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<?php

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namespace Yoast\WP\SEO\Actions\Indexing;

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use wpdb;

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use Yoast\WP\SEO\Builders\Indexable_Link_Builder;

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use Yoast\WP\SEO\Helpers\Indexable_Helper;

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use Yoast\WP\SEO\Models\SEO_Links;

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use Yoast\WP\SEO\Repositories\Indexable_Repository;

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/**

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* Reindexing action for link indexables.

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abstract class Abstract_Link_Indexing_Action extends Abstract_Indexing_Action {

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/**

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* The link builder.

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* @var Indexable_Link_Builder

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protected $link_builder;

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/**

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* The indexable helper.

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* @var Indexable_Helper

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protected $indexable_helper;

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/**

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* The indexable repository.

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* @var Indexable_Repository

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protected $repository;

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/**

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* The WordPress database instance.

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* @var wpdb

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protected $wpdb;

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/**

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* Indexable_Post_Indexing_Action constructor

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* @param Indexable_Link_Builder $link_builder The indexable link builder.

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* @param Indexable_Helper $indexable_helper The indexable repository.

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* @param Indexable_Repository $repository The indexable repository.

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* @param wpdb $wpdb The WordPress database instance.

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public function __construct(

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Indexable_Link_Builder $link_builder,

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Indexable_Helper $indexable_helper,

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Indexable_Repository $repository,

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wpdb $wpdb

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) {

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$this->link_builder = $link_builder;

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$this->indexable_helper = $indexable_helper;

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$this->repository = $repository;

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$this->wpdb = $wpdb;

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}

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/**

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* Builds links for indexables which haven't had their links indexed yet.

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* @return SEO_Links[] The created SEO links.

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public function index() {

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$objects = $this->get_objects();

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$indexables = [];

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foreach ( $objects as $object ) {

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$indexable = $this->repository->find_by_id_and_type( $object->id, $object->type );

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if ( $indexable ) {

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$this->link_builder->build( $indexable, $object->content );

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$this->indexable_helper->save_indexable( $indexable );

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$indexables[] = $indexable;

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}

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}

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if ( \count( $indexables ) > 0 ) {

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\delete_transient( static::UNINDEXED_COUNT_TRANSIENT );

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\delete_transient( static::UNINDEXED_LIMITED_COUNT_TRANSIENT );

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}

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return $indexables;

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}

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/**

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* In the case of term-links and post-links we want to use the total unindexed count, because using

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* the limited unindexed count actually leads to worse performance.

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* @param int|bool $limit Unused.

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* @return int The total number of unindexed links.

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public function get_limited_unindexed_count( $limit = false ) {

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return $this->get_total_unindexed();

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}

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/**

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* Returns the number of texts that will be indexed in a single link indexing pass.

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* @return int The limit.

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public function get_limit() {

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/**

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* Filter 'wpseo_link_indexing_limit' - Allow filtering the number of texts indexed during each link indexing pass.

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* @param int $limit The maximum number of texts indexed.

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return \apply_filters( 'wpseo_link_indexing_limit', 5 );

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}

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/**

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* Returns objects to be indexed.

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* @return array Objects to be indexed, should be an array of objects with object_id, object_type and content.

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abstract protected function get_objects();

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}

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