Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like SimpleMetadataProvider often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use SimpleMetadataProvider, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 18 | class SimpleMetadataProvider implements IMetadataProvider  | 
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| 19 | { | 
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| 20 | public $OdataEntityMap = [];  | 
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| 21 | protected $resourceSets = [];  | 
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| 22 | protected $resourceTypes = [];  | 
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| 23 | protected $associationSets = [];  | 
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| 24 | protected $containerName;  | 
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| 25 | protected $namespaceName;  | 
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| 26 | private $metadataManager;  | 
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| 27 | private $typeSetMapping = [];  | 
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| 28 | protected $singletons = [];  | 
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| 29 | |||
| 30 | /**  | 
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| 31 | * @param string $containerName container name for the datasource  | 
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| 32 | * @param string $namespaceName namespace for the datasource  | 
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| 33 | */  | 
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| 34 | public function __construct($containerName, $namespaceName)  | 
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| 40 | |||
| 41 | //Begin Implementation of IMetadataProvider  | 
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| 42 | |||
| 43 | public function getXML()  | 
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| 47 | |||
| 48 | /**  | 
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| 49 | * get the Container name for the data source.  | 
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| 50 | *  | 
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| 51 | * @return string container name  | 
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| 52 | */  | 
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| 53 | public function getContainerName()  | 
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| 57 | |||
| 58 | /**  | 
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| 59 | * get Namespace name for the data source.  | 
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| 60 | *  | 
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| 61 | * @return string namespace  | 
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| 62 | */  | 
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| 63 | public function getContainerNamespace()  | 
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| 67 | |||
| 68 | /**  | 
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| 69 | * get all entity set information.  | 
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| 70 | *  | 
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| 71 | * @return ResourceSet[]  | 
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| 72 | */  | 
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| 73 | public function getResourceSets($params = null)  | 
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| 100 | |||
| 101 | /**  | 
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| 102 | * get all resource types in the data source.  | 
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| 103 | *  | 
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| 104 | * @return ResourceType[]  | 
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| 105 | */  | 
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| 106 | public function getTypes()  | 
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| 110 | |||
| 111 | /**  | 
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| 112 | * get a resource set based on the specified resource set name.  | 
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| 113 | *  | 
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| 114 | * @param string $name Name of the resource set  | 
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| 115 | *  | 
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| 116 | * @return ResourceSet|null resource set with the given name if found else NULL  | 
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| 117 | */  | 
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| 118 | public function resolveResourceSet($name)  | 
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| 125 | |||
| 126 | /**  | 
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| 127 | * get a resource type based on the resource type name.  | 
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| 128 | *  | 
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| 129 | * @param string $name Name of the resource type  | 
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| 130 | *  | 
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| 131 | * @return ResourceType|null resource type with the given resource type name if found else NULL  | 
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| 132 | */  | 
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| 133 | public function resolveResourceType($name)  | 
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| 140 | |||
| 141 | /**  | 
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| 142 | * get a singelton based on the specified singleton name.  | 
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| 143 | *  | 
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| 144 | * @param string $name Name of the resource set  | 
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| 145 | *  | 
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| 146 | * @return ResourceFunctionType|null singleton with the given name if found else NULL  | 
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| 147 | */  | 
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| 148 | public function resolveSingleton($name)  | 
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| 155 | |||
| 156 | /**  | 
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| 157 | * get a resource set based on the specified resource association set name.  | 
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| 158 | *  | 
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| 159 | * @param string $name Name of the resource assocation set  | 
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| 160 | *  | 
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| 161 | * @return ResourceAssociationSet|null resource association set with the given name if found else NULL  | 
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| 162 | */  | 
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| 163 | public function resolveAssociationSet($name)  | 
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| 170 | |||
| 171 | /*  | 
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| 172 | * Get number of association sets hooked up  | 
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| 173 | */  | 
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| 174 | public function getAssociationCount()  | 
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| 178 | |||
| 179 | /**  | 
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| 180 | * The method must return a collection of all the types derived from  | 
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| 181 | * $resourceType The collection returned should NOT include the type  | 
