Slick\Http\Message\Stream\AbstractStream

Complexity

Total Complexity

44

Size/Duplication

Total Lines	304
Duplicated Lines	0 %

Importance

Changes	2
Bugs	0	Features	0

16 Methods

Rating	Name	Duplication	Size	Complexity
A	isReadable()	0	8	3
A	__destruct()	0	3	1
A	read()	0	13	4
A	getContents()	0	10	3
A	isWritable()	0	13	6
A	isSeekable()	0	8	2
A	write()	0	13	4
A	getMetadata()	0	10	3
A	close()	0	4	2
A	eof()	0	7	2
A	seek()	0	13	4
A	rewind()	0	3	1
A	detach()	0	5	1
A	__toString()	0	12	3
A	tell()	0	14	3
A	getSize()	0	8	2

<?php

/**
 * This file is part of slick/http
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Slick\Http\Message\Stream;

use Psr\Http\Message\StreamInterface;
use Slick\Http\Message\Exception\RuntimeException;

/**
 * Class AbstractStream
 * @package Slick\Http\Message\Stream
 */
abstract class AbstractStream implements StreamInterface
{

    /**
     * @var resource
     */
    protected $stream;

    /**
     * Reads all data from the stream into a string, from the beginning to end.
     *
     * This method MUST attempt to seek to the beginning of the stream before
     * reading data and read the stream until the end is reached.
     *
     * Warning: This could attempt to load a large amount of data into memory.
     *
     * This method MUST NOT raise an exception in order to conform with PHP's
     * string casting operations.
     *
     * @see http://php.net/manual/en/language.oop5.magic.php#object.tostring
     * @return string
     */
    public function __toString()
    {
        if (!$this->isReadable()) {
            return '';
        }
        $value = '';
        try {
            $this->rewind();
            $value = $this->getContents();
        } catch (\RuntimeException $e) {

Consider adding a comment why this CATCH block is empty.

        }
        return $value;
    }

    /**
     * Closes the stream and any underlying resources.
     *
     * @return void
     */
    public function close()
    {
        if (is_resource($this->stream)) {
            fclose($this->stream);
        }
    }

    /**
     * Separates any underlying resources from the stream.
     *
     * After the stream has been detached, the stream is in an unusable state.
     *
     * @return resource|null Underlying PHP stream, if any
     */
    public function detach()
    {
        $resource = $this->stream;
        $this->stream = null;
        return $resource;
    }

    /**
     * Get the size of the stream if known.
     *
     * @return int|null Returns the size in bytes if known, or null if unknown.
     */
    public function getSize()
    {
        if (is_null($this->stream)) {

The condition is_null($this->stream) is always false.

            return null;
        }

        $stats = fstat($this->stream);
        return $stats['size'];
    }

    /**
     * Returns the current position of the file read/write pointer
     *
     * @return int Position of the file pointer
     * @throws RuntimeException on error.
     */
    public function tell()
    {
        if (!$this->stream) {
            throw new RuntimeException(
                'No resource available; cannot tell position'
            );
        }
        $result = ftell($this->stream);
        if (!is_int($result)) {

The condition is_int($result) is always true.

            throw new RuntimeException(
                'Error occurred during tell operation'
            );
        }
        return $result;
    }

    /**
     * Returns true if the stream is at the end of the stream.
     *
     * @return bool
     */
    public function eof()
    {
        $return = true;
        if (is_resource($this->stream)) {
            $return = feof($this->stream);
        }
        return $return;
    }

    /**
     * Returns whether or not the stream is seekable.
     *
     * @return bool
     */
    public function isSeekable()
    {
        $seekable = false;
        if ($this->stream) {
            $meta = stream_get_meta_data($this->stream);
            $seekable = $meta['seekable'];
        }
        return $seekable;
    }

