fallback_property_page.h

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/*
 * Copyright 2013 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http:///www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#ifndef PAGESPEED_OPT_HTTP_FALLBACK_PROPERTY_PAGE_H_
#define PAGESPEED_OPT_HTTP_FALLBACK_PROPERTY_PAGE_H_

#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/scoped_ptr.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/kernel/cache/cache_interface.h"
#include "pagespeed/opt/http/property_cache.h"

namespace net_instaweb {

class GoogleUrl;

class FallbackPropertyPage : public AbstractPropertyPage {
 public:
  FallbackPropertyPage(PropertyPage* actual_property_page,
                       PropertyPage* property_page_with_fallback_values);
  virtual ~FallbackPropertyPage();

  virtual PropertyValue* GetProperty(
      const PropertyCache::Cohort* cohort,
      const StringPiece& property_name);

  PropertyValue* GetFallbackProperty(
        const PropertyCache::Cohort* cohort,
        const StringPiece& property_name);

  virtual void UpdateValue(
      const PropertyCache::Cohort* cohort, const StringPiece& property_name,
      const StringPiece& value);

  virtual void WriteCohort(const PropertyCache::Cohort* cohort);

  virtual CacheInterface::KeyState GetCacheState(
      const PropertyCache::Cohort* cohort);

  virtual CacheInterface::KeyState GetFallbackCacheState(
        const PropertyCache::Cohort* cohort);

  virtual void DeleteProperty(const PropertyCache::Cohort* cohort,
                              const StringPiece& property_name);

  PropertyPage* actual_property_page() { return actual_property_page_.get(); }
  PropertyPage* property_page_with_fallback_values() {
    return property_page_with_fallback_values_.get();
  }

  static GoogleString GetFallbackPageUrl(const GoogleUrl& request_url);

  static bool IsFallbackUrl(const GoogleString& url);

 private:
  scoped_ptr<PropertyPage> actual_property_page_;
  scoped_ptr<PropertyPage> property_page_with_fallback_values_;
  
};

}  
#endif