MetadataProvider::resolveReverseProperty() - Code Metrics - Inspection of "Add hook/unhook for single relations via LaravelQu..." - Algo-Web/POData-Laravel - Measure and Improve Code Quality continuously with Scrutinizer

Test Failed

Pull Request — master (#100)

by Alex

created 2017-08-23 07:23 UTC

MetadataProvider::resolveReverseProperty() A

↳ Parent: MetadataProvider

Complexity

Conditions	2
Paths	2

Size

Total Lines	22
Code Lines	13

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	0
CRAP Score	6

Importance

Changes

Metric	Value
c	0
b	0
f	0
dl	0
loc	22
ccs	0
cts	0
cp	0
rs	9.2
cc	2
eloc	13
nc	2
nop	3
crap	6

<?php

namespace AlgoWeb\PODataLaravel\Providers;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\App;
use Illuminate\Support\ServiceProvider;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Str;
use POData\Providers\Metadata\IMetadataProvider;
use POData\Providers\Metadata\ResourceEntityType;
use POData\Providers\Metadata\ResourceSet;
use POData\Providers\Metadata\ResourceType;
use POData\Providers\Metadata\SimpleMetadataProvider;
use Illuminate\Support\Facades\Route;
use Illuminate\Support\Facades\Schema as Schema;
use POData\Providers\Metadata\Type\TypeCode;

class MetadataProvider extends MetadataBaseProvider
{
    protected $multConstraints = [ '0..1' => ['1'], '1' => ['0..1', '*'], '*' => ['1', '*']];
    protected static $metaNAMESPACE = 'Data';
    protected static $relationCache;
    const POLYMORPHIC = 'polyMorphicPlaceholder';
    const POLYMORPHIC_PLURAL = 'polyMorphicPlaceholders';

    /**
     * Bootstrap the application services.  Post-boot.
     *
     * @return void
     */
    public function boot()
    {
        self::$metaNAMESPACE = env('ODataMetaNamespace', 'Data');
        // If we aren't migrated, there's no DB tables to pull metadata _from_, so bail out early
        try {
            if (!Schema::hasTable(config('database.migrations'))) {
                return;
            }
        } catch (\Exception $e) {
            return;
        }

        $isCaching = true === $this->getIsCaching();
        $meta = Cache::get('metadata');
        $hasCache = null != $meta;

        if ($isCaching && $hasCache) {
            App::instance('metadata', $meta);
            return;
        }
        $meta = App::make('metadata');
        $this->reset();

        $stdRef = new \ReflectionClass(Model::class);
        $abstract = $meta->addEntityType($stdRef, static::POLYMORPHIC, true, null);
        $meta->addKeyProperty($abstract, 'PrimaryKey', TypeCode::STRING);

        $meta->addResourceSet(static::POLYMORPHIC, $abstract);

        $modelNames = $this->getCandidateModels();

        list($entityTypes) = $this->getEntityTypesAndResourceSets($meta, $modelNames);
        $entityTypes[static::POLYMORPHIC] = $abstract;

        // need to lift EntityTypes, adjust for polymorphic-affected relations, etc
        $biDirect = $this->getRepairedRoundTripRelations();

        // now that endpoints are hooked up, tackle the relationships
        // if we'd tried earlier, we'd be guaranteed to try to hook a relation up to null, which would be bad
        foreach ($biDirect as $line) {
            $this->processRelationLine($line, $entityTypes, $meta);
        }

        $key = 'metadata';
        $this->handlePostBoot($isCaching, $hasCache, $key, $meta);
    }

    /**
     * Register the application services.  Boot-time only.
     *
     * @return void
     */
    public function register()
    {
        $this->app->singleton('metadata', function ($app) {

            return new SimpleMetadataProvider('Data', self::$metaNAMESPACE);
        });
    }

    /**
     * @return array
     */
    protected function getCandidateModels()
    {
        $classes = $this->getClassMap();
        $ends = [];
        $startName = defined('PODATA_LARAVEL_APP_ROOT_NAMESPACE') ? PODATA_LARAVEL_APP_ROOT_NAMESPACE : 'App';
        foreach ($classes as $name) {
            if (\Illuminate\Support\Str::startsWith($name, $startName)) {
                if (in_array('AlgoWeb\\PODataLaravel\\Models\\MetadataTrait', class_uses($name))) {
                    $ends[] = $name;
                }
            }
        }
        return $ends;
    }

    /**
     * @param $meta
     * @param $ends
     * @return array[]
     */
    protected function getEntityTypesAndResourceSets($meta, $ends)
    {
        assert($meta instanceof IMetadataProvider, get_class($meta));
        $entityTypes = [];
        $resourceSets = [];
        $begins = [];
        $numEnds = count($ends);

        for ($i = 0; $i < $numEnds; $i++) {
            $bitter = $ends[$i];
            $fqModelName = $bitter;

            $instance = App::make($fqModelName);
            $name = strtolower($instance->getEndpointName());
            $metaSchema = $instance->getXmlSchema();

            // if for whatever reason we don't get an XML schema, move on to next entry and drop current one from
            // further processing
            if (null == $metaSchema) {
                continue;
            }
            $entityTypes[$fqModelName] = $metaSchema;
            $resourceSets[$fqModelName] = $meta->addResourceSet($name, $metaSchema);
            $begins[] = $bitter;
        }

        return [$entityTypes, $resourceSets, $begins];
    }

    public function calculateRoundTripRelations()
    {
        $modelNames = $this->getCandidateModels();

