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<?php
/**
* Class that defers a slow string generation until the string is actually needed.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* @since 1.25
*/
class DeferredStringifier {
/** @var callable Callback used for result string generation */
private $callback;
/** @var array */
private $params;
/** @var string */
private $result;
/**
* @param callable $callback Callback that gets called by __toString
* @param mixed $param,... Parameters to the callback
*/
public function __construct( $callback /*...*/ ) {
$this->params = func_get_args();
array_shift( $this->params );
$this->callback = $callback;
}
/**
* Get the string generated from the callback
*
* @return string
*/
public function __toString() {
if ( $this->result === null ) {
$this->result = call_user_func_array( $this->callback, $this->params );
}
return $this->result;
}
}
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