Paginator::count() - Code Metrics - Inspection of "[Paginator] Fix regression when using Custom ID ty..." - doctrine/orm - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — 2.6 (#7903)

by Gabriel

created 2019-11-16 11:24 UTC

Paginator::count() A

↳ Parent: Paginator

Complexity

Conditions	3
Paths	3

Size

Total Lines	11
Code Lines	6

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	5
CRAP Score	3.0416

Importance

Changes

Metric	Value
cc	3
eloc	6
nc	3
nop	0
dl	0
loc	11
ccs	5
cts	6
cp	0.8333
crap	3.0416
rs	10
c	0
b	0
f	0

<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\ORM\Tools\Pagination;

use Doctrine\ORM\EntityManagerInterface;
use Doctrine\ORM\Mapping\MappingException;
use Doctrine\ORM\NoResultException;
use Doctrine\ORM\Query;
use Doctrine\ORM\Query\Parser;
use Doctrine\ORM\Query\ResultSetMapping;
use Doctrine\ORM\QueryBuilder;
use function array_map;
use function assert;
use function current;

/**
 * The paginator can handle various complex scenarios with DQL.
 *
 * @author Pablo Díez <[email protected]>
 * @author Benjamin Eberlei <[email protected]>
 * @license New BSD
 */
class Paginator implements \Countable, \IteratorAggregate
{
    /**
     * @var Query
     */
    private $query;

    /**
     * @var bool
     */
    private $fetchJoinCollection;

    /**
     * @var bool|null
     */
    private $useOutputWalkers;

    /**
     * @var int
     */
    private $count;

    /**
     * Constructor.
     *
     * @param Query|QueryBuilder $query               A Doctrine ORM query or query builder.
     * @param boolean            $fetchJoinCollection Whether the query joins a collection (true by default).
     */
    public function __construct($query, $fetchJoinCollection = true)
    {
        if ($query instanceof QueryBuilder) {
            $query = $query->getQuery();
        }

        $this->query = $query;
        $this->fetchJoinCollection = (bool) $fetchJoinCollection;
    }

    /**
     * Returns the query.
     *
     * @return Query
     */
    public function getQuery()
    {
        return $this->query;
    }

    /**
     * Returns whether the query joins a collection.
     *
     * @return boolean Whether the query joins a collection.
     */
    public function getFetchJoinCollection()
    {
        return $this->fetchJoinCollection;
    }

    /**
     * Returns whether the paginator will use an output walker.
     *
     * @return bool|null
     */
    public function getUseOutputWalkers()
    {
        return $this->useOutputWalkers;
    }

    /**
     * Sets whether the paginator will use an output walker.
     *
     * @param bool|null $useOutputWalkers
     *
     * @return $this
     */
    public function setUseOutputWalkers($useOutputWalkers)
    {
        $this->useOutputWalkers = $useOutputWalkers;

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function count()
    {
        if ($this->count === null) {
            try {
                $this->count = array_sum(array_map('current', $this->getCountQuery()->getScalarResult()));
            } catch (NoResultException $e) {
                $this->count = 0;
            }
        }

        return $this->count;
    }

    /**
     * {@inheritdoc}
     */
    public function getIterator()
    {
        $offset = $this->query->getFirstResult();
        $length = $this->query->getMaxResults();

        if ($this->fetchJoinCollection) {
            $subQuery = $this->cloneQuery($this->query);

            if ($this->useOutputWalker($subQuery)) {
                $subQuery->setHint(Query::HINT_CUSTOM_OUTPUT_WALKER, LimitSubqueryOutputWalker::class);
            } else {
                $this->appendTreeWalker($subQuery, LimitSubqueryWalker::class);
                $this->unbindUnusedQueryParams($subQuery);
            }

            $subQuery->setFirstResult($offset)->setMaxResults($length);

            $foundIdRows = $subQuery->getScalarResult();

            // don't do this for an empty id array
            if ($foundIdRows === []) {
                return new \ArrayIterator([]);
            }

            $em           = $subQuery->getEntityManager();
            $connection   = $em->getConnection();
            $idType       = $this->getIdentifiersQueryScalarResultType($subQuery, $em);
            $whereInQuery = $this->cloneQuery($this->query);
            $ids          = array_map(static function (array $row) use ($idType, $connection) {
                return $connection->convertToPHPValue(current($row), $idType);
            }, $foundIdRows);

            $this->appendTreeWalker($whereInQuery, WhereInWalker::class);
            $whereInQuery->setHint(WhereInWalker::HINT_PAGINATOR_ID_COUNT, count($ids));
            $whereInQuery->setFirstResult(null)->setMaxResults(null);
            $whereInQuery->setParameter(WhereInWalker::PAGINATOR_ID_ALIAS, $ids);
            $whereInQuery->setCacheable($this->query->isCacheable());
            $whereInQuery->expireQueryCache();