        $hooks = [];
        foreach ($modelNames as $name) {
            $model = new $name();
            $rels = $model->getRelationships();
            // it doesn't matter if a model has no relationships here, that lack will simply be skipped over
            // during hookup processing
            $hooks[$name] = $rels;
        }

        // model relation gubbins are assembled, now the hard bit starts
        // storing assembled bidirectional relationship schema
        $rawLines = [];
        // storing unprocessed relation gubbins for second-pass processing
        $remix = [];
        $this->calculateRoundTripRelationsFirstPass($hooks, $rawLines, $remix);

        // now for second processing pass, to pick up stuff that first didn't handle
        $rawLines = $this->calculateRoundTripRelationsSecondPass($remix, $rawLines);

        $numLines = count($rawLines);
        for ($i = 0; $i < $numLines; $i++) {
            $rawLines[$i]['principalRSet'] = $rawLines[$i]['principalType'];
            $rawLines[$i]['dependentRSet'] = $rawLines[$i]['dependentType'];
        }

        // deduplicate rawLines - can't use array_unique as array value elements are themselves arrays
        $lines = [];
        foreach ($rawLines as $line) {
            if (!in_array($line, $lines)) {
                $lines[] = $line;
            }
        }

        return $lines;
    }

    public function getPolymorphicRelationGroups()
    {
        $modelNames = $this->getCandidateModels();

        $knownSide = [];
        $unknownSide = [];

        $hooks = [];
        // fish out list of polymorphic-affected models for further processing
        foreach ($modelNames as $name) {
            $model = new $name();
            $isPoly = false;
            if ($model->isKnownPolymorphSide()) {
                $knownSide[$name] = [];
                $isPoly = true;
            }
            if ($model->isUnknownPolymorphSide()) {
                $unknownSide[$name] = [];
                $isPoly = true;
            }
            if (false === $isPoly) {
                continue;
            }

            $rels = $model->getRelationships();
            // it doesn't matter if a model has no relationships here, that lack will simply be skipped over
            // during hookup processing
            $hooks[$name] = $rels;
        }
        // ensure we've only loaded up polymorphic-affected models
        $knownKeys = array_keys($knownSide);
        $unknownKeys = array_keys($unknownSide);
        $dualKeys = array_intersect($knownKeys, $unknownKeys);
        assert(count($hooks) == (count($unknownKeys) + count($knownKeys) - count($dualKeys)));
        // if either list is empty, bail out - there's nothing to do
        if (0 === count($knownSide) || 0 === count($unknownSide)) {
            return [];
        }

        // commence primary ignition

        foreach ($unknownKeys as $key) {
            assert(isset($hooks[$key]));
            $hook = $hooks[$key];
            foreach ($hook as $barb) {
                foreach ($barb as $knownType => $propData) {
                    if (in_array($knownType, $knownKeys)) {
                        if (!isset($knownSide[$knownType][$key])) {
                            $knownSide[$knownType][$key] = [];
                        }
                        assert(isset($knownSide[$knownType][$key]));
                        $knownSide[$knownType][$key][] = $propData['property'];
                    }
                }
            }
        }

        return $knownSide;
    }

    /**
     * Get round-trip relations after inserting polymorphic-powered placeholders
     *
     * @return array
     */
    public function getRepairedRoundTripRelations()
    {
        if (!isset(self::$relationCache)) {
            $rels = $this->calculateRoundTripRelations();
            $groups = $this->getPolymorphicRelationGroups();

            if (0 === count($groups)) {
                self::$relationCache = $rels;
                return $rels;
            }

            $placeholder = static::POLYMORPHIC;

            $groupKeys = array_keys($groups);

            // we have at least one polymorphic relation, need to dig it out
            $numRels = count($rels);
            for ($i = 0; $i < $numRels; $i++) {
                $relation = $rels[$i];
                $principalType = $relation['principalType'];
                $dependentType = $relation['dependentType'];
                $principalPoly = in_array($principalType, $groupKeys);
                $dependentPoly = in_array($dependentType, $groupKeys);
                // if relation is not polymorphic, then move on
                if (!($principalPoly || $dependentPoly)) {
                    continue;
                } else {
                    // if only one end is a known end of a polymorphic relation
                    // for moment we're punting on both
                    $oneEnd = $principalPoly !== $dependentPoly;
                    assert($oneEnd, 'Multi-generational polymorphic relation chains not implemented');
                    $targRels = $principalPoly ? $groups[$principalType] : $groups[$dependentType];
                    $targUnknown = $targRels[$principalPoly ? $dependentType : $principalType];
                    $targProperty = $principalPoly ? $relation['dependentProp'] : $relation['principalProp'];
                    $msg = 'Specified unknown-side property ' . $targProperty
                           . ' not found in polymorphic relation map';
                    assert(in_array($targProperty, $targUnknown), $msg);

                    $targType = $principalPoly ? 'dependentRSet' : 'principalRSet';
                    $rels[$i][$targType] = $placeholder;
                    continue;
                }
            }
            self::$relationCache = $rels;
        }
        return self::$relationCache;
    }

