<?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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* Lazily open file stream for reading and close it when EOF is reached.

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*/

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class MWP_Stream_LazyFile 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 $stream = null;

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/**

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* @var mixed

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*/

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private $realPath;

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/**

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* @var bool

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*/

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private $initialized = false;

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public function __construct($realPath)

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{

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$this->realPath = $realPath;

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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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if ($this->stream !== null) {

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$this->stream->close();

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}

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}

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/**

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* {@inheritdoc}

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*/

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public function tell()

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{

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if (!$this->initialized) {

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return 0;

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}

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return $this->stream !== null ? $this->stream->tell() : false;

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}

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/**

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* {@inheritdoc}

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*/

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public function isSeekable()

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{

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$this->initialize();

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return $this->stream !== null ? $this->stream->isSeekable() : 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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$this->initialize();

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return $this->stream !== null ? $this->stream->seek($offset, $whence) : 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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$this->initialize();

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return $this->stream !== null ? $this->stream->eof() : true;

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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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$this->initialize();

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if ($this->stream === null) {

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return null;

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}

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$data = $this->stream->read($length);

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if ($this->eof()) {

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$this->close();

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}

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return $data;

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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 initialize()

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{

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if ($this->initialized === false) {

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if (file_exists($this->realPath)) {

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$handle = @fopen($this->realPath, "rb");

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if ($handle !== false) {

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$this->stream = MWP_Stream_Stream::factory($handle);

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}

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}

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$this->initialized = true;

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}

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}

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}

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