AbstractFactory::createClass() - Code Metrics - Inspection of "All factory options to be set on constructor. Hand..." - locomotivemtl/charcoal-factory - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( a8fb97...ba7e2b )

by Mathieu

created 2016-05-18 11:48 UTC

AbstractFactory::createClass() B

↳ Parent: AbstractFactory

Complexity

Conditions	5
Paths	5

Size

Total Lines	21
Code Lines	13

Duplication

Lines	0
Ratio	0 %

Metric	Value
dl	0
loc	21
rs	8.7624
cc	5
eloc	13
nc	5
nop	2

<?php

namespace Charcoal\Factory;

// Dependencies from `PHP`
use \Exception;
use \InvalidArgumentException;

// Local namespace dependencies
use \Charcoal\Factory\FactoryInterface;

/**
 * Full implementation, as Abstract class, of the FactoryInterface.
 */
abstract class AbstractFactory implements FactoryInterface
{
    /**
     * @var array $resolved
     */
    static protected $resolved = [];

    /**
     * If a base class is set, then it must be ensured that the
     * @var string $baseClass
     */
    private $baseClass = '';
    /**
     *
     * @var string $defaultClass
     */
    private $defaultClass = '';

    /**
     * @var array $arguments
     */
    private $arguments;

    /**
     * @var callable $callback
     */
    private $callback;

    /**
     * Keeps loaded instances in memory, in `[$type => $instance]` format.
     * Used with the `get()` method only.
     * @var array $instances
     */
    private $instances = [];

    /**
     * @param array $data Constructor dependencies.
     */
    public function __construct(array $data=null)
    {
        if (isset($data['arguments'])) {
            $this->setArguments($data['arguments']);
        }
        if (isset($data['callback'])) {
            $this->setCallback($data['callback']);
        }
        if (isset($data['base_class'])) {
            $this->setBaseClass($data['base_class']);
        }
        if (isset($data['default_class'])) {
            $this->setDefaultClass($data['default_class']);
        }
    }

    /**
     * Create a new instance of a class, by type.
     *
     * Unlike `get()`, this method *always* return a new instance of the requested class.
     *
     * ## Object callback
     * It is possible to pass a callback method that will be executed upon object instanciation.
     * The callable should have a signature: `function($obj);` where $obj is the newly created object.
     *
     *
     * @param string   $type The type (class ident).
     * @param array    $args Optional. The constructor arguments. Leave blank to use `$arguments` member.
     * @param callable $cb   Optional. Object callback, called at creation. Leave blank to use `$callback` member.
     * @throws Exception If the base class is set and  the resulting instance is not of the base class.
     * @throws InvalidArgumentException If type argument is not a string or is not an available type.
     * @return mixed The instance / object
     */
    final public function create($type, array $args = null, callable $cb = null)
    {
        if (!is_string($type)) {
            throw new InvalidArgumentException(
                sprintf(
                    '%s: Type must be a string.',
                    get_called_class()
                )
            );
        }

        if (!isset($args)) {
            $args = $this->arguments();
        }

        if (!isset($cb)) {
            $cb = $this->callback();
        }

        $pool = get_called_class();
        if (isset(self::$resolved[$pool][$type])) {
            $classname = self::$resolved[$pool][$type];
        } else {
            if ($this->isResolvable($type) === false) {
                $defaultClass = $this->defaultClass();
                if ($defaultClass !== '') {
                    $obj = $this->createClass($defaultClass, $args);
$myVar = 'Value';
$higher = false;

if (rand(1, 6) > 3) {
    $higher = true;
} else {
    $higher = false;
}
                    $obj = new $defaultClass($args);
                    if (isset($cb)) {
                        $cb($obj);
                    }
                    return $obj;
                } else {
                    throw new InvalidArgumentException(
                        sprintf(
                            '%1$s: Type "%2$s" is not a valid type. (Using default class "%3$s")',
                            get_called_class(),
                            $type,
                            $defaultClass
                        )
                    );
                }
            }

            // Create the object from the type's class name.
            $classname = $this->resolve($type);
            self::$resolved[$pool][$type] = $classname;
        }

        $obj = $this->createClass($classname, $args);

