<?php

namespace Guzzle\Stream;

/**
 * OO interface to PHP streams
 */
interface StreamInterface {

    /**
     * Convert the stream to a string if the stream is readable and the stream is seekable.
     *
     * @return string
     */
    public function __toString();

    /**
     * Close the underlying stream
     */
    public function close();

    /**
     * Get stream metadata
     *
     * @param string $key Specific metadata to retrieve
     *
     * @return array|mixed|null
     */
    public function getMetaData($key = null);

    /**
     * Get the stream resource
     *
     * @return resource
     */
    public function getStream();

    /**
     * Set the stream that is wrapped by the object
     *
     * @param resource $stream Stream resource to wrap
     * @param int      $size   Size of the stream in bytes. Only pass if the size cannot be obtained from the stream.
     *
     * @return self
     */
    public function setStream($stream, $size = null);

    /**
     * Detach the current stream resource
     *
     * @return self
     */
    public function detachStream();

    /**
     * Get the stream wrapper type
     *
     * @return string
     */
    public function getWrapper();

    /**
     * Wrapper specific data attached to this stream.
     *
     * @return array
     */
    public function getWrapperData();

    /**
     * Get a label describing the underlying implementation of the stream
     *
     * @return string
     */
    public function getStreamType();

    /**
     * Get the URI/filename associated with this stream
     *
     * @return string
     */
    public function getUri();

    /**
     * Get the size of the stream if able
     *
     * @return int|bool
     */
    public function getSize();

    /**
     * Check if the stream is readable
     *
     * @return bool
     */
    public function isReadable();

    /**
     * Check if the stream is repeatable
     *
     * @return bool
     */
    public function isRepeatable();

    /**
     * Check if the stream is writable
     *
     * @return bool
     */
    public function isWritable();

    /**
     * Check if the stream has been consumed
     *
     * @return bool
     */
    public function isConsumed();

    /**
     * Alias of isConsumed
     *
     * @return bool
     */
    public function feof();

    /**
     * Check if the stream is a local stream vs a remote stream
     *
     * @return bool
     */
    public function isLocal();

    /**
     * Check if the string is repeatable
     *
     * @return bool
     */
    public function isSeekable();

    /**
     * Specify the size of the stream in bytes
     *
     * @param int $size Size of the stream contents in bytes
     *
     * @return self
     */
    public function setSize($size);

    /**
     * Seek to a position in the stream
     *
     * @param int $offset Stream offset
     * @param int $whence Where the offset is applied
     *
     * @return bool Returns TRUE on success or FALSE on failure
     * @link   http://www.php.net/manual/en/function.fseek.php
     */
    public function seek($offset, $whence = SEEK_SET);

    /**
     * Read data from the stream
     *
     * @param int $length Up to length number of bytes read.
     *
     * @return string|bool Returns the data read from the stream or FALSE on failure or EOF
     */
    public function read($length);

    /**
     * Write data to the stream
     *
     * @param string $string The string that is to be written.
     *
     * @return int|bool Returns the number of bytes written to the stream on success or FALSE on failure.
     */
    public function write($string);

    /**
     * Returns the current position of the file read/write pointer
     *
     * @return int|bool Returns the position of the file pointer or false on error
     */
    public function ftell();

    /**
     * Rewind to the beginning of the stream
     *
     * @return bool Returns true on success or false on failure
     */
    public function rewind();

    /**
     * Read a line from the stream up to the maximum allowed buffer length
     *
     * @param int $maxLength Maximum buffer length
     *
     * @return string|bool
     */
    public function readLine($maxLength = null);

    /**
     * Set custom data on the stream
     *
     * @param string $key   Key to set
     * @param mixed  $value Value to set
     *
     * @return self
     */
    public function setCustomData($key, $value);

    /**
     * Get custom data from the stream
     *
     * @param string $key Key to retrieve
     *
     * @return null|mixed
     */
    public function getCustomData($key);
}
