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Filename : OneChildDuplicateNode.php

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<?php
/**
 * @copyright 2013 Matthew Nagi
 * @license http://opensource.org/licenses/BSD-2-Clause BSD 2-Clause License
 */

namespace Pleo\Merkle;

/**
 * Acts like a TwoChildrenNode but accepts one data item and duplicates it
 */
class OneChildDuplicateNode implements ITreeNode
{
    /**
     * @var TwoChildrenNode
     */
    private $node;

    /**
     * @param TwoChildrenNode $node
     */
    public function __construct(TwoChildrenNode $node)
    {
        $this->node = $node;
    }

    /**
     * @throws UnexpectedValueException
     * @return string|null
     */
    public function hash()
    {
        return $this->node->hash();
    }

    /**
     * @param string|ITreeNode $data
     * @throws LogicException
     * @throws InvalidArgumentException
     * @return null
     */
    public function data($data)
    {
        return $this->node->data($data, $data);
    }
}