text: /*
   * Copyright (C) 2011 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 TrackBase_h
  #define TrackBase_h
  
  #if ENABLE(VIDEO_TRACK)
  
  #include "EventTarget.h"
  #include <wtf/RefCounted.h>
  
  namespace WebCore {
  
  class Element;
  class HTMLMediaElement;
  
  class TrackBase : public RefCounted<TrackBase> {
  public:
      virtual ~TrackBase();
  
      enum Type { BaseTrack, TextTrack, AudioTrack, VideoTrack };
      Type type() const { return m_type; }
  
      void setMediaElement(HTMLMediaElement* element) { m_mediaElement = element; }
      HTMLMediaElement* mediaElement() { return m_mediaElement; }
      virtual Element* element();
  
      AtomicString kind() const { return m_kind; }
      virtual void setKind(const AtomicString&);
  
      AtomicString label() const { return m_label; }
      void setLabel(const AtomicString& label) { m_label = label; }
  
      AtomicString language() const { return m_language; }
      void setLanguage(const AtomicString& language) { m_language = language; }
  
      virtual void clearClient() = 0;
  
  protected:
      TrackBase(Type, const AtomicString& label, const AtomicString& language);
  
      virtual bool isValidKind(const AtomicString&) const = 0;
      virtual const AtomicString& defaultKindKeyword() const = 0;
  
      HTMLMediaElement* m_mediaElement;
  
  private:
      Type m_type;
      AtomicString m_kind;
      AtomicString m_label;
      AtomicString m_language;
  };
  
  } // namespace WebCore
  
  #endif
  #endif // TrackBase_h
  