<?php
/*
EasyGUI XP is free software released under the terms of the following BSD license.

Copyright (c) 2005,2006 Gaetan Lauff (glauff@plansoft.de)
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

- Redistributions of source code must retain the above copyright notice, 
this list of conditions and the following disclaimer. 

- Redistributions in binary form must reproduce the above copyright notice, 
this list of conditions and the following disclaimer in the documentation 
and/or other materials provided with the distribution.

- Neither the name of the developer nor the names of its contributors may 
be used to endorse or promote products derived from this software without 
specific prior written permission. 

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/**
 * EK_Template Engine Adapter
 *
 * This Adapter extends the builtin TemplateEngine Class and overwrites
 * the fetch method.
 * If you want to use another Template Engine you have to implement three
 * methods in your class.webapp.php
 *
 * 1. <TEMPLATE_ENGINE_NAME>_init().
 * This method is called to initialize the external templating system.
 * Example: If you use Smarty here's the chance to set up things like
 * Compiled Dir etc.
 *
 * 2. <TEMPLATE_ENGINE_NAME>_assignValues( &$tpl ).
 * This method is called to assign all values to the template.
 * Example: If you use Smarty you can call the smarty assign functions
 * but you have to make sure that you assign the right value to the right
 * template.
 * 
 * This technique is used to assure a unique Namespace for the Template Engines
 * @todo Create a concept so that no adapter is needed
 *
 * @author Gaetan Lauff <glauff@plansoft.de>
 * @version	$Id: class.ek_template_engine_adapter.php 1 2006-01-31 14:55:23Z glauff $
 * @package template.engine
 */
class EK_TemplateEngineAdapter extends EK_TemplateEngine
{
	/**
	 * @var	string
	 */
	var $engine;
	
	/**
	 * Constructor
	 *
	 * @param 	reference	&$ekObject
	 * @param 	string		$engine
	 * @return 	void
	 *
	 * @access 	public
	 */
	function EK_TemplateEngineAdapter( &$ekObject, $engine, &$tpl )
	{
		$this->ekObject =& $ekObject;
		$this->tpl		=& $tpl;
		
		if ( class_exists( $engine ) ) {
			$this->engine =& new $engine();
		} else {
			$this->engine = $engine;
		}
	}
	
	/**
	 * Prepare Template is delegated to an application Method
	 *
	 * @param 	reference	&$tpl	A Reference to the current Template Object
	 * @return  string		The treated Template
	 *
	 * @access 	private
	 */
	function fetch()
	{
		if (is_object( $this->engine ) ) {
			return $this->engine->fetch( $this->tpl );
		}
		
		$initEngine = $this->engine . '_init';
		$this->ekObject->$initEngine();
		
		$assignValues = $this->engine . '_assignValues';
		$this->ekObject->$assignValues( $this->tpl );
		
		$fetch = $this->engine . '_fetch';
		$template = $this->ekObject->$fetch( $this->tpl );
		
		return $this->translate( $template );
	}
}
?>