    /**
     * @param $remix
     * @param $lines
     * @return array
     */
    private function calculateRoundTripRelationsSecondPass($remix, $lines)
    {
        foreach ($remix as $principalType => $value) {
            foreach ($value as $fk => $localRels) {
                foreach ($localRels as $dependentType => $deets) {
                    $principalMult = $deets['multiplicity'];
                    $principalProperty = $deets['property'];
                    $principalKey = $deets['local'];

                    if (!isset($remix[$dependentType])) {
                        continue;
                    }
                    $foreign = $remix[$dependentType];
                    if (!isset($foreign[$principalKey])) {
                        continue;
                    }
                    $foreign = $foreign[$principalKey];
                    $dependentMult = $foreign[$dependentType]['multiplicity'];
                    $dependentProperty = $foreign[$dependentType]['property'];
                    assert(
                        in_array($dependentMult, $this->multConstraints[$principalMult]),
                        'Cannot pair multiplicities ' . $dependentMult . ' and ' . $principalMult
                    );
                    assert(
                        in_array($principalMult, $this->multConstraints[$dependentMult]),
                        'Cannot pair multiplicities ' . $principalMult . ' and ' . $dependentMult
                    );
                    // generate forward and reverse relations
                    list($forward, $reverse) = $this->calculateRoundTripRelationsGenForwardReverse(
                        $principalType,
                        $principalMult,
                        $principalProperty,
                        $dependentType,
                        $dependentMult,
                        $dependentProperty
                    );
                    // add forward relation
                    $lines[] = $forward;
                    // add reverse relation
                    $lines[] = $reverse;
                }
            }
        }
        return $lines;
    }

    /**
     * @param $hooks
     * @param $lines
     * @param $remix
     */
    private function calculateRoundTripRelationsFirstPass($hooks, &$lines, &$remix)
    {
        foreach ($hooks as $principalType => $value) {
            foreach ($value as $fk => $localRels) {
                foreach ($localRels as $dependentType => $deets) {
                    if (!isset($hooks[$dependentType])) {
                        continue;
                    }
                    $principalMult = $deets['multiplicity'];
                    $principalProperty = $deets['property'];
                    $principalKey = $deets['local'];

                    $foreign = $hooks[$dependentType];
                    $foreign = null != $foreign && isset($foreign[$principalKey]) ? $foreign[$principalKey] : null;

                    if (null != $foreign && isset($foreign[$principalType])) {
                        $foreign = $foreign[$principalType];
                        $dependentMult = $foreign['multiplicity'];
                        $dependentProperty = $foreign['property'];
                        assert(
                            in_array($dependentMult, $this->multConstraints[$principalMult]),
                            'Cannot pair multiplicities ' . $dependentMult . ' and ' . $principalMult
                        );
                        assert(
                            in_array($principalMult, $this->multConstraints[$dependentMult]),
                            'Cannot pair multiplicities ' . $principalMult . ' and ' . $dependentMult
                        );
                        // generate forward and reverse relations
                        list($forward, $reverse) = $this->calculateRoundTripRelationsGenForwardReverse(
                            $principalType,
                            $principalMult,
                            $principalProperty,
                            $dependentType,
                            $dependentMult,
                            $dependentProperty
                        );
                        // add forward relation
                        $lines[] = $forward;
                        // add reverse relation
                        $lines[] = $reverse;
                    } else {
                        if (!isset($remix[$principalType])) {
                            $remix[$principalType] = [];
                        }
                        if (!isset($remix[$principalType][$fk])) {
                            $remix[$principalType][$fk] = [];
                        }
                        if (!isset($remix[$principalType][$fk][$dependentType])) {
                            $remix[$principalType][$fk][$dependentType] = $deets;
                        }
                        assert(isset($remix[$principalType][$fk][$dependentType]));
                    }
                }
            }
        }
    }

    /**
     * @param $principalType
     * @param $principalMult
     * @param $principalProperty
     * @param $dependentType
     * @param $dependentMult
     * @param $dependentProperty
     * @return array[]
     */
    private function calculateRoundTripRelationsGenForwardReverse(
        $principalType,
        $principalMult,
        $principalProperty,
        $dependentType,
        $dependentMult,
        $dependentProperty
    ) {
        $forward = [
            'principalType' => $principalType,
            'principalMult' => $dependentMult,
            'principalProp' => $principalProperty,
            'dependentType' => $dependentType,
            'dependentMult' => $principalMult,
            'dependentProp' => $dependentProperty
        ];
        $reverse = [
            'principalType' => $dependentType,
            'principalMult' => $principalMult,
            'principalProp' => $dependentProperty,
            'dependentType' => $principalType,
            'dependentMult' => $dependentMult,
            'dependentProp' => $principalProperty
        ];
        return [$forward, $reverse];
    }

    private function processRelationLine($line, $entityTypes, &$meta)
    {
        $principalType = $line['principalType'];
        $principalMult = $line['principalMult'];
        $principalProp = $line['principalProp'];
        $principalRSet = $line['principalRSet'];
        $dependentType = $line['dependentType'];
        $dependentMult = $line['dependentMult'];
        $dependentProp = $line['dependentProp'];
        $dependentRSet = $line['dependentRSet'];

        if (!isset($entityTypes[$principalType]) || !isset($entityTypes[$dependentType])) {
            return;
        }
        $principal = $entityTypes[$principalType];
        $dependent = $entityTypes[$dependentType];
        $isPoly = static::POLYMORPHIC == $principalRSet || static::POLYMORPHIC == $dependentRSet;

        if ($isPoly) {
            $this->attachReferencePolymorphic(
                $meta,
                $principalMult,
                $dependentMult,
                $principal,
                $dependent,
                $principalProp,
                $dependentProp,
                $principalRSet,
                $dependentRSet
            );
            return null;
        }
        $this->attachReferenceNonPolymorphic(
            $meta,
            $principalMult,
            $dependentMult,
            $principal,
            $dependent,
            $principalProp,
            $dependentProp
        );
        return null;
    }

