Post_Object.php

<?php

namespace Tribe\Libs\Post_Type;

use Tribe\Libs\Object_Meta\Meta_Map;
use Tribe\Libs\Object_Meta\Meta_Repository;

/**
 * Class Post_Object
 *
 * Extend this class for each registered post type.
 * Be sure to set a value for the NAME constant in
 * each subclass.
 *
 * For most not-test usage, instances of this class
 * will be created via the `factory()` method called
 * on the subclasses.
 *
 * Instances can be used to access meta registered by
 * an appropriate Meta_Group, via the `get_meta()` method
 * called with a registered key.
 */
class Post_Object {
	public const NAME = '';

	/** @var Meta_Map */
	protected $meta;

	protected $post_id = 0;

	/**
	 * Post_Object constructor.
	 *
	 * @param int           $post_id        The ID of a WP post
	 * @param Meta_Map|null $meta           Meta fields appropriate to this post type.
	 *                                      If you're not sure what to do here, chances
	 *                                      are you should be calling self::get_post().
	 */
	public function __construct( $post_id = 0, Meta_Map $meta = null ) {
		$this->post_id = $post_id;
		if ( isset( $meta ) ) {
			$this->meta = $meta;
		} else {
			$this->meta = new Meta_Map( static::NAME );
		}
	}

	public function __get( $key ) {
		return $this->get_meta( $key );
	}

	/**
	 * Get the value for the given meta key corresponding
	 * to this post.
	 *
	 * @param string $key
	 * @return mixed
	 */
	public function get_meta( $key ) {
		return $this->meta->get_value( $this->post_id, $key );
	}

	/**
	 * Get an instance of the Post_Object corresponding
	 * to the \WP_Post with the given $post_id
	 *
	 * @param int $post_id The ID of an existing post
	 * @return static
	 */
	public static function factory( $post_id ) {
		/** @var Meta_Repository|null $meta_repo */
		$meta_repo = apply_filters( Meta_Repository::GET_REPO_FILTER, null );

		if ( empty( $meta_repo ) ) {
			$meta_repo = new Meta_Repository();
		}

		$post_type = static::NAME;

		if ( empty( $post_type ) ) {
			$post_type = get_post_type( $post_id );
		}

		return new static( $post_id, $meta_repo->get( $post_type ) );
	}
}