    /**
     * Seek to a position in the stream.
     *
     * @link http://www.php.net/manual/en/function.fseek.php
     * @param int $offset Stream offset
     * @param int $whence Specifies how the cursor position will be calculated
     *     based on the seek offset. Valid values are identical to the built-in
     *     PHP $whence values for `fseek()`.  SEEK_SET: Set position equal to
     *     offset bytes SEEK_CUR: Set position to current location plus offset
     *     SEEK_END: Set position to end-of-stream plus offset.
     * @throws RuntimeException on failure.
     *
     * @return bool
     */
    public function seek($offset, $whence = SEEK_SET)
    {
        if (! $this->stream) {
            throw new RuntimeException('No resource available; cannot seek position');
        }
        if (! $this->isSeekable()) {
            throw new RuntimeException('Stream is not seekable');
        }
        $result = fseek($this->stream, $offset, $whence);
        if (0 !== $result) {
            throw new RuntimeException('Error seeking within stream');
        }
        return true;
    }

    /**
     * Seek to the beginning of the stream.
     *
     * If the stream is not seekable, this method will raise an exception;
     * otherwise, it will perform a seek(0).
     *
     * @see seek()
     * @link http://www.php.net/manual/en/function.fseek.php
     * @throws \RuntimeException on failure.
     */
    public function rewind()
    {
        return $this->seek(0);
    }

    /**
     * Returns whether or not the stream is writable.
     *
     * @return bool
     */
    public function isWritable()
    {
        if (! $this->stream) {
            return false;
        }
        $meta = stream_get_meta_data($this->stream);
        $mode = $meta['mode'];
        return (
            strstr($mode, 'x')
            || strstr($mode, 'w')
            || strstr($mode, 'c')
            || strstr($mode, 'a')
            || strstr($mode, '+')
        );
    }

    /**
     * Write data to the stream.
     *
     * @param string $string The string that is to be written.
     * @return int Returns the number of bytes written to the stream.
     * @throws RuntimeException on failure.
     */
    public function write($string)
    {
        if (! $this->stream) {
            throw new RuntimeException('No resource available; cannot write');
        }
        if (! $this->isWritable()) {
            throw new RuntimeException('Stream is not writable');
        }
        $result = fwrite($this->stream, $string);
        if (false === $result) {
            throw new RuntimeException('Error writing to stream');
        }
        return $result;
    }

    /**
     * Returns whether or not the stream is readable.
     *
     * @return bool
     */
    public function isReadable()
    {
        if (! $this->stream) {
            return false;
        }
        $meta = stream_get_meta_data($this->stream);
        $mode = $meta['mode'];
        return (strstr($mode, 'r') || strstr($mode, '+'));
    }

    /**
     * Read data from the stream.
     *
     * @param int $length Read up to $length bytes from the object and return
     *     them. Fewer than $length bytes may be returned if underlying stream
     *     call returns fewer bytes.
     * @return string Returns the data read from the stream, or an empty string
     *     if no bytes are available.
     * @throws RuntimeException if an error occurs.
     */
    public function read($length)
    {
        if (! $this->stream) {
            throw new RuntimeException('No resource available; cannot read');
        }
        if (! $this->isReadable()) {
            throw new RuntimeException('Stream is not readable');
        }
        $result = fread($this->stream, $length);
        if (false === $result) {
            throw new RuntimeException('Error reading stream');
        }
        return $result;
    }

    /**
     * Returns the remaining contents in a string
     *
     * @return string
     * @throws RuntimeException if unable to read or an error occurs while
     *     reading.
     */
    public function getContents()
    {
        if (! $this->isReadable()) {
            throw new RuntimeException('Stream is not readable');
        }
        $result = stream_get_contents($this->stream);
        if (false === $result) {
            throw new RuntimeException('Error reading from stream');
        }
        return $result;
    }

    /**
     * Get stream metadata as an associative array or retrieve a specific key.
     *
     * The keys returned are identical to the keys returned from PHP's
     * stream_get_meta_data() function.
     *
     * @link http://php.net/manual/en/function.stream-get-meta-data.php
     * @param string $key Specific metadata to retrieve.
     * @return array|mixed|null Returns an associative array if no key is
     *     provided. Returns a specific key value if a key is provided and the
     *     value is found, or null if the key is not found.
     */
    public function getMetadata($key = null)
    {
        if (null === $key) {
            return stream_get_meta_data($this->stream);
        }
        $metadata = stream_get_meta_data($this->stream);
        if (! array_key_exists($key, $metadata)) {
            return null;
        }
        return $metadata[$key];
    }

    /**
     * Closes the stream on destroy
     */
    public function __destruct()
    {
        $this->close();
    }
}