JDATABASE::JDatabaseObjectIterator< T > Class Template Reference

Object iteration from database. More...

#include <JDatabaseObjectIterator.hh>

Inheritance diagram for JDATABASE::JDatabaseObjectIterator< T >:

Public Types
typedef JObjectIterator< T >::pointer_type	pointer_type

Public Member Functions
	JDatabaseObjectIterator (const JSelector &selection)
	Constructor. More...
	JDatabaseObjectIterator (const std::string &query, const JSelector &selection)
	Constructor. More...
	~JDatabaseObjectIterator ()
	Destructor. More...
virtual bool	setObject (T &object) override
	Set object. More...
virtual bool	hasNext () override
	Check availability of next element. More...
virtual const pointer_type &	next () override
	Get next element. More...
virtual skip_type	skip (const skip_type ns)
	Skip items. More...

Protected Attributes
T	object
	object More...
bool	has_next
	status More...

Private Attributes
ResultSet &	rs
pointer_type	ps

Detailed Description

template<class T>
class JDATABASE::JDatabaseObjectIterator< T >

Object iteration from database.

This class implements the JLANG::JObjectIterator interface.

Definition at line 52 of file JDatabaseObjectIterator.hh.

Member Typedef Documentation

pointer_type

template<class T >

typedef JObjectIterator<T>::pointer_type JLANG::JAbstractObjectIterator< T >::pointer_type

inherited

Definition at line 39 of file JAbstractObjectIterator.hh.

Constructor & Destructor Documentation

JDatabaseObjectIterator() [1/2]

template<class T >

JDATABASE::JDatabaseObjectIterator< T >::JDatabaseObjectIterator ( const JSelector &  selection )

inline

Constructor.

Parameters

selection

selection

Definition at line 61 of file JDatabaseObjectIterator.hh.

                                                        :
      rs(getResultSet(getTable<T>(), selection))
    {
      JDBReader<T>::set(selection);
    }

JDatabaseObjectIterator() [2/2]

template<class T >

JDATABASE::JDatabaseObjectIterator< T >::JDatabaseObjectIterator ( const std::string &  query, const JSelector &  selection  )

inline

Constructor.

This constructor is used to select a table by name.

Parameters

query	query / table name
selection	selection

Definition at line 76 of file JDatabaseObjectIterator.hh.

                                                                                :
      rs(query == getTable<T>() ? getResultSet(query, selection) : JNullResultSet::getInstance())
    {
      JDBReader<T>::set(selection);
    }

~JDatabaseObjectIterator()

template<class T >

JDATABASE::JDatabaseObjectIterator< T >::~JDatabaseObjectIterator ( )

inline

Destructor.

Definition at line 86 of file JDatabaseObjectIterator.hh.

    {
      //rs.Close();
    }

Member Function Documentation

setObject()

template<class T >

virtual bool JDATABASE::JDatabaseObjectIterator< T >::setObject ( T &  object )

inlineoverridevirtual

Set object.

Parameters

object

reference to object to be set

Returns

true if set; else false

Implements JLANG::JAbstractObjectIterator< T >.

Definition at line 98 of file JDatabaseObjectIterator.hh.

    {
      return (rs >> object);
    }

hasNext()

template<class T >

virtual bool JLANG::JAbstractObjectIterator< T >::hasNext ( )

inlineoverridevirtualinherited

Check availability of next element.

Returns

true if the iteration has more elements; else false

Implements JLANG::JObjectIterator< T >.

Definition at line 56 of file JAbstractObjectIterator.hh.

    {
      if (!has_next) {
        has_next = this->setObject(object);
      }
 
      return has_next;
    }

next()

template<class T >

virtual const pointer_type& JLANG::JAbstractObjectIterator< T >::next ( )

inlineoverridevirtualinherited

Get next element.

Returns

pointer to element

Implements JLANG::JObjectIterator< T >.

Definition at line 71 of file JAbstractObjectIterator.hh.

    {
      if (has_next)
        ps.reset(&this->object);
      else
        ps.reset(NULL);
 
      has_next = false;
      
      return ps;
    }

skip()

template<class T >

virtual skip_type JLANG::JObjectIterator< T >::skip ( const skip_type  ns )

inlinevirtualinherited

Skip items.

Parameters

ns	number of items to skip

Returns

number of items skipped

Reimplemented in JLANG::JSTDObjectIterator< T >, JLANG::JPipe< T >, JLANG::JPipe< JTail_t >, JLANG::JPipe< JHead_t >, and JLANG::JAbstractObjectReader< T >.

Definition at line 90 of file JObjectIterator.hh.

    {
      skip_type i = 0;
 
      for ( ; i != ns && hasNext(); ++i) {
        next();
      }
 
      return i;
    }

Member Data Documentation

rs

template<class T >

ResultSet& JDATABASE::JDatabaseObjectIterator< T >::rs

private

Definition at line 104 of file JDatabaseObjectIterator.hh.

object

template<class T >

T JLANG::JAbstractObjectIterator< T >::object

protectedinherited

object

Definition at line 34 of file JAbstractObjectIterator.hh.

has_next

template<class T >

bool JLANG::JAbstractObjectIterator< T >::has_next

protectedinherited

status

Definition at line 35 of file JAbstractObjectIterator.hh.

ps

template<class T >

pointer_type JLANG::JAbstractObjectIterator< T >::ps

privateinherited

Definition at line 84 of file JAbstractObjectIterator.hh.

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

• JDatabaseObjectIterator.hh