Pattern.php

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<?php
namespace Magento\Setup\Model\Complex;

class Pattern
{
    protected $_headers;

    protected $_rowsSet;

    protected $_position = 0;

    public function setHeaders(array $headers)
    {
        $this->_headers = $headers;
        return $this;
    }

    public function getHeaders()
    {
        return $this->_headers;
    }

    public function setRowsSet(array $rowsSet)
    {
        if (!count($rowsSet)) {
            throw new \Exception("Rows set must contain at least 1 array representing a row pattern");
        }
        $this->_rowsSet = $rowsSet;
        if (!isset($this->_headers)) {
            $this->_headers = array_keys($rowsSet[0]);
        }
        return $this;
    }

    public function addRow(array $row)
    {
        $this->_rowsSet[] = $row;
        return $this;
    }

    public function getRow($index, $generatorKey)
    {
        $row = $this->_rowsSet[$generatorKey % count($this->_rowsSet)];
        foreach ($this->getHeaders() as $key) {
            if (isset($row[$key])) {
                if (is_callable($row[$key])) {
                    $row[$key] = call_user_func($row[$key], $index, $generatorKey);
                } else {
                    $row[$key] = str_replace('%s', $index, $row[$key]);
                }
            } else {
                $row[$key] = '';
            }
        }
        return $row;
    }

    public function getRowsCount()
    {
        return count($this->_rowsSet);
    }
}