            $result = $whereInQuery->getResult($this->query->getHydrationMode());
        } else {
            $result = $this->cloneQuery($this->query)
                ->setMaxResults($length)
                ->setFirstResult($offset)
                ->setCacheable($this->query->isCacheable())
                ->getResult($this->query->getHydrationMode())
            ;
        }

        return new \ArrayIterator($result);
    }

    /**
     * Clones a query.
     *
     * @param Query $query The query.
     *
     * @return Query The cloned query.
     */
    private function cloneQuery(Query $query)
    {
        /* @var $cloneQuery Query */
        $cloneQuery = clone $query;

        $cloneQuery->setParameters(clone $query->getParameters());
        $cloneQuery->setCacheable(false);

        foreach ($query->getHints() as $name => $value) {
            $cloneQuery->setHint($name, $value);
        }

        return $cloneQuery;
    }

    /**
     * Determines whether to use an output walker for the query.
     *
     * @param Query $query The query.
     *
     * @return bool
     */
    private function useOutputWalker(Query $query)
    {
        if ($this->useOutputWalkers === null) {
            return (bool) $query->getHint(Query::HINT_CUSTOM_OUTPUT_WALKER) === false;
        }

        return $this->useOutputWalkers;
    }

    /**
     * Appends a custom tree walker to the tree walkers hint.
     *
     * @param Query  $query
     * @param string $walkerClass
     */
    private function appendTreeWalker(Query $query, $walkerClass)
    {
        $hints = $query->getHint(Query::HINT_CUSTOM_TREE_WALKERS);

        if ($hints === false) {
            $hints = [];
        }

        $hints[] = $walkerClass;
        $query->setHint(Query::HINT_CUSTOM_TREE_WALKERS, $hints);
    }

    /**
     * Returns Query prepared to count.
     *
     * @return Query
     */
    private function getCountQuery()
    {
        /* @var $countQuery Query */
        $countQuery = $this->cloneQuery($this->query);

        if ( ! $countQuery->hasHint(CountWalker::HINT_DISTINCT)) {
            $countQuery->setHint(CountWalker::HINT_DISTINCT, true);
        }

        if ($this->useOutputWalker($countQuery)) {
            $platform = $countQuery->getEntityManager()->getConnection()->getDatabasePlatform(); // law of demeter win

            $rsm = new ResultSetMapping();
            $rsm->addScalarResult($platform->getSQLResultCasing('dctrn_count'), 'count');

            $countQuery->setHint(Query::HINT_CUSTOM_OUTPUT_WALKER, CountOutputWalker::class);
            $countQuery->setResultSetMapping($rsm);
        } else {
            $this->appendTreeWalker($countQuery, CountWalker::class);
            $this->unbindUnusedQueryParams($countQuery);
        }

        $countQuery->setFirstResult(null)->setMaxResults(null);

        return $countQuery;
    }

    private function unbindUnusedQueryParams(Query $query): void
    {
        $parser            = new Parser($query);
        $parameterMappings = $parser->parse()->getParameterMappings();
        /* @var $parameters \Doctrine\Common\Collections\Collection|\Doctrine\ORM\Query\Parameter[] */
        $parameters        = $query->getParameters();

        foreach ($parameters as $key => $parameter) {
            $parameterName = $parameter->getName();

            if ( ! (isset($parameterMappings[$parameterName]) || array_key_exists($parameterName, $parameterMappings))) {
                unset($parameters[$key]);
            }
        }

        $query->setParameters($parameters);
    }

    /**
     * Parses a query that is supposed to fetch a set of entity identifier only,
     * and retrieves the type of said identifier.
     *
     * @throws MappingException If metadata couldn't be loaded, or if there isn't a single
     *                          identifier for the given query.
     */
    private function getIdentifiersQueryScalarResultType(
        Query $query,
        EntityManagerInterface $em
    ) : ?string {
        $rsm = (new Parser($query))
            ->parse()
            ->getResultSetMapping();

        assert($rsm !== null);
        assert($rsm->isSelect);

