text: /*
   * 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
   * 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 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 THIRD_PARTY_BLINK_RENDERER_CORE_HTML_LINK_RESOURCE_H_
  #define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_LINK_RESOURCE_H_
  
  #include "base/macros.h"
  #include "third_party/blink/renderer/core/core_export.h"
  #include "third_party/blink/renderer/platform/heap/handle.h"
  #include "third_party/blink/renderer/platform/wtf/text/text_encoding.h"
  
  namespace blink {
  
  class Document;
  class ExecutionContext;
  class HTMLLinkElement;
  class LocalFrame;
  
  class CORE_EXPORT LinkResource : public GarbageCollected<LinkResource> {
   public:
    enum LinkResourceType { kStyle, kImport, kManifest, kOther };
  
    explicit LinkResource(HTMLLinkElement*);
    virtual ~LinkResource();
  
    bool ShouldLoadResource() const;
    LocalFrame* LoadingFrame() const;
  
    virtual LinkResourceType GetType() const = 0;
    virtual void Process() = 0;
    virtual void OwnerRemoved() {}
    virtual void OwnerInserted() {}
    virtual bool HasLoaded() const = 0;
  
    virtual void Trace(Visitor*) const;
  
   protected:
    void Load();
  
    Document& GetDocument();
    const Document& GetDocument() const;
    WTF::TextEncoding GetCharset() const;
    ExecutionContext* GetExecutionContext();
  
    Member<HTMLLinkElement> owner_;
  
    DISALLOW_COPY_AND_ASSIGN(LinkResource);
  };
  
  }  // namespace blink
  
  #endif  // THIRD_PARTY_BLINK_RENDERER_CORE_HTML_LINK_RESOURCE_H_
  