<?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) 2005-2010 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) 2005-2010 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;

    }

}