ValueObject::__construct() - Code Metrics - cn007b/vo - Measure and Improve Code Quality continuously with Scrutinizer

ValueObject::__construct() A
last analyzed 2018-08-16 13:15 UTC

↳ Parent: ValueObject

Complexity

Conditions	2
Paths	2

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	3
CRAP Score	2

Importance

Changes

Metric	Value
cc	2
nc	2
nop	1
dl	0
loc	13
ccs	3
cts	3
cp	1
crap	2
rs	9.8333
c	0
b	0
f	0

<?php

namespace ValueObject;

use Symfony\Component\Validator\ConstraintViolation;
use Symfony\Component\Validator\ConstraintViolationList;
use Symfony\Component\Validator\Validation;
use ValueObject\Exception\ParameterNotFoundException;
use ValueObject\Exception\ValidationException;
use Symfony\Component\Validator\Validator\ValidatorInterface;

abstract class ValueObject
{
    /**
     * This array contains VO parameters values which is already validated.
     *
     * @var array $params Validated params, which are available through magic method getParameterNameInCamelCase.
     */
    private $params = [];

    /**
     * This array contains validation errors.
     *
     * @var array $errors Validation errors.
     */
    private $errors = [];

    /**
     * Symfony validator instance.
     *
     * @var ValidatorInterface
     */
    private $validator;

    /**
     * Returns validation rules.
     *
     * This rules describes REQUIRED parameters.
     * Optional parameter must be resolved outside VO instance,
     * so only in this way we can ensure that VO have all parameters and they all valid.
     *
     * @return array Array with validation rules.
     */
    abstract protected function getRules();

    /**
     * Constructor.
     *
     * Most important method.
     * Here we validate received parameters against rules defined in method getRules,
     * and call after validation lifecycle callback.
     *
     * @param array $params Parameters being validated.
     *
     * @throws ValidationException In case when validation failed.
     */
    public function __construct(array $params)
    {
        // Initiate instance of Symfony validator.
        $this->validator = Validation::createValidator();

        $this->validate($params);
        $this->afterValidation($params);
        // In case when we obtain invalid parameter we throw error here,
        // this approach ensures that our VO have only valid parameters.
        if (0 !== count($this->errors)) {
            throw new ValidationException($this->errors);
        }
    }

    /**
     * Most important method. Here performs all validation stuff.
     *
     * @param array $params Parameters being validated.
     */
    private function validate(array $params)
    {
        /** @var array $rules */
        foreach ($this->getRules() as $paramName => $rules) {
            $constraints = $this->getConstraints($rules);
            // In the beginning of validation we must be sure that required parameter is passed to VO,
            // otherwise it will be first validation error.
            if (isset($params[$paramName])) {
                $value = $params[$paramName];
                // Performs Symfony validation.
                $this->validateParameter($paramName, $value, $constraints);
            } else {
                // We can not validate this parameter against validation rules,
                // because this parameter was not passed to VO.
                $this->setError($paramName, 'This parameter is required.');
            }
        }
    }

    /**
     * Gets validation constraints out from VO rules.
     *
     * One validation rule (parameter $rules) can have lot of constraints (Symfony constraints).
     * We must check them all,
     * so that's why here we build array with appropriate constraints for particular validation rule.
     * This array contains only constraints for only one validation rule,
     * for only one parameter which must be validated.
     *
     * @param array $rules Array of validation rules.
     *
     * @return array
     */
    private function getConstraints(array $rules)
    {
        $constraints = [];
        foreach ($rules as $constraintName => $options) {
            $constraintOptions = $options;
            // Constraint can be specified in simple way,
            // like string which is constraint name (for example: `'NotBlank'` etc).
            // Or as array with parameters, like:
            // array kes - is constraint name
            // and array value - constrain options (for example: `'Length' => ['min' => 5]`).
            if (!is_array($options)) {
                $constraintName = $options;
                $constraintOptions = [];
            }
            $constraintClassName = 'Symfony\Component\Validator\Constraints\\' . $constraintName;
            $constraints[] = new $constraintClassName($constraintOptions);
        }

        return $constraints;
    }

    /**
     * Validate parameter value against bunch of constraints.
     *
     * @param string $paramName Parameter name.
     * @param string $value Parameter value.
     * @param array $constraints Array of validation constraints.
     */
    private function validateParameter($paramName, $value, array $constraints)
    {
        $violations = $this->validator->validate($value, $constraints);
        if (0 === count($violations)) {
            // Parameter valid,
            // and only in this case we can store this parameter inside VO.
            // Thereby we ensure that our VO contains only valid parameters with only valid values.
            $this->params[$paramName] = $value;
        } else {
            // Parameter invalid,
            // so we can not store it inside VO,
            // we only can store error message about validation fail.
            $this->errors[$paramName] = $violations;
        }
    }

