class XmlFileLoader

class XmlFileLoader extends FileLoader {
    
    /**
     * The XML nodes of the mapping file.
     *
     * @var \SimpleXMLElement[]
     */
    protected array $classes;
    public function __construct(string $file) {
        $this->file = $file;
    }
    public function loadClassMetadata(ClassMetadata $metadata) : bool {
        if (!isset($this->classes)) {
            $this->loadClassesFromXml();
        }
        if (isset($this->classes[$metadata->getClassName()])) {
            $classDescription = $this->classes[$metadata->getClassName()];
            $this->loadClassMetadataFromXml($metadata, $classDescription);
            return true;
        }
        return false;
    }
    
    /**
     * Return the names of the classes mapped in this file.
     *
     * @return string[]
     */
    public function getMappedClasses() : array {
        if (!isset($this->classes)) {
            $this->loadClassesFromXml();
        }
        return array_keys($this->classes);
    }
    
    /**
     * Parses a collection of "constraint" XML nodes.
     *
     * @param \SimpleXMLElement $nodes The XML nodes
     *
     * @return Constraint[]
     */
    protected function parseConstraints(\SimpleXMLElement $nodes) : array {
        $constraints = [];
        foreach ($nodes as $node) {
            if (\count($node) > 0) {
                if (\count($node->value) > 0) {
                    $options = [
                        'value' => $this->parseValues($node->value),
                    ];
                }
                elseif (\count($node->constraint) > 0) {
                    $options = $this->parseConstraints($node->constraint);
                }
                elseif (\count($node->option) > 0) {
                    $options = $this->parseOptions($node->option);
                }
                else {
                    $options = [];
                }
            }
            elseif ('' !== (string) $node) {
                $options = XmlUtils::phpize(trim($node));
            }
            else {
                $options = null;
            }
            if (isset($options['groups']) && !\is_array($options['groups'])) {
                $options['groups'] = (array) $options['groups'];
            }
            $constraints[] = $this->newConstraint((string) $node['name'], $options);
        }
        return $constraints;
    }
    
    /**
     * Parses a collection of "value" XML nodes.
     *
     * @param \SimpleXMLElement $nodes The XML nodes
     */
    protected function parseValues(\SimpleXMLElement $nodes) : array {
        $values = [];
        foreach ($nodes as $node) {
            if (\count($node) > 0) {
                if (\count($node->value) > 0) {
                    $value = $this->parseValues($node->value);
                }
                elseif (\count($node->constraint) > 0) {
                    $value = $this->parseConstraints($node->constraint);
                }
                else {
                    $value = [];
                }
            }
            else {
                $value = trim($node);
            }
            if (isset($node['key'])) {
                $values[(string) $node['key']] = $value;
            }
            else {
                $values[] = $value;
            }
        }
        return $values;
    }
    
    /**
     * Parses a collection of "option" XML nodes.
     *
     * @param \SimpleXMLElement $nodes The XML nodes
     */
    protected function parseOptions(\SimpleXMLElement $nodes) : array {
        $options = [];
        foreach ($nodes as $node) {
            if (\count($node) > 0) {
                if (\count($node->value) > 0) {
                    $value = $this->parseValues($node->value);
                }
                elseif (\count($node->constraint) > 0) {
                    $value = $this->parseConstraints($node->constraint);
                }
                else {
                    $value = [];
                }
            }
            else {
                $value = XmlUtils::phpize($node);
                if (\is_string($value)) {
                    $value = trim($value);
                }
            }
            $options[(string) $node['name']] = $value;
        }
        return $options;
    }
    
    /**
     * Loads the XML class descriptions from the given file.
     *
     * @throws MappingException If the file could not be loaded
     */
    protected function parseFile(string $path) : \SimpleXMLElement {
        try {
            $dom = XmlUtils::loadFile($path, __DIR__ . '/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd');
        } catch (\Exception $e) {
            throw new MappingException($e->getMessage(), $e->getCode(), $e);
        }
        return simplexml_import_dom($dom);
    }
    private function loadClassesFromXml() : void {
        parent::__construct($this->file);
        // This method may throw an exception. Do not modify the class'
        // state before it completes
        $xml = $this->parseFile($this->file);
        $this->classes = [];
        foreach ($xml->namespace as $namespace) {
            $this->addNamespaceAlias((string) $namespace['prefix'], trim((string) $namespace));
        }
        foreach ($xml->class as $class) {
            $this->classes[(string) $class['name']] = $class;
        }
    }
    private function loadClassMetadataFromXml(ClassMetadata $metadata, \SimpleXMLElement $classDescription) : void {
        if (\count($classDescription->{'group-sequence-provider'}) > 0) {
            $metadata->setGroupProvider($classDescription->{'group-sequence-provider'}[0]->value ?: null);
            $metadata->setGroupSequenceProvider(true);
        }
        foreach ($classDescription->{'group-sequence'} as $groupSequence) {
            if (\count($groupSequence->value) > 0) {
                $metadata->setGroupSequence($this->parseValues($groupSequence[0]->value));
            }
        }
        foreach ($this->parseConstraints($classDescription->constraint) as $constraint) {
            $metadata->addConstraint($constraint);
        }
        foreach ($classDescription->property as $property) {
            foreach ($this->parseConstraints($property->constraint) as $constraint) {
                $metadata->addPropertyConstraint((string) $property['name'], $constraint);
            }
        }
        foreach ($classDescription->getter as $getter) {
            foreach ($this->parseConstraints($getter->constraint) as $constraint) {
                $metadata->addGetterConstraint((string) $getter['property'], $constraint);
            }
        }
    }

}