<?php

/**
 * This file is part of the ramsey/collection library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
 * @license http://opensource.org/licenses/MIT MIT
 */

declare(strict_types=1);

namespace Ramsey\Collection;

use Ramsey\Collection\Exception\InvalidArgumentException;
use Ramsey\Collection\Exception\NoSuchElementException;
use Ramsey\Collection\Tool\TypeTrait;
use Ramsey\Collection\Tool\ValueToStringTrait;

/**
 * This class provides a basic implementation of `QueueInterface`, to minimize
 * the effort required to implement this interface.
 *
 * @template T
 * @extends AbstractArray<T>
 * @implements QueueInterface<T>
 */
class Queue extends AbstractArray implements QueueInterface
{
    use TypeTrait;
    use ValueToStringTrait;

    /**
     * The type of elements stored in this queue.
     *
     * A queue's type is immutable once it is set. For this reason, this
     * property is set private.
     */
    private string $queueType;

    /**
     * The index of the head of the queue.
     */
    protected int $index = 0;

    /**
     * Constructs a queue object of the specified type, optionally with the
     * specified data.
     *
     * @param string $queueType The type (FQCN) associated with this queue.
     * @param array<array-key, T> $data The initial items to store in the collection.
     */
    public function __construct(string $queueType, array $data = [])
    {
        $this->queueType = $queueType;
        parent::__construct($data);
    }

    /**
     * {@inheritDoc}
     *
     * Since arbitrary offsets may not be manipulated in a queue, this method
     * serves only to fulfill the `ArrayAccess` interface requirements. It is
     * invoked by other operations when adding values to the queue.
     *
     * @throws InvalidArgumentException if $value is of the wrong type
     */
    public function offsetSet($offset, $value): void
    {
        if ($this->checkType($this->getType(), $value) === false) {
            throw new InvalidArgumentException(
                'Value must be of type ' . $this->getType() . '; value is '
                . $this->toolValueToString($value),
            );
        }

        $this->data[] = $value;
    }

    /**
     * @throws InvalidArgumentException if $value is of the wrong type
     *
     * @inheritDoc
     */
    public function add($element): bool
    {
        $this[] = $element;

        return true;
    }

    /**
     * @inheritDoc
     */
    public function element()
    {
        $element = $this->peek();

        if ($element === null) {
            throw new NoSuchElementException(
                'Can\'t return element from Queue. Queue is empty.',
            );
        }

        return $element;
    }

    /**
     * @inheritDoc
     */
    public function offer($element): bool
    {
        try {
            return $this->add($element);
        } catch (InvalidArgumentException $e) {
            return false;
        }
    }

    /**
     * @inheritDoc
     */
    public function peek()
    {
        if ($this->count() === 0) {
            return null;
        }

        return $this[$this->index];
    }

    /**
     * @inheritDoc
     */
    public function poll()
    {
        if ($this->count() === 0) {
            return null;
        }

        $head = $this[$this->index];

        unset($this[$this->index]);
        $this->index++;

        return $head;
    }

    /**
     * @inheritDoc
     */
    public function remove()
    {
        $head = $this->poll();

        if ($head === null) {
            throw new NoSuchElementException('Can\'t return element from Queue. Queue is empty.');
        }

        return $head;
    }

    public function getType(): string
    {
        return $this->queueType;
    }
}

• [D] Exception
• [D] Map
• [D] Tool
• [F] AbstractArray.php
  Delete
• [F] AbstractCollection.php
  Delete
• [F] AbstractSet.php
  Delete
• [F] ArrayInterface.php
  Delete
• [F] Collection.php
  Delete
• [F] CollectionInterface.php
  Delete
• [F] DoubleEndedQueue.php
  Delete
• [F] DoubleEndedQueueInterface.php
  Delete
• [F] GenericArray.php
  Delete
• [F] Queue.php
  Delete
• [F] QueueInterface.php
  Delete
• [F] Set.php
  Delete

How To Payment

Simple Steps to Complete Your Payment Securely and Efficiently

Making a payment on our website is quick and secure. Start by logging in or creating an account. Select your preferred payment method, input the required details, and review the information. Once you confirm everything is correct, click on the "Submit Payment" button. You’ll receive instant confirmation and can track your payment status through your account dashboard. It’s an easy and secure process.

• Go to the Payment Section: Access the payment area on our website or app.
• Choose Your Payment Method: Select your preferred payment option.
• Enter Payment Details: Provide the necessary payment information.
• Verify Your Information: Check that all details are correct.
• Confirm Your Payment: Click "Submit Payment" to complete the transaction.