Page Speed Optimization Libraries  1.3.25.1
net/instaweb/util/public/null_statistics.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_UTIL_PUBLIC_NULL_STATISTICS_H_
00020 #define NET_INSTAWEB_UTIL_PUBLIC_NULL_STATISTICS_H_
00021 
00022 #include "net/instaweb/util/public/basictypes.h"
00023 #include "net/instaweb/util/public/statistics.h"
00024 #include "net/instaweb/util/public/statistics_template.h"
00025 #include "net/instaweb/util/public/string.h"
00026 #include "net/instaweb/util/public/string_util.h"
00027 
00028 namespace net_instaweb {
00029 
00030 class NullStatisticsVariable : public Variable {
00031  public:
00032   NullStatisticsVariable() {}
00033   virtual ~NullStatisticsVariable();
00034   virtual void Set(int64 value) { }
00035   virtual int64 Get() const { return 0; }
00036   virtual StringPiece GetName() const { return StringPiece(NULL); }
00037 
00038  private:
00039   DISALLOW_COPY_AND_ASSIGN(NullStatisticsVariable);
00040 };
00041 
00043 class NullStatistics : public ScalarStatisticsTemplate<NullStatisticsVariable> {
00044  public:
00045   static const int kNotFound;
00046 
00047   NullStatistics() { }
00048   virtual ~NullStatistics();
00049 
00050  protected:
00051   virtual NullStatisticsVariable* NewVariable(const StringPiece& name,
00052                                               int index);
00053 
00054  private:
00055   DISALLOW_COPY_AND_ASSIGN(NullStatistics);
00056 };
00057 
00058 }  
00059 
00060 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_NULL_STATISTICS_H_
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