null_statistics.h

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/*
 * Copyright 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http:///www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#ifndef PAGESPEED_KERNEL_BASE_NULL_STATISTICS_H_
#define PAGESPEED_KERNEL_BASE_NULL_STATISTICS_H_

#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/statistics.h"
#include "pagespeed/kernel/base/statistics_template.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"

namespace net_instaweb {

class NullStatisticsVariable {
 public:
  NullStatisticsVariable(StringPiece name, Statistics* statistics) {}
  ~NullStatisticsVariable() {}
  void Set(int64 value) { }
  int64 Get() const { return 0; }
  int64 AddHelper(int64 delta) const { return 0; }
  StringPiece GetName() const { return StringPiece(); }

 private:
  
};

class NullStatistics : public ScalarStatisticsTemplate<NullStatisticsVariable> {
 public:
  NullStatistics();
  virtual ~NullStatistics();

  virtual CountHistogram* NewHistogram(StringPiece name);

 private:
  
};

}  

#endif