/wp-content/plugins/polylang-pro/include/translated-term.php

<?php



/**

 * Setups the taxonomies languages and translations model

 *

 * @since 1.8

 */

class PLL_Translated_Term extends PLL_Translated_Object {



	/**

	 * Constructor

	 *

	 * @since 1.8

	 *

	 * @param object $model

	 */

	public function __construct( &$model ) {

		$this->object_type = 'term';

		$this->tax_language = 'term_language';

		$this->tax_translations = 'term_translations';

		$this->tax_tt = 'tl_term_taxonomy_id';



		parent::__construct( $model );



		// filters to prime terms cache

		add_filter( 'get_terms', array( &$this, '_prime_terms_cache' ), 10, 2 );

		add_filter( 'wp_get_object_terms', array( &$this, 'wp_get_object_terms' ), 10, 3 );

	}



	/**

	 * Stores the term language in the database

	 *

	 * @since 0.6

	 *

	 * @param int               $term_id term id

	 * @param int|string|object $lang    language ( term_id or slug or object )

	 */

	public function set_language( $term_id, $lang ) {

		$term_id = (int) $term_id;

		wp_set_object_terms( $term_id, $lang ? $this->model->get_language( $lang )->tl_term_id : '', 'term_language' );



		// add translation group for correct WXR export

		$translations = $this->get_translations( $term_id );

		if ( $slug = array_search( $term_id, $translations ) ) {

			unset( $translations[ $slug ] );

		}



		$this->save_translations( $term_id, $translations );

	}



	/**

	 * Removes the term language in database

	 *

	 * @since 0.5

	 *

	 * @param int $term_id term id

	 */

	public function delete_language( $term_id ) {

		wp_delete_object_term_relationships( $term_id, 'term_language' );

	}



	/**

	 * Returns the language of a term

	 *

	 * @since 0.1

	 *

	 * @param int|string $value    term id or term slug

	 * @param string     $taxonomy optional taxonomy needed when the term slug is passed as first parameter

	 * @return bool|object PLL_Language object, false if no language is associated to that term

	 */

	public function get_language( $value, $taxonomy = '' ) {

		if ( is_numeric( $value ) ) {

			$term_id = $value;

		}



		// get_term_by still not cached in WP 3.5.1 but internally, the function is always called by term_id

		elseif ( is_string( $value ) && $taxonomy ) {

			$term_id = get_term_by( 'slug', $value , $taxonomy )->term_id;

		}



		// get the language and make sure it is a PLL_Language object

		return isset( $term_id ) && ( $lang = $this->get_object_term( $term_id, 'term_language' ) ) ? $this->model->get_language( $lang->term_id ) : false;

	}



	/**

	 * Tells the parent class to always store a translation term

	 *

	 * @since 1.8

	 *

	 * @param array $translations: an associative array of translations with language code as key and translation id as value

	 */

	protected function keep_translation_group( $translations ) {

		return true;

	}



	/**

	 * Deletes a translation

	 *

	 * @since 0.5

	 *

	 * @param int $id term id

	 */

	public function delete_translation( $id ) {

		global $wpdb;

		$slug = array_search( $id, $this->get_translations( $id ) ); // in case some plugin stores the same value with different key



		parent::delete_translation( $id );



		if ( $wpdb->get_var( $wpdb->prepare( "SELECT COUNT( * ) FROM $wpdb->terms WHERE term_id = %d;", $id ) ) ) {

			// always keep a group for terms to allow relationships remap when importing from a WXR file

			$translations[ $slug ] = $id;

			wp_insert_term( $group = uniqid( 'pll_' ), 'term_translations', array( 'description' => serialize( $translations ) ) );

			wp_set_object_terms( $id, $group, 'term_translations' );

		}

	}



	/**

	 * A join clause to add to sql queries when filtering by language is needed directly in query

	 *

	 * @since 1.2

	 *

	 * @return string join clause

	 */

	public function join_clause() {

		global $wpdb;

		return " INNER JOIN $wpdb->term_relationships AS pll_tr ON pll_tr.object_id = t.term_id";

	}



	/**

	 * Cache language and translations when terms are queried by get_terms

	 *

	 * @since 1.2

	 *

	 * @param array $terms      queried terms

	 * @param array $taxonomies queried taxonomies

	 * @return array unmodified $terms

	 */

	public function _prime_terms_cache( $terms, $taxonomies ) {

		if ( $this->model->is_translated_taxonomy( $taxonomies ) ) {

			foreach ( $terms as $term ) {

				$term_ids[] = is_object( $term ) ? $term->term_id : (int) $term;

			}

		}



		if ( ! empty( $term_ids ) ) {

			update_object_term_cache( array_unique( $term_ids ), 'term' ); // adds language and translation of terms to cache

		}

		return $terms;

	}



	/**

	 * When terms are found for posts, add their language and translations to cache

	 *

	 * @since 1.2

	 *

	 * @param array $terms      terms found

	 * @param array $object_ids not used

	 * @param array $taxonomies terms taxonomies

	 * @return array unmodified $terms

	 */

	public function wp_get_object_terms( $terms, $object_ids, $taxonomies ) {

		$taxonomies = explode( "', '", trim( $taxonomies, "'" ) );

		if ( ! in_array( 'term_translations', $taxonomies ) ) {

			$this->_prime_terms_cache( $terms, $taxonomies );

		}

		return $terms;

	}

}