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

DoubleEndedQueue.php in WCPOS – Point of Sale (POS) plugin for WooCommerce 1.10.13, at vendor/ramsey/collection/src/DoubleEndedQueue.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
20	/**
21	* This class provides a basic implementation of `DoubleEndedQueueInterface`, to
22	* minimize the effort required to implement this interface.
23	*
24	* @template T
25	* @extends Queue<T>
26	* @implements DoubleEndedQueueInterface<T>
27	*/
28	class DoubleEndedQueue extends Queue implements DoubleEndedQueueInterface
29	{
30	/**
31	* Index of the last element in the queue.
32	*/
33	private int $tail = -1;
34
35	/**
36	* @inheritDoc
37	*/
38	public function offsetSet($offset, $value): void
39	{
40	if ($this->checkType($this->getType(), $value) === false) {
41	throw new InvalidArgumentException(
42	'Value must be of type ' . $this->getType() . '; value is '
43	. $this->toolValueToString($value),
44	);
45	}
46
47	$this->tail++;
48
49	$this->data[$this->tail] = $value;
50	}
51
52	/**
53	* @throws InvalidArgumentException if $element is of the wrong type
54	*
55	* @inheritDoc
56	*/
57	public function addFirst($element): bool
58	{
59	if ($this->checkType($this->getType(), $element) === false) {
60	throw new InvalidArgumentException(
61	'Value must be of type ' . $this->getType() . '; value is '
62	. $this->toolValueToString($element),
63	);
64	}
65
66	$this->index--;
67
68	$this->data[$this->index] = $element;
69
70	return true;
71	}
72
73	/**
74	* @inheritDoc
75	*/
76	public function addLast($element): bool
77	{
78	return $this->add($element);
79	}
80
81	/**
82	* @inheritDoc
83	*/
84	public function offerFirst($element): bool
85	{
86	try {
87	return $this->addFirst($element);
88	} catch (InvalidArgumentException $e) {
89	return false;
90	}
91	}
92
93	/**
94	* @inheritDoc
95	*/
96	public function offerLast($element): bool
97	{
98	return $this->offer($element);
99	}
100
101	/**
102	* @inheritDoc
103	*/
104	public function removeFirst()
105	{
106	return $this->remove();
107	}
108
109	/**
110	* @inheritDoc
111	*/
112	public function removeLast()
113	{
114	$tail = $this->pollLast();
115
116	if ($tail === null) {
117	throw new NoSuchElementException('Can\'t return element from Queue. Queue is empty.');
118	}
119
120	return $tail;
121	}
122
123	/**
124	* @inheritDoc
125	*/
126	public function pollFirst()
127	{
128	return $this->poll();
129	}
130
131	/**
132	* @inheritDoc
133	*/
134	public function pollLast()
135	{
136	if ($this->count() === 0) {
137	return null;
138	}
139
140	$tail = $this[$this->tail];
141
142	unset($this[$this->tail]);
143	$this->tail--;
144
145	return $tail;
146	}
147
148	/**
149	* @inheritDoc
150	*/
151	public function firstElement()
152	{
153	return $this->element();
154	}
155
156	/**
157	* @inheritDoc
158	*/
159	public function lastElement()
160	{
161	if ($this->count() === 0) {
162	throw new NoSuchElementException('Can\'t return element from Queue. Queue is empty.');
163	}
164
165	return $this->data[$this->tail];
166	}
167
168	/**
169	* @inheritDoc
170	*/
171	public function peekFirst()
172	{
173	return $this->peek();
174	}
175
176	/**
177	* @inheritDoc
178	*/
179	public function peekLast()
180	{
181	if ($this->count() === 0) {
182	return null;
183	}
184
185	return $this->data[$this->tail];
186	}
187	}
188