Paginator::useOutputWalker() - Code Metrics - Inspection of "Bug: #7820 paginator ignores dbal type conversions..." - doctrine/orm - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — 2.6 (#7821)

by Marco

created 2019-09-17 12:15 UTC

Paginator::useOutputWalker() A

↳ Parent: Paginator

Complexity

Conditions	2
Paths	2

Size

Total Lines	7
Code Lines	3

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	4
CRAP Score	2

Importance

Changes

Metric	Value
cc	2
eloc	3
nc	2
nop	1
dl	0
loc	7
ccs	4
cts	4
cp	1
crap	2
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\Query\Parser;
use Doctrine\ORM\QueryBuilder;
use Doctrine\ORM\Query;
use Doctrine\ORM\Query\ResultSetMapping;
use Doctrine\ORM\NoResultException;
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([]);
            }

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

            $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 \Doctrine\ORM\Mapping\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\Query\Parser;
24		use Doctrine\ORM\QueryBuilder;
25		use Doctrine\ORM\Query;
26		use Doctrine\ORM\Query\ResultSetMapping;
27		use Doctrine\ORM\NoResultException;
28		use function assert;
29		use function current;
30
31		/**
32		* The paginator can handle various complex scenarios with DQL.
33		*
34		* @author Pablo Díez <[email protected]>
35		* @author Benjamin Eberlei <[email protected]>
36		* @license New BSD
37		*/
38		class Paginator implements \Countable, \IteratorAggregate
39		{
40		/**
41		* @var Query
42		*/
43		private $query;
44
45		/**
46		* @var bool
47		*/
48		private $fetchJoinCollection;
49
50		/**
51		* @var bool\|null
52		*/
53		private $useOutputWalkers;
54
55		/**
56		* @var int
57		*/
58		private $count;
59
60		/**
61		* Constructor.
62		*
63		* @param Query\|QueryBuilder $query A Doctrine ORM query or query builder.
64		* @param boolean $fetchJoinCollection Whether the query joins a collection (true by default).
65		*/
66	109	public function __construct($query, $fetchJoinCollection = true)
67		{
68	109	if ($query instanceof QueryBuilder) {
69	1	$query = $query->getQuery();
70		}
71
72	109	$this->query = $query;
73	109	$this->fetchJoinCollection = (bool) $fetchJoinCollection;
74	109	}
75
76		/**
77		* Returns the query.
78		*
79		* @return Query
80		*/
81		public function getQuery()
82		{
83		return $this->query;
84		}
85
86		/**
87		* Returns whether the query joins a collection.
88		*
89		* @return boolean Whether the query joins a collection.
90		*/
91		public function getFetchJoinCollection()
92		{
93		return $this->fetchJoinCollection;
94		}
95
96		/**
97		* Returns whether the paginator will use an output walker.
98		*
99		* @return bool\|null
100		*/
101		public function getUseOutputWalkers()
102		{
103		return $this->useOutputWalkers;
104		}
105
106		/**
107		* Sets whether the paginator will use an output walker.
108		*
109		* @param bool\|null $useOutputWalkers
110		*
111		* @return $this
112		*/
113	97	public function setUseOutputWalkers($useOutputWalkers)
114		{
115	97	$this->useOutputWalkers = $useOutputWalkers;
116
117	97	return $this;
118		}
119
120		/**
121		* {@inheritdoc}
122		*/
123	18	public function count()
124		{
125	18	if ($this->count === null) {
126		try {
127	18	$this->count = array_sum(array_map('current', $this->getCountQuery()->getScalarResult()));
128	2	} catch (NoResultException $e) {
129		$this->count = 0;
130		}
131		}
132
133	16	return $this->count;
134		}
135
136		/**
137		* {@inheritdoc}
138		*/
139	96	public function getIterator()
140		{
141	96	$offset = $this->query->getFirstResult();
142	96	$length = $this->query->getMaxResults();
143
144	96	if ($this->fetchJoinCollection) {
145	69	$subQuery = $this->cloneQuery($this->query);
146
147	69	if ($this->useOutputWalker($subQuery)) {
148	42	$subQuery->setHint(Query::HINT_CUSTOM_OUTPUT_WALKER, LimitSubqueryOutputWalker::class);
149		} else {
150	27	$this->appendTreeWalker($subQuery, LimitSubqueryWalker::class);
151	27	$this->unbindUnusedQueryParams($subQuery);
152		}
153
154	66	$subQuery->setFirstResult($offset)->setMaxResults($length);
155
156	66	$foundIdRows = $subQuery->getScalarResult();
157
158		// don't do this for an empty id array
159	66	if ($foundIdRows === []) {
160	2	return new \ArrayIterator([]);
161		}
162
163	65	$whereInQuery = $this->cloneQuery($this->query);
164	65	$em = $subQuery->getEntityManager();
165	65	$connection = $em->getConnection();
166	65	$idType = $this->getIdentifiersQueryScalarResultType($subQuery, $em);
167		$ids = array_map(static function (array $row) use ($connection, $idType) {
168	65	return $connection->convertToDatabaseValue(current($row), $idType);
169	65	}, $foundIdRows);
170
