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_util.h" 00026 00027 namespace net_instaweb { 00028 00029 class NullStatisticsVariable : public Variable { 00030 public: 00031 NullStatisticsVariable() {} 00032 virtual ~NullStatisticsVariable(); 00033 virtual int Get() const { return 0; } 00034 virtual void Set(int value) { } 00035 virtual int64 Get64() const { return 0; } 00036 00037 private: 00038 DISALLOW_COPY_AND_ASSIGN(NullStatisticsVariable); 00039 }; 00040 00042 class NullStatistics : public ScalarStatisticsTemplate<NullStatisticsVariable> { 00043 public: 00044 static const int kNotFound; 00045 00046 NullStatistics() { } 00047 virtual ~NullStatistics(); 00048 00049 protected: 00050 virtual NullStatisticsVariable* NewVariable(const StringPiece& name, 00051 int index); 00052 00053 private: 00054 DISALLOW_COPY_AND_ASSIGN(NullStatistics); 00055 }; 00056 00057 } 00058 00059 #endif ///< NET_INSTAWEB_UTIL_PUBLIC_NULL_STATISTICS_H_