Doctrine\ODM\MongoDB\Tools\DocumentGenerator::generateDocumentStubMethods PHP Method

    private function generateDocumentStubMethods(ClassMetadataInfo $metadata)
    {
        $methods = array();
        foreach ($metadata->fieldMappings as $fieldMapping) {
            if (isset($fieldMapping['id'])) {
                if ($metadata->generatorType == ClassMetadataInfo::GENERATOR_TYPE_NONE) {
                    if ($code = $this->generateDocumentStubMethod($metadata, 'set', $fieldMapping['fieldName'], $fieldMapping['type'])) {
                        $methods[] = $code;
                    }
                }
                if ($code = $code = $this->generateDocumentStubMethod($metadata, 'get', $fieldMapping['fieldName'], $fieldMapping['type'])) {
                    $methods[] = $code;
                }
            } elseif (!isset($fieldMapping['association'])) {
                if ($code = $code = $this->generateDocumentStubMethod($metadata, 'set', $fieldMapping['fieldName'], $fieldMapping['type'])) {
                    $methods[] = $code;
                }
                if ($code = $code = $this->generateDocumentStubMethod($metadata, 'get', $fieldMapping['fieldName'], $fieldMapping['type'])) {
                    $methods[] = $code;
                }
            } elseif ($fieldMapping['type'] === ClassMetadataInfo::ONE) {
                $nullable = $this->isAssociationNullable($fieldMapping) ? 'null' : null;
                if ($code = $this->generateDocumentStubMethod($metadata, 'set', $fieldMapping['fieldName'], isset($fieldMapping['targetDocument']) ? $fieldMapping['targetDocument'] : null, $nullable)) {
                    $methods[] = $code;
                }
                if ($code = $this->generateDocumentStubMethod($metadata, 'get', $fieldMapping['fieldName'], isset($fieldMapping['targetDocument']) ? $fieldMapping['targetDocument'] : null)) {
                    $methods[] = $code;
                }
            } elseif ($fieldMapping['type'] === ClassMetadataInfo::MANY) {
                if ($code = $this->generateDocumentStubMethod($metadata, 'add', $fieldMapping['fieldName'], isset($fieldMapping['targetDocument']) ? $fieldMapping['targetDocument'] : null)) {
                    $methods[] = $code;
                }
                if ($code = $this->generateDocumentStubMethod($metadata, 'remove', $fieldMapping['fieldName'], isset($fieldMapping['targetDocument']) ? $fieldMapping['targetDocument'] : null)) {
                    $methods[] = $code;
                }
                if ($code = $this->generateDocumentStubMethod($metadata, 'get', $fieldMapping['fieldName'], '\\Doctrine\\Common\\Collections\\Collection')) {
                    $methods[] = $code;
                }
            }
        }
        return implode("\n\n", $methods);
    }