FilterProvider.php

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<?php
namespace Magento\Cms\Model\Template;

class FilterProvider
{
    protected $_objectManager;

    protected $_pageFilter;

    protected $_blockFilter;

    protected $_instanceList;

    public function __construct(
        \Magento\Framework\ObjectManagerInterface $objectManager,
        $pageFilter = \Magento\Cms\Model\Template\Filter::class,
        $blockFilter = \Magento\Cms\Model\Template\Filter::class
    ) {
        $this->_objectManager = $objectManager;
        $this->_pageFilter = $pageFilter;
        $this->_blockFilter = $blockFilter;
    }

    protected function _getFilterInstance($instanceName)
    {
        if (!isset($this->_instanceList[$instanceName])) {
            $instance = $this->_objectManager->get($instanceName);

            if (!$instance instanceof \Magento\Framework\Filter\Template) {
                throw new \Exception('Template filter ' . $instanceName . ' does not implement required interface');
            }
            $this->_instanceList[$instanceName] = $instance;
        }

        return $this->_instanceList[$instanceName];
    }

    public function getBlockFilter()
    {
        return $this->_getFilterInstance($this->_blockFilter);
    }

    public function getPageFilter()
    {
        return $this->_getFilterInstance($this->_pageFilter);
    }
}