    /**
     * @param $meta
     * @param $principalMult
     * @param $dependentMult
     * @param $principal
     * @param $dependent
     * @param $principalProp
     * @param $dependentProp
     */
    private function attachReferenceNonPolymorphic(
        &$meta,
        $principalMult,
        $dependentMult,
        $principal,
        $dependent,
        $principalProp,
        $dependentProp
    ) {
        //many-to-many
        if ('*' == $principalMult && '*' == $dependentMult) {
            $meta->addResourceSetReferencePropertyBidirectional(
                $principal,
                $dependent,
                $principalProp,
                $dependentProp
            );
            return;
        }
        //one-to-one
        if ('0..1' == $principalMult || '0..1' == $dependentMult) {
            assert($principalMult != $dependentMult, 'Cannot have both ends with 0..1 multiplicity');
            $meta->addResourceReferenceSinglePropertyBidirectional(
                $principal,
                $dependent,
                $principalProp,
                $dependentProp
            );
            return;
        }
        assert($principalMult != $dependentMult, 'Cannot have both ends same multiplicity for 1:N relation');
        //principal-one-to-dependent-many
        if ('*' == $principalMult) {
            $meta->addResourceReferencePropertyBidirectional(
                $principal,
                $dependent,
                $principalProp,
                $dependentProp
            );
            return;
        }
        //dependent-one-to-principal-many
        $meta->addResourceReferencePropertyBidirectional(
            $dependent,
            $principal,
            $dependentProp,
            $principalProp
        );
        return;
    }

    /**
     * @param $meta
     * @param $principalMult
     * @param $dependentMult
     * @param $principal
     * @param $dependent
     * @param $principalProp
     * @param $dependentProp
     */
    private function attachReferencePolymorphic(
        &$meta,
        $principalMult,
        $dependentMult,
        $principal,
        $dependent,
        $principalProp,
        $dependentProp,
        $principalRSet,
        $dependentRSet
    ) {
        $prinPoly = static::POLYMORPHIC == $principalRSet;
        $depPoly = static::POLYMORPHIC == $dependentRSet;
        $principalSet = (!$prinPoly) ? $principal->getCustomState()
            : $meta->resolveResourceSet(static::POLYMORPHIC_PLURAL);
        $dependentSet = (!$depPoly) ? $dependent->getCustomState()
            : $meta->resolveResourceSet(static::POLYMORPHIC_PLURAL);
        assert($principalSet instanceof ResourceSet, $principalRSet);
        assert($dependentSet instanceof ResourceSet, $dependentRSet);

        $isPrincipalAdded = null !== $principal->resolveProperty($principalProp);
        $isDependentAdded = null !== $dependent->resolveProperty($dependentProp);
        $prinMany = '*' == $principalMult;
        $depMany = '*' == $dependentMult;

        if (!$isPrincipalAdded) {
            if ('*' == $principalMult || $depMany) {
                $meta->addResourceSetReferenceProperty($principal, $principalProp, $dependentSet);
            } else {
                $meta->addResourceReferenceProperty($principal, $principalProp, $dependentSet, $prinPoly, $depMany);
            }
        }
        if (!$isDependentAdded) {
            if ('*' == $dependentMult || $prinMany) {
                $meta->addResourceSetReferenceProperty($dependent, $dependentProp, $principalSet);
            } else {
                $meta->addResourceReferenceProperty($dependent, $dependentProp, $principalSet, $depPoly, $prinMany);
            }
        }
        return;
    }

    public function reset()
    {
        self::$relationCache = null;
    }

    /**
     * Resolve possible reverse relation property names
     *
     * @param Model $source
     * @param Model $target
     * @param $propName
     * @return string|null
     */
    public function resolveReverseProperty(Model $source, Model $target, $propName)
    {
        assert(is_string($propName), 'Property name must be string');
        $relations = $this->getRepairedRoundTripRelations();

        $sourceName = get_class($source);
        $targName = get_class($target);

        $filter = function ($segment) use ($sourceName, $targName, $propName) {
            $match = $sourceName == $segment['principalType'];
            $match &= $targName == $segment['dependentType'];
            $match &= $propName == $segment['principalProp'];

            return $match;
        };

        // array_filter does not reset keys - we have to do it ourselves
        $trim = array_values(array_filter($relations, $filter));
        $result = 0 === count($trim) ? null : $trim[0]['dependentProp'];

