YieldPolyfillIterator::rewind() - Code Metrics - Inspection of "- Polyfill for the fetchRowsLazy yield/iterator" - rkrx/php-mysql-query-builder - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 23f593...5271f8 )

by Ron

created 2016-06-13 13:25 UTC

YieldPolyfillIterator::rewind() A

↳ Parent: YieldPolyfillIterator

Complexity

Conditions	2
Paths	2

Size

Total Lines	8
Code Lines	6

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
c	1
b	0
f	0
dl	0
loc	8
rs	9.4285
cc	2
eloc	6
nc	2
nop	0

<?php
namespace Kir\MySQL\Builder\Helpers;

use Closure;
use Iterator;
use Kir\MySQL\Builder\QueryStatement;
use Kir\MySQL\Builder\RunnableSelect;
use PDO;

class YieldPolyfillIterator implements Iterator {
	/** @var RunnableSelect */
	private $select;
	/** @var Closure|null */
	private $callback;
	/** @var bool */
	private $preserveTypes;
	/** @var null */
	private $stmt = null;
	/** @var Closure */
	private $statementFactory;
	/** @var mixed */
	private $currentItem;
	/** @var int */
	private $idx = -1;

	/**
	 * @param RunnableSelect $select
	 * @param Closure|null $callback
	 * @param bool $preserveTypes
	 * @param callable $statementFactory
	 */
	public function __construct(RunnableSelect $select, Closure $callback = null, $preserveTypes, $statementFactory) {
		$this->select = $select;
		$this->callback = $callback;
		$this->preserveTypes = $preserveTypes;
		$this->statementFactory = $statementFactory;

	}

	/**
	 */
	public function __destruct() {
		$this->closeCursor();
	}

	/**
	 * @return mixed
	 */
	public function current() {
		$row = $this->currentItem;
		if($this->preserveTypes) {
			$columnDefinitions = FieldTypeProvider::getFieldTypes($this->getStmt());
/** @return stdClass|null */
function mayReturnNull() { }

function doesNotAcceptNull(stdClass $x) { }

// With potential error.
function withoutCheck() {
    $x = mayReturnNull();
    doesNotAcceptNull($x); // Potential error here.
}

// Safe - Alternative 1
function withCheck1() {
    $x = mayReturnNull();
    if ( ! $x instanceof stdClass) {
        throw new \LogicException('$x must be defined.');
    }
    doesNotAcceptNull($x);
}

// Safe - Alternative 2
function withCheck2() {
    $x = mayReturnNull();
    if ($x instanceof stdClass) {
        doesNotAcceptNull($x);
    }
}
			$row = FieldValueConverter::convertValues($row, $columnDefinitions);
		}
		$callback = $this->callback;
		if($callback !== null) {
			$result = $callback($row);
			if($result instanceof DBIgnoreRow) {
if (rand(1, 6) > 3) {
//print "Check failed";
} else {
    print "Check succeeded";
}
				// Do nothing in this case
			} elseif($result !== null) {
				return $result;
			} else {
				return $row;
			}
		} else {
			return $row;
		}
	}

	/**
	 */
	public function next() {
		$this->idx++;
		$this->currentItem = $this->getStmt()->fetch(PDO::FETCH_ASSOC);
	}

	/**
	 * @return mixed
	 */
	public function key() {
		return $this->idx;
	}

	/**
	 * @return boolean
	 */
	public function valid() {
		$result = !!$this->currentItem;
		if(!$result) {
			$this->closeCursor();
		}
		return $result;
	}

	/**
	 */
	public function rewind() {
		if($this->stmt !== null) {
			throw new \Exception("It's not possible to rewind this iterator");
		}
		$this->stmt = call_user_func($this->statementFactory);
		$this->idx = -1;
		$this->next();
	}

	/**
	 * @return QueryStatement
	 */
	private function getStmt() {
		if($this->stmt === null) {
			$this->rewind();
		}
		return $this->stmt;
	}

	/**
	 */
	private function closeCursor() {
		if($this->stmt instanceof QueryStatement) {
			$this->stmt->closeCursor();
		}
		$this->stmt = null;
	}
}


