Auxiliary class to read object with ROOT dictionary from database. More...

#include <JDBReader.hh>

Inheritance diagram for JDATABASE::JDBReader< T >:

Public Types
typedef T	data_type

Public Member Functions
	JDBReader ()
	Default constructor.

const T &	operator() (ResultSet &rs)
	Read object with ROOT dictionary from result set.

const JRootDictionary_t &	getDictionary () const
	Get dictionary.

template<class T >
JRootReader &	get (T &object)
	Read object according equation format.

JRootReader &	get (const JRootReadableClass &cls)
	Read ROOT class according equation format.

template<class T >
JRootReader &	getObject (T &object)
	Read object.

JRootReader &	getObject (const JRootReadableClass &cls)
	Read ROOT class.

JRootReader &	getObject (JRootReadableClass &cls)
	Read ROOT class.

Static Public Member Functions
static void	reset ()
	Reset internal lookup table and default value.

static void	set (const std::vector< Selector > &selection)
	Set default value corresponding to given selection.

static data_type &	getInstance ()
	Get unique instance of template class.

Private Member Functions
template<class T >
JRootReader &	getObject (T &object, const JBool< true > &option)
	Read object.

template<class T >
JRootReader &	getObject (T &object, const JBool< false > &option)
	Read object.

template<class JElement_t , class JAllocator_t >
JRootReader &	getObject (std::vector< JElement_t, JAllocator_t > &object, const JBool< false > &option)
	Read object.

Private Attributes
T	object
	internal value

T	value
	default value

std::vector< JROOT::JRootReadableClass >	columns
	field count -> data member

const JRootDictionary_t &	dictionary

std::ios &	__from

std::ios &	__to

Detailed Description

template<class T>
struct JDATABASE::JDBReader< T >

Auxiliary class to read object with ROOT dictionary from database.

The names of the table columns are one-to-one mapped to the names of the data members of the corresponding data structure using the corresponding ROOT dictionary.
For this, all special characters (JDATABASE::SPECIAL_CHARACTERS) are removed from the column names.
The static method JDBReader::set can be used to a priori assign default values to those data members that are defined by the selector used in the query.
Note that the list of column names associated to the template parameter is considered to be permanent.
If not, the static method JDBReader::reset should be called before the next read operation.

Definition at line 94 of file JDBReader.hh.

Member Typedef Documentation

◆ data_type

template<class T >

T JLANG::JSingleton< T >::data_type

inherited

Definition at line 20 of file JSingleton.hh.

Constructor & Destructor Documentation

◆ JDBReader()

template<class T >

JDATABASE::JDBReader< T >::JDBReader ( )

inline

Default constructor.

Definition at line 101 of file JDBReader.hh.

                :
      JRootReader(JLANG::null, JLANG::JEquationParameters(), JDBDictionary::getInstance())
    {}

Member Function Documentation

◆ reset()

template<class T >

static void JDATABASE::JDBReader< T >::reset ( )

inlinestatic

Reset internal lookup table and default value.

Definition at line 109 of file JDBReader.hh.

    {
      JDBReader<T>::getInstance().columns.clear();
 
      JDBReader<T>::getInstance().value = T();
    }

◆ set()

template<class T >

static void JDATABASE::JDBReader< T >::set ( const std::vector< Selector > & selection )

inlinestatic

Set default value corresponding to given selection.

Parameters

selection selection

Definition at line 122 of file JDBReader.hh.

    {
      selection >> JDBReader<T>::getInstance().value;
    }

◆ operator()()

template<class T >

const T & JDATABASE::JDBReader< T >::operator() ( ResultSet & rs )

inline

Read object with ROOT dictionary from result set.

Parameters

rs	result set

Returns: object

Definition at line 134 of file JDBReader.hh.

