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chain.php
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chain.php
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<?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 ) )
{
echo "<br/>";
return;
} else {
echo "Command $name not found.<br/>";
return;
}
}
}
}
class UserCommand implements ICommand
{
public function onCommand( $name, $args )
{
if ( $name != 'addUser' ) return false;
echo( "UserCommand handling 'addUser'" );
return true;
}
}
class MailCommand implements ICommand
{
public function onCommand( $name, $args )
{
if ( $name != 'mail' ) return false;
echo( "MailCommand handling 'mail'" );
return true;
}
}
$cc = new CommandChain();
$cc->addCommand( new UserCommand() );
$cc->addCommand( new MailCommand() );
$cc->runCommand( 'addUser', null );
$cc->runCommand( 'deleteUser', null );
$cc->runCommand( 'mail', null );