| # Gaudi Framework, version v21r11 |

Home |  | Generated: 30 Sep 2010

# SelectStatement Class Reference

Class of a selection statement. More...

`#include <SelectStatement.h>`

Inheritance diagram for SelectStatement:
[legend]
Collaboration diagram for SelectStatement:
[legend]

List of all members.

## 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.
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.
bool | m_isActive
| Activation flag.
long | m_type
| Type identifier.

## 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.

## 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.

    00050   : m_select(s), m_isActive(false), m_type(typ)
    00051   {
    00052   }

SelectStatement::SelectStatement | ( | const std::string & | s | ) | `[inline, explicit]`

Standard Constructor initializing select string.

Definition at line 54 of file SelectStatement.h.

    00055   : m_select(s),m_isActive(false), m_type(STRING)
    00056   {
    00057   }

SelectStatement::SelectStatement | ( |  | ) | `[inline, explicit]`

Standard Constructor initializing function call.

Definition at line 59 of file SelectStatement.h.

    00060   : m_isActive(false), m_type(FUNCTION)
    00061   {
    00062   }

virtual SelectStatement::~SelectStatement | ( |  | ) | `[inline, virtual]`

Standard Destructor.

Definition at line 64 of file SelectStatement.h.

    00064                               {
    00065   }

## Member Function Documentation

long SelectStatement::type | ( |  | ) | const`[inline, virtual]`

Access the type of the object.

Implements ISelectStatement.

Definition at line 67 of file SelectStatement.h.

    00067                         {
    00068     return m_type;
    00069   }

const std::string& SelectStatement::criteria | ( |  | ) | const`[inline, virtual]`

Access the selection string.

Implements ISelectStatement.

Definition at line 71 of file SelectStatement.h.

    00071                                         {
    00072     return m_select;
    00073   }

void SelectStatement::setCriteria | ( | const std::string & | crit | ) | `[inline, virtual]`

Set the type.

Implements ISelectStatement.

Definition at line 75 of file SelectStatement.h.

    00075                                              {
    00076     m_select = crit;
    00077     (m_select.length() > 0) ? m_type |= STRING : m_type &= ~STRING;
    00078   }

void SelectStatement::setActive | ( | bool | flag = `true` | ) | `[inline, virtual]`

Change activity flag.

Implements ISelectStatement.

Definition at line 80 of file SelectStatement.h.

    00080                                      {
    00081     m_isActive = flag;
    00082   }

bool SelectStatement::isActive | ( |  | ) | const`[inline, virtual]`

Check if selection is active.

Implements ISelectStatement.

Definition at line 84 of file SelectStatement.h.

    00084                             {
    00085     return m_isActive;
    00086   }

virtual bool SelectStatement::operator() | ( | void * |  | ) | `[inline, virtual]`

Stupid default implementation.

Implements ISelectStatement.

Reimplemented in NTuple::Selector.

Definition at line 88 of file SelectStatement.h.

    00088                                               {
    00089     return true;
    00090   }

## Member Data Documentation

std::string SelectStatement::m_select`[protected]`

Select string.

Definition at line 93 of file SelectStatement.h.

bool SelectStatement::m_isActive`[protected]`

Activation flag.

Definition at line 95 of file SelectStatement.h.

long SelectStatement::m_type`[protected]`

Type identifier.

Definition at line 97 of file SelectStatement.h.

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

- /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v21r11/GaudiKernel/GaudiKernel/SelectStatement.h