Page Speed Optimization Libraries
1.6.29.3
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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_