AbstractCollection.php

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

abstract class AbstractCollection extends \Magento\Framework\Model\ResourceModel\Db\VersionControl\Collection
{
    protected $_countSelect;

    protected $searchCriteria;

    public function setSelectCountSql(\Magento\Framework\DB\Select $countSelect)
    {
        $this->_countSelect = $countSelect;
        return $this;
    }

    public function getSelectCountSql()
    {
        if (!$this->_countSelect instanceof \Magento\Framework\DB\Select) {
            $this->setSelectCountSql(parent::getSelectCountSql());
        }
        return $this->_countSelect;
    }

    protected function _attributeToField($attribute)
    {
        $field = false;
        if (is_string($attribute)) {
            $field = $attribute;
        } elseif ($attribute instanceof \Magento\Eav\Model\Entity\Attribute) {
            $field = $attribute->getAttributeCode();
        }
        if (!$field) {
            throw new \Magento\Framework\Exception\LocalizedException(__('We cannot determine the field name.'));
        }
        return $field;
    }

    public function addAttributeToSelect($attribute)
    {
        $this->addFieldToSelect($this->_attributeToField($attribute));
        return $this;
    }

    public function addAttributeToFilter($attribute, $condition = null)
    {
        $this->addFieldToFilter($this->_attributeToField($attribute), $condition);
        return $this;
    }

    public function addAttributeToSort($attribute, $dir = 'asc')
    {
        $this->addOrder($this->_attributeToField($attribute), $dir);
        return $this;
    }

    public function setPage($pageNum, $pageSize)
    {
        $this->setCurPage($pageNum)->setPageSize($pageSize);
        return $this;
    }

    protected function _getAllIdsSelect($limit = null, $offset = null)
    {
        $idsSelect = clone $this->getSelect();
        $idsSelect->reset(\Magento\Framework\DB\Select::ORDER);
        $idsSelect->reset(\Magento\Framework\DB\Select::LIMIT_COUNT);
        $idsSelect->reset(\Magento\Framework\DB\Select::LIMIT_OFFSET);
        $idsSelect->reset(\Magento\Framework\DB\Select::COLUMNS);
        $idsSelect->columns($this->getResource()->getIdFieldName(), 'main_table');
        $idsSelect->limit($limit, $offset);
        return $idsSelect;
    }

    public function getAllIds($limit = null, $offset = null)
    {
        return $this->getConnection()->fetchCol($this->_getAllIdsSelect($limit, $offset), $this->_bindParams);
    }

    public function getSearchCriteria()
    {
        return $this->searchCriteria;
    }

    public function setSearchCriteria(\Magento\Framework\Api\SearchCriteriaInterface $searchCriteria = null)
    {
        $this->searchCriteria = $searchCriteria;
        return $this;
    }

    public function getTotalCount()
    {
        return $this->getSize();
    }

    public function setTotalCount($totalCount)
    {
        return $this;
    }

    public function setItems(array $items = null)
    {
        if (!$items) {
            return $this;
        }
        foreach ($items as $item) {
            $this->addItem($item);
        }
        return $this;
    }
}