<?php

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/*

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* This file is part of the ManageWP Worker plugin.

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*

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* (c) ManageWP LLC <contact@managewp.com>

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*

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* For the full copyright and license information, please view the LICENSE

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* file that was distributed with this source code.

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*/

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/**

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* Append stream.

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*/

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class MWP_Stream_Append implements MWP_Stream_Interface

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{

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/**

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* @var MWP_Stream_Interface[]

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*/

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private $streams = array();

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private $current = 0;

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/**

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* Add a stream to the AppendStream

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*

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* @param MWP_Stream_Interface $stream Stream to append. Must be readable.

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*/

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public function addStream(MWP_Stream_Interface $stream)

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{

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$this->streams[] = $stream;

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}

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/**

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* @return bool

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*/

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public function isSeekable()

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{

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return false;

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}

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/**

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* {@inheritdoc}

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*/

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public function seek($offset, $whence = SEEK_SET)

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{

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return false;

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}

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/**

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* {@inheritdoc}

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*/

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public function eof()

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{

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return $this->isAtLastStream() && $this->getCurrentStream()->eof();

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}

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/**

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* {@inheritdoc}

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*/

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public function read($length)

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{

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$data = '';

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while (!$this->eof()) {

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while ($this->getCurrentStream()->eof() && !$this->eof()) {

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$this->moveToNextStream();

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}

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$currentStreamData = $this->getCurrentStream()->read($length);

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$data .= $currentStreamData;

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$length -= strlen($currentStreamData);

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if ($length <= 0) {

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break;

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}

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}

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return $data;

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}

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/**

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* {@inheritdoc}

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*/

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public function close()

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{

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foreach ($this->streams as $stream) {

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$stream->close();

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}

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}

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/**

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* Tell is not supported.

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*/

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public function tell()

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{

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return false;

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}

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public function __toString()

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{

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$buffer = '';

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while (!$this->eof()) {

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$buffer .= $this->read(1048576);

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}

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return $buffer;

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}

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private function moveToNextStream()

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{

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if ($this->current >= count($this->streams)) {

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return false;

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}

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$this->current++;

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return true;

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}

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private function isAtLastStream()

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{

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return $this->current === count($this->streams) - 1;

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}

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private function getCurrentStream()

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{

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return $this->streams[$this->current];

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}

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}

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