171	65	$this->appendTreeWalker($whereInQuery, WhereInWalker::class);
172	65	$whereInQuery->setHint(WhereInWalker::HINT_PAGINATOR_ID_COUNT, count($ids));
173	65	$whereInQuery->setFirstResult(null)->setMaxResults(null);
174	65	$whereInQuery->setParameter(WhereInWalker::PAGINATOR_ID_ALIAS, $ids);
175	65	$whereInQuery->setCacheable($this->query->isCacheable());
176
177	65	$result = $whereInQuery->getResult($this->query->getHydrationMode());
178		} else {
179	27	$result = $this->cloneQuery($this->query)
180	27	->setMaxResults($length)
181	27	->setFirstResult($offset)
182	27	->setCacheable($this->query->isCacheable())
183	27	->getResult($this->query->getHydrationMode())
184		;
185		}
186
187	91	return new \ArrayIterator($result);
188		}
189
190		/**
191		* Clones a query.
192		*
193		* @param Query $query The query.
194		*
195		* @return Query The cloned query.
196		*/
197	109	private function cloneQuery(Query $query)
198		{
199		/* @var $cloneQuery Query */
200	109	$cloneQuery = clone $query;
201
202	109	$cloneQuery->setParameters(clone $query->getParameters());
203	109	$cloneQuery->setCacheable(false);
204
205	109	foreach ($query->getHints() as $name => $value) {
206	3	$cloneQuery->setHint($name, $value);
207		}
208
209	109	return $cloneQuery;
210		}
211
212		/**
213		* Determines whether to use an output walker for the query.
214		*
215		* @param Query $query The query.
216		*
217		* @return bool
218		*/
219	83	private function useOutputWalker(Query $query)
220		{
221	83	if ($this->useOutputWalkers === null) {
222	12	return (bool) $query->getHint(Query::HINT_CUSTOM_OUTPUT_WALKER) === false;
223		}
224
225	71	return $this->useOutputWalkers;
226		}
227
228		/**
229		* Appends a custom tree walker to the tree walkers hint.
230		*
231		* @param Query $query
232		* @param string $walkerClass
233		*/
234	76	private function appendTreeWalker(Query $query, $walkerClass)
235		{
236	76	$hints = $query->getHint(Query::HINT_CUSTOM_TREE_WALKERS);
237
238	76	if ($hints === false) {
239	75	$hints = [];
240		}
241
242	76	$hints[] = $walkerClass;
243	76	$query->setHint(Query::HINT_CUSTOM_TREE_WALKERS, $hints);
244	76	}
245
246		/**
247		* Returns Query prepared to count.
248		*
249		* @return Query
250		*/
251	18	private function getCountQuery()
252		{
253		/* @var $countQuery Query */
254	18	$countQuery = $this->cloneQuery($this->query);
255
256	18	if ( ! $countQuery->hasHint(CountWalker::HINT_DISTINCT)) {
257	18	$countQuery->setHint(CountWalker::HINT_DISTINCT, true);
258		}
259
260	18	if ($this->useOutputWalker($countQuery)) {
261	9	$platform = $countQuery->getEntityManager()->getConnection()->getDatabasePlatform(); // law of demeter win
262
263	9	$rsm = new ResultSetMapping();
264	9	$rsm->addScalarResult($platform->getSQLResultCasing('dctrn_count'), 'count');
265
266	9	$countQuery->setHint(Query::HINT_CUSTOM_OUTPUT_WALKER, CountOutputWalker::class);
267	9	$countQuery->setResultSetMapping($rsm);
268		} else {
269	10	$this->appendTreeWalker($countQuery, CountWalker::class);
270	10	$this->unbindUnusedQueryParams($countQuery);
271		}
272
273	16	$countQuery->setFirstResult(null)->setMaxResults(null);
274
275	16	return $countQuery;
276		}
277
278	34	private function unbindUnusedQueryParams(Query $query): void
279		{
280	34	$parser = new Parser($query);
281	34	$parameterMappings = $parser->parse()->getParameterMappings();
282		/* @var $parameters \Doctrine\Common\Collections\Collection\|\Doctrine\ORM\Query\Parameter[] */
283	29	$parameters = $query->getParameters();
284
285	29	foreach ($parameters as $key => $parameter) {
286	4	$parameterName = $parameter->getName();
287
288	4	if ( ! (isset($parameterMappings[$parameterName]) \|\| array_key_exists($parameterName, $parameterMappings))) {
289	4	unset($parameters[$key]);
290		}
291		}
292
293	29	$query->setParameters($parameters);
294	29	}
295
296		/**
297		* Parses a query that is supposed to fetch a set of entity identifier only,
298		* and retrieves the type of said identifier.
299		*
300		* @throws \Doctrine\ORM\Mapping\MappingException if metadata couldn't be loaded, or if there isn't a single
301		* identifier for the given query
302		*/
303	65	private function getIdentifiersQueryScalarResultType(
304		Query $query,
305		EntityManagerInterface $em
306		) : ?string {
307	65	$rsm = (new Parser($query))
308	65	->parse()
309	65	->getResultSetMapping();
310
311	65	assert($rsm !== null);
312	65	assert($rsm->isSelect);
313
314	65	return $rsm->getTypeOfSelectionRootSingleIdentifierColumn($em);
315		}
316		}
317

doctrine / orm

Pull Request — 2.6 (#7821)

Paginator::useOutputWalker() A

Complexity

Size

Duplication

Code Coverage

Importance

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