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DynamicDispatchVisitor.php
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DynamicDispatchVisitor.php
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<?php
/**
* This file is part of the Cubiche package.
*
* Copyright (c) Cubiche
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Cubiche\Core\Visitor;
/**
* Abstract Dynamic Dispatch Visitor Class.
*
* @author Karel Osorio Ramírez <[email protected]>
*/
abstract class DynamicDispatchVisitor implements DynamicDispatchVisitorInterface
{
/**
* @var \ReflectionMethod[]
*/
private $visitorMethods = null;
/**
* @var \ReflectionMethod[]
*/
private $handlerMethods = array();
/**
* @var ResolverVisitorMethodInterface
*/
protected $resolver;
/**
* @param ResolverVisitorMethodInterface $resolver
*/
public function __construct(ResolverVisitorMethodInterface $resolver = null)
{
$this->resolver = $resolver === null ? new ResolverVisitorMethod() : $resolver;
}
/**
* {@inheritdoc}
*/
public function canHandlerVisitee(VisiteeInterface $visitee)
{
return $this->handlerMethod($visitee) !== null;
}
/**
* {@inheritdoc}
*/
public function visit(VisiteeInterface $visitee)
{
return $this->visitWith($visitee, \func_get_args());
}
/**
* @param VisiteeInterface $visitee
* @param array $args
*
* @return mixed
*/
protected function visitWith(VisiteeInterface $visitee, array $args)
{
$method = $this->handlerMethod($visitee);
if ($method !== null) {
return $method->invokeArgs($this, $args);
}
throw $this->notSupportedVisiteeException($visitee);
}
/**
* @param VisiteeInterface $visitee
*
* @return \LogicException
*/
protected function notSupportedVisiteeException(VisiteeInterface $visitee)
{
return new \LogicException(
\sprintf('The %s visitee is not supported by %s visitor', \get_class($visitee), static::class)
);
}
/**
* @param VisiteeInterface $visitee
*
* @return \ReflectionMethod|null
*/
private function handlerMethod(VisiteeInterface $visitee)
{
$class = new \ReflectionClass(\get_class($visitee));
if (isset($this->handlerMethods[$class->name])) {
return $this->handlerMethods[$class->name];
}
if ($this->visitorMethods === null) {
$this->visitorMethods = $this->visitorMethods();
}
return $this->findHandlerMethod($class);
}
/**
* @param \ReflectionClass $class
*
* @return \ReflectionMethod|null
*/
private function findHandlerMethod(\ReflectionClass $class)
{
$current = $class;
while ($current !== false) {
if (isset($this->visitorMethods[$current->name])) {
$this->handlerMethods[$class->name] = $this->visitorMethods[$current->name];
return $this->handlerMethods[$class->name];
}
$current = $current->getParentClass();
}
return;
}
/**
* @return \ReflectionMethod[]
*/
private function visitorMethods()
{
$visitorMethods = array();
$reflection = new \ReflectionClass(static::class);
/** @var \ReflectionMethod $method */
foreach ($reflection->getMethods() as $method) {
if ($method->getName() !== 'visit') {
$visiteeClass = $this->resolver->resolveVisiteeClass($method);
if ($visiteeClass !== null) {
$visitorMethods[$visiteeClass->getName()] = $method;
}
}
}
return $visitorMethods;
}
}