StringInputStream.class.php

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00001 <?php
00002 /***************************************************************************
00003  *   Copyright (C) 2007 by Ivan Y. Khvostishkov                            *
00004  *                                                                         *
00005  *   This program is free software; you can redistribute it and/or modify  *
00006  *   it under the terms of the GNU Lesser General Public License as        *
00007  *   published by the Free Software Foundation; either version 3 of the    *
00008  *   License, or (at your option) any later version.                       *
00009  *                                                                         *
00010  ***************************************************************************/
00011 
00015     final class StringInputStream extends InputStream
00016     {
00017         private $string     = null;
00018         private $length     = null;
00019         
00020         private $position   = 0;
00021         private $mark       = 0;
00022         
00023         public function __construct($string)
00024         {
00025             Assert::isString($string);
00026             
00027             $this->string = $string;
00028             $this->length = strlen($string);
00029         }
00030         
00034         public static function create($string)
00035         {
00036             return new self($string);
00037         }
00038         
00039         public function isEof()
00040         {
00041             return ($this->position >= $this->length);
00042         }
00043         
00047         public function mark()
00048         {
00049             $this->mark = $this->position;
00050             
00051             return $this;
00052         }
00053         
00054         public function markSupported()
00055         {
00056             return true;
00057         }
00058         
00062         public function reset()
00063         {
00064             $this->position = $this->mark;
00065             
00066             return $this;
00067         }
00068         
00072         public function close()
00073         {
00074             $this->string = null;
00075             
00076             return $this;
00077         }
00078         
00079         public function read($count)
00080         {
00081             if (!$this->string || $this->isEof())
00082                 return null;
00083             
00084             if ($count == 1) {
00085                 $result = $this->string[$this->position];
00086             } else {
00087                 $result = substr($this->string, $this->position, $count);
00088             }
00089             
00090             $this->position += $count;
00091             
00092             return $result;
00093         }
00094     }
00095 ?>