ContextStack.php

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<?php

declare(strict_types=1);
namespace ILIAS\GlobalScreen\ScreenContext\Stack;

use ILIAS\GlobalScreen\ScreenContext\ScreenContext;
use LogicException;

class ContextStack
{
    protected $stack = [];

    public function push(ScreenContext $context) : void
    {
        if (in_array($context, $this->stack)) {
            throw new LogicException("A context can only be claimed once");
        }
        $this->stack[] = $context;
    }

    public function getLast() : ScreenContext
    {
        return end($this->stack);
    }

    public function getStack() : array
    {
        return $this->stack;
    }

    public function getStackAsArray() : array
    {
        $return = [];
        foreach ($this->stack as $item) {
            $return[] = $item->getUniqueContextIdentifier();
        }

        return $return;
    }
}