Page Speed Optimization Libraries
1.8.31.2
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00001 /* 00002 * Copyright 2012 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 */ 00017 00018 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_INSERT_DNS_PREFETCH_FILTER_H_ 00019 #define NET_INSTAWEB_REWRITER_PUBLIC_INSERT_DNS_PREFETCH_FILTER_H_ 00020 00021 #include "net/instaweb/htmlparse/public/html_element.h" 00022 #include "net/instaweb/rewriter/public/common_filter.h" 00023 #include "net/instaweb/util/public/basictypes.h" 00024 #include "net/instaweb/util/public/string_util.h" 00025 00026 namespace net_instaweb { 00027 00028 class FlushEarlyInfo; 00029 class RewriteDriver; 00030 00033 class InsertDnsPrefetchFilter : public CommonFilter { 00034 public: 00035 explicit InsertDnsPrefetchFilter(RewriteDriver* driver); 00036 virtual ~InsertDnsPrefetchFilter(); 00037 00038 virtual void StartDocumentImpl(); 00039 virtual void EndDocument(); 00040 virtual void StartElementImpl(HtmlElement* element); 00041 virtual void EndElementImpl(HtmlElement* element); 00042 00043 virtual const char* Name() const { return "InsertDnsPrefetchFilter"; } 00046 virtual void DetermineEnabled(); 00047 virtual const char* id() const { return "idp"; } 00048 00049 private: 00050 void Clear(); 00051 00054 void MarkAlreadyInHead(HtmlElement::Attribute* urlattr); 00055 00059 bool IsDomainListStable(const FlushEarlyInfo& flush_early_info) const; 00060 void DebugPrint(const char* msg); 00061 00064 bool dns_prefetch_inserted_; 00065 00067 bool in_head_; 00068 00071 StringSet domains_to_ignore_; 00072 00075 StringSet domains_in_body_; 00076 00079 StringVector dns_prefetch_domains_; 00080 00082 bool user_agent_supports_dns_prefetch_; 00083 00084 DISALLOW_COPY_AND_ASSIGN(InsertDnsPrefetchFilter); 00085 }; 00086 00087 } 00088 00089 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_INSERT_DNS_PREFETCH_FILTER_H_