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<?php

declare(strict_types=1);

namespace Laminas\View\Helper;

use Laminas\View\Model\ModelInterface as Model;

/**
 * Helper for storing and retrieving the root and current view model
 *
 * @final
 */
class ViewModel extends AbstractHelper
{
    use DeprecatedAbstractHelperHierarchyTrait;

    /** @var Model|null */
    protected $current;

    /** @var Model|null */
    protected $root;

    /**
     * Set the current view model
     *
     * @return $this
     */
    public function setCurrent(Model $model)
    {
        $this->current = $model;
        return $this;
    }

    /**
     * Get the current view model
     *
     * @return Model|null
     */
    public function getCurrent()
    {
        return $this->current;
    }

    /**
     * Is a current view model composed?
     *
     * @return bool
     */
    public function hasCurrent()
    {
        return $this->current instanceof Model;
    }

    /**
     * Set the root view model
     *
     * @return $this
     */
    public function setRoot(Model $model)
    {
        $this->root = $model;
        return $this;
    }

    /**
     * Get the root view model
     *
     * @return Model|null
     */
    public function getRoot()
    {
        return $this->root;
    }

    /**
     * Is a root view model composed?
     *
     * @return bool
     */
    public function hasRoot()
    {
        return $this->root instanceof Model;
    }
}