interface StringInterface

interface StringInterface {
    
    /**
     * Gets the string unique identifier.
     *
     * @return int
     *   The string identifier.
     */
    public function getId();
    
    /**
     * Sets the string unique identifier.
     *
     * @param int $id
     *   The string identifier.
     *
     * @return $this
     */
    public function setId($id);
    
    /**
     * Gets the string version.
     *
     * @return string
     *   Version identifier.
     */
    public function getVersion();
    
    /**
     * Sets the string version.
     *
     * @param string $version
     *   Version identifier.
     *
     * @return $this
     */
    public function setVersion($version);
    
    /**
     * Gets plain string contained in this object.
     *
     * @return string
     *   The string contained in this object.
     */
    public function getString();
    
    /**
     * Sets the string contained in this object.
     *
     * @param string $string
     *   String to set as value.
     *
     * @return $this
     */
    public function setString($string);
    
    /**
     * Splits string to work with plural values.
     *
     * @return array
     *   Array of strings that are plural variants.
     */
    public function getPlurals();
    
    /**
     * Sets this string using array of plural values.
     *
     * Serializes plural variants in one string glued by
     * \Drupal\Component\Gettext\PoItem::DELIMITER.
     *
     * @param array $plurals
     *   Array of strings with plural variants.
     *
     * @return $this
     */
    public function setPlurals($plurals);
    
    /**
     * Gets the string storage.
     *
     * @return \Drupal\locale\StringStorageInterface
     *   The storage used for this string.
     */
    public function getStorage();
    
    /**
     * Sets the string storage.
     *
     * @param \Drupal\locale\StringStorageInterface $storage
     *   The storage to use for this string.
     *
     * @return $this
     */
    public function setStorage($storage);
    
    /**
     * Checks whether the object is not saved to storage yet.
     *
     * @return bool
     *   TRUE if the object exists in the storage, FALSE otherwise.
     */
    public function isNew();
    
    /**
     * Checks whether the object is a source string.
     *
     * @return bool
     *   TRUE if the object is a source string, FALSE otherwise.
     */
    public function isSource();
    
    /**
     * Checks whether the object is a translation string.
     *
     * @return bool
     *   TRUE if the object is a translation string, FALSE otherwise.
     */
    public function isTranslation();
    
    /**
     * Sets an array of values as object properties.
     *
     * @param array $values
     *   Array with values indexed by property name.
     * @param bool $override
     *   (optional) Whether to override already set fields, defaults to TRUE.
     *
     * @return $this
     */
    public function setValues(array $values, $override = TRUE);
    
    /**
     * Gets field values that are set for given field names.
     *
     * @param array $fields
     *   Array of field names.
     *
     * @return array
     *   Array of field values indexed by field name.
     */
    public function getValues(array $fields);
    
    /**
     * Gets location information for this string.
     *
     * Locations are arbitrary pairs of type and name strings, used to store
     * information about the origins of the string, like the file name it
     * was found on, the path on which it was discovered, etc.
     *
     * A string can have any number of locations since the same string may be
     * found on different places of Drupal code and configuration.
     *
     * @param bool $check_only
     *   (optional) Set to TRUE to get only new locations added during the
     *   current page request and not loading all existing locations.
     *
     * @return array
     *   Location ids indexed by type and name.
     */
    public function getLocations($check_only = FALSE);
    
    /**
     * Adds a location for this string.
     *
     * @param string $type
     *   Location type that may be any arbitrary string. Types used in Drupal
     *   core are: 'javascript', 'path', 'code', 'configuration'.
     * @param string $name
     *   Location name. Drupal path in case of online discovered translations,
     *   file path in case of imported strings, configuration name for strings
     *   that come from configuration, etc.
     *
     * @return $this
     */
    public function addLocation($type, $name);
    
    /**
     * Checks whether the string has a given location.
     *
     * @param string $type
     *   Location type.
     * @param string $name
     *   Location name.
     *
     * @return bool
     *   TRUE if the string has a location with this type and name.
     */
    public function hasLocation($type, $name);
    
    /**
     * Saves string object to storage.
     *
     * @return $this
     *
     * @throws \Drupal\locale\StringStorageException
     *   In case of failures, an exception is thrown.
     */
    public function save();
    
    /**
     * Deletes string object from storage.
     *
     * @return $this
     *
     * @throws \Drupal\locale\StringStorageException
     *   In case of failures, an exception is thrown.
     */
    public function delete();

}