first commit

wp-content/plugins/sitepress-multilingual-cms/classes/hooks/adjacent-links/class-wpml-adjacent-links-hooks-factory.php

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+<?php
+
+/**
+ * Class WPML_Adjacent_Links_Hooks_Factory
+ *
+ * @author OnTheGoSystems
+ */
+class WPML_Adjacent_Links_Hooks_Factory implements IWPML_Frontend_Action_Loader, IWPML_Backend_Action_Loader, IWPML_AJAX_Action_Loader {
+
+	/** @return WPML_Adjacent_Links_Hooks */
+	public function create() {
+		global $sitepress, $wpdb;
+
+		return new WPML_Adjacent_Links_Hooks(
+			$sitepress,
+			$wpdb,
+			new WPML_Language_Where_Clause(
+				$sitepress,
+				$wpdb,
+				new WPML_Display_As_Translated_Posts_Query( $wpdb, 'p' )
+			)
+		);
+	}
+}

wp-content/plugins/sitepress-multilingual-cms/classes/hooks/adjacent-links/class-wpml-adjacent-links-hooks.php

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+<?php
+
+/**
+ * Class WPML_Adjacent_Links_Hooks
+ *
+ * @author OnTheGoSystems
+ */
+class WPML_Adjacent_Links_Hooks implements IWPML_Action {
+
+	/** @var SitePress $sitepress */
+	private $sitepress;
+
+	/** @var wpdb $wpdb */
+	private $wpdb;
+
+	/** @var WPML_Language_Where_Clause $language_where_clause */
+	private $language_where_clause;
+
+	/**
+	 * WPML_Adjacent_Links_Hooks constructor.
+	 *
+	 * @param SitePress                  $sitepress
+	 * @param wpdb                       $wpdb
+	 * @param WPML_Language_Where_Clause $language_where_clause
+	 */
+	public function __construct( SitePress $sitepress, wpdb $wpdb, WPML_Language_Where_Clause $language_where_clause ) {
+		$this->sitepress             = $sitepress;
+		$this->wpdb                  = $wpdb;
+		$this->language_where_clause = $language_where_clause;
+	}
+
+	public function add_hooks() {
+		add_filter( 'get_previous_post_join', array( $this, 'get_adjacent_post_join' ) );
+		add_filter( 'get_next_post_join', array( $this, 'get_adjacent_post_join' ) );
+		add_filter( 'get_previous_post_where', array( $this, 'get_adjacent_post_where' ) );
+		add_filter( 'get_next_post_where', array( $this, 'get_adjacent_post_where' ) );
+	}
+
+	/**
+	 * @param string $join_clause
+	 *
+	 * @return string
+	 */
+	function get_adjacent_post_join( $join_clause ) {
+		$post_type = $this->get_current_post_type();
+
+		$cache_key   = md5( wp_json_encode( array( $post_type, $join_clause ) ) );
+		$cache_group = 'adjacent_post_join';
+		$join_cached = wp_cache_get( $cache_key, $cache_group );
+
+		if ( $join_cached ) {
+			return $join_cached;
+		}
+
+		if ( $this->sitepress->is_translated_post_type( $post_type ) ) {
+			$join_clause .= $this->wpdb->prepare(
+				" JOIN {$this->wpdb->prefix}icl_translations wpml_translations ON wpml_translations.element_id = p.ID AND wpml_translations.element_type = %s",
+				'post_' . $post_type
+			);
+		}
+
+		wp_cache_set( $cache_key, $join_clause, $cache_group );
+
+		return $join_clause;
+	}
+
+	/**
+	 * @param string $where_clause
+	 *
+	 * @return string
+	 */
+	function get_adjacent_post_where( $where_clause ) {
+		$post_type    = $this->get_current_post_type();
+		$current_lang = $this->sitepress->get_current_language();
+
+		$cache_key    = md5( wp_json_encode( array( $post_type, $where_clause, $current_lang ) ) );
+		$cache_group  = 'adjacent_post_where';
+		$where_cached = wp_cache_get( $cache_key, $cache_group );
+
+		if ( $where_cached ) {
+			return $where_cached;
+		}
+
+		$where_clause .= $this->language_where_clause->get( $post_type );
+
+		wp_cache_set( $cache_key, $where_clause, $cache_group );
+
+		return $where_clause;
+	}
+
+	/** @return string */
+	private function get_current_post_type() {
+		return get_post_type() ?: 'post';
+	}
+}