Latest snippets tagged pattern
http://snippets.prendreuncafe.com/snippets/tagged/pattern/order_by/date
2006-12-26T12:53:53Z
Symfony
noreply@symfony-project.com
Multiton en PHP5
2006-12-26T12:53:53Z
30
[code]
class Multiton
{
private $instances = array();
public function getInstance($var1, $var2, $var3)
{
$uid = md5((string)$var1.(string)$var2.(string)$var3);
if (!isset(self::$instances[$uid]))
{
self::$instances[$uid] = new Multiton($var1, $var2, $var3);
}
return self::$instances[$uid];
}
}
[/code]
Le pattern Strategy en PHP5
2006-11-07T21:56:03Z
17
[code]
<?php
interface IStrategy
{
function filter( $record );
}
class FindAfterStrategy implements IStrategy
{
private $_name;
public function __construct( $name )
{
$this->_name = $name;
}
public function filter( $record )
{
return strcmp( $this->_name, $record ) <= 0;
}
}
class RandomStrategy implements IStrategy
{
public function filter( $record )
{
return rand( 0, 1 ) >= 0.5;
}
}
class UserList
{
private $_list = array();
public function __construct( $names )
{
if ( $names != null )
{
foreach( $names as $name )
{
$this->_list []= $name;
}
}
}
public function add( $name )
{
$this->_list []= $name;
}
public function find( $filter )
{
$recs = array();
foreach( $this->_list as $user )
{
if ( $filter->filter( $user ) )
$recs []= $user;
}
return $recs;
}
}
$ul = new UserList( array( "Andy", "Jack", "Lori", "Megan" ) );
$f1 = $ul->find( new FindAfterStrategy( "J" ) );
print_r( $f1 );
$f2 = $ul->find( new RandomStrategy() );
print_r( $f2 );
?>
[/code]
Le pattern ChainOfCommands en PHP5
2006-11-07T21:54:35Z
16
[code]
<?php
interface ICommand
{
function onCommand( $name, $args );
}
class CommandChain
{
private $_commands = array();
public function addCommand( $cmd )
{
$this->_commands []= $cmd;
}
public function runCommand( $name, $args )
{
foreach( $this->_commands as $cmd )
{
if ( $cmd->onCommand( $name, $args ) )
return;
}
}
}
class UserCommand implements ICommand
{
public function onCommand( $name, $args )
{
if ( $name != 'addUser' ) return false;
echo( "UserCommand handling 'addUser'\n" );
return true;
}
}
class MailCommand implements ICommand
{
public function onCommand( $name, $args )
{
if ( $name != 'mail' ) return false;
echo( "MailCommand handling 'mail'\n" );
return true;
}
}
$cc = new CommandChain();
$cc->addCommand( new UserCommand() );
$cc->addCommand( new MailCommand() );
$cc->runCommand( 'addUser', null );
$cc->runCommand( 'mail', null );
?>
[/code]
Le pattern Observer en PHP5
2006-11-07T21:53:28Z
15
[code]
<?php
interface IObserver
{
function onChanged( $sender, $args );
}
interface IObservable
{
function addObserver( $observer );
}
class UserList implements IObservable
{
private $_observers = array();
public function addCustomer( $name )
{
foreach( $this->_observers as $obs )
$obs->onChanged( $this, $name );
}
public function addObserver( $observer )
{
$this->_observers []= $observer;
}
}
class UserListLogger implements IObserver
{
public function onChanged( $sender, $args )
{
echo( "'$args' added to user list\n" );
}
}
$ul = new UserList();
$ul->addObserver( new UserListLogger() );
$ul->addCustomer( "Jack" );
?>
[/code]
Le pattern Factory en PHP5
2006-11-07T21:50:28Z
14
[code]
<?php
interface IUser
{
function getName();
}
class User implements IUser
{
public static function Load( $id )
{
return new User( $id );
}
public static function Create( )
{
return new User( null );
}
public function __construct( $id ) { }
public function getName()
{
return "Jack";
}
}
$uo = User::Load( 1 );
echo( $uo->getName()."\n" );
?>
[/code]
Singleton en PHP5
2006-10-11T16:28:17Z
3
Instance unique d'un objet.
[code]
<?php
class Singleton
{
private static $_instance ;
private function __construct() { }
public static function GetInstance()
{
if (!isset(self::$_instance))
{
self::$_instance = new Singleton() ;
}
return self::$_instance;
}
}
?>
[/code]