nametable.h

Amis - A maximum entropy estimator 一个最大熵模型统计工具

#ifndef Amis_NameTable_h_

#define Amis_NameTable_h_

#include <amis/configure.h>
#include <amis/StringStream.h>
#include <amis/Feature.h>
#include <map>
#include <string>

AMIS_NAMESPACE_BEGIN

class NameTableBase {
public:
  NameTableBase() {}
  virtual ~NameTableBase() {}

  virtual std::string featureNameString( FeatureID id ) const = 0;
};

template < class Name = std::string >
class NameTable : public NameTableBase {
protected:
  std::map< FeatureID, Name > feature_name;
  std::map< Name, FeatureID > feature_id;

public:
  NameTable() {}
  virtual ~NameTable() {}

  int numFeatures() const { return feature_name.size(); }
  std::string featureNameString( FeatureID id ) const {
    OStringStream oss;
    oss << featureName( id );
    return oss.str();
  }
  const Name& featureName( FeatureID id ) const {
    typename std::map< FeatureID, Name >::const_iterator it = feature_name.find( id );
    if ( it == feature_name.end() ) {
      OStringStream oss;
      oss << "FeatureID " << id << " not found";
      throw IllegalFeatureError( oss.str() );
    }
    return it->second;
  }
  FeatureID featureID( const Name& name ) const {
    typename std::map< Name, FeatureID >::const_iterator it = feature_id.find( name );
    if ( it == feature_id.end() ) {
      OStringStream oss;
      oss << "Feature " << name << " not found";
      throw IllegalFeatureError( oss.str() );
    }
    return it->second;
  }

public:
  void registerNewFeature( const Name& name, FeatureID id ) {
    if ( feature_name.find( id ) != feature_name.end() ) {
      OStringStream oss;
      oss << "Feature ID " << id << " already exists";
      throw IllegalFeatureError( oss.str() );
    }
    if ( feature_id.find( name ) != feature_id.end() ) {
      OStringStream oss;
      oss << "Feature " << name << " already exists";
      throw IllegalFeatureError( oss.str() );
    }
    feature_name[ id ] = name;
    feature_id[ name ] = id;
  }
};

AMIS_NAMESPACE_END

#endif // Amis_NameTable_h_
// end of NameTable.h