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<?php
/**
* This file is part of FPDI
*
* @package setasign\Fpdi
* @copyright Copyright (c) 2020 Setasign GmbH & Co. KG (https://www.setasign.com)
* @license http://opensource.org/licenses/mit-license The MIT License
*/
namespace setasign\Fpdi\PdfParser\Type;
use setasign\Fpdi\PdfParser\CrossReference\CrossReferenceException;
use setasign\Fpdi\PdfParser\PdfParser;
use setasign\Fpdi\PdfParser\PdfParserException;
/**
* A class defining a PDF data type
*/
class PdfType
{
/**
* Resolves a PdfType value to its value.
*
* This method is used to evaluate indirect and direct object references until a final value is reached.
*
* @param PdfType $value
* @param PdfParser $parser
* @param bool $stopAtIndirectObject
* @return PdfType
* @throws CrossReferenceException
* @throws PdfParserException
*/
public static function resolve(PdfType $value, PdfParser $parser, $stopAtIndirectObject = false)
{
if ($value instanceof PdfIndirectObject) {
if ($stopAtIndirectObject === true) {
return $value;
}
return self::resolve($value->value, $parser, $stopAtIndirectObject);
}
if ($value instanceof PdfIndirectObjectReference) {
return self::resolve($parser->getIndirectObject($value->value), $parser, $stopAtIndirectObject);
}
return $value;
}
/**
* Ensure that a value is an instance of a specific PDF type.
*
* @param string $type
* @param PdfType $value
* @param string $errorMessage
* @return mixed
* @throws PdfTypeException
*/
protected static function ensureType($type, $value, $errorMessage)
{
if (!($value instanceof $type)) {
throw new PdfTypeException(
$errorMessage,
PdfTypeException::INVALID_DATA_TYPE
);
}
return $value;
}
/**
* The value of the PDF type.
*
* @var mixed
*/
public $value;
}
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