    /**
     * Sets error message for certain parameter.
     *
     * @param string $paramName Parameter name (key in array $parameters which is passed to __constructor method).
     * @param string $message Custom error message.
     */
    public function setError($paramName, $message)
    {
        $violation = new ConstraintViolation($message, '', [], '', $paramName, null);
        if (isset($this->errors[$paramName])) {
            // Adds error message to ConstraintViolationList.
            $this->errors[$paramName]->add($violation);
        } else {
            // Creates ConstraintViolationList and puts into it first error message.
            $this->errors[$paramName] = new ConstraintViolationList([$violation]);
        }
    }

    /**
     * Lifecycle callback - after validation.
     *
     * This method can be used for custom validation purposes.
     * This method will be called each time after validation rules (validate method).
     *
     * @param array $params Array with parameters passed to VO.
     */
    public function afterValidation(array $params)

    {}

    /**
     * Returns parameter value by parameter name.
     *
     * @param string $name Parameter name (key in array $parameters which is passed to __constructor method).
     * @param array $arguments Array with arguments.
     *
     * @throws ParameterNotFoundException In case when VO don't have needed parameter.
     *
     * @return mixed Parameter value.
     */
    public function __call($name, array $arguments)
    {
        $paramName = lcfirst(substr($name, 3));
        if (!isset($this->params[$paramName])) {
            throw new ParameterNotFoundException("Parameter: $name not found by name: $paramName.");
        }

        return $this->params[$paramName];
    }

    /**
     * Gets VO parameter as array.
     *
     * @return array Array which contains all VO parameters.
     */
    public function toArray()
    {
        return $this->params;
    }
}


