silverstripe-framework/control/injector/AopProxyService.php

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<?php
/**
* A class that proxies another, allowing various functionality to be
* injected.
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*
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* @package framework
* @subpackage injector
*/
class AopProxyService {
public $beforeCall = array();
public $afterCall = array();
public $proxied;
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/**
* Because we don't know exactly how the proxied class is usually called,
* provide a default constructor
*/
public function __construct() {
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}
public function __call($method, $args) {
if (method_exists($this->proxied, $method)) {
$continue = true;
$result = null;
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if (isset($this->beforeCall[$method])) {
$methods = $this->beforeCall[$method];
if (!is_array($methods)) {
$methods = array($methods);
}
foreach ($methods as $handler) {
$alternateReturn = null;
$proceed = $handler->beforeCall($this->proxied, $method, $args, $alternateReturn);
if ($proceed === false) {
$continue = false;
// if something is set in, use it
if ($alternateReturn) {
$result = $alternateReturn;
}
}
}
}
if ($continue) {
$result = call_user_func_array(array($this->proxied, $method), $args);
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if (isset($this->afterCall[$method])) {
$methods = $this->afterCall[$method];
if (!is_array($methods)) {
$methods = array($methods);
}
foreach ($methods as $handler) {
$return = $handler->afterCall($this->proxied, $method, $args, $result);
if (!is_null($return)) {
$result = $return;
}
}
}
}
return $result;
}
}
}