Hal\Metrics\Complexity\Structural\HenryAndKafura\Coupling

Complexity

Total Complexity

9

Size/Duplication

Total Lines	57
Duplicated Lines	0 %

Coupling/Cohesion

Components	0
Dependencies	3

Importance

Changes	1
Bugs	1	Features	0

2 Methods

Rating	Name	Duplication	Size	Complexity
A	calculate()	0	13	3
B	extractCoupling()	0	27	6

<?php

/*
 * (c) Jean-François Lépine <https://twitter.com/Halleck45>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Hal\Metrics\Complexity\Structural\HenryAndKafura;
use Hal\Component\OOP\Extractor\ClassMap;


/**
 * Estimates coupling (based on work of Henry And Kafura)
 *
 * @author Jean-François Lépine <https://twitter.com/Halleck45>
 */
class Coupling {

    /**
     * Calculates coupling
     *
     * @param ClassMap $result
     * @return ResultMap
     */
    public function calculate(ClassMap $result)
    {
        $map = $this->extractCoupling($result);

        // instability
        foreach($map as &$class) {
            if($class->getAfferentCoupling() + $class->getEfferentCoupling() > 0) {
                $class->setInstability($class->getEfferentCoupling() / ($class->getAfferentCoupling() + $class->getEfferentCoupling()));
            }
        }

        return new ResultMap($map);
    }


    /**
     * Extracts afferent and efferent coupling
     *
     * @param ClassMap $result
     * @return array
     */
    private function extractCoupling(ClassMap $result) {
        $results = $result->all();

        $classes = array();
        foreach($results as $result) {
            $classes = array_merge($classes, $result->getClasses());
        }

        $map = array();
        foreach($classes as $class) {

            if(!isset($map[$class->getFullname()])) {
                $map[$class->getFullname()] = new Result($class->getFullname());
            }

            $dependencies = $class->getDependencies();
            $map[$class->getFullname()]->setEfferentCoupling(sizeof($dependencies, COUNT_NORMAL));

            foreach($dependencies as $dependency) {
                if(!isset($map[$dependency])) {
                    $map[$dependency] = new Result($dependency);
                }
                $map[$dependency]->setAfferentCoupling($map[$dependency]->getAfferentCoupling() + 1);
            }
        }
        return $map;
    }
};