<?php

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namespace GuzzleHttp\Psr7;

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use Psr\Http\Message\StreamInterface;

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/**

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* Lazily reads or writes to a file that is opened only after an IO operation

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* take place on the stream.

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*

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* @final

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*/

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class LazyOpenStream implements StreamInterface

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{

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use StreamDecoratorTrait;

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/** @var string File to open */

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private $filename;

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/** @var string */

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private $mode;

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/**

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* @param string $filename File to lazily open

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* @param string $mode fopen mode to use when opening the stream

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*/

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public function __construct($filename, $mode)

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{

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$this->filename = $filename;

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$this->mode = $mode;

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}

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/**

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* Creates the underlying stream lazily when required.

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*

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* @return StreamInterface

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*/

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protected function createStream()

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{

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return Utils::streamFor(Utils::tryFopen($this->filename, $this->mode));

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}

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}

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