/**

  * Copyright 2010 Sven Diedrichsen

  *

  * Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0

  *

  * 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.

  *

  * @author sven

  * @version $Id: $

  */

 package de.jollyday.util;

 import java.io.IOException;

 import java.io.InputStream;

 import java.time.DayOfWeek;

 import java.util.logging.Logger;

 import javax.xml.bind.JAXBContext;

 import javax.xml.bind.JAXBElement;

 import javax.xml.bind.JAXBException;

 import javax.xml.bind.Unmarshaller;

 import de.jollyday.HolidayType;

 import de.jollyday.config.Configuration;

 import de.jollyday.config.Month;

 import de.jollyday.config.ObjectFactory;

 import de.jollyday.config.Weekday;

 import de.jollyday.holidaytype.LocalizedHolidayType;

 public class XMLUtil {

         /**

          * the package name to search for the generated java classes.

          */

         public static final String PACKAGE = "de.jollyday.config";

         private static Logger LOG = Logger.getLogger(XMLUtil.class.getName());

         private JAXBContextCreator contextCreator = new JAXBContextCreator();

         private ClassLoadingUtil classLoadingUtil = new ClassLoadingUtil();

         /**

          * Unmarshalls the configuration from the stream. Uses <code>JAXB</code> for

          * this.

          * 

          * @param stream

          *            a {@link java.io.InputStream} object.

          * @return The unmarshalled configuration.

          * @throws java.io.IOException

          *             Could not close the provided stream.

          */

         public Configuration unmarshallConfiguration(InputStream stream) throws IOException {

                 if (stream == null) {

                         throw new IllegalArgumentException("Stream is NULL. Cannot read XML.");

                 }

                 try {

                         JAXBContext ctx = null;

                         try {

                                 ctx = contextCreator.create(XMLUtil.PACKAGE, classLoadingUtil.getClassloader());

                         } catch (JAXBException e) {

                                 LOG.warning("Could not create JAXB context using the current threads context classloader. Defaulting to ObjectFactory classloader.");

                                 ctx = null;

                         }

                         if (ctx == null) {

                                 ctx = contextCreator.create(XMLUtil.PACKAGE, ObjectFactory.class.getClassLoader());

                         }

                         Unmarshaller um = ctx.createUnmarshaller();

                         @SuppressWarnings("unchecked")

                         JAXBElement<Configuration> el = (JAXBElement<Configuration>) um.unmarshal(stream);

                         return el.getValue();

                 } catch (JAXBException ue) {

                         throw new IllegalStateException("Cannot parse holidays XML file.", ue);

                 } finally {

                         stream.close();

                 }

         }

         /**

          * Returns the <code>DateTimeConstants</code> value for the given weekday.

          * 

          * @param weekday

          *            a {@link de.jollyday.config.Weekday} object.

          * @return a DayOfWeek instance.

          */

         public final DayOfWeek getWeekday(Weekday weekday) {

                 return DayOfWeek.valueOf(weekday.value());

                 }

         /**

          * Returns the <code>DateTimeConstants</code> value for the given month.

          * 

          * @param month

          *            a {@link de.jollyday.config.Month} object.

          * @return DateTimeConstants value.

          */

         public int getMonth(Month month) {

                 switch (month) {

                 case JANUARY:

                         return 1;

                 case FEBRUARY:

                         return 2;

                 case MARCH:

                         return 3;

                 case APRIL:

                         return 4;

                 case MAY:

                         return 5;

                 case JUNE:

                         return 6;

                 case JULY:

                         return 7;

                 case AUGUST:

                         return 8;

                 case SEPTEMBER:

                         return 9;

                 case OCTOBER:

                         return 10;

                 case NOVEMBER:

                         return 11;

                 case DECEMBER:

                         return 12;

                 default:

                         throw new IllegalArgumentException("Unknown month " + month);

                 }

         }

         /**

          * Gets the type.

          * 

          * @param type

          *            the type of holiday in the config

          * @return the type of holiday

          */

         public HolidayType getType(de.jollyday.config.HolidayType type) {

                 switch (type) {

                 case OFFICIAL_HOLIDAY:

                         return LocalizedHolidayType.OFFICIAL_HOLIDAY;

                 case UNOFFICIAL_HOLIDAY:

                         return LocalizedHolidayType.UNOFFICIAL_HOLIDAY;

                 default:

                         throw new IllegalArgumentException("Unknown type " + type);

                 }

         }

         public class JAXBContextCreator {

                 public JAXBContext create(String packageName, ClassLoader classLoader) throws JAXBException {

                         return JAXBContext.newInstance(packageName, classLoader);

                 }

         }

 }