halfpastfouram/collection

<?php

namespace Halfpastfour\Collection\Collection;

use Halfpastfour\Collection\ArraySerializableInterface;

/**
 * Class Immutable
 * @package Halfpastfour\Collection\Collection
 */
class Immutable implements ImmutableInterface, \IteratorAggregate, ArraySerializableInterface
{
    /**
     * The internal set of data.
     *
     * @var array
     */
    protected $data = [];

    /**
     * Mutable constructor.
     *
     * @param array|null $data
     */
    public function __construct( array $data = null )
    {
        if( !is_null( $data ) ) {
            $this->data = $data;
        }
    }

    /**
     * Should return an array containing all values.
     *
     * @return array
     */
    public function getArrayCopy()
    {
        return $this->data;
    }

    /**
     * Get (and create if not exists) an iterator.
     *
     * @return \ArrayIterator
     */
    public function getIterator()
    {
        return new \ArrayIterator( $this->data );
    }
}