        // Ensure base class is respected, if set.
        $baseClass = $this->baseClass();
        if ($baseClass !== '' && !($obj instanceof $baseClass)) {
            throw new Exception(
                sprintf(
                    '%1$s: Object is not a valid "%2$s" class',
                    get_called_class(),
                    $baseClass
                )
            );
        }

        if (isset($cb)) {
            $cb($obj);
        }

        return $obj;
    }

    /**
     * Create a class instance with given arguments.
     *
     * How the constructor arguments are passed depends on its type:
     *
     * - if null, no arguments are passed at all.
     * - if it's not an array, it's passed as a single argument.
     * - if it's an associative array, it's passed as a sing argument.
     * - if it's a sequential (numeric keys) array, it's
     */
    public function createClass($classname, $args)
    {
        if ($args === null) {
            return new $classname;
        }
        if (!is_array($args)) {
            return new $classname($args);
        }
        if (count(array_filter(array_keys($args), 'is_string')) > 0) {

            return new $classname($args);
        } else {
            if (version_compare(PHP_VERSION, '5.6.0') >= 0) {
                $obj = new $classname(...$args);
$myVar = 'Value';
$higher = false;

if (rand(1, 6) > 3) {
    $higher = true;
} else {
    $higher = false;
}
            } else {
                // PHP under 5.6 does not support argument unpacking.
                $reflection = new \ReflectionClass($classname);
                $obj = $reflection->newInstanceArgs($args);
$myVar = 'Value';
$higher = false;

if (rand(1, 6) > 3) {
    $higher = true;
} else {
    $higher = false;
}
            }
        }
    }

    /**
     * Get (load or create) an instance of a class, by type.
     *
     * Unlike `create()` (which always call a `new` instance), this function first tries to load / reuse
     * an already created object of this type, from memory.
     *
     * @param string $type The type (class ident).
     * @param array  $args The constructor arguments (optional).
     * @throws InvalidArgumentException If type argument is not a string.
     * @return mixed The instance / object
     */
    final public function get($type, array $args = null)
    {
        if (!is_string($type)) {
            throw new InvalidArgumentException(
                'Type must be a string.'
            );
        }
        if (!isset($this->instances[$type]) || $this->instances[$type] === null) {
            $this->instances[$type] = $this->create($type, $args);
        }
        return $this->instances[$type];
    }

    /**
     * If a base class is set, then it must be ensured that the created objects
     * are `instanceof` this base class.
     *
     * @param string $type The FQN of the class, or "type" of object, to set as base class.
     * @throws InvalidArgumentException If the class is not a string or is not an existing class / interface.
     * @return FactoryInterface
     */
    public function setBaseClass($type)
    {
        if (!is_string($type) || empty($type)) {
            throw new InvalidArgumentException(
                'Class name or type must be a non-empty string.'
            );
        }

        $exists = (class_exists($type) || interface_exists($type));
        if ($exists) {
            $classname = $type;
        } else {

            $classname = $this->resolve($type);

            $exists = (class_exists($classname) || interface_exists($classname));
            if (!$exists) {
                throw new InvalidArgumentException(
                    sprintf('Can not set "%s" as base class: Invalid class or interface name.', $classname)
                );
            }
        }

        $this->baseClass = $classname;

        return $this;
    }

    /**
     * @return string The FQN of the base class
     */
    public function baseClass()
    {
        return $this->baseClass;
    }

    /**
     * If a default class is set, then calling `get()` or `create()` an invalid type
     * should return an object of this class instead of throwing an error.
     *
     * @param string $type The FQN of the class, or "type" of object, to set as default class.
     * @throws InvalidArgumentException If the class name is not a string or not a valid class.
     * @return FactoryInterface
     */
    public function setDefaultClass($type)
    {
        if (!is_string($type) || empty($type)) {
            throw new InvalidArgumentException(
                'Class name or type must be a non-empty string.'
            );
        }

        if (class_exists($type)) {

            $classname = $type;
        } else {
            $classname = $this->resolve($type);

            if (!class_exists($classname)) {
                throw new InvalidArgumentException(
                    sprintf('Can not set "%s" as defaut class: Invalid class name.', $classname)
                );
            }
        }

