Page Speed Optimization Libraries
1.5.27.2
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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_