Collection.php

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<?php
namespace Magento\Tax\Model\ResourceModel\TaxClass;

class Collection extends \Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection
{
    public function _construct()
    {
        $this->_init(\Magento\Tax\Model\ClassModel::class, \Magento\Tax\Model\ResourceModel\TaxClass::class);
    }

    public function setClassTypeFilter($classTypeId)
    {
        return $this->addFieldToFilter('main_table.class_type', $classTypeId);
    }

    public function toOptionArray()
    {
        return $this->_toOptionArray('class_id', 'class_name');
    }

    public function toOptionHash()
    {
        return $this->_toOptionHash('class_id', 'class_name');
    }
}