<?php

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/**

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* Wraps an array (meta data for now) and tells if there was any changes.

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*

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* The main idea behind this class is to avoid doing unneeded

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* SQL updates if nothing changed.

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*

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* @version 3.2.0

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* @package WooCommerce

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*/

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defined( 'ABSPATH' ) || exit;

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/**

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* Meta data class.

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*/

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class WC_Meta_Data implements JsonSerializable {

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/**

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* Current data for metadata

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*

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* @since 3.2.0

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* @var array

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*/

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protected $current_data;

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/**

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* Metadata data

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*

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* @since 3.2.0

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* @var array

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*/

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protected $data;

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/**

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* Constructor.

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*

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* @param array $meta Data to wrap behind this function.

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*/

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public function __construct( $meta = array() ) {

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$this->current_data = $meta;

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$this->apply_changes();

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}

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/**

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* When converted to JSON.

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*

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* @return object|array

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*/

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#[\ReturnTypeWillChange]

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public function jsonSerialize() {

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return $this->get_data();

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}

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/**

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* Merge changes with data and clear.

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*/

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public function apply_changes() {

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$this->data = $this->current_data;

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}

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/**

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* Creates or updates a property in the metadata object.

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*

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* @param string $key Key to set.

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* @param mixed $value Value to set.

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*/

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public function __set( $key, $value ) {

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$this->current_data[ $key ] = $value;

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}

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/**

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* Checks if a given key exists in our data. This is called internally

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* by `empty` and `isset`.

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*

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* @param string $key Key to check if set.

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*

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* @return bool

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*/

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public function __isset( $key ) {

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return array_key_exists( $key, $this->current_data );

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}

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/**

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* Returns the value of any property.

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*

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* @param string $key Key to get.

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* @return mixed Property value or NULL if it does not exists

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*/

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public function __get( $key ) {

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if ( array_key_exists( $key, $this->current_data ) ) {

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return $this->current_data[ $key ];

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}

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return null;

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}

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/**

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* Return data changes only.

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*

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* @return array

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*/

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public function get_changes() {

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$changes = array();

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foreach ( $this->current_data as $id => $value ) {

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if ( ! array_key_exists( $id, $this->data ) || $value !== $this->data[ $id ] ) {

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$changes[ $id ] = $value;

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}

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}

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return $changes;

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}

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/**

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* Return all data as an array.

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*

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* @return array

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*/

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public function get_data() {

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return $this->data;

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}

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}

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