WC_Query demo implementation

wc-query-demo.php

<?php

/**
 * First draft of the WooCommerce CRUD search helpers.
 */

/**
 * Base query class intended for extending.
 */
class WC_Object_Query {

	public $query_vars = array();

	public function __construct( $args = array() ) {
		$this->query_vars = wp_parse_args( $args, $this->get_default_query_vars() );
	}

	/**
	 * Get a query var.
	 */
	public function get( $query_var, $default ) {
		if ( isset( $this->query_vars[ $query_var ] ) ) {
			return $this->query_vars[ $query_var ];
		}
		return $default;
	}

	/**
	 * Set a query var.
	 */
	public function set( $query_var, $value ) {
		$this->query_vars[$query_var] = $value;
	}

	/**
	 * Get all of the defaults for a query.
	 */
	protected function get_default_query_vars() {
		return array(
			'status'     => array( 'draft', 'pending', 'private', 'publish' ),
			'meta_query' => array(),
			's'          => '',
			//           etc.
		);
	}
}

/**
 * Product queries.
 */
class WC_Product_Query extends WC_Query {
	
	/**
	 * Add product-specific query defaults.
	 */
	protected function get_default_query_vars() {
		return array_merge(
			parent::get_default_query_vars(),
			array(
				'status'       => array( 'draft', 'pending', 'private', 'publish' ),
				'type'         => array_merge( array_keys( wc_get_product_types() ) ),
				'weight'       => '',
				'downloadable' => ''
				//             etc.
			)
		);
	}

	/**
	 * Turning the query args into Product objects is left to the data store.
	 * @return array of WC_Product objects
	 */
	public function get_products() {
		return WC_Data_Store::load( 'product' )->get_products( $this->query_vars );
	}
}

/**
 * Order queries.
 */
class WC_Order_Query extends WC_Object_Query {
	
	/**
	 * Add order-specific query defaults.
	 */
	protected function get_default_query_vars() {
		return array_merge(
			parent::get_default_query_vars(),
			array(
				'status'      => array_keys( wc_get_order_statuses() ),
				'type'        => wc_get_order_types( 'view-orders' ),
				//            etc.
			)
		);
	}

	/**
	 * Turning the query args into Order objects is left to the data store.
	 * @return array of WC_Order objects
	 */
	public function get_orders() {
		return WC_Data_Store::load( 'order' )->get_orders( $this->query_vars );
	}
}

class WC_Product_Query extends WC_Object_Query*