SubjectivePHP\Csv\HeaderStrategy

Complexity

Total Complexity

5

Size/Duplication

Total Lines	71
Duplicated Lines	0 %

Coupling/Cohesion

Components	2
Dependencies	0

Importance

Changes

0

5 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	4	1
A	derive()	0	10	1
A	provide()	0	8	1
A	none()	0	11	1
A	getHeaders()	0	4	1

<?php

namespace SubjectivePHP\Csv;

use SplFileObject;

final class HeaderStrategy implements HeaderStrategyInterface
{
    /**
     * @var callable
     */
    private $getHeadersCallable;

    private function __construct(callable $getHeadersCallable)
    {
        $this->getHeadersCallable = $getHeadersCallable;
    }

    /**
     * Create header strategy which derives the headers from the first line of the file.
     *
     * @return HeaderstrategyInterface
     */
    public static function derive() : HeaderStrategyInterface
    {
        return new self(
            function (SplFileObject $fileObject) : array {
                $row = $fileObject->fgetcsv();
                $fileObject->rewind();
                return $row;
            }
        );
    }

    /**
     * Create header strategy which uses the provided headers array.
     *
     * @return HeaderstrategyInterface
     */
    public static function provide(array $headers) : HeaderStrategyInterface
    {
        return new self(
            function () use ($headers) : array {
                return $headers;
            }
        );
    }

    /**
     * Create header strategy which generates a numeric array whose size is the number of columns in the given file.
     *
     * @return HeaderstrategyInterface
     */
    public static function none() : HeaderStrategyInterface
    {
        return new self(
            function (SplFileObject $fileObject) : array {
                $firstRow = $fileObject->fgetcsv();
                $headers = array_keys($firstRow);
                $fileObject->rewind();
                return $headers;
            }
        );
    }

    /**
     * Extracts headers from the given SplFileObject.
     *
     * @param SplFileObject $fileObject The delimited file containing the headers.
     *
     * @return array
     */
    public function getHeaders(SplFileObject $fileObject) : array
    {
        return ($this->getHeadersCallable)($fileObject);
    }
}