downstream_caching_directives.h

// Copyright 2013 Google Inc. All Rights Reserved.

#ifndef NET_INSTAWEB_REWRITER_PUBLIC_DOWNSTREAM_CACHING_DIRECTIVES_H_
#define NET_INSTAWEB_REWRITER_PUBLIC_DOWNSTREAM_CACHING_DIRECTIVES_H_

#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/gtest_prod.h"
#include "pagespeed/kernel/base/string.h"  

namespace net_instaweb {

class RequestHeaders;

class DownstreamCachingDirectives {
 public:
  static const char kNoCapabilitiesSpecified[];

  DownstreamCachingDirectives();
  virtual ~DownstreamCachingDirectives();

  void ParseCapabilityListFromRequestHeaders(
      const RequestHeaders& request_headers);

  bool SupportsImageInlining() const;
  bool SupportsLazyloadImages() const;
  bool SupportsJsDefer() const;
  bool SupportsWebp() const;
  bool SupportsWebpLosslessAlpha() const;
  bool SupportsWebpAnimated() const;

 private:
  static bool IsPropertySupported(LazyBool* supports_property,
                                  const GoogleString& capability,
                                  const GoogleString& capability_list);

  mutable LazyBool supports_image_inlining_;
  mutable LazyBool supports_js_defer_;
  mutable LazyBool supports_lazyload_images_;
  mutable LazyBool supports_webp_;
  mutable LazyBool supports_webp_lossless_alpha_;
  mutable LazyBool supports_webp_animated_;

  GoogleString capabilities_to_be_supported_;

  
};

}  

#endif