SelectStatement Class Reference

#include <SelectStatement.h>

Inheritance diagram for SelectStatement:

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Collaboration diagram for SelectStatement:

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List of all members.

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Detailed Description

Class of a selection statement.

A select statement can either contain

• a string e.g. for refining an SQL statement
• a function object, which will be called back in order to refine a selection. This happens in calling sequences like the following:

bool MySelect::operator()(IValueLocator* l) { float px, py, pz; if ( l->get("PX",px) && l->get("PY",py) && l->get("PZ",pz) ) { float mom = sqrt(px*px+py*py+pz*pz); return mom > 100.0 * GeV; } return false; }

if "true" is returned, the object will be loaded completely.

History: +---------+----------------------------------------------+--------+ | Date | Comment | Who | +---------+----------------------------------------------+--------+ | 21/10/99| Initial version. | MF | +---------+----------------------------------------------+--------+ Author: M.Frank Version: 1.0

Definition at line 46 of file SelectStatement.h.

Public Member Functions
	SelectStatement (const std::string &s, long typ)
	Standard Constructor initializing select string.
	SelectStatement (const std::string &s)
	Standard Constructor initializing select string.
	SelectStatement ()
	Standard Constructor initializing function call.
virtual	~SelectStatement ()
	Standard Destructor.
virtual unsigned long	addRef ()
	Increase reference count.
virtual unsigned long	release ()
	Decrease reference count (and eventually delete).
virtual StatusCode	queryInterface (const InterfaceID &riid, void **ppvInterface)
	Query interface.
long	type () const
	Access the type of the object.
const std::string &	criteria () const
	Access the selection string.
void	setCriteria (const std::string &crit)
	Set the type.
void	setActive (bool flag=true)
	Change activity flag.
bool	isActive () const
	Check if selection is active.
virtual bool	operator() (void *)
	Stupid default implementation.
Protected Attributes
std::string	m_select
	Select string.
long	m_refCount
	Reference counter.
bool	m_isActive
	Activation flag.
long	m_type
	Type identifier.

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Constructor & Destructor Documentation

SelectStatement::SelectStatement	(	const std::string &	s,
		long	typ
	)			[inline, explicit]

Standard Constructor initializing select string.

Definition at line 49 of file SelectStatement.h.

  : m_select(s), m_refCount(0), m_isActive(false), m_type(typ)
  {
  }

SelectStatement::SelectStatement

(

const std::string &

s

)

[inline, explicit]

Standard Constructor initializing select string.

Definition at line 54 of file SelectStatement.h.

  : m_select(s), m_refCount(0), m_isActive(false), m_type(STRING)
  {
  }

SelectStatement::SelectStatement

(

)

[inline, explicit]

Standard Constructor initializing function call.

Definition at line 59 of file SelectStatement.h.

  : m_refCount(0), m_isActive(false), m_type(FUNCTION)
  {
  }

virtual SelectStatement::~SelectStatement

(

)

[inline, virtual]

Standard Destructor.

Definition at line 64 of file SelectStatement.h.

                              {
  }

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Member Function Documentation

virtual unsigned long SelectStatement::addRef

(

)

[inline, virtual]

Increase reference count.

Implements IInterface.

Definition at line 67 of file SelectStatement.h.

                                    {
    return ++m_refCount;
  }

virtual unsigned long SelectStatement::release

(

)

[inline, virtual]

Decrease reference count (and eventually delete).

Implements IInterface.

Definition at line 71 of file SelectStatement.h.

                                      {
    long cnt = --m_refCount;
    if ( cnt <= 0 )   {
      delete this;
    }
    return cnt;
  }

virtual StatusCode SelectStatement::queryInterface	(	const InterfaceID &	riid,
		void **	ppvInterface
	)			[inline, virtual]

Query interface.

Implements IInterface.

Definition at line 79 of file SelectStatement.h.

                                                                                     {
    if ( riid == IID_IInterface )   {
      *ppvInterface = (IInterface*)this;
    }
    if ( riid == IID_ISelectStatement )   {
      *ppvInterface = (ISelectStatement*)this;
    }
    else    {
      *ppvInterface = 0;
      return NO_INTERFACE;
    }
    addRef();
    return StatusCode::SUCCESS;
  }

long SelectStatement::type

(

)

const [inline, virtual]

Access the type of the object.

Implements ISelectStatement.

Definition at line 94 of file SelectStatement.h.

                        {
    return m_type;
  }

const std::string& SelectStatement::criteria

(

)

const [inline, virtual]

Access the selection string.

Implements ISelectStatement.

Definition at line 98 of file SelectStatement.h.

                                        {
    return m_select;
  }

void SelectStatement::setCriteria

(

const std::string &

crit

)

[inline, virtual]

Set the type.

Implements ISelectStatement.

Definition at line 102 of file SelectStatement.h.

                                             {
    m_select = crit;
    (m_select.length() > 0) ? m_type |= STRING : m_type &= ~STRING;
  }

void SelectStatement::setActive

(

bool

flag = true

)

[inline, virtual]

Change activity flag.

Implements ISelectStatement.

Definition at line 107 of file SelectStatement.h.

                                     {
    m_isActive = flag;
  }

bool SelectStatement::isActive

(

)

const [inline, virtual]

Check if selection is active.

Implements ISelectStatement.

Definition at line 111 of file SelectStatement.h.

                            {
    return m_isActive;
  }

virtual bool SelectStatement::operator()

(

void *

)

[inline, virtual]

Stupid default implementation.

Implements ISelectStatement.

Reimplemented in NTuple::Selector.

Definition at line 115 of file SelectStatement.h.

                                              {
    return true;
  }

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Member Data Documentation

std::string SelectStatement::m_select [protected]

Select string.

Definition at line 120 of file SelectStatement.h.

long SelectStatement::m_refCount [protected]

Reference counter.

Definition at line 122 of file SelectStatement.h.

bool SelectStatement::m_isActive [protected]

Activation flag.

Definition at line 124 of file SelectStatement.h.

long SelectStatement::m_type [protected]

Type identifier.

Definition at line 126 of file SelectStatement.h.

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

• /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v20r4/GaudiKernel/GaudiKernel/SelectStatement.h