protected static function get_where_sql( $args = array(), $select_sql = '', $from_sql = '', $join_sql = '', $meta_query_sql = '' ) {
		global $wpdb;

		$where_conditions = array();
		$where            = '';

		// The id.
		if ( ! empty( $args['id'] ) ) {
			$id_in = implode( ',', wp_parse_id_list( $args['id'] ) );
			$where_conditions['id'] = "id IN ({$id_in})";
		}

		// The user_id.
		if ( ! empty( $args['user_id'] ) ) {
			$user_id_in = implode( ',', wp_parse_id_list( $args['user_id'] ) );
			$where_conditions['user_id'] = "user_id IN ({$user_id_in})";
		}

		// The item_id.
		if ( ! empty( $args['item_id'] ) ) {
			$item_id_in = implode( ',', wp_parse_id_list( $args['item_id'] ) );
			$where_conditions['item_id'] = "item_id IN ({$item_id_in})";
		}

		// The secondary_item_id.
		if ( ! empty( $args['secondary_item_id'] ) ) {
			$secondary_item_id_in = implode( ',', wp_parse_id_list( $args['secondary_item_id'] ) );
			$where_conditions['secondary_item_id'] = "secondary_item_id IN ({$secondary_item_id_in})";
		}

		// The component_name.
		if ( ! empty( $args['component_name'] ) ) {
			if ( ! is_array( $args['component_name'] ) ) {
				$component_names = explode( ',', $args['component_name'] );
			} else {
				$component_names = $args['component_name'];
			}

			$cn_clean = array();
			foreach ( $component_names as $cn ) {
				$cn_clean[] = $wpdb->prepare( '%s', $cn );
			}

			$cn_in = implode( ',', $cn_clean );
			$where_conditions['component_name'] = "component_name IN ({$cn_in})";
		}

		// The component_action.
		if ( ! empty( $args['component_action'] ) ) {
			if ( ! is_array( $args['component_action'] ) ) {
				$component_actions = explode( ',', $args['component_action'] );
			} else {
				$component_actions = $args['component_action'];
			}

			$ca_clean = array();
			foreach ( $component_actions as $ca ) {
				$ca_clean[] = $wpdb->prepare( '%s', $ca );
			}

			$ca_in = implode( ',', $ca_clean );
			$where_conditions['component_action'] = "component_action IN ({$ca_in})";
		}

		// If is_new.
		if ( ! empty( $args['is_new'] ) && 'both' !== $args['is_new'] ) {
			$where_conditions['is_new'] = "is_new = 1";
		} elseif ( isset( $args['is_new'] ) && ( 0 === $args['is_new'] || false === $args['is_new'] ) ) {
			$where_conditions['is_new'] = "is_new = 0";
		}

		// The search_terms.
		if ( ! empty( $args['search_terms'] ) ) {
			$search_terms_like = '%' . bp_esc_like( $args['search_terms'] ) . '%';
			$where_conditions['search_terms'] = $wpdb->prepare( "( component_name LIKE %s OR component_action LIKE %s )", $search_terms_like, $search_terms_like );
		}

		// The date query.
		if ( ! empty( $args['date_query'] ) ) {
			$where_conditions['date_query'] = self::get_date_query_sql( $args['date_query'] );
		}

		// The meta query.
		if ( ! empty( $meta_query_sql['where'] ) ) {
			$where_conditions['meta_query'] = $meta_query_sql['where'];
		}

		/**
		 * Filters the MySQL WHERE conditions for the Notifications items get method.
		 *
		 * @since 2.3.0
		 *
		 * @param array  $where_conditions Current conditions for MySQL WHERE statement.
		 * @param array  $args             Parsed arguments passed into method.
		 * @param string $select_sql       Current SELECT MySQL statement at point of execution.
		 * @param string $from_sql         Current FROM MySQL statement at point of execution.
		 * @param string $join_sql         Current INNER JOIN MySQL statement at point of execution.
		 * @param string $meta_query_sql   Current meta query WHERE statement at point of execution.
		 */
		$where_conditions = apply_filters( 'bp_notifications_get_where_conditions', $where_conditions, $args, $select_sql, $from_sql, $join_sql, $meta_query_sql );

		// Custom WHERE.
		if ( ! empty( $where_conditions ) ) {
			$where = 'WHERE ' . implode( ' AND ', $where_conditions );
		}

		return $where;
	}