        return $rsm->getTypeOfSelectionRootSingleIdentifierColumn($em);
    }
}


1		<?php
2		/*
3		* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
4		* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
5		* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
6		* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
7		* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
8		* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
9		* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
10		* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
11		* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
12		* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
13		* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
14		*
15		* This software consists of voluntary contributions made by many individuals
16		* and is licensed under the MIT license. For more information, see
17		* <http://www.doctrine-project.org>.
18		*/
19
20		namespace Doctrine\ORM\Tools\Pagination;
21
22		use Doctrine\ORM\EntityManagerInterface;
23		use Doctrine\ORM\Mapping\MappingException;
24		use Doctrine\ORM\NoResultException;
25		use Doctrine\ORM\Query;
26		use Doctrine\ORM\Query\Parser;
27		use Doctrine\ORM\Query\ResultSetMapping;
28		use Doctrine\ORM\QueryBuilder;
29		use function array_map;
30		use function assert;
31		use function current;
32
33		/**
34		* The paginator can handle various complex scenarios with DQL.
35		*
36		* @author Pablo Díez <[email protected]>
37		* @author Benjamin Eberlei <[email protected]>
38		* @license New BSD
39		*/
40		class Paginator implements \Countable, \IteratorAggregate
41		{
42		/**
43		* @var Query
44		*/
45		private $query;
46
47		/**
48		* @var bool
49		*/
50		private $fetchJoinCollection;
51
52		/**
53		* @var bool\|null
54		*/
55		private $useOutputWalkers;
56
57		/**
58		* @var int
59		*/
60		private $count;
61
62		/**
63		* Constructor.
64		*
65		* @param Query\|QueryBuilder $query A Doctrine ORM query or query builder.
66		* @param boolean $fetchJoinCollection Whether the query joins a collection (true by default).
67		*/
68	111	public function __construct($query, $fetchJoinCollection = true)
69		{
70	111	if ($query instanceof QueryBuilder) {
71	2	$query = $query->getQuery();
72		}
73
74	111	$this->query = $query;
75	111	$this->fetchJoinCollection = (bool) $fetchJoinCollection;
76	111	}
77
78		/**
79		* Returns the query.
80		*
81		* @return Query
82		*/
83		public function getQuery()
84		{
85		return $this->query;
86		}
87
88		/**
89		* Returns whether the query joins a collection.
90		*
91		* @return boolean Whether the query joins a collection.
92		*/
93		public function getFetchJoinCollection()
94		{
95		return $this->fetchJoinCollection;
96		}
97
98		/**
99		* Returns whether the paginator will use an output walker.
100		*
101		* @return bool\|null
102		*/
103		public function getUseOutputWalkers()
104		{
105		return $this->useOutputWalkers;
106		}
107
108		/**
109		* Sets whether the paginator will use an output walker.
110		*
111		* @param bool\|null $useOutputWalkers
112		*
113		* @return $this
114		*/
115	98	public function setUseOutputWalkers($useOutputWalkers)
116		{
117	98	$this->useOutputWalkers = $useOutputWalkers;
118
119	98	return $this;
120		}
121
122		/**
123		* {@inheritdoc}
124		*/
125	18	public function count()
126		{
127	18	if ($this->count === null) {
128		try {
129	18	$this->count = array_sum(array_map('current', $this->getCountQuery()->getScalarResult()));
130	2	} catch (NoResultException $e) {
131		$this->count = 0;
132		}
133		}
134
135	16	return $this->count;
136		}
137
138		/**
139		* {@inheritdoc}
140		*/
141	98	public function getIterator()
142		{
143	98	$offset = $this->query->getFirstResult();
144	98	$length = $this->query->getMaxResults();
145
146	98	if ($this->fetchJoinCollection) {
147	71	$subQuery = $this->cloneQuery($this->query);
148
149	71	if ($this->useOutputWalker($subQuery)) {
150	43	$subQuery->setHint(Query::HINT_CUSTOM_OUTPUT_WALKER, LimitSubqueryOutputWalker::class);
151		} else {
152	28	$this->appendTreeWalker($subQuery, LimitSubqueryWalker::class);
153	28	$this->unbindUnusedQueryParams($subQuery);
154		}
155
156	68	$subQuery->setFirstResult($offset)->setMaxResults($length);
157
158	68	$foundIdRows = $subQuery->getScalarResult();
159
160		// don't do this for an empty id array
161	68	if ($foundIdRows === []) {
162	2	return new \ArrayIterator([]);
163		}
164
165	67	$em = $subQuery->getEntityManager();
166	67	$connection = $em->getConnection();
167	67	$idType = $this->getIdentifiersQueryScalarResultType($subQuery, $em);
168	67	$whereInQuery = $this->cloneQuery($this->query);
169		$ids = array_map(static function (array $row) use ($idType, $connection) {
170	67	return $connection->convertToPHPValue(current($row), $idType);