        return $result;
    }
}


1		<?php
2
3		namespace AlgoWeb\PODataLaravel\Providers;
4
5		use Illuminate\Database\Eloquent\Model;
6		use Illuminate\Support\Facades\App;
7		use Illuminate\Support\ServiceProvider;
8		use Illuminate\Support\Facades\Cache;
9		use Illuminate\Support\Str;
10		use POData\Providers\Metadata\IMetadataProvider;
11		use POData\Providers\Metadata\ResourceEntityType;
12		use POData\Providers\Metadata\ResourceSet;
13		use POData\Providers\Metadata\ResourceType;
14		use POData\Providers\Metadata\SimpleMetadataProvider;
15		use Illuminate\Support\Facades\Route;
16		use Illuminate\Support\Facades\Schema as Schema;
17		use POData\Providers\Metadata\Type\TypeCode;
18
19		class MetadataProvider extends MetadataBaseProvider
20	1	{
21		protected $multConstraints = [ '0..1' => ['1'], '1' => ['0..1', ''], '' => ['1', '*']];
22	1	protected static $metaNAMESPACE = 'Data';
23		protected static $relationCache;
24		const POLYMORPHIC = 'polyMorphicPlaceholder';
25	1	const POLYMORPHIC_PLURAL = 'polyMorphicPlaceholders';
26
27		/**
28	1	* Bootstrap the application services. Post-boot.
29	1	*
30		* @return void
31		*/
32		public function boot()
33		{
34		self::$metaNAMESPACE = env('ODataMetaNamespace', 'Data');
35		// If we aren't migrated, there's no DB tables to pull metadata _from_, so bail out early
36		try {
37		if (!Schema::hasTable(config('database.migrations'))) {
38		return;
39		}
40		} catch (\Exception $e) {
41		return;
42		}
43
44		$isCaching = true === $this->getIsCaching();
45		$meta = Cache::get('metadata');
46		$hasCache = null != $meta;
47
48		if ($isCaching && $hasCache) {
49		App::instance('metadata', $meta);
50		return;
51		}
52		$meta = App::make('metadata');
53		$this->reset();
54
55		$stdRef = new \ReflectionClass(Model::class);
56		$abstract = $meta->addEntityType($stdRef, static::POLYMORPHIC, true, null);
57		$meta->addKeyProperty($abstract, 'PrimaryKey', TypeCode::STRING);
58
59		$meta->addResourceSet(static::POLYMORPHIC, $abstract);
60
61		$modelNames = $this->getCandidateModels();
62
63		list($entityTypes) = $this->getEntityTypesAndResourceSets($meta, $modelNames);
64		$entityTypes[static::POLYMORPHIC] = $abstract;
65
66		// need to lift EntityTypes, adjust for polymorphic-affected relations, etc
67		$biDirect = $this->getRepairedRoundTripRelations();
68
69		// now that endpoints are hooked up, tackle the relationships
70		// if we'd tried earlier, we'd be guaranteed to try to hook a relation up to null, which would be bad
71		foreach ($biDirect as $line) {
72		$this->processRelationLine($line, $entityTypes, $meta);
73		}
74
75		$key = 'metadata';
76		$this->handlePostBoot($isCaching, $hasCache, $key, $meta);
77		}
78
79		/**
80		* Register the application services. Boot-time only.
81		*
82		* @return void
83		*/
84		public function register()
85		{
86		$this->app->singleton('metadata', function ($app) {
		0 ignored issues – show Unused Code introduced 2016-11-01 11:02 UTC by Report Bug Copy Issue Report The parameter `$app` is not used and could be removed. This check looks from parameters that have been defined for a function or method, but which are not used in the method body. Loading history...
87		return new SimpleMetadataProvider('Data', self::$metaNAMESPACE);
88		});
89		}
90
91		/**
92		* @return array
93		*/
94		protected function getCandidateModels()
95		{
96		$classes = $this->getClassMap();
97		$ends = [];
98		$startName = defined('PODATA_LARAVEL_APP_ROOT_NAMESPACE') ? PODATA_LARAVEL_APP_ROOT_NAMESPACE : 'App';
99		foreach ($classes as $name) {
100		if (\Illuminate\Support\Str::startsWith($name, $startName)) {
101		if (in_array('AlgoWeb\\PODataLaravel\\Models\\MetadataTrait', class_uses($name))) {
102		$ends[] = $name;
103		}
104		}
105		}
106		return $ends;
107		}
108
109		/**
110		* @param $meta
111		* @param $ends
112		* @return array[]
113		*/
114		protected function getEntityTypesAndResourceSets($meta, $ends)
115		{
116		assert($meta instanceof IMetadataProvider, get_class($meta));
117		$entityTypes = [];
118		$resourceSets = [];
119		$begins = [];
120		$numEnds = count($ends);
121
122		for ($i = 0; $i < $numEnds; $i++) {
123		$bitter = $ends[$i];
124		$fqModelName = $bitter;
125
126		$instance = App::make($fqModelName);
127		$name = strtolower($instance->getEndpointName());
128		$metaSchema = $instance->getXmlSchema();
129
130		// if for whatever reason we don't get an XML schema, move on to next entry and drop current one from
131		// further processing
132		if (null == $metaSchema) {
133		continue;
134		}
135		$entityTypes[$fqModelName] = $metaSchema;
136		$resourceSets[$fqModelName] = $meta->addResourceSet($name, $metaSchema);
137		$begins[] = $bitter;
138		}
139
140		return [$entityTypes, $resourceSets, $begins];
141		}
142
143		public function calculateRoundTripRelations()
144		{
145		$modelNames = $this->getCandidateModels();
146
147		$hooks = [];
148		foreach ($modelNames as $name) {
149		$model = new $name();
150		$rels = $model->getRelationships();
151		// it doesn't matter if a model has no relationships here, that lack will simply be skipped over
