Container::getValueInstance() - Code Metrics - Inspection of "Feature/reflection based dependency injection" - starweb/starlit-app - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#3)

unknown

created 2018-09-28 12:57 UTC

Container::getValueInstance() A

↳ Parent: Container

Complexity

Conditions	3
Paths	3

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	7
CRAP Score	3

Importance

Changes

Metric	Value
dl	0
loc	12
ccs	7
cts	7
cp	1
rs	9.8666
c	0
b	0
f	0
cc	3
nc	3
nop	1
crap	3

<?php
/**
 * Starlit App.
 *
 * @copyright Copyright (c) 2016 Starweb AB
 * @license   BSD 3-Clause
 */

namespace Starlit\App\Container;

use Psr\Container\ContainerInterface;

/**
 * Dependency injection container.
 *
 * @author Andreas Nilsson <http://github.com/jandreasn>
 */
class Container implements ContainerInterface
{
    /**
     * @var array
     */
    private $dicValues = [];

    /**
     * @var array
     */
    private $aliases = [];

    /**
     * @var array
     */
    private $dicObjects = [];

    /**
     * Set a DIC value.
     *
     * Wrap objects provided in a closure for lazy loading.
     *
     * @param string $key
     * @param mixed  $value
     * @return Container
     */
    public function set(string $key, $value): self
    {
        if (!(\is_string($value) || \is_object($value))) {
            throw new \InvalidArgumentException('Value must be a class name, an object instance, or a callable');
        }

        $this->dicValues[$key] = $value;
        unset($this->dicObjects[$key]); // In case an object instance was stored for sharing

        return $this;
    }

    public function alias(string $alias, string $key): self
    {
        $this->aliases[$alias] = $key;

        return $this;
    }

    /**
     * Check if a DIC value/object exists.
     *
     * @param string $key
     * @return bool
     */
    public function has($key): bool
    {
        if (isset($this->aliases[$key])) {
            $key = $this->aliases[$key];
        }

        return isset($this->dicValues[$key]);
    }

    /**
     * @param string $key
     * @return bool
     */
    public function hasInstance($key): bool
    {
        if (isset($this->aliases[$key])) {
            $key = $this->aliases[$key];
        }

        return isset($this->dicObjects[$key]);
    }

    /**
     * Get the shared instance of a DIC object
     *
     * @param string $key
     * @return mixed
     */
    public function get($key)
    {
        if (isset($this->aliases[$key])) {
            $key = $this->aliases[$key];
        }

        // Get already instantiated object if it exist
        if (isset($this->dicObjects[$key])) {
            return $this->dicObjects[$key];
        }

        try {
            if (isset($this->dicValues[$key])) {
                $instance = $this->getValueInstance($key);
            } else {
                $instance = $this->resolveInstance($key);
            }
        } catch (\ReflectionException $e) {
            throw new NotFoundException(sprintf('Key "%s" could not be resolved. ', $key));
        }

        $this->dicObjects[$key] = $instance;

        return $this->dicObjects[$key];
    }

    /**
     * Get a new instance of a DIC object
     *
     * @param string $key
     * @return mixed
     */
    public function getNew(string $key)
    {
        if (isset($this->aliases[$key])) {
            $key = $this->aliases[$key];
        }

        try {
            if (isset($this->dicValues[$key])) {
                return $this->getValueInstance($key);
            }
            return $this->resolveInstance($key);
        } catch (\ReflectionException $e) {
            throw new NotFoundException(sprintf('Key "%s" could not be resolved.', $key));
        }
    }

    private function getValueInstance(string $key)
    {
        $value = $this->dicValues[$key];
        if (\is_object($value)) {
            // Is it an invokable? (closure/anonymous function)
            if (method_exists($value, '__invoke')) {
                return $value($this);
            }
            return $value;
        }
        return $this->resolveInstance($value);
    }

    /**
     * Destroy a DIC object instance.
     *
     * Will force a new object to be created on next call.
     *
     * @param string $key
     */
    public function destroyInstance($key): void
    {
        unset($this->dicObjects[$key]);
    }

    /**
     * Destroy all DIC object instances.
     *
     * Will force new objects to be created on next call.
     */
    public function destroyAllInstances(): void
    {
        $this->dicObjects = [];

        // To make sure objects (like database connections) are destructed properly. PHP might not destruct objects
        // until the end of execution otherwise.
        gc_collect_cycles();
    }

