third_party/WebKit/Source/core/html/LinkResource.h

/*
 * Copyright (C) 2013 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
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 *
 *     * Redistributions of source code must retain the above copyright
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * 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
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 */

#ifndef LinkResource_h
#define LinkResource_h

#include "core/CoreExport.h"
#include "core/fetch/FetchRequest.h"
#include "platform/heap/Handle.h"
#include "platform/weborigin/KURL.h"
#include "wtf/text/WTFString.h"

namespace blink {

class HTMLLinkElement;
class LocalFrame;

class CORE_EXPORT LinkResource
    : public GarbageCollectedFinalized<LinkResource> {
  WTF_MAKE_NONCOPYABLE(LinkResource);

 public:
  enum LinkResourceType { Style, Import, Manifest, Other };

  explicit LinkResource(HTMLLinkElement*);
  virtual ~LinkResource();

  bool shouldLoadResource() const;
  LocalFrame* loadingFrame() const;

  virtual LinkResourceType type() const = 0;
  virtual void process() = 0;
  virtual void ownerRemoved() {}
  virtual void ownerInserted() {}
  virtual bool hasLoaded() const = 0;

  DECLARE_VIRTUAL_TRACE();

 protected:
  Member<HTMLLinkElement> m_owner;
};

class LinkRequestBuilder {
  STACK_ALLOCATED();

 public:
  explicit LinkRequestBuilder(HTMLLinkElement* owner);

  bool isValid() const { return !m_url.isEmpty() && m_url.isValid(); }
  const KURL& url() const { return m_url; }
  const AtomicString& charset() const { return m_charset; }
  FetchRequest build(bool lowPriority) const;

 private:
  Member<HTMLLinkElement> m_owner;
  KURL m_url;
  AtomicString m_charset;
};

}  // namespace blink

#endif  // LinkResource_h