    {
      using namespace std;
      using namespace JPP;
 
      object = value;
 
      if (columns.empty()) {
 
        JRootReadableClass cls(object);
 
        for (size_t i = 0; i != rs.FieldCount(); ++i) {
 
          string parameter = rs.FieldName(i);
 
          for (string::const_iterator i = SPECIAL_CHARACTERS.begin(); i != SPECIAL_CHARACTERS.end(); ++i) {
            for (string::size_type pos; (pos = parameter.find(*i)) != string::npos; ) {
              parameter.erase(pos);
            }
          }
        
          columns.push_back(cls.find(parameter.c_str()));
        }
      }
 
      for (unsigned int i = 0; i != rs.FieldCount(); ++i) {
 
        if (columns[i].is_valid()) {     
 
          JRedirectString redirect(*this, rs.GetString(i));
      
          this->getObject(columns[i]);
        }
      }
 
      return object;
    }

◆ getDictionary()

const JRootDictionary_t & JROOT::JRootReader::getDictionary ( ) const

inlineinherited

Get dictionary.

Returns: dictionary

Definition at line 87 of file JRootStreamer.hh.

    {
      return dictionary;
    }

◆ get() [1/2]

template<class T >

JRootReader & JROOT::JRootReader::get ( T & object )

inlineinherited

Read object according equation format.

Parameters

object object

Returns: this ROOT reader

Definition at line 100 of file JRootStreamer.hh.

    {
      return this->get(JRootReadableClass(object));
    }

◆ get() [2/2]

JRootReader & JROOT::JRootReader::get ( const JRootReadableClass & cls )

inlineinherited

Read ROOT class according equation format.

Parameters

cls	ROOT class

Returns: this ROOT reader

Definition at line 112 of file JRootStreamer.hh.

    {
      using namespace std;
      using namespace JPP;
 
      if (cls.is_valid()) {
 
        const JEquationFacet& facet = use_facet<JEquationFacet>(this->getloc());
        
        for (JEquation equation; *this >> equation; ) {
 
          const JRootReadableClass abc = cls.find(equation.getKey().c_str());
 
          bool status = abc.is_valid();
          
          if (status) {
          
            JRedirectString redirect(*this, equation.getValue());
          
            if      (facet.isDivision (equation.getSeparator()))
              this->get(abc);
            else if (facet.isSeparator(equation.getSeparator())) 
              this->getObject(abc);
            else
              status = false;
            
            status &= (!this->fail() || this->eof());
          }
 
          if (!status) {
            THROW(JException, "Error parsing: " << equation);
          }
        }
      }
 
      return *this;
    }

◆ getObject() [1/6]

template<class T >

JRootReader & JROOT::JRootReader::getObject ( T & object )

inlineinherited

Read object.

Parameters

object object

Returns: this ROOT reader

Definition at line 158 of file JRootStreamer.hh.

    {
      return this->getObject(object, JBool<JStreamAvailable<T>::has_istream>());
    }

◆ getObject() [2/6]

JRootReader & JROOT::JRootReader::getObject ( const JRootReadableClass & cls )

inlineinherited

Read ROOT class.

Parameters

cls	ROOT class

Returns: this ROOT reader

Definition at line 170 of file JRootStreamer.hh.

    {
      if (cls.is_valid()) {
 
        JRootDictionary_t::const_iterator i = this->getDictionary().find(cls.getTypename());
 
        if (i != this->getDictionary().end()) {
 
          i->second->getObject(*this, cls.getAddress());
          
        } else if (cls.getClass() != NULL) {
          
          if (cls.getClass()->GetListOfBases() != NULL) {
 
            std::unique_ptr<TIterator> i(cls.getClass()->GetListOfBases()->MakeIterator());
          
            for (const TBaseClass* p; (p = (const TBaseClass*) i->Next()) != NULL && (bool) (*this); ) {
              this->getObject(cls.get(*p));
            }
          }
          
          if (cls.getClass()->GetListOfDataMembers() != NULL) {
 
            std::unique_ptr<TIterator> i(cls.getClass()->GetListOfDataMembers()->MakeIterator());
          
            for (const TDataMember* p; (p = (const TDataMember*) i->Next()) != NULL && (bool) (*this); ) {
              this->getObject(cls.get(*p));
            }
          }
        }
      }
 
      return *this;
    }

◆ getObject() [3/6]

JRootReader & JROOT::JRootReader::getObject ( JRootReadableClass & cls )

inlineinherited

Read ROOT class.

