<?php

namespace PhpOffice\PhpSpreadsheet\Worksheet;

class Column
{
    /**
     * \PhpOffice\PhpSpreadsheet\Worksheet\Worksheet.
     *
     * @var Worksheet
     */

<     private $parent;



>     private $worksheet;



    /**
     * Column index.
     *
     * @var string
     */
    private $columnIndex;

    /**
     * Create a new column.
     *

<      * @param Worksheet $parent


     * @param string $columnIndex
     */

<     public function __construct(?Worksheet $parent = null, $columnIndex = 'A')



>     public function __construct(Worksheet $worksheet, $columnIndex = 'A')


    {
        // Set parent and column index

<         $this->parent = $parent;



>         $this->worksheet = $worksheet;


        $this->columnIndex = $columnIndex;
    }

    /**
     * Destructor.
     */
    public function __destruct()
    {

<         $this->parent = null;



>         // @phpstan-ignore-next-line
>         $this->worksheet = null;


    }

    /**
     * Get column index as string eg: 'A'.

<      *
<      * @return string


     */

<     public function getColumnIndex()



>     public function getColumnIndex(): string


    {
        return $this->columnIndex;
    }

    /**
     * Get cell iterator.
     *
     * @param int $startRow The row number at which to start iterating
     * @param int $endRow Optionally, the row number at which to stop iterating
     *
     * @return ColumnCellIterator
     */
    public function getCellIterator($startRow = 1, $endRow = null)
    {

<         return new ColumnCellIterator($this->parent, $this->columnIndex, $startRow, $endRow);



>         return new ColumnCellIterator($this->worksheet, $this->columnIndex, $startRow, $endRow);
>     }
> 
>     /**
>      * Returns a boolean true if the column contains no cells. By default, this means that no cell records exist in the
>      *         collection for this column. false will be returned otherwise.
>      *     This rule can be modified by passing a $definitionOfEmptyFlags value:
>      *          1 - CellIterator::TREAT_NULL_VALUE_AS_EMPTY_CELL If the only cells in the collection are null value
>      *                  cells, then the column will be considered empty.
>      *          2 - CellIterator::TREAT_EMPTY_STRING_AS_EMPTY_CELL If the only cells in the collection are empty
>      *                  string value cells, then the column will be considered empty.
>      *          3 - CellIterator::TREAT_NULL_VALUE_AS_EMPTY_CELL | CellIterator::TREAT_EMPTY_STRING_AS_EMPTY_CELL
>      *                  If the only cells in the collection are null value or empty string value cells, then the column
>      *                  will be considered empty.
>      *
>      * @param int $definitionOfEmptyFlags
>      *              Possible Flag Values are:
>      *                  CellIterator::TREAT_NULL_VALUE_AS_EMPTY_CELL
>      *                  CellIterator::TREAT_EMPTY_STRING_AS_EMPTY_CELL
>      */
>     public function isEmpty(int $definitionOfEmptyFlags = 0): bool
>     {
>         $nullValueCellIsEmpty = (bool) ($definitionOfEmptyFlags & CellIterator::TREAT_NULL_VALUE_AS_EMPTY_CELL);
>         $emptyStringCellIsEmpty = (bool) ($definitionOfEmptyFlags & CellIterator::TREAT_EMPTY_STRING_AS_EMPTY_CELL);
> 
>         $cellIterator = $this->getCellIterator();
>         $cellIterator->setIterateOnlyExistingCells(true);
>         foreach ($cellIterator as $cell) {
>             $value = $cell->getValue();
>             if ($value === null && $nullValueCellIsEmpty === true) {
>                 continue;
>             }
>             if ($value === '' && $emptyStringCellIsEmpty === true) {
>                 continue;
>             }
> 
>             return false;
>         }
> 
>         return true;
>     }
> 
>     /**
>      * Returns bound worksheet.
>      */
>     public function getWorksheet(): Worksheet
>     {
>         return $this->worksheet;


    }
}