DependencyContainer::__construct() - Code Metrics - ppetermann/king23-di - Measure and Improve Code Quality continuously with Scrutinizer

DependencyContainer::__construct() A
last analyzed 2018-08-25 16:26 UTC

↳ Parent: DependencyContainer

Complexity

Conditions	1
Paths	1

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	11
CRAP Score	1

Importance

Changes

Metric	Value
dl	0
loc	20
ccs	11
cts	11
cp	1
rs	9.6
c	0
b	0
f	0
cc	1
nc	1
nop	0
crap	1

<?php

namespace King23\DI;

use King23\DI\Exception\AlreadyRegisteredException;
use King23\DI\Exception\NotFoundException;

/**
 * Class DependencyContainer
 * @package King23\DI
 */
class DependencyContainer implements ContainerInterface
{
    protected $injectors = [];

    /**
     * Constructor
     */
    public function __construct()
    {
        $that = $this;
        // we register ourselves, so this container can be injected too
        /** @noinspection PhpUnhandledExceptionInspection */
        $this->register(
            \Psr\Container\ContainerInterface::class,
            function () use ($that) {
                return $that;
            }
        );

        /** @noinspection PhpUnhandledExceptionInspection */
        $this->register(
            ContainerInterface::class,
            function () use ($that) {
                return $that;
            }
        );
    }

    /**
     * check if for $interface there is an existing service to inject
     *
     * @param $interface
     * @return bool
     */
    protected function hasServiceFor($interface)
    {
        return isset($this->injectors[$interface]);
    }

    /**
     * gets a service instance for $interface - singletoned!
     *
     * @param string $interface
     * @return mixed
     */
    protected function getServiceInstanceFor($interface)
    {
        return $this->injectors[$interface]();
    }

    /**
     * register an service implementation as a singleton (shared instance)
     *
     * @param $interface
     * @param callable $implementation
     * @throws AlreadyRegisteredException
     */
    public function register($interface, callable $implementation)
    {
        if (isset($this->injectors[$interface])) {
            throw new AlreadyRegisteredException("Error: for $interface there is already an implementation registered");
        }

        // wraps the implementation in a singleton
        $this->injectors[$interface] = function () use ($implementation) {
            static $instance;
            if (is_null($instance)) {
                $instance = $implementation();
            }

            return $instance;
        };
    }

    /**
     * register a service implementation as a factory
     *
     * @param $interface
     * @param callable $implementation
     * @throws AlreadyRegisteredException
     */
    public function registerFactory($interface, callable $implementation)
    {
        if (isset($this->injectors[$interface])) {
            throw new AlreadyRegisteredException("Error: for $interface there is already an implementation registered");
        }

        $this->injectors[$interface] = $implementation;
    }

    /**
     * @param string $classname fully qualified classname
     * @return object
     * @throws NotFoundException
     * @throws \ReflectionException
     */
    public function get($classname)
    {
        // first we check if this is maybe a known service
        if ($this->hasServiceFor($classname)) {
            return $this->getServiceInstanceFor($classname);
        }

        // alright, this was not one of our known services, so we assume
        // we are supposed to play factory for $classname

        // lets see if the class actually exists first
        if (!class_exists($classname, true) && !interface_exists($classname, true)) {
            throw new NotFoundException("Class/Interface not found: '$classname'");
        }

        $reflector = new \ReflectionClass($classname);

        $args = [];

        $constructor = $reflector->getConstructor();

        // if there is no constructor, we don't need to inject anything
        if (!is_null($constructor)) {
            /** @var \ReflectionParameter $parameter */
            foreach ($constructor->getParameters() as $parameter) {
                $args[] = $this->handleReflectionParameter($parameter, $classname);
            }
        }

        if ($reflector->isInterface()) {
            throw new NotFoundException("no Injector registered for interface: '$classname'");
        }

        return $reflector->newInstanceArgs($args);
    }

    /**
     * Returns true if the container can return an entry for the given identifier.
     * Returns false otherwise.
     *
     * `has($id)` returning true does not mean that `get($id)` will not throw an exception.
     * It does however mean that `get($id)` will not throw a `NotFoundExceptionInterface`.
     *
     * @param string $id Identifier of the entry to look for.
     *
     * @return bool
     */
    public function has($id)
    {
        // if we have a service registered, we can assume true
        if($this->hasServiceFor($id)) {
            return true;
        }

        // if we don't have as service registered, we might still pull one from the hat
        // so lets at least check if the class would be available
        return class_exists($id, true);
    }

    /**
     * @param \ReflectionParameter $parameter
     * @param string $classname
     * @return mixed|object
     * @throws NotFoundException
     * @throws \ReflectionException
     */
    private function handleReflectionParameter(\ReflectionParameter $parameter, $classname)
    {
        try {
            if (is_null($parameter->getClass())) {
                throw new NotFoundException("parameters for constructor contains field without typehint");
            }
        } catch (\ReflectionException $reflectionException) {
            throw new NotFoundException("can't reflect parameter '{$parameter->name}' of '$classname'", 0, $reflectionException);
        }
        $paramClass = $parameter->getClass()->getName();
        if ($this->hasServiceFor($paramClass)) {
            return $this->getServiceInstanceFor($paramClass);
        } else {
            return $this->get($paramClass);
        }
    }
}


