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 /**

  * Copyright (c) 2012, Ben Fortuna

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met:

  *

  *  o Redistributions of source code must retain the above copyright

  * notice, this list of conditions and the following disclaimer.

  *

  *  o 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.

  *

  *  o Neither the name of Ben Fortuna nor the names of any other 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.

  */

 package net.fortuna.ical4j.model;

 import java.io.IOException;

 import java.io.Serializable;

 import java.text.DecimalFormat;

 import java.text.NumberFormat;

 import net.fortuna.ical4j.util.Dates;

 import org.apache.commons.lang.builder.HashCodeBuilder;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 /**

  * $Id$

  *

  * Created on 26/06/2005

  *

  * Represents a timezone offset from UTC time.

  *

  * @author Ben Fortuna

  */

 public class UtcOffset implements Serializable {

     private static final long serialVersionUID = 5883111996721531728L;

     private static final int HOUR_START_INDEX = 1;

     private static final int HOUR_END_INDEX = 3;

     private static final int MINUTE_START_INDEX = 3;

     private static final int MINUTE_END_INDEX = 5;

     private static final int SECOND_START_INDEX = 5;

     private static final int SECOND_END_INDEX = 7;

     private static final NumberFormat HOUR_FORMAT = new DecimalFormat("00");

     private static final NumberFormat MINUTE_FORMAT = new DecimalFormat("00");

     private static final NumberFormat SECOND_FORMAT = new DecimalFormat("00");

     private long offset;

     /**

      * @param value a string representation of an offset

      */

     public UtcOffset(final String value) {

         if (value.length() < MINUTE_END_INDEX) {

             throw new IllegalArgumentException("Invalid UTC offset [" + value

                     + "] - must be of the form: (+/-)HHMM[SS]");

         }

         final boolean negative = value.charAt(0) == '-';

         if (!negative && !(value.charAt(0) == '+')) {

             throw new IllegalArgumentException("UTC offset value must be signed");

         }

         offset = 0;

         offset += Integer.parseInt(value.substring(HOUR_START_INDEX,

                 HOUR_END_INDEX))

                 * Dates.MILLIS_PER_HOUR;

         offset += Integer.parseInt(value.substring(MINUTE_START_INDEX,

                 MINUTE_END_INDEX))

                 * Dates.MILLIS_PER_MINUTE;

         if (value.length() == SECOND_END_INDEX) {

             offset += Integer.parseInt(value.substring(SECOND_START_INDEX,

                     SECOND_END_INDEX))

                     * Dates.MILLIS_PER_SECOND;

         }

         if (negative) {

             offset = -offset;

         }

     }

     /**

      * @param offset an offset value in milliseconds

      */

     public UtcOffset(final long offset) {

         this.offset = (long) Math.floor(offset / (double) Dates.MILLIS_PER_SECOND) * Dates.MILLIS_PER_SECOND;

     }

     /**

      * {@inheritDoc}

      */

     public final String toString() {

         final StringBuffer b = new StringBuffer();

         long remainder = Math.abs(offset);

         if (offset < 0) {

             b.append('-');

         }

         else {

             b.append('+');

         }

         b.append(HOUR_FORMAT.format(remainder / Dates.MILLIS_PER_HOUR));

         remainder = remainder % Dates.MILLIS_PER_HOUR;

         b.append(MINUTE_FORMAT.format(remainder / Dates.MILLIS_PER_MINUTE));

         remainder = remainder % Dates.MILLIS_PER_MINUTE;

         if (remainder > 0) {

             b.append(SECOND_FORMAT.format(remainder / Dates.MILLIS_PER_SECOND));

         }

         return b.toString();

     }

     /**

      * @return Returns the offset.

      */

     public final long getOffset() {

         return offset;

     }

     /**

      * {@inheritDoc}

      */

     public final boolean equals(final Object arg0) {

         if (arg0 instanceof UtcOffset) {

             return getOffset() == ((UtcOffset) arg0).getOffset();

         }

         return super.equals(arg0);

     }

     /**

      * {@inheritDoc}

      */

     public final int hashCode() {

         return new HashCodeBuilder().append(getOffset()).toHashCode();

     }

 }