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| 182 | * passed in as a parameter.  | 
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| 183 | *  | 
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| 184 | * @param ResourceEntityType $resourceType Resource to get derived resource types from  | 
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| 185 | *  | 
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| 186 | * @return ResourceType[]  | 
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| 187 | */  | 
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| 188 | public function getDerivedTypes(ResourceEntityType $resourceType)  | 
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| 192 | |||
| 193 | /**  | 
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| 194 | * @param ResourceType $resourceType Resource to check for derived resource types  | 
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| 195 | *  | 
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| 196 | * @return bool true if $resourceType represents an Entity Type which has derived Entity Types, else false  | 
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| 197 | */  | 
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| 198 | public function hasDerivedTypes(ResourceEntityType $resourceType)  | 
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| 202 | |||
| 203 | //End Implementation of IMetadataProvider  | 
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| 204 | |||
| 205 | /**  | 
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| 206 | * Gets the ResourceAssociationSet instance for the given source  | 
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| 207 | * association end.  | 
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| 208 | *  | 
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| 209 | * @param ResourceSet $sourceResourceSet Resource set  | 
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| 210 | * of the source  | 
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| 211 | * association end  | 
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| 212 | * @param ResourceType $sourceResourceType Resource type of the source  | 
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| 213 | * association end  | 
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| 214 | * @param ResourceProperty $targetResourceProperty Resource property of  | 
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| 215 | * the source  | 
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| 216 | * association end  | 
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| 217 | *  | 
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| 218 | * @return ResourceAssociationSet|null  | 
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| 219 | */  | 
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| 220 | public function getResourceAssociationSet(  | 
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| 259 | |||
| 260 | /**  | 
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| 261 | * Add an entity type.  | 
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| 262 | *  | 
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| 263 | * @param \ReflectionClass $refClass reflection class of the entity  | 
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| 264 | * @param string $name name of the entity  | 
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| 265 | * @return ResourceType when the name is already in use  | 
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| 266 | *  | 
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| 267 | * @throws InvalidOperationException when the name is already in use  | 
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| 268 | * @internal param string $namespace namespace of the data source  | 
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| 269 | *  | 
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| 270 | */  | 
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| 271 | public function addEntityType(\ReflectionClass $refClass, $name)  | 
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| 275 | |||
| 276 | /**  | 
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| 277 | * @param \ReflectionClass $refClass  | 
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| 278 | * @param string $name  | 
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| 279 | * @param $typeKind  | 
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| 280 | * @return ResourceType  | 
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| 281 | * @throws InvalidOperationException  | 
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| 282 | * @internal param null|string $namespace  | 
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| 283 | * @internal param null|ResourceType $baseResourceType  | 
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| 284 | *  | 
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| 285 | */  | 
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| 286 | private function createResourceType(  | 
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| 318 | |||
| 319 | /**  | 
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| 320 | * Add a complex type.  | 
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| 321 | *  | 
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| 322 | * @param \ReflectionClass $refClass reflection class of the complex entity type  | 
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| 323 | * @param string $name name of the entity  | 
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| 324 | * @return ResourceType when the name is already in use  | 
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| 325 | *  | 
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| 326 | * @throws InvalidOperationException when the name is already in use  | 
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| 327 | * @internal param string $namespace namespace of the data source  | 
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| 328 | * @internal param ResourceType $baseResourceType base resource type  | 
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| 329 | *  | 
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| 330 | */  | 
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| 331 | public function addComplexType(\ReflectionClass $refClass, $name)  | 
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| 335 | |||
| 336 | /**  | 
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| 337 | * @param string $name name of the resource set (now taken from resource type)  | 
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| 338 | * @param ResourceEntityType $resourceType resource type  | 
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| 339 | *  | 
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| 340 | * @throws InvalidOperationException  | 
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| 341 | *  | 
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| 342 | * @return ResourceSet  | 
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| 343 | */  | 
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| 344 | public function addResourceSet($name, ResourceEntityType $resourceType)  | 
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| 360 | |||
| 361 | /**  | 
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| 362 | * To add a Key-primitive property to a resource (Complex/Entity).  | 
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| 363 | *  | 
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| 364 | * @param ResourceType $resourceType resource type to which key property  | 