171	67	}, $foundIdRows);
172
173	67	$this->appendTreeWalker($whereInQuery, WhereInWalker::class);
174	67	$whereInQuery->setHint(WhereInWalker::HINT_PAGINATOR_ID_COUNT, count($ids));
175	67	$whereInQuery->setFirstResult(null)->setMaxResults(null);
176	67	$whereInQuery->setParameter(WhereInWalker::PAGINATOR_ID_ALIAS, $ids);
177	67	$whereInQuery->setCacheable($this->query->isCacheable());
178	67	$whereInQuery->expireQueryCache();
179
180	67	$result = $whereInQuery->getResult($this->query->getHydrationMode());
181		} else {
182	27	$result = $this->cloneQuery($this->query)
183	27	->setMaxResults($length)
184	27	->setFirstResult($offset)
185	27	->setCacheable($this->query->isCacheable())
186	27	->getResult($this->query->getHydrationMode())
187		;
188		}
189
190	93	return new \ArrayIterator($result);
191		}
192
193		/**
194		* Clones a query.
195		*
196		* @param Query $query The query.
197		*
198		* @return Query The cloned query.
199		*/
200	111	private function cloneQuery(Query $query)
201		{
202		/* @var $cloneQuery Query */
203	111	$cloneQuery = clone $query;
204
205	111	$cloneQuery->setParameters(clone $query->getParameters());
206	111	$cloneQuery->setCacheable(false);
207
208	111	foreach ($query->getHints() as $name => $value) {
209	3	$cloneQuery->setHint($name, $value);
210		}
211
212	111	return $cloneQuery;
213		}
214
215		/**
216		* Determines whether to use an output walker for the query.
217		*
218		* @param Query $query The query.
219		*
220		* @return bool
221		*/
222	85	private function useOutputWalker(Query $query)
223		{
224	85	if ($this->useOutputWalkers === null) {
225	13	return (bool) $query->getHint(Query::HINT_CUSTOM_OUTPUT_WALKER) === false;
226		}
227
228	72	return $this->useOutputWalkers;
229		}
230
231		/**
232		* Appends a custom tree walker to the tree walkers hint.
233		*
234		* @param Query $query
235		* @param string $walkerClass
236		*/
237	78	private function appendTreeWalker(Query $query, $walkerClass)
238		{
239	78	$hints = $query->getHint(Query::HINT_CUSTOM_TREE_WALKERS);
240
241	78	if ($hints === false) {
242	77	$hints = [];
243		}
244
245	78	$hints[] = $walkerClass;
246	78	$query->setHint(Query::HINT_CUSTOM_TREE_WALKERS, $hints);
247	78	}
248
249		/**
250		* Returns Query prepared to count.
251		*
252		* @return Query
253		*/
254	18	private function getCountQuery()
255		{
256		/* @var $countQuery Query */
257	18	$countQuery = $this->cloneQuery($this->query);
258
259	18	if ( ! $countQuery->hasHint(CountWalker::HINT_DISTINCT)) {
260	18	$countQuery->setHint(CountWalker::HINT_DISTINCT, true);
261		}
262
263	18	if ($this->useOutputWalker($countQuery)) {
264	9	$platform = $countQuery->getEntityManager()->getConnection()->getDatabasePlatform(); // law of demeter win
265
266	9	$rsm = new ResultSetMapping();
267	9	$rsm->addScalarResult($platform->getSQLResultCasing('dctrn_count'), 'count');
268
269	9	$countQuery->setHint(Query::HINT_CUSTOM_OUTPUT_WALKER, CountOutputWalker::class);
270	9	$countQuery->setResultSetMapping($rsm);
271		} else {
272	10	$this->appendTreeWalker($countQuery, CountWalker::class);
273	10	$this->unbindUnusedQueryParams($countQuery);
274		}
275
276	16	$countQuery->setFirstResult(null)->setMaxResults(null);
277
278	16	return $countQuery;
279		}
280
281	35	private function unbindUnusedQueryParams(Query $query): void
282		{
283	35	$parser = new Parser($query);
284	35	$parameterMappings = $parser->parse()->getParameterMappings();
285		/* @var $parameters \Doctrine\Common\Collections\Collection\|\Doctrine\ORM\Query\Parameter[] */
286	30	$parameters = $query->getParameters();
287
288	30	foreach ($parameters as $key => $parameter) {
289	4	$parameterName = $parameter->getName();
290
291	4	if ( ! (isset($parameterMappings[$parameterName]) \|\| array_key_exists($parameterName, $parameterMappings))) {
292	4	unset($parameters[$key]);
293		}
294		}
295
296	30	$query->setParameters($parameters);
297	30	}
298
299		/**
300		* Parses a query that is supposed to fetch a set of entity identifier only,
301		* and retrieves the type of said identifier.
302		*
303		* @throws MappingException If metadata couldn't be loaded, or if there isn't a single
304		* identifier for the given query.
305		*/
306	67	private function getIdentifiersQueryScalarResultType(
307		Query $query,
308		EntityManagerInterface $em
309		) : ?string {
310	67	$rsm = (new Parser($query))
311	67	->parse()
312	67	->getResultSetMapping();
313
314	67	assert($rsm !== null);
315	67	assert($rsm->isSelect);
316
317	67	return $rsm->getTypeOfSelectionRootSingleIdentifierColumn($em);
318		}
319		}
320

doctrine / orm

Pull Request — 2.6 (#7903)

Paginator::count() A

Complexity

Size

Duplication

Code Coverage

Importance

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