woocommerce-pos / vendor / ramsey / collection / src / Queue.php

Queue.php in WCPOS – Point of Sale (POS) plugin for WooCommerce 1.10.13, at vendor/ramsey/collection/src/Queue.php

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1	<?php
2
3	/**
4	* This file is part of the ramsey/collection library
5	*
6	* For the full copyright and license information, please view the LICENSE
7	* file that was distributed with this source code.
8	*
9	* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
10	* @license http://opensource.org/licenses/MIT MIT
11	*/
12
13	declare(strict_types=1);
14
15	namespace Ramsey\Collection;
16
17	use Ramsey\Collection\Exception\InvalidArgumentException;
18	use Ramsey\Collection\Exception\NoSuchElementException;
19	use Ramsey\Collection\Tool\TypeTrait;
20	use Ramsey\Collection\Tool\ValueToStringTrait;
21
22	/**
23	* This class provides a basic implementation of `QueueInterface`, to minimize
24	* the effort required to implement this interface.
25	*
26	* @template T
27	* @extends AbstractArray<T>
28	* @implements QueueInterface<T>
29	*/
30	class Queue extends AbstractArray implements QueueInterface
31	{
32	use TypeTrait;
33	use ValueToStringTrait;
34
35	/**
36	* The type of elements stored in this queue.
37	*
38	* A queue's type is immutable once it is set. For this reason, this
39	* property is set private.
40	*/
41	private string $queueType;
42
43	/**
44	* The index of the head of the queue.
45	*/
46	protected int $index = 0;
47
48	/**
49	* Constructs a queue object of the specified type, optionally with the
50	* specified data.
51	*
52	* @param string $queueType The type (FQCN) associated with this queue.
53	* @param array<array-key, T> $data The initial items to store in the collection.
54	*/
55	public function __construct(string $queueType, array $data = [])
56	{
57	$this->queueType = $queueType;
58	parent::__construct($data);
59	}
60
61	/**
62	* {@inheritDoc}
63	*
64	* Since arbitrary offsets may not be manipulated in a queue, this method
65	* serves only to fulfill the `ArrayAccess` interface requirements. It is
66	* invoked by other operations when adding values to the queue.
67	*
68	* @throws InvalidArgumentException if $value is of the wrong type
69	*/
70	public function offsetSet($offset, $value): void
71	{
72	if ($this->checkType($this->getType(), $value) === false) {
73	throw new InvalidArgumentException(
74	'Value must be of type ' . $this->getType() . '; value is '
75	. $this->toolValueToString($value),
76	);
77	}
78
79	$this->data[] = $value;
80	}
81
82	/**
83	* @throws InvalidArgumentException if $value is of the wrong type
84	*
85	* @inheritDoc
86	*/
87	public function add($element): bool
88	{
89	$this[] = $element;
90
91	return true;
92	}
93
94	/**
95	* @inheritDoc
96	*/
97	public function element()
98	{
99	$element = $this->peek();
100
101	if ($element === null) {
102	throw new NoSuchElementException(
103	'Can\'t return element from Queue. Queue is empty.',
104	);
105	}
106
107	return $element;
108	}
109
110	/**
111	* @inheritDoc
112	*/
113	public function offer($element): bool
114	{
115	try {
116	return $this->add($element);
117	} catch (InvalidArgumentException $e) {
118	return false;
119	}
120	}
121
122	/**
123	* @inheritDoc
124	*/
125	public function peek()
126	{
127	if ($this->count() === 0) {
128	return null;
129	}
130
131	return $this[$this->index];
132	}
133
134	/**
135	* @inheritDoc
136	*/
137	public function poll()
138	{
139	if ($this->count() === 0) {
140	return null;
141	}
142
143	$head = $this[$this->index];
144
145	unset($this[$this->index]);
146	$this->index++;
147
148	return $head;
149	}
150
151	/**
152	* @inheritDoc
153	*/
154	public function remove()
155	{
156	$head = $this->poll();
157
158	if ($head === null) {
159	throw new NoSuchElementException('Can\'t return element from Queue. Queue is empty.');
160	}
161
162	return $head;
163	}
164
165	public function getType(): string
166	{
167	return $this->queueType;
168	}
169	}
170