<?php
/**
 * An ObjectRegistry template engine class for XML templates
 *
 * @author		Roland Haeder <webmaster@ship-simu.org>
 * @version		0.0.0
 * @copyright	Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2011 Core Developer Team
 * @license		GNU GPL 3.0 or any newer version
 * @link		http://www.ship-simu.org
 * @todo		This template engine does not make use of setTemplateType()
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */
class XmlObjectRegistryTemplateEngine extends BaseTemplateEngine implements CompileableTemplate {
	/**
	 * Instance for the object registry
	 */
	private $objectRegistryInstance = null;

	/**
	 * Main nodes in the XML tree
	 */
	private $mainNodes = array(
		'object-registry'
	);

	/**
	 * Sub nodes in the XML tree
	 */
	private $subNodes = array(
		'object-list',
		'object-list-entry',
		'object-name',
		'object-recipient-limitation',
		'object-max-spread',
		'object-protocol',
		'object-recipient-type'
	);

	/**
	 * Current main node
	 */
	private $curr = array();

	/**
	 * Content from dependency
	 */
	private $dependencyContent = array();

	/**
	 * Protected constructor
	 *
	 * @return	void
	 */
	protected function __construct () {
		// Call parent constructor
		parent::__construct(__CLASS__);

		// Init object type registry instance
		$this->objectRegistryInstance = ObjectFactory::createObjectByConfiguredName('node_object_type_registry_class');
	}

	/**
	 * Creates an instance of the class TemplateEngine and prepares it for usage
	 *
	 * @param	$applicationInstance	A manageable application
	 * @return	$templateInstance		An instance of TemplateEngine
	 * @throws	BasePathIsEmptyException		If the provided $templateBasePath is empty
	 * @throws	InvalidBasePathStringException	If $templateBasePath is no string
	 * @throws	BasePathIsNoDirectoryException	If $templateBasePath is no
	 *											directory or not found
	 * @throws	BasePathReadProtectedException	If $templateBasePath is
	 *											read-protected
	 */
	public static final function createXmlObjectRegistryTemplateEngine (ManageableApplication $applicationInstance) {
		// Get a new instance
		$templateInstance = new XmlObjectRegistryTemplateEngine();

		// Determine base path
		$templateBasePath = $templateInstance->getConfigInstance()->getConfigEntry('application_base_path') . $applicationInstance->getRequestInstance()->getRequestElement('app') . '/';

		// Is the base path valid?
		if (empty($templateBasePath)) {
			// Base path is empty
			throw new BasePathIsEmptyException($templateInstance, self::EXCEPTION_UNEXPECTED_EMPTY_STRING);
		} elseif (!is_string($templateBasePath)) {
			// Is not a string
			throw new InvalidBasePathStringException(array($templateInstance, $templateBasePath), self::EXCEPTION_INVALID_STRING);
		} elseif (!is_dir($templateBasePath)) {
			// Is not a path
			throw new BasePathIsNoDirectoryException(array($templateInstance, $templateBasePath), self::EXCEPTION_INVALID_PATH_NAME);
		} elseif (!is_readable($templateBasePath)) {
			// Is not readable
			throw new BasePathReadProtectedException(array($templateInstance, $templateBasePath), self::EXCEPTION_READ_PROTECED_PATH);
		}

		// Set the base path
		$templateInstance->setTemplateBasePath($templateBasePath);

		// Set template extensions
		$templateInstance->setRawTemplateExtension($templateInstance->getConfigInstance()->getConfigEntry('raw_template_extension'));
		$templateInstance->setCodeTemplateExtension($templateInstance->getConfigInstance()->getConfigEntry('node_object_registry_template_extension'));

		// Absolute output path for compiled templates
		$templateInstance->setCompileOutputPath($templateInstance->getConfigInstance()->getConfigEntry('base_path') . $templateInstance->getConfigInstance()->getConfigEntry('compile_output_path'));

		// Init a variable stacker
		$stackerInstance = ObjectFactory::createObjectByConfiguredName('node_object_registry_stacker_class');

		// Set it
		$templateInstance->setStackerInstance($stackerInstance);

		// Return the prepared instance
		return $templateInstance;
	}

	/**
	 * Load a specified object_registry template into the engine
	 *
	 * @param	$template	The object_registry template we shall load which is
	 *						located in 'object_registry' by default
	 * @return	void
	 */
	public function loadObjectRegistryTemplate ($template) {
		// Set template type
		$this->setTemplateType($this->getConfigInstance()->getConfigEntry('node_object_registry_template_type'));

