ApiMessage.php

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<?php
interface IApiMessage extends MessageSpecifier {
    public function getApiCode();

    public function getApiData();

    public function setApiCode( $code, array $data = null );

    public function setApiData( array $data );
}

trait ApiMessageTrait {
    protected $apiCode = null;
    protected $apiData = [];

    public function getApiCode() {
        return $this->apiCode === null ? $this->getKey() : $this->apiCode;
    }

    public function setApiCode( $code, array $data = null ) {
        $this->apiCode = $code;
        if ( $data !== null ) {
            $this->setApiData( $data );
        }
    }

    public function getApiData() {
        return $this->apiData;
    }

    public function setApiData( array $data ) {
        $this->apiData = $data;
    }

    public function serialize() {
        return serialize( [
            'parent' => parent::serialize(),
            'apiCode' => $this->apiCode,
            'apiData' => $this->apiData,
        ] );
    }

    public function unserialize( $serialized ) {
        $data = unserialize( $serialized );
        parent::unserialize( $data['parent'] );
        $this->apiCode = $data['apiCode'];
        $this->apiData = $data['apiData'];
    }
}

class ApiMessage extends Message implements IApiMessage {
    use ApiMessageTrait;

    public static function create( $msg, $code = null, array $data = null ) {
        if ( $msg instanceof IApiMessage ) {
            return $msg;
        } elseif ( $msg instanceof RawMessage ) {
            return new ApiRawMessage( $msg, $code, $data );
        } else {
            return new ApiMessage( $msg, $code, $data );
        }
    }

    public function __construct( $msg, $code = null, array $data = null ) {
        if ( $msg instanceof Message ) {
            foreach ( get_class_vars( get_class( $this ) ) as $key => $value ) {
                if ( isset( $msg->$key ) ) {
                    $this->$key = $msg->$key;
                }
            }
        } elseif ( is_array( $msg ) ) {
            $key = array_shift( $msg );
            parent::__construct( $key, $msg );
        } else {
            parent::__construct( $msg );
        }
        $this->apiCode = $code;
        $this->apiData = (array)$data;
    }
}

class ApiRawMessage extends RawMessage implements IApiMessage {
    use ApiMessageTrait;

    public function __construct( $msg, $code = null, array $data = null ) {
        if ( $msg instanceof RawMessage ) {
            foreach ( get_class_vars( get_class( $this ) ) as $key => $value ) {
                if ( isset( $msg->$key ) ) {
                    $this->$key = $msg->$key;
                }
            }
        } elseif ( is_array( $msg ) ) {
            $key = array_shift( $msg );
            parent::__construct( $key, $msg );
        } else {
            parent::__construct( $msg );
        }
        $this->apiCode = $code;
        $this->apiData = (array)$data;
    }
}