Code Coverage for /src/src/BNodeLabeler.php

1	<?php
2
3	namespace Wikimedia\Purtle;
4
5	use InvalidArgumentException;
6
7	/**
8	* Helper class for generating labels for blank nodes.
9	*
10	* This serves as a holder for the bnode counter that can be shared between multiple RdfWriter
11	* instances, to avoid conflicting ids.
12	*
13	* @license GPL-2.0-or-later
14	* @author Daniel Kinzler
15	*/
16	class BNodeLabeler {
17
18	/**
19	* @var string
20	*/
21	private $prefix;
22
23	/**
24	* @var int
25	*/
26	private $counter;
27
28	/**
29	* @param string $prefix
30	* @param int $start
31	*
32	* @throws InvalidArgumentException
33	*/
34	public function __construct( $prefix = 'genid', $start = 1 ) {
35	if ( !is_string( $prefix ) ) {
36	throw new InvalidArgumentException( '$prefix must be a string' );
37	}
38
39	if ( !is_int( $start ) \|\| $start < 1 ) {
40	throw new InvalidArgumentException( '$start must be an int >= 1' );
41	}
42
43	$this->prefix = $prefix;
44	$this->counter = $start;
45	}
46
47	/**
48	* @param string\|null $label node label; will be generated if not given.
49	*
50	* @return string
51	*/
52	public function getLabel( $label = null ) {
53	if ( $label === null ) {
54	$label = $this->prefix . $this->counter;
55	$this->counter++;
56	}
57
58	return $label;
59	}
60
61	}