Source of file AllLinksProviderBase.php

<?php

namespace Sunnysideup\TemplateOverview\Api;

namespace Sunnysideup\TemplateOverview\Api;

use ReflectionClass;

use SilverStripe\CMS\Model\SiteTree;

use SilverStripe\Core\Config\Configurable;

use SilverStripe\Core\Extensible;

use SilverStripe\Core\Injector\Injectable;

use SilverStripe\Core\Injector\Injector;

use SilverStripe\ORM\DB;

abstract class AllLinksProviderBase

{

    use Extensible;

    use Injectable;

    use Configurable;

    protected $numberOfExamples = 1;

    private $listOfAllSiteTreeClassesCache = [];

    public function setNumberOfExamples($n): self

    {

        $this->numberOfExamples = $n;

        return $this;

    }

    public function getNumberOfExamples(): int

    {

        return $this->numberOfExamples;

    }

    /**

     * returns a list of all SiteTree Classes.

     *

     * @return array

     */

    public function getListOfAllClasses()

    {

        if (empty($this->listOfAllSiteTreeClassesCache)) {

            $siteTreeDetails = Injector::inst()->get(SiteTreeDetails::class);

            $list = $siteTreeDetails->ListOfAllClasses();

            foreach ($list as $page) {

                $this->listOfAllSiteTreeClassesCache[] = $page->ClassName;

            }

        }

        return $this->listOfAllSiteTreeClassesCache;

    }

    protected function isValidClass($class)

    {

        $obj = new ReflectionClass($class);

        return ! $obj->isAbstract();

    }

    /**

     * Takes an array, takes one item out, and returns new array.

     *

     * @param array  $array     array which will have an item taken out of it

     * @param string $exclusion Item to be taken out of $array

     *

     * @return array new array

     */

    protected function arrayExcept($array, $exclusion)

    {

        $newArray = $array;

        $count = count($newArray);

        for ($i = 0; $i < $count; ++$i) {

            if ($newArray[$i] === $exclusion) {

                unset($newArray[$i]);

            }

        }

        return $newArray;

    }

    protected function tableExists(string $table): bool

    {

        $tables = DB::table_list();

        return array_key_exists(strtolower($table), $tables);

    }

}