        $this->defaultClass = $classname;

        return $this;
    }

    /**
     * @return string The FQN of the default class
     */
    public function defaultClass()
    {
        return $this->defaultClass;
    }

    /**
     * @param array $arguments The constructor arguments to be passed to the created object's initialization.
     * @return AbstractFactory Chainable
     */
    public function setArguments(array $arguments)
    {
        $this->arguments = $arguments;
        return $this;
    }

    /**
     * @return array
     */
    public function arguments()
    {
        return $this->arguments;
    }

    /**
     * @param callable $callback The object callback.
     * @return AbstractFatory Chainable
     */
    public function setCallback(callable $callback)
    {
        $this->callback = $callback;
        return $this;
    }

    /**
     * @return callable|null
     */
    public function callback()
    {
        return $this->callback;
    }

    /**
     * Resolve the class name from "type".
     *
     * @param string $type The "type" of object to resolve (the object ident).
     * @return string The resolved class name (FQN).
     */
    abstract public function resolve($type);

    /**
     * Returns wether a type is resolvable (is valid).
     *
     * @param string $type The "type" of object to resolve (the object ident).
     * @return boolean True if the type is available, false if not
     */
    abstract public function isResolvable($type);
}


1		<?php
2
3		namespace Charcoal\Factory;
4
5		// Dependencies from `PHP`
6		use \Exception;
7		use \InvalidArgumentException;
8
9		// Local namespace dependencies
10		use \Charcoal\Factory\FactoryInterface;
11
12		/**
13		* Full implementation, as Abstract class, of the FactoryInterface.
14		*/
15		abstract class AbstractFactory implements FactoryInterface
16		{
17		/**
18		* @var array $resolved
19		*/
20		static protected $resolved = [];
21
22		/**
23		* If a base class is set, then it must be ensured that the
24		* @var string $baseClass
25		*/
26		private $baseClass = '';
27		/**
28		*
29		* @var string $defaultClass
30		*/
31		private $defaultClass = '';
32
33		/**
34		* @var array $arguments
35		*/
36		private $arguments;
37
38		/**
39		* @var callable $callback
40		*/
41		private $callback;
42
43		/**
44		* Keeps loaded instances in memory, in `[$type => $instance]` format.
45		* Used with the `get()` method only.
46		* @var array $instances
47		*/
48		private $instances = [];
49
50		/**
51		* @param array $data Constructor dependencies.
52		*/
53		public function __construct(array $data=null)
54		{
55		if (isset($data['arguments'])) {
56		$this->setArguments($data['arguments']);
57		}
58		if (isset($data['callback'])) {
59		$this->setCallback($data['callback']);
60		}
61		if (isset($data['base_class'])) {
62		$this->setBaseClass($data['base_class']);
63		}
64		if (isset($data['default_class'])) {
65		$this->setDefaultClass($data['default_class']);
66		}
67		}
68
69		/**
70		* Create a new instance of a class, by type.
71		*
72		* Unlike `get()`, this method always return a new instance of the requested class.
73		*
74		* ## Object callback
75		* It is possible to pass a callback method that will be executed upon object instanciation.
76		* The callable should have a signature: `function($obj);` where $obj is the newly created object.
77		*
78		*
79		* @param string $type The type (class ident).
80		* @param array $args Optional. The constructor arguments. Leave blank to use `$arguments` member.
81		* @param callable $cb Optional. Object callback, called at creation. Leave blank to use `$callback` member.
82		* @throws Exception If the base class is set and the resulting instance is not of the base class.
83		* @throws InvalidArgumentException If type argument is not a string or is not an available type.
84		* @return mixed The instance / object
85		*/
86		final public function create($type, array $args = null, callable $cb = null)
87		{
88		if (!is_string($type)) {
89		throw new InvalidArgumentException(
90		sprintf(
91		'%s: Type must be a string.',
92		get_called_class()
93		)
94		);
95		}
96
97		if (!isset($args)) {
98		$args = $this->arguments();
99		}
100
101		if (!isset($cb)) {
102		$cb = $this->callback();
103		}
104
105		$pool = get_called_class();
106		if (isset(self::$resolved[$pool][$type])) {
