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<?php
/**
* Abstract class for accessing a specific field value.
*
* It works with the raw value and performs no validation or sanitization whatsoever. The actual behaviour depends on
* the actual implementation, but it is safe to assume get_*_meta (& co.) functions will be used.
*/
abstract class WPCF_Field_Accessor_Abstract {
/** @var int */
protected $object_id;
/** @var string */
protected $meta_key;
/** @var bool */
protected $is_single;
/**
* WPCF_Field_Accessor_Abstract constructor.
*
* @param int $object_id ID of the object to which the field belongs.
* @param string $meta_key Meta key used to store field value.
* @param bool $is_repetitive
*/
public function __construct( $object_id, $meta_key, $is_repetitive = false ) {
$this->object_id = $object_id;
$this->meta_key = $meta_key;
$this->is_single = (bool) !$is_repetitive;
}
/**
* @return mixed Field value from the database.
*/
public abstract function get_raw_value();
/**
* @param mixed $value New value to be saved to the database.
* @param mixed $prev_value Previous field value. Use if updating an item in a repetitive field.
* @return mixed
*/
public abstract function update_raw_value( $value, $prev_value = '' );
/**
* Add new metadata. Note that if the accessor is set up for a repetitive field, the is_unique argument
* of add_*_meta should be false and otherwise it should be true.
*
* @link https://developer.wordpress.org/reference/functions/add_term_meta/
*
* @param mixed $value New value to be saved to the database
* @return mixed
*/
public abstract function add_raw_value( $value );
/**
* @return bool True, if the value is not empty.
*/
public function has_raw_value() {
$has_raw_value = $this->get_raw_value();
$has_raw_value = ! empty( $has_raw_value )
? true
: false;
return $has_raw_value;
}
/**
* Delete field value from the database.
*
* @param string $value Specific value to be deleted. Use if deleting an item in a repetitive field.
* @return mixed
*/
public abstract function delete_raw_value( $value = '' );
}