1		<?php
2
3		namespace ValueObject;
4
5		use Symfony\Component\Validator\ConstraintViolation;
6		use Symfony\Component\Validator\ConstraintViolationList;
7		use Symfony\Component\Validator\Validation;
8		use ValueObject\Exception\ParameterNotFoundException;
9		use ValueObject\Exception\ValidationException;
10		use Symfony\Component\Validator\Validator\ValidatorInterface;
11
12		abstract class ValueObject
13		{
14		/**
15		* This array contains VO parameters values which is already validated.
16		*
17		* @var array $params Validated params, which are available through magic method getParameterNameInCamelCase.
18		*/
19		private $params = [];
20
21		/**
22		* This array contains validation errors.
23		*
24		* @var array $errors Validation errors.
25		*/
26		private $errors = [];
27
28		/**
29		* Symfony validator instance.
30		*
31		* @var ValidatorInterface
32		*/
33		private $validator;
34
35		/**
36		* Returns validation rules.
37		*
38		* This rules describes REQUIRED parameters.
39		* Optional parameter must be resolved outside VO instance,
40		* so only in this way we can ensure that VO have all parameters and they all valid.
41		*
42		* @return array Array with validation rules.
43		*/
44		abstract protected function getRules();
45
46		/**
47		* Constructor.
48		*
49	10	* Most important method.
50		* Here we validate received parameters against rules defined in method getRules,
51	10	* and call after validation lifecycle callback.
52	10	*
53		* @param array $params Parameters being validated.
54		*
55	10	* @throws ValidationException In case when validation failed.
56	6	*/
57		public function __construct(array $params)
58	4	{
59		// Initiate instance of Symfony validator.
60		$this->validator = Validation::createValidator();
61
62		$this->validate($params);
63		$this->afterValidation($params);
64		// In case when we obtain invalid parameter we throw error here,
65	10	// this approach ensures that our VO have only valid parameters.
66		if (0 !== count($this->errors)) {
67		throw new ValidationException($this->errors);
68	10	}
69		}
70
71	10	/**
72		* Most important method. Here performs all validation stuff.
73		*
74		* @param array $params Parameters being validated.
75		*/
76		private function validate(array $params)
77		{
78	10	/** @var array $rules */
79	10	foreach ($this->getRules() as $paramName => $rules) {
80		$constraints = $this->getConstraints($rules);
81		// In the beginning of validation we must be sure that required parameter is passed to VO,
82	10	// otherwise it will be first validation error.
83	10	if (isset($params[$paramName])) {
84	10	$value = $params[$paramName];
85		// Performs Symfony validation.
86	10	$this->validateParameter($paramName, $value, $constraints);
87	10	} else {
88		// We can not validate this parameter against validation rules,
89		// because this parameter was not passed to VO.
90		$this->setError($paramName, 'This parameter is required.');
91		}
92	10	}
93	9	}
94
95	9	/**
96	9	* Gets validation constraints out from VO rules.
97		*
98		* One validation rule (parameter $rules) can have lot of constraints (Symfony constraints).
99		* We must check them all,
100	9	* so that's why here we build array with appropriate constraints for particular validation rule.
101		* This array contains only constraints for only one validation rule,
102		* for only one parameter which must be validated.
103		*
104		* @param array $rules Array of validation rules.
105	9	*
106		* @return array
107		*/
108		private function getConstraints(array $rules)
109		{
110	10	$constraints = [];
111		foreach ($rules as $constraintName => $options) {
112		$constraintOptions = $options;
113		// Constraint can be specified in simple way,
114	10	// like string which is constraint name (for example: `'NotBlank'` etc).
115		// Or as array with parameters, like:
116		// array kes - is constraint name
117		// and array value - constrain options (for example: `'Length' => ['min' => 5]`).
118		if (!is_array($options)) {
119		$constraintName = $options;
120		$constraintOptions = [];
121		}
122	6	$constraintClassName = 'Symfony\Component\Validator\Constraints\\' . $constraintName;
123		$constraints[] = new $constraintClassName($constraintOptions);
124	6	}
125	6
126		return $constraints;
127	2	}
128
129		/**
130	4	* Validate parameter value against bunch of constraints.
131		*
132	6	* @param string $paramName Parameter name.
133		* @param string $value Parameter value.
134		* @param array $constraints Array of validation constraints.
135		*/
136		private function validateParameter($paramName, $value, array $constraints)
137		{
138		$violations = $this->validator->validate($value, $constraints);
139		if (0 === count($violations)) {
140		// Parameter valid,
141		// and only in this case we can store this parameter inside VO.
142	3	// Thereby we ensure that our VO contains only valid parameters with only valid values.
143	3	$this->params[$paramName] = $value;
144		} else {
145		// Parameter invalid,
146		// so we can not store it inside VO,
147		// we only can store error message about validation fail.
148		$this->errors[$paramName] = $violations;
149		}
150		}
151
152		/**
153		* Sets error message for certain parameter.
154		*
155	2	* @param string $paramName Parameter name (key in array $parameters which is passed to __constructor method).
156		* @param string $message Custom error message.
157	2	*/
158	2	public function setError($paramName, $message)
159	1	{
160		$violation = new ConstraintViolation($message, '', [], '', $paramName, null);
161	1	if (isset($this->errors[$paramName])) {
162		// Adds error message to ConstraintViolationList.
163		$this->errors[$paramName]->add($violation);
164		} else {
165		// Creates ConstraintViolationList and puts into it first error message.
166		$this->errors[$paramName] = new ConstraintViolationList([$violation]);
167		}
168		}
169	1
170		/**
171	1	* Lifecycle callback - after validation.
172		*
173		* This method can be used for custom validation purposes.
174		* This method will be called each time after validation rules (validate method).
175		*
176		* @param array $params Array with parameters passed to VO.
177		*/
178		public function afterValidation(array $params)
		0 ignored issues – show Unused Code introduced 2017-12-14 16:18 UTC by Report Bug Copy Issue Report The parameter `$params` is not used and could be removed. This check looks from parameters that have been defined for a function or method, but which are not used in the method body. Loading history...
179		{}
180
181		/**
182		* Returns parameter value by parameter name.
183		*
184		* @param string $name Parameter name (key in array $parameters which is passed to __constructor method).
185		* @param array $arguments Array with arguments.
186		*
187		* @throws ParameterNotFoundException In case when VO don't have needed parameter.
188		*
189		* @return mixed Parameter value.
190		*/
191		public function __call($name, array $arguments)
192		{
193		$paramName = lcfirst(substr($name, 3));
194		if (!isset($this->params[$paramName])) {
195		throw new ParameterNotFoundException("Parameter: $name not found by name: $paramName.");
196		}
197
198		return $this->params[$paramName];
199		}
200
201		/**
202		* Gets VO parameter as array.
203		*
204		* @return array Array which contains all VO parameters.
205		*/
206		public function toArray()
207		{
208		return $this->params;
209		}
210		}
211

cn007b / vo

ValueObject::__construct() A last analyzed 2018-08-16 13:15 UTC

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ValueObject::__construct() A
last analyzed 2018-08-16 13:15 UTC