1			<?php
2			namespace Kir\MySQL\Builder\Helpers;
3
4			use Closure;
5			use Iterator;
6			use Kir\MySQL\Builder\QueryStatement;
7			use Kir\MySQL\Builder\RunnableSelect;
8			use PDO;
9
10			class YieldPolyfillIterator implements Iterator {
11			/** @var RunnableSelect */
12			private $select;
13			/** @var Closure\|null */
14			private $callback;
15			/** @var bool */
16			private $preserveTypes;
17			/** @var null */
18			private $stmt = null;
19			/** @var Closure */
20			private $statementFactory;
21			/** @var mixed */
22			private $currentItem;
23			/** @var int */
24			private $idx = -1;
25
26			/**
27			* @param RunnableSelect $select
28			* @param Closure\|null $callback
29			* @param bool $preserveTypes
30			* @param callable $statementFactory
31			*/
32			public function __construct(RunnableSelect $select, Closure $callback = null, $preserveTypes, $statementFactory) {
33			$this->select = $select;
34			$this->callback = $callback;
35			$this->preserveTypes = $preserveTypes;
36			$this->statementFactory = $statementFactory;
			0 ignored issues – show Documentation Bug introduced 2016-06-13 13:28 UTC by Report Bug Copy Issue Report It seems like `$statementFactory` of type `callable` is incompatible with the declared type `object<Closure>` of property `$statementFactory`. Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property. Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property.. Loading history...
37			}
38
39			/**
40			*/
41			public function __destruct() {
42			$this->closeCursor();
43			}
44
45			/**
46			* @return mixed
47			*/
48			public function current() {
49			$row = $this->currentItem;
50			if($this->preserveTypes) {
51			$columnDefinitions = FieldTypeProvider::getFieldTypes($this->getStmt());
			0 ignored issues – show Bug introduced 2016-06-13 13:28 UTC by Report Bug Copy Issue Report It seems like `$this->getStmt()` can be `null`; however, `getFieldTypes()` does not accept `null`, maybe add an additional type check? Unless you are absolutely sure that the expression can never be null because of other conditions, we strongly recommend to add an additional type check to your code: /** @return stdClass\|null */ function mayReturnNull() { } function doesNotAcceptNull(stdClass $x) { } // With potential error. function withoutCheck() { $x = mayReturnNull(); doesNotAcceptNull($x); // Potential error here. } // Safe - Alternative 1 function withCheck1() { $x = mayReturnNull(); if ( ! $x instanceof stdClass) { throw new \LogicException('$x must be defined.'); } doesNotAcceptNull($x); } // Safe - Alternative 2 function withCheck2() { $x = mayReturnNull(); if ($x instanceof stdClass) { doesNotAcceptNull($x); } } Loading history...
52			$row = FieldValueConverter::convertValues($row, $columnDefinitions);
53			}
54			$callback = $this->callback;
55			if($callback !== null) {
56			$result = $callback($row);
57			if($result instanceof DBIgnoreRow) {
			0 ignored issues – show Unused Code introduced 2016-06-13 13:28 UTC by Report Bug Copy Issue Report This `if` statement is empty and can be removed. This check looks for the bodies of `if` statements that have no statements or where all statements have been commented out. This may be the result of changes for debugging or the code may simply be obsolete. These `if` bodies can be removed. If you have an empty if but statements in the `else` branch, consider inverting the condition. if (rand(1, 6) > 3) { //print "Check failed"; } else { print "Check succeeded"; } could be turned into if (rand(1, 6) <= 3) { print "Check succeeded"; } This is much more concise to read. Loading history...
58			// Do nothing in this case
59			} elseif($result !== null) {
60			return $result;
61			} else {
62			return $row;
63			}
64			} else {
65			return $row;
66			}
67			}
68
69			/**
70			*/
71			public function next() {
72			$this->idx++;
73			$this->currentItem = $this->getStmt()->fetch(PDO::FETCH_ASSOC);
74			}
75
76			/**
77			* @return mixed
78			*/
79			public function key() {
80			return $this->idx;
81			}
82
83			/**
84			* @return boolean
85			*/
86			public function valid() {
87			$result = !!$this->currentItem;
88			if(!$result) {
89			$this->closeCursor();
90			}
91			return $result;
92			}
93
94			/**
95			*/
96			public function rewind() {
97			if($this->stmt !== null) {
98			throw new \Exception("It's not possible to rewind this iterator");
99			}
100			$this->stmt = call_user_func($this->statementFactory);
101			$this->idx = -1;
102			$this->next();
103			}
104
105			/**
106			* @return QueryStatement
107			*/
108			private function getStmt() {
109			if($this->stmt === null) {
110			$this->rewind();
111			}
112			return $this->stmt;
113			}
114
115			/**
116			*/
117			private function closeCursor() {
118			if($this->stmt instanceof QueryStatement) {
119			$this->stmt->closeCursor();
120			}
121			$this->stmt = null;
122			}
123			}
124

rkrx / php-mysql-query-builder

Push — master ( 23f593...5271f8 )

YieldPolyfillIterator::rewind() A

Complexity

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Duplication

Importance

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