text: /*
   * 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:
   *
   * 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 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 DocumentResourceReference_h
  #define DocumentResourceReference_h
  
  #include "core/fetch/DocumentResource.h"
  #include "platform/heap/Handle.h"
  
  namespace blink {
  
  class DocumentResourceReference final : public GarbageCollectedFinalized<DocumentResourceReference>, public DocumentResourceClient {
      USING_GARBAGE_COLLECTED_MIXIN(DocumentResourceReference);
      USING_PRE_FINALIZER(DocumentResourceReference, removeSelf);
  public:
      DocumentResourceReference(DocumentResource* document)
          : m_document(document)
      {
          ThreadState::current()->registerPreFinalizer(this);
          m_document->addClient(this);
      }
      ~DocumentResourceReference() override {}
      DocumentResource* document() { return m_document.get(); }
      DEFINE_INLINE_TRACE()
      {
          visitor->trace(m_document);
          DocumentResourceClient::trace(visitor);
      }
  
  private:
      void removeSelf() { m_document->removeClient(this); }
  
      String debugName() const override { return "DocumentResourceReference"; }
      Member<DocumentResource> m_document;
  };
  
  } // namespace blink
  
  #endif
  