107		$classname = self::$resolved[$pool][$type];
108		} else {
109		if ($this->isResolvable($type) === false) {
110		$defaultClass = $this->defaultClass();
111		if ($defaultClass !== '') {
112		$obj = $this->createClass($defaultClass, $args);
		0 ignored issues – show Unused Code introduced 2016-05-18 11:53 UTC by Report Bug Copy Issue Report `$obj` is not used, you could remove the assignment. This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently. $myVar = 'Value'; $higher = false; if (rand(1, 6) > 3) { $higher = true; } else { $higher = false; } Both the `$myVar` assignment in line 1 and the `$higher` assignment in line 2 are dead. The first because `$myVar` is never used and the second because `$higher` is always overwritten for every possible time line. Loading history...
113		$obj = new $defaultClass($args);
114		if (isset($cb)) {
115		$cb($obj);
116		}
117		return $obj;
118		} else {
119		throw new InvalidArgumentException(
120		sprintf(
121		'%1$s: Type "%2$s" is not a valid type. (Using default class "%3$s")',
122		get_called_class(),
123		$type,
124		$defaultClass
125		)
126		);
127		}
128		}
129
130		// Create the object from the type's class name.
131		$classname = $this->resolve($type);
132		self::$resolved[$pool][$type] = $classname;
133		}
134
135		$obj = $this->createClass($classname, $args);
136
137		// Ensure base class is respected, if set.
138		$baseClass = $this->baseClass();
139		if ($baseClass !== '' && !($obj instanceof $baseClass)) {
140		throw new Exception(
141		sprintf(
142		'%1$s: Object is not a valid "%2$s" class',
143		get_called_class(),
144		$baseClass
145		)
146		);
147		}
148
149		if (isset($cb)) {
150		$cb($obj);
151		}
152
153		return $obj;
154		}
155
156		/**
157		* Create a class instance with given arguments.
158		*
159		* How the constructor arguments are passed depends on its type:
160		*
161		* - if null, no arguments are passed at all.
162		* - if it's not an array, it's passed as a single argument.
163		* - if it's an associative array, it's passed as a sing argument.
164		* - if it's a sequential (numeric keys) array, it's
165		*/
166		public function createClass($classname, $args)
167		{
168		if ($args === null) {
169		return new $classname;
170		}
171		if (!is_array($args)) {
172		return new $classname($args);
173		}
174		if (count(array_filter(array_keys($args), 'is_string')) > 0) {
175
176		return new $classname($args);
177		} else {
178		if (version_compare(PHP_VERSION, '5.6.0') >= 0) {
179		$obj = new $classname(...$args);
		0 ignored issues – show Unused Code introduced 2016-05-18 11:53 UTC by Report Bug Copy Issue Report `$obj` is not used, you could remove the assignment. This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently. $myVar = 'Value'; $higher = false; if (rand(1, 6) > 3) { $higher = true; } else { $higher = false; } Both the `$myVar` assignment in line 1 and the `$higher` assignment in line 2 are dead. The first because `$myVar` is never used and the second because `$higher` is always overwritten for every possible time line. Loading history...
180		} else {
181		// PHP under 5.6 does not support argument unpacking.
182		$reflection = new \ReflectionClass($classname);
183		$obj = $reflection->newInstanceArgs($args);
		0 ignored issues – show Unused Code introduced 2016-05-18 11:53 UTC by Report Bug Copy Issue Report `$obj` is not used, you could remove the assignment. This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently. $myVar = 'Value'; $higher = false; if (rand(1, 6) > 3) { $higher = true; } else { $higher = false; } Both the `$myVar` assignment in line 1 and the `$higher` assignment in line 2 are dead. The first because `$myVar` is never used and the second because `$higher` is always overwritten for every possible time line. Loading history...
184		}
185		}
186		}
187
188		/**
189		* Get (load or create) an instance of a class, by type.
190		*
191		* Unlike `create()` (which always call a `new` instance), this function first tries to load / reuse
192		* an already created object of this type, from memory.
193		*
194		* @param string $type The type (class ident).
195		* @param array $args The constructor arguments (optional).
196		* @throws InvalidArgumentException If type argument is not a string.
197		* @return mixed The instance / object
198		*/
199		final public function get($type, array $args = null)
