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Editing: MessageCollection.php

<?php

namespace Protobuf;

use InvalidArgumentException;
use ArrayObject;

/**
 * Message collection
 *
 * @author Fabio B. Silva <fabio.bat.silva@gmail.com>
 */
class MessageCollection extends ArrayObject implements Collection
{
    /**
     * @param array<\Protobuf\Message> $values
     */
    public function __construct(array $values = [])
    {
        array_walk($values, [$this, 'add']);
    }

/**
     * Adds a message to this collection
     *
     * @param \Protobuf\Message $message
     */
    public function add(Message $message)
    {
        parent::offsetSet(null, $message);
    }

/**
     * {@inheritdoc}
     */
    public function offsetSet($offset, $value)
    {
        if ( ! $value instanceof Message) {
            throw new InvalidArgumentException(sprintf(
                'Argument 2 passed to %s must implement interface \Protobuf\Message, %s given',
                __METHOD__,
                is_object($value) ? get_class($value) : gettype($value)
            ));
        }

parent::offsetSet($offset, $value);
    }
}

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