Page Speed Optimization Libraries  1.2.24.1
net/instaweb/rewriter/public/rewrite_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_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.h"
00024 #include "net/instaweb/rewriter/public/resource_slot.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 OutputResource;
00032 class RewriteContext;
00033 class RewriteDriver;
00034 class UrlSegmentEncoder;
00035 
00036 class RewriteFilter : public CommonFilter {
00037  public:
00038   explicit RewriteFilter(RewriteDriver* driver)
00039       : CommonFilter(driver) {
00040   }
00041   virtual ~RewriteFilter();
00042 
00043   virtual const char* id() const = 0;
00044 
00049   virtual void DetermineEnabled();
00050 
00053   ResourcePtr CreateInputResourceFromOutputResource(
00054       OutputResource* output_resource);
00055 
00060   virtual const UrlSegmentEncoder* encoder() const;
00061 
00068   virtual bool ComputeOnTheFly() const;
00069 
00073   virtual RewriteContext* MakeRewriteContext();
00074 
00078   virtual RewriteContext* MakeNestedRewriteContext(
00079       RewriteContext* parent, const ResourceSlotPtr& slot);
00080 
00093   static StringPiece GetCharsetForScript(const Resource* script,
00094                                          const StringPiece attribute_charset,
00095                                          const StringPiece enclosing_charset);
00096 
00109   static GoogleString GetCharsetForStylesheet(
00110       const Resource* stylesheet,
00111       const StringPiece attribute_charset,
00112       const StringPiece enclosing_charset);
00113 
00116   virtual void LogFilterModifiedContent();
00117 
00118  private:
00123   virtual bool UsesPropertyCacheDomCohort() const { return false; }
00124 
00125   DISALLOW_COPY_AND_ASSIGN(RewriteFilter);
00126 };
00127 
00128 }  
00129 
00130 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_REWRITE_FILTER_H_
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