		// Load the special template
		$this->loadTemplate($template);
	}

	/**
	 * Getter for current main node
	 *
	 * @return	$currMainNode	Current main node
	 */
	public final function getCurrMainNode () {
		return $this->curr['main_node'];
	}

	/**
	 * Setter for current main node
	 *
	 * @param	$element		Element name to set as current main node
	 * @return	$currMainNode	Current main node
	 */
	private final function setCurrMainNode ($element) {
		$this->curr['main_node'] = (string) $element;
	}

	/**
	 * Getter for main node array
	 *
	 * @return	$mainNodes	Array with valid main node names
	 */
	public final function getMainNodes () {
		return $this->mainNodes;
	}

	/**
	 * Getter for sub node array
	 *
	 * @return	$subNodes	Array with valid sub node names
	 */
	public final function getSubNodes () {
		return $this->subNodes;
	}

	/**
	 * Handles the start element of an XML resource
	 *
	 * @param	$resource		XML parser resource (currently ignored)
	 * @param	$element		The element we shall handle
	 * @param	$attributes		All attributes
	 * @return	void
	 * @throws	InvalidXmlNodeException		If an unknown/invalid XML node name was found
	 */
	public function startElement ($resource, $element, array $attributes) {
		// Initial method name which will never be called...
		$methodName = 'initObjectRegistry';

		// Make the element name lower-case
		$element = strtolower($element);

		// Is the element a main node?
		//* DEBUG: */ echo "START: &gt;".$element."&lt;<br />\n";
		if (in_array($element, $this->getMainNodes())) {
			// Okay, main node found!
			$methodName = 'start' . $this->convertToClassName($element);

			// Set it
			$this->setCurrMainNode($element);
		} elseif (in_array($element, $this->getSubNodes())) {
			// Sub node found
			$methodName = 'start' . $this->convertToClassName($element);
		} else {
			// Invalid node name found
			throw new InvalidXmlNodeException(array($this, $element, $attributes), XmlParser::EXCEPTION_XML_NODE_UNKNOWN);
		}

		// Call method
		call_user_func_array(array($this, $methodName), $attributes);
	}

	/**
	 * Ends the main or sub node by sending out the gathered data
	 *
	 * @param	$resource	An XML resource pointer (currently ignored)
	 * @param	$nodeName	Name of the node we want to finish
	 * @return	void
	 * @throws	XmlNodeMismatchException	If current main node mismatches the closing one
	 */
	public function endElement ($resource, $nodeName) {
		// Make all lower-case
		$nodeName = strtolower($nodeName);

		// Does this match with current main node?
		//* DEBUG: */ echo "END: &gt;".$nodeName."&lt;<br />\n";
		if (($nodeName != $this->getCurrMainNode()) && (in_array($nodeName, $this->getMainNodes()))) {
			// Did not match!
			throw new XmlNodeMismatchException (array($this, $nodeName, $this->getCurrMainNode()), XmlParser::EXCEPTION_XML_NODE_MISMATCH);
		} // END - if

		// Construct method name
		$methodName = 'finish' . $this->convertToClassName($nodeName);

		// Call the corresponding method
		//* DEBUG: */ echo "call: ".$methodName."<br />\n";
		call_user_func_array(array($this, $methodName), array());
	}

	/**
	 * Currently not used
	 *
	 * @param	$resource		XML parser resource (currently ignored)
	 * @param	$characters		Characters to handle
	 * @return	void
	 * @todo	Find something useful with this!
	 */
	public function characterHandler ($resource, $characters) {
		// Trim all spaces away
		$characters = trim($characters);

		// Is this string empty?
		if (empty($characters)) {
			// Then skip it silently
			return false;
		} // END - if

		// Get current XML node name as an array index
		$nodeName = $this->getStackerInstance()->getNamed('object_registry');

		// Is the node name 'object-name'?
		if ($nodeName == 'object-name') {
			// Output debug message
			$this->debugOutput('TAGS: Adding object type ' . $characters . ' to registry.');
		} // END - if

		// Add it to the registry
		$this->objectRegistryInstance->addEntry($nodeName, $characters);
	}

	/**
	 * Handles the template dependency for given node
	 *
	 * @param	$node					The node we should load a dependency template
	 * @param	$templateDependency		A template to load to satisfy dependencies
	 * @return	void
	 */
	private function handleTemplateDependency ($node, $templateDependency) {
		// Is the template dependency set?
		if ((!empty($templateDependency)) && (!isset($this->dependencyContent[$node]))) {
			// Get a temporay template instance
			$templateInstance = ObjectFactory::createObjectByConfiguredName('node_object_registry_template_class', array($this->getApplicationInstance()));

