cx-newsletter/templates/13-builder.php

<?php

namespace cx_newsletter;

abstract class builder 
implements builder_interface {
    public function __construct() {
        $this->completed = false;
        $this->target = null;
    
        $this->prepare();
    }

    protected abstract function prepare() : void;
    
    protected function complete() : void {
        $this->completed = true;
    }

    public function get() : mixed {
        return $this->target;
    }

    public function is_complete() : bool {
        return $this->target !== null and $this->completed;
    }

    protected bool $completed;
    protected mixed $target;
}