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Editing: Key.php

<?php

namespace BitPayKeyUtils\KeyHelper;

use BitPayKeyUtils\Util\Point;

/**
 * Abstract object that is used for Public, Private, and SIN keys
 *
 * @package Bitcore
 */
abstract class Key extends Point implements KeyInterface
{
    /**
     * @var string
     */
    protected $hex;

/**
     * @var string
     */
    protected $dec;

/**
     * @var string
     */
    protected $id;

/**
     * @param string $id
     */
    public function __construct($id = null)
    {
        $this->id = $id;
    }

/**
     * Returns a new instance of self.
     *
     * @param string $id
     * @return KeyInterface
     */
    public static function create($id = null)
    {
        $class = get_called_class();

return new $class($id);
    }

/**
     * @return string
     */
    public function getId()
    {
        return $this->id;
    }

/**
     * @return string
     */
    public function getHex()
    {
        return $this->hex;
    }

/**
     * @return string
     */
    public function getDec()
    {
        return $this->dec;
    }

/**
     * @inheritdoc
     */
    public function serialize()
    {
        return serialize(
            array(
                $this->id,
                $this->x,
                $this->y,
                $this->hex,
                $this->dec,
            )
        );
    }

/**
     * @inheritdoc
     */
    public function unserialize($data)
    {
        list(
            $this->id,
            $this->x,
            $this->y,
            $this->hex,
            $this->dec
            ) = unserialize($data);
    }

/**
     * @return array
     */
    public function __serialize(): array
    {
        return [
            $this->id,
            $this->x,
            $this->y,
            $this->hex,
            $this->dec,
        ];
    }

/**
     * @param array $data
     */
    public function __unserialize(array $data): void
    {
        list(
            $this->id,
            $this->x,
            $this->y,
            $this->hex,
            $this->dec
            ) = $data;
    }

/**
     * @return boolean
     */
    public function isGenerated()
    {
        return (!empty($this->hex));
    }
}

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