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Edit File : Queue.php \| Size : 5.99 KB
<?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. / 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. * * @var string / private $queueType; /* * The index of the head of the queue. * * @var int / protected $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 mixed[] $data The initial items to store in the collection. / public function __construct(string $queueType, array $data = []) { $this->queueType = $queueType; parent::__construct($data); } /* * Sets the given value to the given offset in the queue. * * 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. * * @link http://php.net/manual/en/arrayaccess.offsetset.php ArrayAccess::offsetSet() * * @param mixed\|null $offset The offset is ignored and is treated as `null`. * @param mixed $value The value to set at the given offset. * * @throws InvalidArgumentException when the value does not match the * specified type for this queue. / public function offsetSet($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; } /* * Ensures that this queue contains the specified element. * * This method differs from `offer()` only in that it throws an exception if * it cannot add the element to the queue. * * @see self::offer() * * @param mixed $element The element to add to this queue. * * @return bool `true` if this queue changed as a result of the call. * * @throws InvalidArgumentException when the element does not match the * specified type for this queue. / public function add($element): bool { $this[] = $element; return true; } /* * Retrieves, but does not remove, the head of this queue. * * This method differs from `peek()` only in that it throws an exception if * this queue is empty. * * @see self::peek() * * @return mixed the head of this queue. * * @throws NoSuchElementException if this queue is empty. / public function element() { if ($this->count() === 0) { throw new NoSuchElementException( 'Can\'t return element from Queue. Queue is empty.' ); } return $this[$this->index]; } /* * Inserts the specified element into this queue. * * This method differs from `add()` only in that it does not throw an * exception if it cannot add the element to the queue. * * @see self::add() * * @param mixed $element The element to add to this queue. * * @return bool `true` if the element was added to this queue, else `false`. / public function offer($element): bool { try { return $this->add($element); } catch (InvalidArgumentException $e) { return false; } } /* * Retrieves, but does not remove, the head of this queue, or returns `null` * if this queue is empty. * * @see self::element() * * @return mixed\|null the head of this queue, or `null` if this queue is empty. / public function peek() { if ($this->count() === 0) { return null; } return $this[$this->index]; } /* * Retrieves and removes the head of this queue, or returns `null` * if this queue is empty. * * @see self::remove() * * @return mixed\|null the head of this queue, or `null` if this queue is empty. / public function poll() { if ($this->count() === 0) { return null; } $head = $this[$this->index]; unset($this[$this->index]); $this->index++; return $head; } /* * Retrieves and removes the head of this queue. * * This method differs from `poll()` only in that it throws an exception if * this queue is empty. * * @see self::poll() * * @return mixed the head of this queue. * * @throws NoSuchElementException if this queue is empty. / public function remove() { if ($this->count() === 0) { throw new NoSuchElementException('Can\'t return element from Queue. Queue is empty.'); } $head = $this[$this->index]; unset($this[$this->index]); $this->index++; return $head; } /* * Returns the type associated with this queue. */ public function getType(): string { return $this->queueType; } } Back

Edit File : Queue.php | Size : 5.99 KB

<?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.
 */
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.
     *
     * @var string
     */
    private $queueType;

/**
     * The index of the head of the queue.
     *
     * @var int
     */
    protected $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 mixed[] $data The initial items to store in the collection.
     */
    public function __construct(string $queueType, array $data = [])
    {
        $this->queueType = $queueType;
        parent::__construct($data);
    }

/**
     * Sets the given value to the given offset in the queue.
     *
     * 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.
     *
     * @link http://php.net/manual/en/arrayaccess.offsetset.php ArrayAccess::offsetSet()
     *
     * @param mixed|null $offset The offset is ignored and is treated as `null`.
     * @param mixed $value The value to set at the given offset.
     *
     * @throws InvalidArgumentException when the value does not match the
     *     specified type for this queue.
     */
    public function offsetSet($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;
    }

/**
     * Ensures that this queue contains the specified element.
     *
     * This method differs from `offer()` only in that it throws an exception if
     * it cannot add the element to the queue.
     *
     * @see self::offer()
     *
     * @param mixed $element The element to add to this queue.
     *
     * @return bool `true` if this queue changed as a result of the call.
     *
     * @throws InvalidArgumentException when the element does not match the
     *     specified type for this queue.
     */
    public function add($element): bool
    {
        $this[] = $element;

return true;
    }

/**
     * Retrieves, but does not remove, the head of this queue.
     *
     * This method differs from `peek()` only in that it throws an exception if
     * this queue is empty.
     *
     * @see self::peek()
     *
     * @return mixed the head of this queue.
     *
     * @throws NoSuchElementException if this queue is empty.
     */
    public function element()
    {
        if ($this->count() === 0) {
            throw new NoSuchElementException(
                'Can\'t return element from Queue. Queue is empty.'
            );
        }

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

/**
     * Inserts the specified element into this queue.
     *
     * This method differs from `add()` only in that it does not throw an
     * exception if it cannot add the element to the queue.
     *
     * @see self::add()
     *
     * @param mixed $element The element to add to this queue.
     *
     * @return bool `true` if the element was added to this queue, else `false`.
     */
    public function offer($element): bool
    {
        try {
            return $this->add($element);
        } catch (InvalidArgumentException $e) {
            return false;
        }
    }

/**
     * Retrieves, but does not remove, the head of this queue, or returns `null`
     * if this queue is empty.
     *
     * @see self::element()
     *
     * @return mixed|null the head of this queue, or `null` if this queue is empty.
     */
    public function peek()
    {
        if ($this->count() === 0) {
            return null;
        }

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

/**
     * Retrieves and removes the head of this queue, or returns `null`
     * if this queue is empty.
     *
     * @see self::remove()
     *
     * @return mixed|null the head of this queue, or `null` if this queue is empty.
     */
    public function poll()
    {
        if ($this->count() === 0) {
            return null;
        }

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

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

return $head;
    }

/**
     * Retrieves and removes the head of this queue.
     *
     * This method differs from `poll()` only in that it throws an exception if
     * this queue is empty.
     *
     * @see self::poll()
     *
     * @return mixed the head of this queue.
     *
     * @throws NoSuchElementException if this queue is empty.
     */
    public function remove()
    {
        if ($this->count() === 0) {
            throw new NoSuchElementException('Can\'t return element from Queue. Queue is empty.');
        }

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

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

return $head;
    }

/**
     * Returns the type associated with this queue.
     */
    public function getType(): string
    {
        return $this->queueType;
    }
}

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