Page Speed Optimization Libraries  1.3.25.1
net/instaweb/rewriter/public/critical_images_beacon_filter.h
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00001 /*
00002  * Copyright 2013 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_BEACON_FILTER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_BEACON_FILTER_H_
00021 
00022 #include "net/instaweb/htmlparse/public/empty_html_filter.h"
00023 #include "net/instaweb/util/public/basictypes.h"
00024 
00025 namespace net_instaweb {
00026 
00027 class HtmlElement;
00028 class RewriteDriver;
00029 class Statistics;
00030 class Variable;
00031 
00036 class CriticalImagesBeaconFilter : public EmptyHtmlFilter {
00037  public:
00039   static const char kCriticalImagesBeaconAddedCount[];
00040 
00041   explicit CriticalImagesBeaconFilter(RewriteDriver* driver);
00042   virtual ~CriticalImagesBeaconFilter();
00043 
00044   virtual void DetermineEnabled();
00045 
00046   static void InitStats(Statistics* statistics);
00047   static void Terminate() {}
00048 
00049   virtual void StartDocument();
00050   virtual void EndElement(HtmlElement* element);
00051   virtual const char* Name() const { return "CriticalImagesBeacon"; }
00052 
00053  private:
00055   void Clear();
00056 
00057   RewriteDriver* driver_;
00058   bool added_script_;
00060   Variable* critical_images_beacon_added_count_;
00061 
00062   DISALLOW_COPY_AND_ASSIGN(CriticalImagesBeaconFilter);
00063 };
00064 
00065 }  
00066 
00067 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_BEACON_FILTER_H_
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