Singleton
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Sample code, tutorial

Sådan benyttes komponenten Singleton klassen

Først skal du inkludere den fil der beskriver komponenten, som en klasse fil

  • <?
    require_once(HTML_PACKAGE_PATH.'/Singleton.php');
    ?>

Dernæst kan du enten benytte komponenten som et taglib (statiske metoder):

  • <?
    Singleton    ::display($param1, $param2, $param3, ...);
    ?>

eller du kan lave en instance af komponenten og benytte metoderne direkte:

  • <?
    $object     = new Singleton($param1, $param2, $param3, ...);
    print     $object->getHtml();
    ?>

Parent html

Sådan vises komponenten Singleton klassen

PHP source code

Den fulde PHP kildekode for Singleton klassen

<?
/**
* @package basic
* @see HTML_BASIC_UTIL_PATH.'/Singleton.php'
* @copyright (c) http://Finn-Rasmussen.com
* @license http://Finn-Rasmussen.com/license/ myPHP License conditions
* @author http://Finn-Rasmussen.com
* @version 1.10
* @since 22-feb-2007
*/

/**
* The required files
*/
if (defined('HTML_LOG_UTIL_PATH')) {
    require_once(HTML_LOG_UTIL_PATH.'/Log.php');
}

/**
* The Singleton Factory class used in the myPHP
* <code>
* Usage:
*   $instance = & Singleton::getInstance($class,$id);
* Or
*   Singleton::getInstance(); // Dump all singleton classes
* </code>
* @package basic
*/
class Singleton {
    /**
     * Constructor
     * @private
     */
    function Singleton() {
    }
    
    /**
     * Get an instance of the specified class
     * The singleton pattern is applied
     * It requires that the class definition be pre-loaded as require_once.
     * If the file name could be deduced or constructed from the class name
     * then it could be built into the getInstance() method.
     * Return all the singleton classes, if no class and id is specified
     * @param  String $class The name of the class
     * @param  String $id Adding an optional ID allows holding more than one object a class. Assigned ID will distinguish array keys.
     * @return Object The one and only single instance of the object
     */
    function & getInstance($class='',$id='') {
        /**
         * array of instance names
         */
        static $instances = array ();
        $key = $class.$id;
        if ($key!='') {
            if (array_key_exists($key, $instances)) {
                // Ok exists
            } else {
                // instance does not exist, so create it
                $instances[$key] = new $class();
            }
            $instance = & $instances[$key];
            return $instance;
        } else {
            /**
             * Dump all the singleton classes
             * Debug only
             */
            if (defined('DEBUG_LEVEL') && DEBUG_LEVEL & DEBUG_LEVEL_SHOW_CLASS) {
                $html = "<fieldset><legend>print Singleton::getInstance()</legend>\r\n";
                 foreach ($instances as $key=>$value) {
                     $html .= "$key (key)=".ucfirst(get_class($value))."<br />\r\n";
                 }
                 $html .= "</fieldset>\r\n";
                 return $html;
            } else {
                // Ignore
                 return null;
            }
        }
    }
    
    /**
     * Get the html code
     * @return String The html code
     */
    function getHtml() {
        return Singleton::getInstance();
    }
}
?>

HTML source code

Den fulde HTML kildekode for Singleton klassen

<?

?>

Class methods

Her er 'klasse metoderne' for Singleton klassen:

  • singleton
  • getinstance
  • gethtml

Object vars

Her er 'objekt variable' for Singleton klassen:
Singleton

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Singleton