    /**
     * Magic method to get or set DIC values.
     *
     * @param string $name
     * @param array  $arguments
     * @return mixed
     */
    public function __call($name, $arguments)
    {
        // getNew followed by an upper letter like getNewApple()
        if (preg_match('/^getNew([A-Z].*)/', $name, $matches)) {
            $key = lcfirst($matches[1]);

            return $this->getNew($key);
        } elseif (strpos($name, 'get') === 0) {
            $key = lcfirst(substr($name, 3));

            return $this->get($key);
        } elseif (strpos($name, 'set') === 0) {
            $argumentCount = \count($arguments);
            if ($argumentCount !== 1) {
                throw new \BadMethodCallException("Invalid argument count[{$argumentCount}] for application {$name}()");
            }

            $key = lcfirst(substr($name, 3));

            return $this->set($key, $arguments[0]);
        } else {
            throw new \BadMethodCallException("No application method named {$name}()");
        }
    }

    /**
     * Instantiate an object of named class, recursively resolving dependencies
     *
     * @param string $className Fully qualified class name
     * @return mixed
     * @throws \ReflectionException
     */
    private function resolveInstance(string $className)
    {
        $class = new \ReflectionClass($className);

        if (!$class->isInstantiable()) {
            throw new \ReflectionException(sprintf('Class %s cannot be instantiated', $className));
        }

        $parameterValues = [];
        if (($constructor = $class->getConstructor())) {
            $parameterValues = $this->resolveParameters(
                $constructor->getParameters()
            );
        }

        return $class->newInstanceArgs($parameterValues);
    }

    /**
     * Recursively resolve function parameters using type hints
     *
     * @param \ReflectionParameter[]
     * @return mixed
     */
    private function resolveParameters(array $parameters): array
    {
        $values = [];

        /**
         * @var \ReflectionParameter $parameter
         */
        foreach ($parameters as $parameter) {
            if (($parameterClass = $parameter->getClass())) {
                try {
                    $values[] = $this->get($parameterClass->getName());
                }
                catch (NotFoundException $e) { // We're probably dealing with an unmapped interface here
                    $values[] = $parameter->getDefaultValue();
                }
            } else {
                $values[] = $parameter->getDefaultValue();
            }
        }