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| 365 | * is to be added  | 
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| 366 | * @param string $name name of the key property  | 
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| 367 | * @param TypeCode $typeCode type of the key property  | 
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| 368 | */  | 
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| 369 | public function addKeyProperty($resourceType, $name, $typeCode)  | 
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| 373 | |||
| 374 | /**  | 
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| 375 | * To add a Key/NonKey-primitive property to a resource (complex/entity).  | 
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| 376 | *  | 
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| 377 | * @param ResourceType $resourceType Resource type  | 
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| 378 | * @param string $name name of the property  | 
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| 379 | * @param TypeCode $typeCode type of property  | 
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| 380 | * @param bool $isKey property is key or not  | 
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| 381 | * @param bool $isBag property is bag or not  | 
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| 382 | * @param bool $isETagProperty property is etag or not  | 
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| 383 | */  | 
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| 384 | private function _addPrimitivePropertyInternal(  | 
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| 433 | |||
| 434 | /**  | 
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| 435 | * @param string $name  | 
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| 436 | * @param ResourceType $resourceType  | 
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| 437 | *  | 
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| 438 | * @throws InvalidOperationException  | 
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| 439 | */  | 
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| 440 | private function checkInstanceProperty($name, ResourceType $resourceType)  | 
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| 457 | |||
| 458 | /**  | 
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| 459 | * To add a NonKey-primitive property (Complex/Entity).  | 
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| 460 | *  | 
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| 461 | * @param ResourceType $resourceType resource type to which key property  | 
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| 462 | * is to be added  | 
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| 463 | * @param string $name name of the key property  | 
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| 464 | * @param TypeCode $typeCode type of the key property  | 
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| 465 | * @param bool $isBag property is bag or not  | 
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| 466 | */  | 
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| 467 | View Code Duplication | public function addPrimitiveProperty(  | 
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| 486 | |||
| 487 | /**  | 
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| 488 | * To add a non-key etag property.  | 
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| 489 | *  | 
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| 490 | * @param ResourceType $resourceType resource type to which key property  | 
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| 491 | * is to be added  | 
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| 492 | * @param string $name name of the property  | 
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| 493 | * @param TypeCode $typeCode type of the etag property  | 
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| 494 | */  | 
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| 495 | View Code Duplication | public function addETagProperty($resourceType, $name, $typeCode, $defaultValue = null, $nullable = false)  | 
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| 508 | |||
| 509 | /**  | 
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| 510 | * To add a resource reference property.  | 
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| 511 | *  | 
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| 512 | * @param ResourceEntityType $resourceType The resource type to add the resource  | 
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| 513 | * reference property to  | 
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| 514 | * @param string $name The name of the property to add  | 
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| 515 | * @param ResourceSet $targetResourceSet The resource set the resource reference  | 
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| 516 | * property points to  | 
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| 517 | */  | 
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| 518 | public function addResourceReferenceProperty($resourceType, $name, $targetResourceSet)  | 
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| 527 | |||
| 528 | /**  | 
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| 529 | * To add a 1:N resource reference property.  | 
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| 530 | *  | 
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| 531 | * @param ResourceType $sourceResourceType The resource type to add the resource  | 
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| 532 | * reference property from  | 
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| 533 | * @param ResourceType $targetResourceType The resource type to add the resource  | 
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| 534 | * reference property to  | 
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| 535 | * @param string $sourceProperty The name of the property to add, on source type  | 
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| 536 | * @param string $targetProperty The name of the property to add, on target type  | 
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| 537 | */  | 
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| 538 | public function addResourceReferencePropertyBidirectional(  | 
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| 553 | |||
| 554 | /**  | 
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| 555 | * To add a navigation property (resource set or resource reference)  | 
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| 556 | * to a resource type.  | 
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| 557 | *  | 
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| 558 | * @param ResourceEntityType $sourceResourceType The resource type to add  | 
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| 559 | * the resource reference  | 
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| 560 | * or resource  | 
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| 561 | * reference set property to  | 
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| 562 | * @param string $name The name of the  | 
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| 563 | * property to add  | 
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| 564 | * @param ResourceSet $targetResourceSet The resource set the  | 
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| 565 | * resource reference  | 
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| 566 | * or reference  | 
