Data::__construct() - Code Metrics - stojg/recommend - Measure and Improve Code Quality continuously with Scrutinizer

Data::__construct() A
last analyzed 2015-12-03 06:43 UTC

↳ Parent: Data

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes	3
Bugs	1	Features	0

Metric	Value
c	3
b	1
f	0
dl	0
loc	4
rs	10
cc	1
eloc	2
nc	1
nop	1

<?php

namespace stojg\recommend;

/**
 * This class contains behaviour for finding recommendations.
 */
class Data
{
    /**
     * This the.
     *
     * @var array
     */
    protected $item = '';

    /**
     * This is the full dataset.
     *
     * @var array
     */
    protected $set = [];

    /**
     * @param array $set - The full dataset
     */
    public function __construct($set)
    {
        $this->set = $set;
    }

    /**
     * Return a list of recommendations.
     *
     * @param string $for      - the item we want recommendations for
     * @param object $strategy
     *
     * @return array
     */
    public function recommend($for, $strategy)
    {
        $nearest = $this->findNearest($for, $strategy);
        if ($nearest === false) {
            return [];
        }
        $recommendations = [];
        foreach ($this->set[$nearest] as $item => $rating) {
            // The item has been already been rated
            if (isset($this->set[$for][$item])) {
                continue;
            }
            $recommendations[] = ['key' => $item, 'value' => $rating];
        }
        $this->sort($recommendations, false);

        return $recommendations;
    }

    /**
     * Find the nearest key that matching is closest to the item in the set.
     *
     * @return string
     */
    public function findNearest($for, $strategy)
    {
        $distances = [];
        foreach ($this->set as $key => $itemData) {
            if ($key == $for) {
                continue;
            }
            $distance = $strategy->run($itemData, $this->set[$for]);
            if ($distance === false) {
                continue;
            }
            $distances[] = ['key' => $key, 'value' => $distance];
        }
        if (!count($distances)) {
            return false;
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());
}
        }
        $this->sort($distances, true);

        return $distances[0]['key'];
    }

    /**
     * sort an nested array that have a value attribute.
     *
     * i.e [ 0 => [ 'value' => 5 ], 1 => [ 'value' => 2 ] ]
     *
     * @param array $distances
     * @param bool  $ascending
     */
    protected function sort(&$distances, $ascending = true)
    {
        usort($distances, function ($first, $second) use ($ascending) {
            if ($first['value'] > $second['value']) {
                return ($ascending) ? 1 : -1;
            } elseif ($first['value'] < $second['value']) {
                return ($ascending) ? -1 : 1;
            }

            return 0;
        });
    }
}


1			<?php
2
3			namespace stojg\recommend;
4
5			/**
6			* This class contains behaviour for finding recommendations.
7			*/
8			class Data
9			{
10			/**
11			* This the.
12			*
13			* @var array
14			*/
15			protected $item = '';
16
17			/**
18			* This is the full dataset.
19			*
20			* @var array
21			*/
22			protected $set = [];
23
24			/**
25			* @param array $set - The full dataset
26			*/
27			public function __construct($set)
28			{
29			$this->set = $set;
30			}
31
32			/**
33			* Return a list of recommendations.
34			*
35			* @param string $for - the item we want recommendations for
36			* @param object $strategy
37			*
38			* @return array
39			*/
40			public function recommend($for, $strategy)
41			{
42			$nearest = $this->findNearest($for, $strategy);
43			if ($nearest === false) {
44			return [];
45			}
46			$recommendations = [];
47			foreach ($this->set[$nearest] as $item => $rating) {
48			// The item has been already been rated
49			if (isset($this->set[$for][$item])) {
50			continue;
51			}
52			$recommendations[] = ['key' => $item, 'value' => $rating];
53			}
54			$this->sort($recommendations, false);
55
56			return $recommendations;
57			}
58
59			/**
60			* Find the nearest key that matching is closest to the item in the set.
61			*
62			* @return string
63			*/
64			public function findNearest($for, $strategy)
65			{
66			$distances = [];
67			foreach ($this->set as $key => $itemData) {
68			if ($key == $for) {
69			continue;
70			}
71			$distance = $strategy->run($itemData, $this->set[$for]);
72			if ($distance === false) {
73			continue;
74			}
75			$distances[] = ['key' => $key, 'value' => $distance];
76			}
77			if (!count($distances)) {
78			return false;
			0 ignored issues – show Bug Best Practice introduced 2015-12-03 05:54 UTC by Report Bug Copy Issue Report The return type of `return false;` (`false`) is incompatible with the return type documented by `stojg\recommend\Data::findNearest` of type `string`. 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...
79			}
80			$this->sort($distances, true);
81
82			return $distances[0]['key'];
83			}
84
85			/**
86			* sort an nested array that have a value attribute.
87			*
88			* i.e [ 0 => [ 'value' => 5 ], 1 => [ 'value' => 2 ] ]
89			*
90			* @param array $distances
91			* @param bool $ascending
92			*/
93			protected function sort(&$distances, $ascending = true)
94			{
95			usort($distances, function ($first, $second) use ($ascending) {
96			if ($first['value'] > $second['value']) {
97			return ($ascending) ? 1 : -1;
98			} elseif ($first['value'] < $second['value']) {
99			return ($ascending) ? -1 : 1;
100			}
101
102			return 0;
103			});
104			}
105			}
106

stojg / recommend

Data::__construct() A last analyzed 2015-12-03 06:43 UTC

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Data::__construct() A
last analyzed 2015-12-03 06:43 UTC