Page Speed Optimization Libraries  1.3.25.1
net/instaweb/rewriter/public/javascript_library_identification.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  */
00017 
00018 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_JAVASCRIPT_LIBRARY_IDENTIFICATION_H_
00019 #define NET_INSTAWEB_REWRITER_PUBLIC_JAVASCRIPT_LIBRARY_IDENTIFICATION_H_
00020 
00021 #include <map>
00022 
00023 #include "net/instaweb/util/public/basictypes.h"
00024 #include "net/instaweb/util/public/string.h"
00025 #include "net/instaweb/util/public/string_util.h"
00026 
00027 namespace net_instaweb {
00028 
00034 class JavascriptLibraryIdentification {
00035  public:
00036   typedef uint64 SizeInBytes;
00037 
00038   static const int kNumHashChars = (126 + 5) / 6; 
00039 
00040   JavascriptLibraryIdentification() { }
00041   ~JavascriptLibraryIdentification();
00042 
00045   bool RegisterLibrary(
00046       SizeInBytes bytes, StringPiece md5_hash, StringPiece canonical_url);
00049   StringPiece Find(StringPiece minified_code) const;
00051   void Merge(const JavascriptLibraryIdentification& src);
00053   void AppendSignature(GoogleString* signature) const;
00054 
00055  private:
00056   class LibraryInfo;
00060   typedef GoogleString MD5Signature;
00061   typedef std::map<MD5Signature, GoogleString> MD5ToUrlMap;
00062   typedef std::map<SizeInBytes, MD5ToUrlMap> LibraryMap;
00063 
00064   LibraryMap libraries_;
00065 
00066   DISALLOW_COPY_AND_ASSIGN(JavascriptLibraryIdentification);
00067 };
00068 
00069 }  
00070 
00071 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_JAVASCRIPT_LIBRARY_IDENTIFICATION_H_
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