152		// during hookup processing
153		$hooks[$name] = $rels;
154		}
155
156		// model relation gubbins are assembled, now the hard bit starts
157		// storing assembled bidirectional relationship schema
158		$rawLines = [];
159		// storing unprocessed relation gubbins for second-pass processing
160		$remix = [];
161		$this->calculateRoundTripRelationsFirstPass($hooks, $rawLines, $remix);
162
163		// now for second processing pass, to pick up stuff that first didn't handle
164		$rawLines = $this->calculateRoundTripRelationsSecondPass($remix, $rawLines);
165
166		$numLines = count($rawLines);
167		for ($i = 0; $i < $numLines; $i++) {
168		$rawLines[$i]['principalRSet'] = $rawLines[$i]['principalType'];
169		$rawLines[$i]['dependentRSet'] = $rawLines[$i]['dependentType'];
170		}
171
172		// deduplicate rawLines - can't use array_unique as array value elements are themselves arrays
173		$lines = [];
174		foreach ($rawLines as $line) {
175		if (!in_array($line, $lines)) {
176		$lines[] = $line;
177		}
178		}
179
180		return $lines;
181		}
182
183		public function getPolymorphicRelationGroups()
184		{
185		$modelNames = $this->getCandidateModels();
186
187		$knownSide = [];
188		$unknownSide = [];
189
190		$hooks = [];
191		// fish out list of polymorphic-affected models for further processing
192		foreach ($modelNames as $name) {
193		$model = new $name();
194		$isPoly = false;
195		if ($model->isKnownPolymorphSide()) {
196		$knownSide[$name] = [];
197		$isPoly = true;
198		}
199		if ($model->isUnknownPolymorphSide()) {
200		$unknownSide[$name] = [];
201		$isPoly = true;
202		}
203		if (false === $isPoly) {
204		continue;
205		}
206
207		$rels = $model->getRelationships();
208		// it doesn't matter if a model has no relationships here, that lack will simply be skipped over
209		// during hookup processing
210		$hooks[$name] = $rels;
211		}
212		// ensure we've only loaded up polymorphic-affected models
213		$knownKeys = array_keys($knownSide);
214		$unknownKeys = array_keys($unknownSide);
215		$dualKeys = array_intersect($knownKeys, $unknownKeys);
216		assert(count($hooks) == (count($unknownKeys) + count($knownKeys) - count($dualKeys)));
217		// if either list is empty, bail out - there's nothing to do
218		if (0 === count($knownSide) \|\| 0 === count($unknownSide)) {
219		return [];
220		}
221
222		// commence primary ignition
223
224		foreach ($unknownKeys as $key) {
225		assert(isset($hooks[$key]));
226		$hook = $hooks[$key];
227		foreach ($hook as $barb) {
228		foreach ($barb as $knownType => $propData) {
229		if (in_array($knownType, $knownKeys)) {
230		if (!isset($knownSide[$knownType][$key])) {
231		$knownSide[$knownType][$key] = [];
232		}
233		assert(isset($knownSide[$knownType][$key]));
234		$knownSide[$knownType][$key][] = $propData['property'];
235		}
236		}
237		}
238		}
239
240		return $knownSide;
241		}
242
243		/**
244		* Get round-trip relations after inserting polymorphic-powered placeholders
245		*
246		* @return array
247		*/
248		public function getRepairedRoundTripRelations()
249		{
250		if (!isset(self::$relationCache)) {
251		$rels = $this->calculateRoundTripRelations();
252		$groups = $this->getPolymorphicRelationGroups();
253
254		if (0 === count($groups)) {
255		self::$relationCache = $rels;
256		return $rels;
257		}
258
259		$placeholder = static::POLYMORPHIC;
260
261		$groupKeys = array_keys($groups);
262
263		// we have at least one polymorphic relation, need to dig it out
264		$numRels = count($rels);
265		for ($i = 0; $i < $numRels; $i++) {
266		$relation = $rels[$i];
267		$principalType = $relation['principalType'];
268		$dependentType = $relation['dependentType'];
269		$principalPoly = in_array($principalType, $groupKeys);
270		$dependentPoly = in_array($dependentType, $groupKeys);
271		// if relation is not polymorphic, then move on
272		if (!($principalPoly \|\| $dependentPoly)) {
273		continue;
274		} else {
275		// if only one end is a known end of a polymorphic relation
276		// for moment we're punting on both
277		$oneEnd = $principalPoly !== $dependentPoly;
278		assert($oneEnd, 'Multi-generational polymorphic relation chains not implemented');
279		$targRels = $principalPoly ? $groups[$principalType] : $groups[$dependentType];
280		$targUnknown = $targRels[$principalPoly ? $dependentType : $principalType];
281		$targProperty = $principalPoly ? $relation['dependentProp'] : $relation['principalProp'];
282		$msg = 'Specified unknown-side property ' . $targProperty
283		. ' not found in polymorphic relation map';
284		assert(in_array($targProperty, $targUnknown), $msg);
285
286		$targType = $principalPoly ? 'dependentRSet' : 'principalRSet';
287		$rels[$i][$targType] = $placeholder;
288		continue;
289		}
290		}
291		self::$relationCache = $rels;
292		}
293		return self::$relationCache;
294		}
295
296		/**
297		* @param $remix
298		* @param $lines
299		* @return array
300		*/
301		private function calculateRoundTripRelationsSecondPass($remix, $lines)
302		{
303		foreach ($remix as $principalType => $value) {
304		foreach ($value as $fk => $localRels) {
