MaxComplexityQueryVisitor - Code Metrics - Youshido/GraphQL - Measure and Improve Code Quality continuously with Scrutinizer

MaxComplexityQueryVisitor A
last analyzed 2018-07-11 14:00 UTC

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Complexity

Total Complexity

Size/Duplication

Total Lines	45
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	2

Test Coverage

Coverage

100%

Importance

Changes

Metric	Value
wmc	5
lcom	1
cbo	2
dl	0
loc	45
ccs	14
cts	14
cp	1
rs	10
c	0
b	0
f	0

2 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	6	1
A	visit()	0	16	4

<?php
/*
* Concrete implementation of query visitor.
*
* Enforces maximum complexity on a query, computed from "cost" functions on
* the fields touched by that query.
*
* @author Ben Roberts <[email protected]>
* created: 7/11/16 11:05 AM
*/

namespace Youshido\GraphQL\Execution\Visitor;


use Youshido\GraphQL\Config\Field\FieldConfig;

class MaxComplexityQueryVisitor extends AbstractQueryVisitor
{

    /**
     * @var int max score allowed before throwing an exception (causing processing to stop)
     */
    public $maxScore;

    /**
     * @var int default score for nodes without explicit cost functions
     */
    protected $defaultScore = 1;

    /**
     * MaxComplexityQueryVisitor constructor.
     *
     * @param int $max max allowed complexity score
     */
    public function __construct($max)
    {
        parent::__construct();

        $this->maxScore = $max;
    }

    /**
     * {@inheritdoc}
     */
    public function visit(array $args, FieldConfig $fieldConfig, $childScore = 0)
    {
        $cost = $fieldConfig->get('cost', null);
        if (is_callable($cost)) {
            $cost = $cost($args, $fieldConfig, $childScore);
        }

        $cost = is_null($cost) ? $this->defaultScore : $cost;
        $this->memo += $cost;

        if ($this->memo > $this->maxScore) {
            throw new \Exception('query exceeded max allowed complexity of ' . $this->maxScore);
        }

        return $cost;
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		* Concrete implementation of query visitor.
4		*
5		* Enforces maximum complexity on a query, computed from "cost" functions on
6		* the fields touched by that query.
7		*
8		* @author Ben Roberts <[email protected]>
9		* created: 7/11/16 11:05 AM
10		*/
11
12		namespace Youshido\GraphQL\Execution\Visitor;
13
14
15		use Youshido\GraphQL\Config\Field\FieldConfig;
16
17		class MaxComplexityQueryVisitor extends AbstractQueryVisitor
18		{
19
20		/**
21		* @var int max score allowed before throwing an exception (causing processing to stop)
22		*/
23		public $maxScore;
24
25		/**
26		* @var int default score for nodes without explicit cost functions
27		*/
28		protected $defaultScore = 1;
29
30		/**
31		* MaxComplexityQueryVisitor constructor.
32		*
33		* @param int $max max allowed complexity score
34		*/
35	2	public function __construct($max)
36		{
37	2	parent::__construct();
38
39	2	$this->maxScore = $max;
40	2	}
41
42		/**
43		* {@inheritdoc}
44		*/
45	2	public function visit(array $args, FieldConfig $fieldConfig, $childScore = 0)
46		{
47	2	$cost = $fieldConfig->get('cost', null);
48	2	if (is_callable($cost)) {
49	1	$cost = $cost($args, $fieldConfig, $childScore);
50	1	}
51
52	2	$cost = is_null($cost) ? $this->defaultScore : $cost;
53	2	$this->memo += $cost;
54
55	2	if ($this->memo > $this->maxScore) {
56	1	throw new \Exception('query exceeded max allowed complexity of ' . $this->maxScore);
57		}
58
59	2	return $cost;
		0 ignored issues – show Bug Best Practice introduced 2017-09-10 23:23 UTC by Report Bug Copy Issue Report The return type of `return $cost;` (`object\|integer\|double\|string\|array\|boolean`) is incompatible with the return type declared by the abstract method `Youshido\GraphQL\Executi...ractQueryVisitor::visit` of type `integer\|null`. 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...
60		}
61		}

Youshido / GraphQL

MaxComplexityQueryVisitor A last analyzed 2018-07-11 14:00 UTC

Complexity

Size/Duplication

Coupling/Cohesion

Test Coverage

Importance

2 Methods

Duplication Side-by-Side

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MaxComplexityQueryVisitor A
last analyzed 2018-07-11 14:00 UTC