class.ilBuddySystemRelationStateFactory.php

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<?php
 
declare(strict_types=1);
 
class ilBuddySystemRelationStateFactory
{
    protected static ?self $instance = null;
    protected static ?array $validStates = null;
 
    public function __construct(protected ilLanguage $lng)
    {
    }
 
    public static function getInstance(?ilLanguage $lng = null): self
    {
        global $DIC;
 
        if (null === self::$instance) {
            $lng ??= $DIC['lng'];
 
            self::$instance = new self($lng);
        }
 
        return self::$instance;
    }
 
    public function reset(): void
    {
        self::$instance = null;
    }
 
    public function getValidStates(): array
    {
        return self::$validStates ?? (self::$validStates = [
            new ilBuddySystemUnlinkedRelationState(),
            new ilBuddySystemRequestedRelationState(),
            new ilBuddySystemIgnoredRequestRelationState(),
            new ilBuddySystemLinkedRelationState(),
        ]);
    }
 
    public function getInitialState(): ilBuddySystemRelationState
    {
        foreach ($this->getValidStates() as $state) {
            if ($state->isInitial()) {
                return $state;
            }
        }
 
        throw new ilBuddySystemException('Could not find an initial state class');
    }
 
    public function getTableFilterStateMapper(ilBuddySystemRelationState $state): ilBuddySystemRelationStateTableFilterMapper
    {
        $stateClass = $state::class;
        $class = $stateClass . 'TableFilterMapper';
 
        return new $class($this->lng, $state);
    }
 
    public function getStateButtonRendererByOwnerAndRelation(
        int $ownerId,
        ilBuddySystemRelation $relation
    ): ilBuddySystemRelationStateButtonRenderer {
        $stateClass = $relation->getState()::class;
        $class = $stateClass . 'ButtonRenderer';
 
        return new $class($ownerId, $relation);
    }
}