ExtractorChain - Code Metrics - Inspection of "add extraction interface and extractor chain" - abacaphiliac/php-extractor - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#1)

by Timothy

created 2016-09-11 02:18 UTC

ExtractorChain A

↳ Parent: Project

Complexity

Total Complexity

Size/Duplication

Total Lines	64
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	3

Importance

Changes

Metric	Value
dl	0
loc	64
c	0
b	0
f	0
wmc	8
lcom	1
cbo	3
rs	10

3 Methods

Rating	Name	Size	Complexity
A	__construct()	5	1
A	addExtractor()	4	1
B	extract()	32	6

<?php

namespace Abacaphiliac\Extractor;

use Abacaphiliac\Extractor\Exception\UnexpectedValueException;
use Zend\Stdlib\ArrayUtils;

class ExtractorChain implements ExtractionInterface
{
    /** @var ExtractionInterface[] */
    private $extractors = [];
    
    /** @var bool */
    private $mergeRecursively;

    /**
     * PendoOptionsProviderChain constructor.
     * @param ExtractionInterface[] $extractors
     * @param bool $mergeRecursively
     */
    public function __construct(array $extractors = [], $mergeRecursively = true)
    {
        array_walk($extractors, [$this, 'addExtractor']);
        $this->mergeRecursively = $mergeRecursively;
    }

    /**
     * @param ExtractionInterface $extractor
     */
    private function addExtractor(ExtractionInterface $extractor)
    {
        $this->extractors[] = $extractor;
    }

    /**
     * @return mixed[]
     * @throws \Abacaphiliac\Extractor\Exception\UnexpectedValueException
     */
    public function extract()
    {
        $dataSets = array_map(function (ExtractionInterface $extractor) {
            $data = $extractor->extract();
            
            if ($data instanceof \Traversable) {
                $data = iterator_to_array($data);
            }
            
            if (!is_array($data)) {
                throw new UnexpectedValueException(sprintf(
                    'Extractor type `%s` returned a `%s` instead of an `array`',
                    get_class($extractor),
                    is_object($data) ? get_class($data) : gettype($data)
                ));
            }

            return $data;
        }, $this->extractors);
        
        $result = [];
        
        if ($this->mergeRecursively) {
            foreach ($dataSets as $data) {
                $result = ArrayUtils::merge($result, $data);
            }
        } else {
            $result = array_merge(...$dataSets);
        }
        
        return $result;
class Author {
    private $name;

    public function __construct($name) {
        $this->name = $name;
    }

    public function getName() {
        return $this->name;
    }
}

abstract class Post {
    public function getAuthor() {
        return 'Johannes';
    }
}

class BlogPost extends Post {
    public function getAuthor() {
        return new Author('Johannes');
    }
}

class ForumPost extends Post { /* ... */ }

function my_function(Post $post) {
    echo strtoupper($post->getAuthor());
}
    }
}


1			<?php
2
3			namespace Abacaphiliac\Extractor;
4
5			use Abacaphiliac\Extractor\Exception\UnexpectedValueException;
6			use Zend\Stdlib\ArrayUtils;
7
8			class ExtractorChain implements ExtractionInterface
9			{
10			/** @var ExtractionInterface[] */
11			private $extractors = [];
12
13			/** @var bool */
14			private $mergeRecursively;
15
16			/**
17			* PendoOptionsProviderChain constructor.
18			* @param ExtractionInterface[] $extractors
19			* @param bool $mergeRecursively
20			*/
21			public function __construct(array $extractors = [], $mergeRecursively = true)
22			{
23			array_walk($extractors, [$this, 'addExtractor']);
24			$this->mergeRecursively = $mergeRecursively;
25			}
26
27			/**
28			* @param ExtractionInterface $extractor
29			*/
30			private function addExtractor(ExtractionInterface $extractor)
31			{
32			$this->extractors[] = $extractor;
33			}
34
35			/**
36			* @return mixed[]
37			* @throws \Abacaphiliac\Extractor\Exception\UnexpectedValueException
38			*/
39			public function extract()
40			{
41			$dataSets = array_map(function (ExtractionInterface $extractor) {
42			$data = $extractor->extract();
43
44			if ($data instanceof \Traversable) {
45			$data = iterator_to_array($data);
46			}
47
48			if (!is_array($data)) {
49			throw new UnexpectedValueException(sprintf(
50			'Extractor type `%s` returned a `%s` instead of an `array`',
51			get_class($extractor),
52			is_object($data) ? get_class($data) : gettype($data)
53			));
54			}
55
56			return $data;
57			}, $this->extractors);
58
59			$result = [];
60
61			if ($this->mergeRecursively) {
62			foreach ($dataSets as $data) {
63			$result = ArrayUtils::merge($result, $data);
64			}
65			} else {
66			$result = array_merge(...$dataSets);
67			}
68
69			return $result;
			0 ignored issues – show Bug Best Practice introduced 2016-09-11 02:23 UTC by Report Bug Copy Issue Report The return type of `return $result;` (`array`) is incompatible with the return type declared by the interface `Abacaphiliac\Extractor\E...ctionInterface::extract` of type `Traversable\|array`. If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design. Let’s take a look at an example: class Author { private $name; public function __construct($name) { $this->name = $name; } public function getName() { return $this->name; } } abstract class Post { public function getAuthor() { return 'Johannes'; } } class BlogPost extends Post { public function getAuthor() { return new Author('Johannes'); } } class ForumPost extends Post { /* ... */ } function my_function(Post $post) { echo strtoupper($post->getAuthor()); } Our function `my_function` expects a `Post` object, and outputs the author of the post. The base class `Post` returns a simple string and outputting a simple string will work just fine. However, the child class `BlogPost` which is a sub-type of `Post` instead decided to return an `object`, and is therefore violating the SOLID principles. If a `BlogPost` were passed to `my_function`, PHP would not complain, but ultimately fail when executing the `strtoupper` call in its body. Loading history...
70			}
71			}
72

abacaphiliac / php-extractor

Pull Request — master (#1)

ExtractorChain A

Complexity

Size/Duplication

Coupling/Cohesion

Importance

3 Methods

Duplication Side-by-Side

Filter issues like