305		foreach ($localRels as $dependentType => $deets) {
306		$principalMult = $deets['multiplicity'];
307		$principalProperty = $deets['property'];
308		$principalKey = $deets['local'];
309
310		if (!isset($remix[$dependentType])) {
311		continue;
312		}
313		$foreign = $remix[$dependentType];
314		if (!isset($foreign[$principalKey])) {
315		continue;
316		}
317		$foreign = $foreign[$principalKey];
318		$dependentMult = $foreign[$dependentType]['multiplicity'];
319		$dependentProperty = $foreign[$dependentType]['property'];
320		assert(
321		in_array($dependentMult, $this->multConstraints[$principalMult]),
322		'Cannot pair multiplicities ' . $dependentMult . ' and ' . $principalMult
323		);
324		assert(
325		in_array($principalMult, $this->multConstraints[$dependentMult]),
326		'Cannot pair multiplicities ' . $principalMult . ' and ' . $dependentMult
327		);
328		// generate forward and reverse relations
329		list($forward, $reverse) = $this->calculateRoundTripRelationsGenForwardReverse(
330		$principalType,
331		$principalMult,
332		$principalProperty,
333		$dependentType,
334		$dependentMult,
335		$dependentProperty
336		);
337		// add forward relation
338		$lines[] = $forward;
339		// add reverse relation
340		$lines[] = $reverse;
341		}
342		}
343		}
344		return $lines;
345		}
346
347		/**
348		* @param $hooks
349		* @param $lines
350		* @param $remix
351		*/
352		private function calculateRoundTripRelationsFirstPass($hooks, &$lines, &$remix)
353		{
354		foreach ($hooks as $principalType => $value) {
355		foreach ($value as $fk => $localRels) {
356		foreach ($localRels as $dependentType => $deets) {
357		if (!isset($hooks[$dependentType])) {
358		continue;
359		}
360		$principalMult = $deets['multiplicity'];
361		$principalProperty = $deets['property'];
362		$principalKey = $deets['local'];
363
364		$foreign = $hooks[$dependentType];
365		$foreign = null != $foreign && isset($foreign[$principalKey]) ? $foreign[$principalKey] : null;
366
367		if (null != $foreign && isset($foreign[$principalType])) {
368		$foreign = $foreign[$principalType];
369		$dependentMult = $foreign['multiplicity'];
370		$dependentProperty = $foreign['property'];
371		assert(
372		in_array($dependentMult, $this->multConstraints[$principalMult]),
373		'Cannot pair multiplicities ' . $dependentMult . ' and ' . $principalMult
374		);
375		assert(
376		in_array($principalMult, $this->multConstraints[$dependentMult]),
377		'Cannot pair multiplicities ' . $principalMult . ' and ' . $dependentMult
378		);
379		// generate forward and reverse relations
380		list($forward, $reverse) = $this->calculateRoundTripRelationsGenForwardReverse(
381		$principalType,
382		$principalMult,
383		$principalProperty,
384		$dependentType,
385		$dependentMult,
386		$dependentProperty
387		);
388		// add forward relation
389		$lines[] = $forward;
390		// add reverse relation
391		$lines[] = $reverse;
392		} else {
393		if (!isset($remix[$principalType])) {
394		$remix[$principalType] = [];
395		}
396		if (!isset($remix[$principalType][$fk])) {
397		$remix[$principalType][$fk] = [];
398		}
399		if (!isset($remix[$principalType][$fk][$dependentType])) {
400		$remix[$principalType][$fk][$dependentType] = $deets;
401		}
402		assert(isset($remix[$principalType][$fk][$dependentType]));
403		}
404		}
405		}
406		}
407		}
408
409		/**
410		* @param $principalType
411		* @param $principalMult
412		* @param $principalProperty
413		* @param $dependentType
414		* @param $dependentMult
415		* @param $dependentProperty
416		* @return array[]
417		*/
418		private function calculateRoundTripRelationsGenForwardReverse(
419		$principalType,
420		$principalMult,
421		$principalProperty,
422		$dependentType,
423		$dependentMult,
424		$dependentProperty
425		) {
426		$forward = [
427		'principalType' => $principalType,
428		'principalMult' => $dependentMult,
429		'principalProp' => $principalProperty,
430		'dependentType' => $dependentType,
431		'dependentMult' => $principalMult,
432		'dependentProp' => $dependentProperty
433		];
434		$reverse = [
435		'principalType' => $dependentType,
436		'principalMult' => $principalMult,
437		'principalProp' => $dependentProperty,
438		'dependentType' => $principalType,
439		'dependentMult' => $dependentMult,
440		'dependentProp' => $principalProperty
441		];
442		return [$forward, $reverse];
443		}
444
445		private function processRelationLine($line, $entityTypes, &$meta)
446		{
447		$principalType = $line['principalType'];
448		$principalMult = $line['principalMult'];
449		$principalProp = $line['principalProp'];
450		$principalRSet = $line['principalRSet'];
451		$dependentType = $line['dependentType'];
452		$dependentMult = $line['dependentMult'];
453		$dependentProp = $line['dependentProp'];
454		$dependentRSet = $line['dependentRSet'];
455
456		if (!isset($entityTypes[$principalType]) \|\| !isset($entityTypes[$dependentType])) {
457		return;
458		}
459		$principal = $entityTypes[$principalType];
460		$dependent = $entityTypes[$dependentType];
461		$isPoly = static::POLYMORPHIC == $principalRSet \|\| static::POLYMORPHIC == $dependentRSet;
