Page Speed Optimization Libraries
1.7.30.1
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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_REWRITE_FILTER_H_ 00020 #define NET_INSTAWEB_REWRITER_PUBLIC_REWRITE_FILTER_H_ 00021 00022 #include "net/instaweb/rewriter/public/common_filter.h" 00023 #include "net/instaweb/rewriter/public/resource_slot.h" 00024 #include "net/instaweb/rewriter/public/rewrite_options.h" 00025 #include "net/instaweb/util/public/basictypes.h" 00026 #include "net/instaweb/util/public/string.h" 00027 #include "net/instaweb/util/public/string_util.h" 00028 00029 namespace net_instaweb { 00030 00031 class Resource; 00032 class ResourceContext; 00033 class RewriteContext; 00034 class RewriteDriver; 00035 class UrlSegmentEncoder; 00036 00037 class RewriteFilter : public CommonFilter { 00038 public: 00039 explicit RewriteFilter(RewriteDriver* driver) 00040 : CommonFilter(driver) { 00041 } 00042 virtual ~RewriteFilter(); 00043 00044 virtual const char* id() const = 0; 00045 00050 virtual void DetermineEnabled(); 00051 00056 virtual const UrlSegmentEncoder* encoder() const; 00057 00064 virtual bool ComputeOnTheFly() const; 00065 00069 virtual RewriteContext* MakeRewriteContext(); 00070 00074 virtual RewriteContext* MakeNestedRewriteContext( 00075 RewriteContext* parent, const ResourceSlotPtr& slot); 00076 00080 virtual void EncodeUserAgentIntoResourceContext( 00081 ResourceContext* context) const {} 00082 00095 static StringPiece GetCharsetForScript(const Resource* script, 00096 const StringPiece attribute_charset, 00097 const StringPiece enclosing_charset); 00098 00111 static GoogleString GetCharsetForStylesheet( 00112 const Resource* stylesheet, 00113 const StringPiece attribute_charset, 00114 const StringPiece enclosing_charset); 00115 00131 virtual const RewriteOptions::Filter* RelatedFilters(int* num_filters) const; 00132 00136 virtual const StringPieceVector* RelatedOptions() const { 00137 return NULL; 00138 } 00139 00140 protected: 00142 virtual const char* LoggingId() { return id(); } 00143 00144 private: 00149 virtual bool UsesPropertyCacheDomCohort() const { return false; } 00150 00151 DISALLOW_COPY_AND_ASSIGN(RewriteFilter); 00152 }; 00153 00154 } 00155 00156 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_REWRITE_FILTER_H_