FilterList.php

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<?php
namespace Magento\Catalog\Model\Layer;

class FilterList
{
    const CATEGORY_FILTER   = 'category';
    const ATTRIBUTE_FILTER  = 'attribute';
    const PRICE_FILTER      = 'price';
    const DECIMAL_FILTER    = 'decimal';

    protected $objectManager;

    protected $filterableAttributes;

    protected $filterTypes = [
        self::CATEGORY_FILTER  => \Magento\Catalog\Model\Layer\Filter\Category::class,
        self::ATTRIBUTE_FILTER => \Magento\Catalog\Model\Layer\Filter\Attribute::class,
        self::PRICE_FILTER     => \Magento\Catalog\Model\Layer\Filter\Price::class,
        self::DECIMAL_FILTER   => \Magento\Catalog\Model\Layer\Filter\Decimal::class,
    ];

    protected $filters = [];

    public function __construct(
        \Magento\Framework\ObjectManagerInterface $objectManager,
        FilterableAttributeListInterface $filterableAttributes,
        array $filters = []
    ) {
        $this->objectManager = $objectManager;
        $this->filterableAttributes = $filterableAttributes;

        $this->filterTypes = array_merge($this->filterTypes, $filters);
    }

    public function getFilters(\Magento\Catalog\Model\Layer $layer)
    {
        if (!count($this->filters)) {
            $this->filters = [
                $this->objectManager->create($this->filterTypes[self::CATEGORY_FILTER], ['layer' => $layer]),
            ];
            foreach ($this->filterableAttributes->getList() as $attribute) {
                $this->filters[] = $this->createAttributeFilter($attribute, $layer);
            }
        }
        return $this->filters;
    }

    protected function createAttributeFilter(
        \Magento\Catalog\Model\ResourceModel\Eav\Attribute $attribute,
        \Magento\Catalog\Model\Layer $layer
    ) {
        $filterClassName = $this->getAttributeFilterClass($attribute);

        $filter = $this->objectManager->create(
            $filterClassName,
            ['data' => ['attribute_model' => $attribute], 'layer' => $layer]
        );
        return $filter;
    }

    protected function getAttributeFilterClass(\Magento\Catalog\Model\ResourceModel\Eav\Attribute $attribute)
    {
        $filterClassName = $this->filterTypes[self::ATTRIBUTE_FILTER];

        if ($attribute->getAttributeCode() == 'price') {
            $filterClassName = $this->filterTypes[self::PRICE_FILTER];
        } elseif ($attribute->getBackendType() == 'decimal') {
            $filterClassName = $this->filterTypes[self::DECIMAL_FILTER];
        }

        return $filterClassName;
    }
}