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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Pdf
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id: Image.php 20096 2010-01-06 02:05:09Z bkarwin $
  */
 
 
 /** Internally used classes */
 // require_once 'Zend/Pdf/Element/Object.php';
 // require_once 'Zend/Pdf/Element/Dictionary.php';
 // require_once 'Zend/Pdf/Element/Name.php';
 // require_once 'Zend/Pdf/Element/Numeric.php';
 
 
 /** Zend_Pdf_Resource */
 // require_once 'Zend/Pdf/Resource.php';
 
 
 /**
  * Content stream (drawing instructions container)
  *
  * @package    Zend_Pdf
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Pdf_Resource_ContentStream extends Zend_Pdf_Resource
 {
     /**
      * Buffered content
      *
      * @var string
      */
     protected $_bufferedContent = '';
 
     /**
      * Object constructor.
      *
      * @param Zend_Pdf_Element_Object_Stream|string $contentStreamObject
      * @throws Zend_Pdf_Exception
      */
     public function __construct($contentStreamObject = '')
     {
         if ($contentStreamObject !== null &&
             !$contentStreamObject instanceof Zend_Pdf_Element_Object_Stream &&
             !is_string($contentStreamObject)
         ) {
             // require_once 'Zend/Pdf/Exception.php';
             throw new Zend_Pdf_Exception('Content stream parameter must be a string or stream object');
         }
 
         parent::__construct($contentStreamObject);
     }
 
     /**
      * Appends instructions to the end of the content stream
      *
      * @param string $instructions
      * @return Zend_Pdf_Resource_ContentStream
      */
     public function addInstructions($instructions)
     {
         $this->_bufferedContent .= $instructions;
         return $this;
     }
 
     /**
      * Get current stream content
      *
      * @return string
      */
     public function getInstructions()
     {
         $this->flush();
         return $this->_resource->value;
     }
 
     /**
      * Clear stream content.
      *
      * @return Zend_Pdf_Resource_ContentStream
      */
     public function clear()
     {
         $this->_resource->value = '';
         $this->_bufferedContent = '';
         return $this;
     }
 
     /**
      * Flush buffered content
      */
     public function flush()
     {
         $this->_resource->value .= $this->_bufferedContent;
         $this->_bufferedContent = '';
 
         return $this;
     }
 }