class StringBase

abstract class StringBase implements StringInterface {
    
    /**
     * The string identifier.
     *
     * @var int
     */
    public $lid;
    
    /**
     * The string locations indexed by type.
     *
     * @var string
     */
    public $locations;
    
    /**
     * The source string.
     *
     * @var string
     */
    public $source;
    
    /**
     * The string context.
     *
     * @var string
     */
    public $context;
    
    /**
     * The string version.
     *
     * @var string
     */
    public $version;
    
    /**
     * The locale storage this string comes from or is to be saved to.
     *
     * @var \Drupal\locale\StringStorageInterface
     */
    protected $storage;
    
    /**
     * Constructs a new locale string object.
     *
     * @param object|array $values
     *   Object or array with initial values.
     */
    public function __construct($values = []) {
        $this->setValues((array) $values);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getId() {
        return $this->lid ?? NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setId($lid) {
        $this->lid = $lid;
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getVersion() {
        return $this->version ?? NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setVersion($version) {
        $this->version = $version;
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getPlurals() {
        return explode(PoItem::DELIMITER, $this->getString());
    }
    
    /**
     * {@inheritdoc}
     */
    public function setPlurals($plurals) {
        $this->setString(implode(PoItem::DELIMITER, $plurals));
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getStorage() {
        return $this->storage ?? NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setStorage($storage) {
        $this->storage = $storage;
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setValues(array $values, $override = TRUE) {
        foreach ($values as $key => $value) {
            if (property_exists($this, $key) && ($override || !isset($this->{$key}))) {
                $this->{$key} = $value;
            }
        }
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getValues(array $fields) {
        $values = [];
        foreach ($fields as $field) {
            if (isset($this->{$field})) {
                $values[$field] = $this->{$field};
            }
        }
        return $values;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getLocations($check_only = FALSE) {
        if (!isset($this->locations) && !$check_only) {
            $this->locations = [];
            foreach ($this->getStorage()
                ->getLocations([
                'sid' => $this->getId(),
            ]) as $location) {
                $this->locations[$location->type][$location->name] = $location->lid;
            }
        }
        return $this->locations ?? [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function addLocation($type, $name) {
        $this->locations[$type][$name] = TRUE;
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function hasLocation($type, $name) {
        $locations = $this->getLocations();
        return isset($locations[$type]) ? !empty($locations[$type][$name]) : FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function save() {
        if ($storage = $this->getStorage()) {
            $storage->save($this);
        }
        else {
            throw new StringStorageException('The string cannot be saved because its not bound to a storage: ' . $this->getString());
        }
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function delete() {
        if (!$this->isNew()) {
            if ($storage = $this->getStorage()) {
                $storage->delete($this);
            }
            else {
                throw new StringStorageException('The string cannot be deleted because its not bound to a storage: ' . $this->getString());
            }
        }
        return $this;
    }

}