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| 567 | * set property  | 
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| 568 | * points to  | 
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| 569 | * @param string $resourceMult The multiplicity of relation being added  | 
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| 570 | */  | 
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| 571 | private function _addReferencePropertyInternal(  | 
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| 626 | |||
| 627 | /**  | 
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| 628 | * To add a navigation property (resource set or resource reference)  | 
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| 629 | * to a resource type.  | 
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| 630 | *  | 
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| 631 | * @param ResourceEntityType $sourceResourceType The source resource type to add  | 
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| 632 | * the resource reference  | 
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| 633 | * or resource reference set property to  | 
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| 634 | * @param ResourceEntityType $targetResourceType The target resource type to add  | 
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| 635 | * the resource reference  | 
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| 636 | * or resource reference set property to  | 
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| 637 | * @param string $sourceProperty The name of the  | 
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| 638 | * property to add to source type  | 
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| 639 | * @param string $targetProperty The name of the  | 
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| 640 | * property to add to target type  | 
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| 641 | * @param string $sourceMultiplicity The multiplicity at the source end of relation  | 
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| 642 | * @param string $targetMultiplicity The multiplicity at the target end of relation  | 
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| 643 | */  | 
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| 644 | private function _addReferencePropertyInternalBidirectional(  | 
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| 733 | |||
| 734 | /**  | 
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| 735 | * To add a resource set reference property.  | 
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| 736 | *  | 
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| 737 | * @param ResourceEntityType $resourceType The resource type to add the  | 
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| 738 | * resource reference set property to  | 
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| 739 | * @param string $name The name of the property to add  | 
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| 740 | * @param ResourceSet $targetResourceSet The resource set the resource  | 
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| 741 | * reference set property points to  | 
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| 742 | */  | 
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| 743 | public function addResourceSetReferenceProperty(ResourceEntityType $resourceType, $name, $targetResourceSet)  | 
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| 752 | |||
| 753 | /**  | 
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| 754 | * To add a M:N resource reference property.  | 
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| 755 | *  | 
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| 756 | * @param ResourceEntityType $sourceResourceType The resource type to add the resource  | 
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| 757 | * reference property from  | 
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| 758 | * @param ResourceEntityType $targetResourceType The resource type to add the resource  | 
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| 759 | * reference property to  | 
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| 760 | * @param string $sourceProperty The name of the property to add, on source type  | 
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| 761 | * @param string $targetProperty The name of the property to add, on target type  | 
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| 762 | */  | 
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| 763 | public function addResourceSetReferencePropertyBidirectional(  | 
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| 778 | |||
| 779 | /**  | 
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| 780 | * To add a 1-1 resource reference.  | 
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| 781 | *  | 
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| 782 | * @param ResourceEntityType $sourceResourceType The resource type to add the resource  | 
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| 783 | * reference property from  | 
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| 784 | * @param ResourceEntityType $targetResourceType The resource type to add the resource  | 
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| 785 | * reference property to  | 
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| 786 | * @param string $sourceProperty The name of the property to add, on source type  | 
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| 787 | * @param string $targetProperty The name of the property to add, on target type  | 
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| 788 | */  | 
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| 789 | public function addResourceReferenceSinglePropertyBidirectional(  | 
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| 804 | |||
| 805 | /**  | 
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| 806 | * To add a complex property to entity or complex type.  | 
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| 807 | *  | 
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| 808 | * @param ResourceType $targetResourceType The resource type to which the complex property needs to add  | 
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| 809 | * @param string $name name of the complex property  | 
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| 810 | * @param ResourceComplexType $complexResourceType complex resource type  | 
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| 811 | * @param bool $isBag complex type is bag or not  | 
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| 812 | *  | 
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| 813 | * @return ResourceProperty  | 
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| 814 | */  | 
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| 815 | public function addComplexProperty(  | 
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| 846 | |||
| 847 | public function createSingleton($name, ResourceType $returnType, $functionName)  | 
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| 871 | |||
| 872 | public function getSingletons()  | 
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| 876 | |||
| 877 | public function callSingleton($name)  | 
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| 886 | }  | 
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| 887 | 
It seems like the type of the argument is not accepted by the function/method which you are calling.
In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.
We suggest to add an explicit type cast like in the following example: