> family) {
  m_next = family;
}

inline PassRefPtr<SharedFontFamily> FontFamily::releaseNext() {
  return m_next.release();
}

}  // namespace blink

#endif
