/**
	 * Installs current package.
	 * 
	 * @param	array		$nodeData
	 */
	protected function installPackage(array $nodeData) {
		$installationStep = new PackageInstallationStep();
		
		// check requirements
		if (!empty($nodeData['requirements'])) {
			foreach ($nodeData['requirements'] as $package => $requirementData) {
				// get existing package
				if ($requirementData['packageID']) {
					$sql = "SELECT	packageName, packageVersion
						FROM	wcf".WCF_N."_package
						WHERE	packageID = ?";
					$statement = WCF::getDB()->prepareStatement($sql);
					$statement->execute(array($requirementData['packageID']));
				}
				else {
					// try to find matching package
					$sql = "SELECT	packageName, packageVersion
						FROM	wcf".WCF_N."_package
						WHERE	package = ?";
					$statement = WCF::getDB()->prepareStatement($sql);
					$statement->execute(array($package));
				}
				$row = $statement->fetchArray();
				
				// package is required but not available
				if ($row === false) {
					throw new SystemException("Package '".$package."' is required by '".$nodeData['packageName']."', but is neither installed nor shipped.");
				}
				
				// check version requirements
				if ($requirementData['minVersion']) {
					if (Package::compareVersion($row['packageVersion'], $requirementData['minVersion']) < 0) {
						throw new SystemException("Package '".$nodeData['packageName']."' requires the package '".$row['packageName']."' in version '".$requirementData['minVersion']."', but version '".$row['packageVersion']."'");
					}
				}
			}
		}
		unset($nodeData['requirements']);
		
		if (!$this->queue->packageID) {
			// create package entry
			$package = PackageEditor::create($nodeData);
			
			// update package id for current queue
			$queueEditor = new PackageInstallationQueueEditor($this->queue);
			$queueEditor->update(array(
				'packageID' => $package->packageID
			));
			
			// save excluded packages
			if (count($this->getArchive()->getExcludedPackages()) > 0) {
				$sql = "INSERT INTO	wcf".WCF_N."_package_exclusion 
							(packageID, excludedPackage, excludedPackageVersion)
					VALUES		(?, ?, ?)";
				$statement = WCF::getDB()->prepareStatement($sql);
				
				foreach ($this->getArchive()->getExcludedPackages() as $excludedPackage) {
					$statement->execute(array($package->packageID, $excludedPackage['name'], (!empty($excludedPackage['version']) ? $excludedPackage['version'] : '')));
				}
			}
			
			// if package is plugin to com.woltlab.wcf it must not have any other requirement
			$requirements = $this->getArchive()->getRequirements();
			
			// insert requirements and dependencies
			$requirements = $this->getArchive()->getAllExistingRequirements();
			if (!empty($requirements)) {
				$sql = "INSERT INTO	wcf".WCF_N."_package_requirement
							(packageID, requirement)
					VALUES		(?, ?)";
				$statement = WCF::getDB()->prepareStatement($sql);
				
				foreach ($requirements as $identifier => $possibleRequirements) {
					if (count($possibleRequirements) == 1) {
						$requirement = array_shift($possibleRequirements);
					}
					else {
						$requirement = $possibleRequirements[$this->selectedRequirements[$identifier]];
					}
					
					$statement->execute(array($package->packageID, $requirement['packageID']));
				}
			}
			
			// reload queue
			$this->queue = new PackageInstallationQueue($this->queue->queueID);
			$this->package = null;
			
			if ($package->isApplication) {
				$host = StringUtil::replace(RouteHandler::getProtocol(), '', RouteHandler::getHost());
				$path = RouteHandler::getPath(array('acp'));
				
				// insert as application
				ApplicationEditor::create(array(
					'domainName' => $host,
					'domainPath' => $path,
					'cookieDomain' => $host,
					'cookiePath' => $path,
					'packageID' => $package->packageID
				));
			}
		}
		
		if ($this->getPackage()->isApplication && $this->getPackage()->package != 'com.woltlab.wcf' && $this->getAction() == 'install') {
			if (empty($this->getPackage()->packageDir)) {
				$document = $this->promptPackageDir();
				if ($document !== null && $document instanceof FormDocument) {
					$installationStep->setDocument($document);
				}
				
				$installationStep->setSplitNode();
			}
		}
		
		return $installationStep;
	}