PathConditionsChecker.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\MetaData\Manipulator\Path;
 
use ILIAS\MetaData\Elements\ElementInterface;
use ILIAS\MetaData\Paths\Navigator\NavigatorFactoryInterface;
use ILIAS\MetaData\Paths\Navigator\NavigatorInterface;
use ILIAS\MetaData\Paths\PathInterface;
use ILIAS\MetaData\Paths\Steps\StepInterface;
 
class PathConditionsChecker implements PathConditionsCheckerInterface
{
    protected PathConditionsCollectionInterface $path_conditions_collection;
    protected NavigatorFactoryInterface $navigator_factory;
 
    public function __construct(
        PathConditionsCollectionInterface $path_conditions_collection,
        NavigatorFactoryInterface $navigator_factory
    ) {
        $this->path_conditions_collection = $path_conditions_collection;
        $this->navigator_factory = $navigator_factory;
    }
 
    public function getRootsThatMeetPathCondition(StepInterface $step, ElementInterface ...$roots): \Generator
    {
        $elements = [];
        foreach ($roots as $root) {
            if ($this->isPathConditionMet($step, $root)) {
                $elements[] = $root;
            }
        }
        yield from $elements;
    }
 
    public function allPathConditionsAreMet(StepInterface $step, ElementInterface ...$roots): bool
    {
        foreach ($roots as $root) {
            if (!$this->isPathConditionMet($step, $root)) {
                return false;
            }
        }
        return true;
    }
 
    public function atLeastOnePathConditionIsMet(StepInterface $step, ElementInterface ...$roots): bool
    {
        foreach ($roots as $root) {
            if ($this->isPathConditionMet($step, $root)) {
                return true;
            }
        }
        return false;
    }
 
    public function isPathConditionMet(StepInterface $step, ElementInterface $root): bool
    {
        $navigator = $this->navigator_factory->navigator(
            $condition_path = $this->path_conditions_collection->getConditionPathByStepName($step->name()),
            $root
        );
        while (!is_null($navigator)) {
            if (!$navigator->hasElements()) {
                return false;
            }
            $navigator = $navigator->nextStep();
        }
        return true;
    }
}