			// Then load it
			$templateInstance->loadObjectRegistryTemplate($templateDependency);

			// Parse the XML content
			$templateInstance->renderXmlContent();

			// Save the parsed raw content in our dependency array
			$this->dependencyContent[$node] = $templateInstance->getRawTemplateData();
		} // END - if
	}

	/**
	 * Getter for cache file (FQFN)
	 *
	 * @return	$fqfn	Full-qualified file name of the menu cache
	 */
	public function getObjectRegistryCacheFqfn () {
		$this->partialStub('Please implement this method.');
	}

	/**
	 * Starts the object-registry
	 *
	 * @return	void
	 */
	private function startObjectRegistry () {
		// Push the node name on the stacker
		$this->getStackerInstance()->pushNamed('object_registry', 'object-registry');
	}

	/**
	 * Starts the object-list
	 *
	 * @return	void
	 */
	private function startObjectList () {
		// Push the node name on the stacker
		$this->getStackerInstance()->pushNamed('object_registry', 'object-list');
	}

	/**
	 * Starts the object-list-entry
	 *
	 * @return	void
	 */
	private function startObjectListEntry () {
		// Push the node name on the stacker
		$this->getStackerInstance()->pushNamed('object_registry', 'object-list');
	}

	/**
	 * Starts the object-name
	 *
	 * @return	void
	 */
	private function startObjectName () {
		// Push the node name on the stacker
		$this->getStackerInstance()->pushNamed('object_registry', 'object-name');
	}

	/**
	 * Starts the object-recipient-limitation
	 *
	 * @return	void
	 */
	private function startObjectRecipientLimitation () {
		// Push the node name on the stacker
		$this->getStackerInstance()->pushNamed('object_registry', 'object-recipient-limitation');
	}

	/**
	 * Starts the object-max-spread
	 *
	 * @return	void
	 */
	private function startObjectMaxSpread () {
		// Push the node name on the stacker
		$this->getStackerInstance()->pushNamed('object_registry', 'object-max-spread');
	}

	/**
	 * Starts the object-protocol
	 *
	 * @return	void
	 */
	private function startObjectProtocol () {
		// Push the node name on the stacker
		$this->getStackerInstance()->pushNamed('object_registry', 'object-protocol');
	}

	/**
	 * Starts the object-recipient-type
	 *
	 * @return	void
	 */
	private function startObjectRecipientType () {
		// Push the node name on the stacker
		$this->getStackerInstance()->pushNamed('object_registry', 'object-recipient-type');
	}

	/**
	 * Finishes the object-recipient-type
	 *
	 * @return	void
	 */
	private function finishObjectRecipientType () {
		// Pop the last entry
		$this->getStackerInstance()->popNamed('object_registry');
	}

	/**
	 * Finishes the object-protocol
	 *
	 * @return	void
	 */
	private function finishObjectProtocol () {
		// Pop the last entry
		$this->getStackerInstance()->popNamed('object_registry');
	}

	/**
	 * Finishes the object-max-spread
	 *
	 * @return	void
	 */
	private function finishObjectMaxSpread () {
		// Pop the last entry
		$this->getStackerInstance()->popNamed('object_registry');
	}

	/**
	 * Finishes the object-recipient-limitation
	 *
	 * @return	void
	 */
	private function finishObjectRecipientLimitation () {
		// Pop the last entry
		$this->getStackerInstance()->popNamed('object_registry');
	}

	/**
	 * Finishes the object-name
	 *
	 * @return	void
	 */
	private function finishObjectName () {
		// Pop the last entry
		$this->getStackerInstance()->popNamed('object_registry');
	}

	/**
	 * Finishes the object-list-entry
	 *
	 * @return	void
	 */
	private function finishObjectListEntry () {
		// Pop the last entry
		$this->getStackerInstance()->popNamed('object_registry');
	}

	/**
	 * Finishes the object-list
	 *
	 * @return	void
	 */
	private function finishObjectList () {
		// Pop the last entry
		$this->getStackerInstance()->popNamed('object_registry');
	}

	/**
	 * Finishes the object-registry
	 *
	 * @return	void
	 */
	private function finishObjectRegistry () {
		// Pop the last entry
		$this->getStackerInstance()->popNamed('object_registry');
	}
}

// [EOF]
?>