        return $values;
    }
}


1		<?php
2		/**
3		* Starlit App.
4		*
5		* @copyright Copyright (c) 2016 Starweb AB
6		* @license BSD 3-Clause
7		*/
8
9		namespace Starlit\App\Container;
10
11		use Psr\Container\ContainerInterface;
12
13		/**
14		* Dependency injection container.
15		*
16		* @author Andreas Nilsson <http://github.com/jandreasn>
17		*/
18		class Container implements ContainerInterface
19		{
20		/**
21		* @var array
22		*/
23		private $dicValues = [];
24
25		/**
26		* @var array
27		*/
28		private $aliases = [];
29
30		/**
31		* @var array
32		*/
33		private $dicObjects = [];
34
35		/**
36		* Set a DIC value.
37		*
38		* Wrap objects provided in a closure for lazy loading.
39		*
40		* @param string $key
41		* @param mixed $value
42		* @return Container
43		*/
44	21	public function set(string $key, $value): self
45		{
46	21	if (!(\is_string($value) \|\| \is_object($value))) {
47		throw new \InvalidArgumentException('Value must be a class name, an object instance, or a callable');
48		}
49
50	21	$this->dicValues[$key] = $value;
51	21	unset($this->dicObjects[$key]); // In case an object instance was stored for sharing
52
53	21	return $this;
54		}
55
56	21	public function alias(string $alias, string $key): self
57		{
58	21	$this->aliases[$alias] = $key;
59
60	21	return $this;
61		}
62
63		/**
64		* Check if a DIC value/object exists.
65		*
66		* @param string $key
67		* @return bool
68		*/
69	2	public function has($key): bool
70		{
71	2	if (isset($this->aliases[$key])) {
72		$key = $this->aliases[$key];
73		}
74
75	2	return isset($this->dicValues[$key]);
76		}
77
78		/**
79		* @param string $key
80		* @return bool
81		*/
82	2	public function hasInstance($key): bool
83		{
84	2	if (isset($this->aliases[$key])) {
85	1	$key = $this->aliases[$key];
86		}
87
88	2	return isset($this->dicObjects[$key]);
89		}
90
91		/**
92		* Get the shared instance of a DIC object
93		*
94		* @param string $key
95		* @return mixed
96		*/
97	21	public function get($key)
98		{
99	21	if (isset($this->aliases[$key])) {
100		$key = $this->aliases[$key];
101		}
102
103		// Get already instantiated object if it exist
104	21	if (isset($this->dicObjects[$key])) {
105	2	return $this->dicObjects[$key];
106		}
107
108		try {
109	21	if (isset($this->dicValues[$key])) {
110	21	$instance = $this->getValueInstance($key);
111		} else {
112	21	$instance = $this->resolveInstance($key);
113		}
114	1	} catch (\ReflectionException $e) {
115	1	throw new NotFoundException(sprintf('Key "%s" could not be resolved. ', $key));
116		}
117
118	21	$this->dicObjects[$key] = $instance;
119
120	21	return $this->dicObjects[$key];
121		}
122
123		/**
124		* Get a new instance of a DIC object
125		*
126		* @param string $key
127		* @return mixed
128		*/
129	3	public function getNew(string $key)
130		{
131	3	if (isset($this->aliases[$key])) {
132		$key = $this->aliases[$key];
133		}
134
135		try {
136	3	if (isset($this->dicValues[$key])) {
137	2	return $this->getValueInstance($key);
138		}
139	1	return $this->resolveInstance($key);
140	2	} catch (\ReflectionException $e) {
141	2	throw new NotFoundException(sprintf('Key "%s" could not be resolved.', $key));
142		}
143		}
144
145	21	private function getValueInstance(string $key)
146		{
147	21	$value = $this->dicValues[$key];
148	21	if (\is_object($value)) {
149		// Is it an invokable? (closure/anonymous function)
150	21	if (method_exists($value, '__invoke')) {
151	21	return $value($this);
152		}
153	7	return $value;
154		}
155	1	return $this->resolveInstance($value);
156		}
157
158		/**
159		* Destroy a DIC object instance.
160		*
161		* Will force a new object to be created on next call.
162		*
163		* @param string $key
164		*/
165	1	public function destroyInstance($key): void
166		{
167	1	unset($this->dicObjects[$key]);
168	1	}
169
170		/**
171		* Destroy all DIC object instances.
172		*
173		* Will force new objects to be created on next call.
174		*/
175	1	public function destroyAllInstances(): void
176		{
177	1	$this->dicObjects = [];
178
179		// To make sure objects (like database connections) are destructed properly. PHP might not destruct objects
180		// until the end of execution otherwise.
181	1	gc_collect_cycles();
182	1	}
183
184		/**
185		* Magic method to get or set DIC values.
186		*
187		* @param string $name
188		* @param array $arguments
189		* @return mixed
190		*/
191	3	public function __call($name, $arguments)
192		{
193		// getNew followed by an upper letter like getNewApple()
194	3	if (preg_match('/^getNew([A-Z].*)/', $name, $matches)) {
195		$key = lcfirst($matches[1]);
196
197		return $this->getNew($key);
198	3	} elseif (strpos($name, 'get') === 0) {
199	1	$key = lcfirst(substr($name, 3));
200
201	1	return $this->get($key);
202	3	} elseif (strpos($name, 'set') === 0) {
203	2	$argumentCount = \count($arguments);
204	2	if ($argumentCount !== 1) {
205	1	throw new \BadMethodCallException("Invalid argument count[{$argumentCount}] for application {$name}()");
206		}
207
208	1	$key = lcfirst(substr($name, 3));
209
210	1	return $this->set($key, $arguments[0]);
211		} else {
212	1	throw new \BadMethodCallException("No application method named {$name}()");
213		}
214		}
215
216		/**
217		* Instantiate an object of named class, recursively resolving dependencies
218		*
219		* @param string $className Fully qualified class name
220		* @return mixed
221		* @throws \ReflectionException
222		*/
223	3	private function resolveInstance(string $className)
224		{
225	3	$class = new \ReflectionClass($className);
226
227		if (!$class->isInstantiable()) {
228		throw new \ReflectionException(sprintf('Class %s cannot be instantiated', $className));
229		}
230
231		$parameterValues = [];
232		if (($constructor = $class->getConstructor())) {
233		$parameterValues = $this->resolveParameters(
234		$constructor->getParameters()
235		);
236		}
237
238		return $class->newInstanceArgs($parameterValues);
239		}
240
241		/**
242		* Recursively resolve function parameters using type hints
243		*
244		* @param \ReflectionParameter[]
245		* @return mixed
246		*/
247		private function resolveParameters(array $parameters): array
248		{
249		$values = [];
250
251		/**
252		* @var \ReflectionParameter $parameter
253		*/
254		foreach ($parameters as $parameter) {
255		if (($parameterClass = $parameter->getClass())) {
256		try {
257		$values[] = $this->get($parameterClass->getName());
258		}
259		catch (NotFoundException $e) { // We're probably dealing with an unmapped interface here
260		$values[] = $parameter->getDefaultValue();
261		}
262		} else {
263		$values[] = $parameter->getDefaultValue();
264		}
265		}
266
267		return $values;
268		}
269		}
270

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Pull Request — master (#3)

Container::getValueInstance() A

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