200		{
201		if (!is_string($type)) {
202		throw new InvalidArgumentException(
203		'Type must be a string.'
204		);
205		}
206		if (!isset($this->instances[$type]) \|\| $this->instances[$type] === null) {
207		$this->instances[$type] = $this->create($type, $args);
208		}
209		return $this->instances[$type];
210		}
211
212		/**
213		* If a base class is set, then it must be ensured that the created objects
214		* are `instanceof` this base class.
215		*
216		* @param string $type The FQN of the class, or "type" of object, to set as base class.
217		* @throws InvalidArgumentException If the class is not a string or is not an existing class / interface.
218		* @return FactoryInterface
219		*/
220		public function setBaseClass($type)
221		{
222		if (!is_string($type) \|\| empty($type)) {
223		throw new InvalidArgumentException(
224		'Class name or type must be a non-empty string.'
225		);
226		}
227
228		$exists = (class_exists($type) \|\| interface_exists($type));
229		if ($exists) {
230		$classname = $type;
231	View Code Duplication	} else {
		0 ignored issues – show Duplication introduced 2015-12-08 18:26 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
232		$classname = $this->resolve($type);
233
234		$exists = (class_exists($classname) \|\| interface_exists($classname));
235		if (!$exists) {
236		throw new InvalidArgumentException(
237		sprintf('Can not set "%s" as base class: Invalid class or interface name.', $classname)
238		);
239		}
240		}
241
242		$this->baseClass = $classname;
243
244		return $this;
245		}
246
247		/**
248		* @return string The FQN of the base class
249		*/
250		public function baseClass()
251		{
252		return $this->baseClass;
253		}
254
255		/**
256		* If a default class is set, then calling `get()` or `create()` an invalid type
257		* should return an object of this class instead of throwing an error.
258		*
259		* @param string $type The FQN of the class, or "type" of object, to set as default class.
260		* @throws InvalidArgumentException If the class name is not a string or not a valid class.
261		* @return FactoryInterface
262		*/
263		public function setDefaultClass($type)
264		{
265		if (!is_string($type) \|\| empty($type)) {
266		throw new InvalidArgumentException(
267		'Class name or type must be a non-empty string.'
268		);
269		}
270
271	View Code Duplication	if (class_exists($type)) {
		0 ignored issues – show Duplication introduced 2015-12-08 18:26 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
272		$classname = $type;
273		} else {
274		$classname = $this->resolve($type);
275
276		if (!class_exists($classname)) {
277		throw new InvalidArgumentException(
278		sprintf('Can not set "%s" as defaut class: Invalid class name.', $classname)
279		);
280		}
281		}
282
283		$this->defaultClass = $classname;
284
285		return $this;
286		}
287
288		/**
289		* @return string The FQN of the default class
290		*/
291		public function defaultClass()
292		{
293		return $this->defaultClass;
294		}
295
296		/**
297		* @param array $arguments The constructor arguments to be passed to the created object's initialization.
298		* @return AbstractFactory Chainable
299		*/
300		public function setArguments(array $arguments)
301		{
302		$this->arguments = $arguments;
303		return $this;
304		}
305
306		/**
307		* @return array
308		*/
309		public function arguments()
310		{
311		return $this->arguments;
312		}
313
314		/**
315		* @param callable $callback The object callback.
316		* @return AbstractFatory Chainable
317		*/
318		public function setCallback(callable $callback)
319		{
320		$this->callback = $callback;
321		return $this;
322		}
323
324		/**
325		* @return callable\|null
326		*/
327		public function callback()
328		{
329		return $this->callback;
330		}
331
332		/**
333		* Resolve the class name from "type".
334		*
335		* @param string $type The "type" of object to resolve (the object ident).
336		* @return string The resolved class name (FQN).
337		*/
338		abstract public function resolve($type);
339
340		/**
341		* Returns wether a type is resolvable (is valid).
342		*
343		* @param string $type The "type" of object to resolve (the object ident).
344		* @return boolean True if the type is available, false if not
345		*/
346		abstract public function isResolvable($type);
347		}
348

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