Parameters

cls	ROOT class

Returns: this ROOT reader

Definition at line 212 of file JRootStreamer.hh.

    {
      return getObject(const_cast<const JRootReadableClass&>(cls));
    }

◆ getObject() [4/6]

template<class T >

JRootReader & JROOT::JRootReader::getObject	(	T &	object,
		const JBool< true > &	option )

inlineprivateinherited

Read object.

Parameters

object	object
option	true

Returns: this ROOT reader

Definition at line 226 of file JRootStreamer.hh.

    {
      *this >> object;
 
      return *this;
    }

◆ getObject() [5/6]

template<class T >

JRootReader & JROOT::JRootReader::getObject	(	T &	object,
		const JBool< false > &	option )

inlineprivateinherited

Read object.

Parameters

object	object
option	false

Returns: this ROOT reader

Definition at line 242 of file JRootStreamer.hh.

    {
      return this->getObject(JRootReadableClass(object));
    }

◆ getObject() [6/6]

template<class JElement_t , class JAllocator_t >

JRootReader & JROOT::JRootReader::getObject	(	std::vector< JElement_t, JAllocator_t > &	object,
		const JBool< false > &	option )

inlineprivateinherited

Read object.

Parameters

object	object
option	false

Returns: this ROOT reader

Definition at line 256 of file JRootStreamer.hh.

    {
      int n = 0;
 
      this->getObject(n);
 
      for (JElement_t element; n != 0 && this->getObject(element); --n) {
        object.push_back(element);
      }
 
      return *this;
    }

◆ getInstance()

template<class T >

static data_type & JLANG::JSingleton< T >::getInstance ( )

inlinestaticinherited

Get unique instance of template class.

Returns: object

Definition at line 27 of file JSingleton.hh.

    {
      static data_type value;
 
      return value;
    }

Member Data Documentation

◆ object

template<class T >

T JDATABASE::JDBReader< T >::object

private

internal value

Definition at line 173 of file JDBReader.hh.

◆ value

template<class T >

T JDATABASE::JDBReader< T >::value

private

default value

Definition at line 174 of file JDBReader.hh.

◆ columns

template<class T >

std::vector<JROOT::JRootReadableClass> JDATABASE::JDBReader< T >::columns

private

field count -> data member

Definition at line 176 of file JDBReader.hh.

◆ dictionary

const JRootDictionary_t& JROOT::JRootReader::dictionary

privateinherited

Definition at line 270 of file JRootStreamer.hh.

◆ __from

std::ios& JLANG::JStreamState::__from

privateinherited

Definition at line 67 of file JStreamState.hh.

◆ __to

std::ios& JLANG::JStreamState::__to

privateinherited

Definition at line 68 of file JStreamState.hh.

The documentation for this struct was generated from the following file:

JDBReader.hh

Public Types

Public Member Functions

Static Public Member Functions

Private Member Functions

Private Attributes

Detailed Description

Member Typedef Documentation

◆ data_type

Constructor & Destructor Documentation

◆ JDBReader()

Member Function Documentation

◆ reset()

◆ set()

◆ operator()()

◆ getDictionary()

◆ get() [1/2]

◆ get() [2/2]

◆ getObject() [1/6]

◆ getObject() [2/6]

◆ getObject() [3/6]

◆ getObject() [4/6]

◆ getObject() [5/6]

◆ getObject() [6/6]

◆ getInstance()

Member Data Documentation

◆ object

◆ value

◆ columns

◆ dictionary

◆ __from

◆ __to