/*

  * Copyright 2011 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  * http://www.opensource.org/licenses/ecl1.php

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.kuali.rice.kim.impl.jaxb;

 import java.io.InputStream;

 import java.io.OutputStream;

 import java.util.List;

 import javax.xml.bind.JAXBContext;

 import javax.xml.bind.JAXBException;

 import javax.xml.bind.Marshaller;

 import javax.xml.bind.Unmarshaller;

 import org.kuali.rice.core.impl.jaxb.DataXmlDTO;

 /**

  * Helper class for importing and exporting KIM XML.

  * 

  * <p>TODO: Should this be converted into a service instead?

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public final class KimXmlUtil {

     // Do not allow outside code to instantiate this class.

     private KimXmlUtil() {}

     /**

      * Parses permissions and/or roles from XML.

      * 

      * @param inputStream The input stream to read the XML from.

      */

     public static void parseKimXml(InputStream inputStream) {

         try {

             JAXBContext jaxbContext = JAXBContext.newInstance(DataXmlDTO.class);

             Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();

             unmarshaller.unmarshal(inputStream);

         } catch (JAXBException e) {

             throw new RuntimeException(e);

         }

     }

     /**

      * Exports one or more sets of KIM objects to XML.

      * 

      * @param outputStream The output stream to write the XML to.

      * @param permissions The KIM permissions to export; set to a null or empty list to prevent exportation of a <permissionData> element.

      * @param roles The KIM roles to export; set to a null or empty list to prevent exportation of a <roleData> element.

      */

     public static void exportKimXml(OutputStream outputStream, List<? extends Object> permissions, List<? extends Object> roles) {

         PermissionDataXmlDTO permissionData = (permissions != null && !permissions.isEmpty()) ?

                 new PermissionDataXmlDTO(new PermissionsXmlDTO(permissions)) : null;

         RoleDataXmlDTO roleData = (roles != null && !roles.isEmpty()) ?

                 new RoleDataXmlDTO(new RolesXmlDTO(roles)) : null;

         try {

             JAXBContext jaxbContext = JAXBContext.newInstance(DataXmlDTO.class);

             Marshaller marshaller = jaxbContext.createMarshaller();

             marshaller.marshal(new DataXmlDTO(permissionData, roleData, null), outputStream);

         } catch (JAXBException e) {

             throw new RuntimeException(e);

         }

     }

 }