1		<?php
2
3		namespace King23\DI;
4
5		use King23\DI\Exception\AlreadyRegisteredException;
6		use King23\DI\Exception\NotFoundException;
7
8		/**
9		* Class DependencyContainer
10		* @package King23\DI
11		*/
12		class DependencyContainer implements ContainerInterface
13		{
14		protected $injectors = [];
15
16		/**
17		* Constructor
18		*/
19	10	public function __construct()
20		{
21	10	$that = $this;
22		// we register ourselves, so this container can be injected too
23		/** @noinspection PhpUnhandledExceptionInspection */
24	10	$this->register(
25	10	\Psr\Container\ContainerInterface::class,
26		function () use ($that) {
27	1	return $that;
28		}
29	10	);
30
31		/** @noinspection PhpUnhandledExceptionInspection */
32	10	$this->register(
33	10	ContainerInterface::class,
34		function () use ($that) {
35	1	return $that;
36		}
37	10	);
38	10	}
39
40		/**
41		* check if for $interface there is an existing service to inject
42		*
43		* @param $interface
44		* @return bool
45		*/
46	8	protected function hasServiceFor($interface)
47		{
48	8	return isset($this->injectors[$interface]);
49		}
50
51		/**
52		* gets a service instance for $interface - singletoned!
53		*
54		* @param string $interface
55		* @return mixed
56		*/
57	4	protected function getServiceInstanceFor($interface)
58		{
59	4	return $this->injectors[$interface]();
60		}
61
62		/**
63		* register an service implementation as a singleton (shared instance)
64		*
65		* @param $interface
66		* @param callable $implementation
67		* @throws AlreadyRegisteredException
68		*/
69	10	public function register($interface, callable $implementation)
70		{
71	10	if (isset($this->injectors[$interface])) {
72	1	throw new AlreadyRegisteredException("Error: for $interface there is already an implementation registered");
73		}
74
75		// wraps the implementation in a singleton
76	3	$this->injectors[$interface] = function () use ($implementation) {
77	3	static $instance;
78	3	if (is_null($instance)) {
79	3	$instance = $implementation();
80	3	}
81
82	3	return $instance;
83		};
84	10	}
85
86		/**
87		* register a service implementation as a factory
88		*
89		* @param $interface
90		* @param callable $implementation
91		* @throws AlreadyRegisteredException
92		*/
93	2	public function registerFactory($interface, callable $implementation)
94		{
95	2	if (isset($this->injectors[$interface])) {
96	1	throw new AlreadyRegisteredException("Error: for $interface there is already an implementation registered");
97		}
98
99	1	$this->injectors[$interface] = $implementation;
100	1	}
101
102		/**
103		* @param string $classname fully qualified classname
104		* @return object
105		* @throws NotFoundException
106		* @throws \ReflectionException
107		*/
108	8	public function get($classname)
109		{
110		// first we check if this is maybe a known service
111	8	if ($this->hasServiceFor($classname)) {
112	1	return $this->getServiceInstanceFor($classname);
113		}
114
115		// alright, this was not one of our known services, so we assume
116		// we are supposed to play factory for $classname
117
118		// lets see if the class actually exists first
119	8	if (!class_exists($classname, true) && !interface_exists($classname, true)) {
120	1	throw new NotFoundException("Class/Interface not found: '$classname'");
121		}
122
123	7	$reflector = new \ReflectionClass($classname);
124
125	7	$args = [];
126
127	7	$constructor = $reflector->getConstructor();
128
129		// if there is no constructor, we don't need to inject anything
130	7	if (!is_null($constructor)) {
131		/** @var \ReflectionParameter $parameter */
132	7	foreach ($constructor->getParameters() as $parameter) {
133	7	$args[] = $this->handleReflectionParameter($parameter, $classname);
134	4	}
135	4	}
136
137	5	if ($reflector->isInterface()) {
138	1	throw new NotFoundException("no Injector registered for interface: '$classname'");
139		}
140
141	4	return $reflector->newInstanceArgs($args);
142		}
143
144		/**
145		* Returns true if the container can return an entry for the given identifier.
146		* Returns false otherwise.
147		*
148		* `has($id)` returning true does not mean that `get($id)` will not throw an exception.
149		* It does however mean that `get($id)` will not throw a `NotFoundExceptionInterface`.
150		*
151		* @param string $id Identifier of the entry to look for.
152		*
153		* @return bool
154		*/
155	6	public function has($id)
156		{
157		// if we have a service registered, we can assume true
158	6	if($this->hasServiceFor($id)) {
159	3	return true;
160		}
161
162		// if we don't have as service registered, we might still pull one from the hat
163		// so lets at least check if the class would be available
164	5	return class_exists($id, true);
165		}
166
167		/**
168		* @param \ReflectionParameter $parameter
169		* @param string $classname
170		* @return mixed\|object
171		* @throws NotFoundException
172		* @throws \ReflectionException
173		*/
174	7	private function handleReflectionParameter(\ReflectionParameter $parameter, $classname)
175		{
176		try {
177	7	if (is_null($parameter->getClass())) {
178	1	throw new NotFoundException("parameters for constructor contains field without typehint");
179		}
180	7	} catch (\ReflectionException $reflectionException) {
181	1	throw new NotFoundException("can't reflect parameter '{$parameter->name}' of '$classname'", 0, $reflectionException);
182		}
183	5	$paramClass = $parameter->getClass()->getName();
184	5	if ($this->hasServiceFor($paramClass)) {
185	4	return $this->getServiceInstanceFor($paramClass);
186		} else {
187	1	return $this->get($paramClass);
188		}
189		}
190		}
191

ppetermann / king23-di

DependencyContainer::__construct() A last analyzed 2018-08-25 16:26 UTC

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DependencyContainer::__construct() A
last analyzed 2018-08-25 16:26 UTC