Page Speed Optimization Libraries  1.6.29.3
net/instaweb/rewriter/public/meta_tag_filter.h
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00001 /*
00002  * Copyright 2011 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 
00021 
00022 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_META_TAG_FILTER_H_
00023 #define NET_INSTAWEB_REWRITER_PUBLIC_META_TAG_FILTER_H_
00024 
00025 #include "net/instaweb/rewriter/public/common_filter.h"
00026 #include "net/instaweb/util/public/basictypes.h"
00027 
00028 namespace net_instaweb {
00029 
00030 class HtmlElement;
00031 class ResponseHeaders;
00032 class RewriteDriver;
00033 class Statistics;
00034 class Variable;
00035 
00039 class MetaTagFilter : public CommonFilter {
00040  public:
00041   explicit MetaTagFilter(RewriteDriver* rewrite_driver);
00042   virtual ~MetaTagFilter();
00043 
00044   static void InitStats(Statistics* stats);
00045 
00046   virtual void StartDocumentImpl();
00047   virtual void StartElementImpl(HtmlElement* element) {}
00048 
00056   virtual void EndElementImpl(HtmlElement* element);
00057   virtual void Flush();
00058 
00059   virtual const char* Name() const { return "ConvertMetaTags"; }
00060 
00063   static bool ExtractAndUpdateMetaTagDetails(
00064       HtmlElement* element,
00065       ResponseHeaders* response_headers);
00066 
00067  private:
00068   ResponseHeaders* response_headers_;
00069 
00071   Variable* converted_meta_tag_count_;
00072 
00073   DISALLOW_COPY_AND_ASSIGN(MetaTagFilter);
00074 };
00075 
00076 }  
00077 
00078 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_META_TAG_FILTER_H_
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