<?php

/* google_sitemap.class.php

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

-------------------------------------------------------------------------------
$Id: $

*/

/** A class for generating simple google sitemaps
 *@author Svetoslav Marinov <svetoslav.marinov@gmail.com>
 *@copyright 2005
 *@version 0.1
 *@access public
 *@package google_sitemap
 *@link http://devquickref.com
 */
class google_sitemap{
  var $header = "<\x3Fxml version=\"1.0\" encoding=\"UTF-8\"\x3F>\n\t<urlset xmlns=\"http://www.google.com/schemas/sitemap/0.84\">";
  var $charset = "UTF-8";
  var $footer = "\t</urlset>\n";
  var $items = array();

  /** Adds a new item to the channel contents.
   *@param google_sitemap item $new_item
   *@access public
   */
  function add_item($new_item){
    //Make sure $new_item is an 'google_sitemap item' object
    if(!is_a($new_item, "google_sitemap_item")){
      //Stop execution with an error message
      trigger_error("Can't add a non-google_sitemap_item object to the sitemap items array");
    }
    $this->items[] = $new_item;
  }

  /** Generates the sitemap XML data based on object properties.
   *@param string $file_name ( optional ) if file name is supplied the XML data is saved in it otherwise returned as a string.
   *@access public
   *@return [void|string]
   */
  function build( $file_name = null ){
    $map = $this->header . "\n";

    foreach($this->items as $item)
    {
		$item->loc = htmlentities($item->loc, ENT_QUOTES);
      $map .= "\t\t<url>\n\t\t\t<loc>$item->loc</loc>\n";

	  // lastmod
      if ( !empty( $item->lastmod ) )
      	$map .= "\t\t\t<lastmod>$item->lastmod</lastmod>\n";

	  // changefreq
      if ( !empty( $item->changefreq ) )
      	$map .= "\t\t\t<changefreq>$item->changefreq</changefreq>\n";

	  // priority
      if ( !empty( $item->priority ) )
      	$map .= "\t\t\t<priority>$item->priority</priority>\n";

      $map .= "\t\t</url>\n\n";
    }

    $map .= $this->footer . "\n";

    if(!is_null($file_name)){
      $fh = fopen($file_name, 'w');
      fwrite($fh, $map);
      fclose($fh);
    }else{
      return $map;
    }
  }

}

/** A class for storing google_sitemap items and will be added to google_sitemap objects.
 *@author Svetoslav Marinov <svetoslav.marinov@gmail.com>
 *@copyright 2005
 *@access public
 *@package google_sitemap_item
 *@link http://devquickref.com
 *@version 0.1
*/
class google_sitemap_item{
  /** Assigns constructor parameters to their corresponding object properties.
   *@access public
   *@param string $loc location
   *@param string $lastmod date (optional) format in YYYY-MM-DD or in "ISO 8601" format
   *@param string $changefreq (optional)( always,hourly,daily,weekly,monthly,yearly,never )
   *@param string $priority (optional) current link's priority ( 0.0-1.0 )
   */
  function google_sitemap_item( $loc, $lastmod = '', $changefreq = '', $priority = '' ){
    $this->loc = $loc;
    $this->lastmod = $lastmod;
    $this->changefreq = $changefreq;
    $this->priority = $priority;
  }
}

?>