Page Speed Optimization Libraries  1.8.31.2
net/instaweb/rewriter/public/add_instrumentation_filter.h
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00001 /*
00002  * Copyright 2010 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_ADD_INSTRUMENTATION_FILTER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_ADD_INSTRUMENTATION_FILTER_H_
00021 
00022 #include "net/instaweb/rewriter/public/common_filter.h"
00023 #include "net/instaweb/util/public/basictypes.h"
00024 #include "net/instaweb/util/public/string.h"
00025 #include "pagespeed/kernel/base/string_util.h"
00026 
00027 namespace net_instaweb {
00028 
00029 class HtmlElement;
00030 class RewriteDriver;
00031 class Statistics;
00032 class Variable;
00033 
00035 class AddInstrumentationFilter : public CommonFilter {
00036  public:
00037   static const char kLoadTag[];
00038   static const char kUnloadTag[];
00039   static GoogleString* kUnloadScriptFormatXhtml;
00040   static GoogleString* kTailScriptFormatXhtml;
00041 
00043   static const char kInstrumentationScriptAddedCount[];
00044 
00045   explicit AddInstrumentationFilter(RewriteDriver* driver);
00046   virtual ~AddInstrumentationFilter();
00047 
00048   static void InitStats(Statistics* statistics);
00049 
00050   virtual void StartDocumentImpl();
00051   virtual void EndDocument();
00052   virtual void StartElementImpl(HtmlElement* element);
00053   virtual void EndElementImpl(HtmlElement* element);
00054   virtual const char* Name() const { return "AddInstrumentation"; }
00055 
00056  protected:
00058   Variable* instrumentation_script_added_count_;
00059 
00060  private:
00062   GoogleString GetScriptJs(StringPiece event);
00063 
00066   void AddHeadScript(HtmlElement* element);
00067 
00068   bool found_head_;
00069   bool added_head_script_;
00070   bool added_unload_script_;
00071 
00072   DISALLOW_COPY_AND_ASSIGN(AddInstrumentationFilter);
00073 };
00074 
00075 }  
00076 
00077 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_ADD_INSTRUMENTATION_FILTER_H_
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