462
463		if ($isPoly) {
464		$this->attachReferencePolymorphic(
465		$meta,
466		$principalMult,
467		$dependentMult,
468		$principal,
469		$dependent,
470		$principalProp,
471		$dependentProp,
472		$principalRSet,
473		$dependentRSet
474		);
475		return null;
476		}
477		$this->attachReferenceNonPolymorphic(
478		$meta,
479		$principalMult,
480		$dependentMult,
481		$principal,
482		$dependent,
483		$principalProp,
484		$dependentProp
485		);
486		return null;
487		}
488
489		/**
490		* @param $meta
491		* @param $principalMult
492		* @param $dependentMult
493		* @param $principal
494		* @param $dependent
495		* @param $principalProp
496		* @param $dependentProp
497		*/
498		private function attachReferenceNonPolymorphic(
499		&$meta,
500		$principalMult,
501		$dependentMult,
502		$principal,
503		$dependent,
504		$principalProp,
505		$dependentProp
506		) {
507		//many-to-many
508		if ('' == $principalMult && '' == $dependentMult) {
509		$meta->addResourceSetReferencePropertyBidirectional(
510		$principal,
511		$dependent,
512		$principalProp,
513		$dependentProp
514		);
515		return;
516		}
517		//one-to-one
518		if ('0..1' == $principalMult \|\| '0..1' == $dependentMult) {
519		assert($principalMult != $dependentMult, 'Cannot have both ends with 0..1 multiplicity');
520		$meta->addResourceReferenceSinglePropertyBidirectional(
521		$principal,
522		$dependent,
523		$principalProp,
524		$dependentProp
525		);
526		return;
527		}
528		assert($principalMult != $dependentMult, 'Cannot have both ends same multiplicity for 1:N relation');
529		//principal-one-to-dependent-many
530		if ('*' == $principalMult) {
531		$meta->addResourceReferencePropertyBidirectional(
532		$principal,
533		$dependent,
534		$principalProp,
535		$dependentProp
536		);
537		return;
538		}
539		//dependent-one-to-principal-many
540		$meta->addResourceReferencePropertyBidirectional(
541		$dependent,
542		$principal,
543		$dependentProp,
544		$principalProp
545		);
546		return;
547		}
548
549		/**
550		* @param $meta
551		* @param $principalMult
552		* @param $dependentMult
553		* @param $principal
554		* @param $dependent
555		* @param $principalProp
556		* @param $dependentProp
557		*/
558		private function attachReferencePolymorphic(
559		&$meta,
560		$principalMult,
561		$dependentMult,
562		$principal,
563		$dependent,
564		$principalProp,
565		$dependentProp,
566		$principalRSet,
567		$dependentRSet
568		) {
569		$prinPoly = static::POLYMORPHIC == $principalRSet;
570		$depPoly = static::POLYMORPHIC == $dependentRSet;
571		$principalSet = (!$prinPoly) ? $principal->getCustomState()
572		: $meta->resolveResourceSet(static::POLYMORPHIC_PLURAL);
573		$dependentSet = (!$depPoly) ? $dependent->getCustomState()
574		: $meta->resolveResourceSet(static::POLYMORPHIC_PLURAL);
575		assert($principalSet instanceof ResourceSet, $principalRSet);
576		assert($dependentSet instanceof ResourceSet, $dependentRSet);
577
578		$isPrincipalAdded = null !== $principal->resolveProperty($principalProp);
579		$isDependentAdded = null !== $dependent->resolveProperty($dependentProp);
580		$prinMany = '*' == $principalMult;
581		$depMany = '*' == $dependentMult;
582
583		if (!$isPrincipalAdded) {
584		if ('*' == $principalMult \|\| $depMany) {
585		$meta->addResourceSetReferenceProperty($principal, $principalProp, $dependentSet);
586		} else {
587		$meta->addResourceReferenceProperty($principal, $principalProp, $dependentSet, $prinPoly, $depMany);
588		}
589		}
590		if (!$isDependentAdded) {
591		if ('*' == $dependentMult \|\| $prinMany) {
592		$meta->addResourceSetReferenceProperty($dependent, $dependentProp, $principalSet);
593		} else {
594		$meta->addResourceReferenceProperty($dependent, $dependentProp, $principalSet, $depPoly, $prinMany);
595		}
596		}
597		return;
598		}
599
600		public function reset()
601		{
602		self::$relationCache = null;
603		}
604
605		/**
606		* Resolve possible reverse relation property names
607		*
608		* @param Model $source
609		* @param Model $target
610		* @param $propName
611		* @return string\|null
612		*/
613		public function resolveReverseProperty(Model $source, Model $target, $propName)
614		{
615		assert(is_string($propName), 'Property name must be string');
616		$relations = $this->getRepairedRoundTripRelations();
617
618		$sourceName = get_class($source);
619		$targName = get_class($target);
620
621		$filter = function ($segment) use ($sourceName, $targName, $propName) {
622		$match = $sourceName == $segment['principalType'];
623		$match &= $targName == $segment['dependentType'];
624		$match &= $propName == $segment['principalProp'];
625
626		return $match;
627		};
628
629		// array_filter does not reset keys - we have to do it ourselves
630		$trim = array_values(array_filter($relations, $filter));
631		$result = 0 === count($trim) ? null : $trim[0]['dependentProp'];
632
633		return $result;
634		}
635		}
636

Algo-Web / POData-Laravel

Pull Request — master (#100)

MetadataProvider::resolveReverseProperty() A

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