/**
* Write the metadata in CSDL format.
*
* @return string
*/
public function writeMetadata()
{
$this->_metadataManager = MetadataManager::create($this->providersWrapper);
$this->_dataServiceVersion = new Version(1, 0);
$edmSchemaVersion = $this->providersWrapper->getEdmSchemaVersion();
$this->_metadataManager->getDataServiceAndEdmSchemaVersions($this->_dataServiceVersion, $edmSchemaVersion);
$this->_xmlWriter = new \XMLWriter();
$this->_xmlWriter->openMemory();
$this->_xmlWriter->setIndent(4);
$this->_writeTopLevelElements($this->_dataServiceVersion->toString());
$resourceTypesInContainerNamespace = array();
$containerNamespace = $this->providersWrapper->getContainerNamespace();
foreach ($this->_metadataManager->getResourceTypesAlongWithNamespace() as $resourceTypeNamespace => $resourceTypesWithName) {
if ($resourceTypeNamespace == $containerNamespace) {
foreach ($resourceTypesWithName as $resourceTypeName => $resourceType) {
$resourceTypesInContainerNamespace[] = $resourceType;
}
} else {
$associationsInThisNamespace = $this->_metadataManager->getResourceAssociationTypesForNamespace($resourceTypeNamespace);
$this->_writeSchemaElement($resourceTypeNamespace, $edmSchemaVersion);
$uniqueAssociationsInThisNamespace = $this->_metadataManager->getUniqueResourceAssociationTypesForNamespace($resourceTypeNamespace);
$this->_writeResourceTypes(array_values($resourceTypesWithName), $associationsInThisNamespace);
$this->_writeAssociationTypes($uniqueAssociationsInThisNamespace);
}
}
//write Container schema node and define required nmaespaces
$this->_writeSchemaElement($resourceTypeNamespace, $edmSchemaVersion);
if (!empty($resourceTypesInContainerNamespace)) {
//Get assocation types in container namespace as array of
//key-value pairs (with key as association type
//lookup key i.e. ResourceType::Name_NavigationProperty::Name.
//Same association will appear twice for di-directional relationship
//(duplicate value will be there in this case)
$associationsInThisNamespace = $this->_metadataManager->getResourceAssociationTypesForNamespace($containerNamespace);
//Get association type in container namespace as array of unique values
$uniqueAssociationsInThisNamespace = $this->_metadataManager->getUniqueResourceAssociationTypesForNamespace($containerNamespace);
$this->_writeResourceTypes($resourceTypesInContainerNamespace, $associationsInThisNamespace);
$this->_writeAssociationTypes($uniqueAssociationsInThisNamespace);
}
$this->_writeEntityContainer();
//End container Schema node
$this->_xmlWriter->endElement();
//End edmx:Edmx and edmx:DataServices nodes
$this->_xmlWriter->endElement();
$this->_xmlWriter->endElement();
$metadataInCsdl = $this->_xmlWriter->outputMemory(true);
return $metadataInCsdl;
}