DtStamp.java

/*
 * $Id: DtStamp.java,v 1.10 2005/10/08 07:48:20 fortuna Exp $
 * 
 * Created: [Apr 6, 2004]
 *
 * Copyright (c) 2004, 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.property;

import java.text.ParseException;

import net.fortuna.ical4j.model.DateTime;
import net.fortuna.ical4j.model.ParameterList;

/**
 * Defines a DTSTAMP iCalendar component property.
 * 
 * <pre>
 * 4.8.7.2 Date/Time Stamp
 * 
 *    Property Name: DTSTAMP
 * 
 *    Purpose: The property indicates the date/time that the instance of
 *    the iCalendar object was created.
 * 
 *    Value Type: DATE-TIME
 * 
 *    Property Parameters: Non-standard property parameters can be
 *    specified on this property.
 * 
 *    Conformance: This property MUST be included in the "VEVENT", "VTODO",
 *    "VJOURNAL" or "VFREEBUSY" calendar components.
 * 
 *    Description: The value MUST be specified in the UTC time format.
 * 
 *    This property is also useful to protocols such as [IMIP] that have
 *    inherent latency issues with the delivery of content. This property
 *    will assist in the proper sequencing of messages containing iCalendar
 *    objects.
 * 
 *    This property is different than the "CREATED" and "LAST-MODIFIED"
 *    properties. These two properties are used to specify when the
 *    particular calendar data in the calendar store was created and last
 *    modified. This is different than when the iCalendar object
 *    representation of the calendar service information was created or
 *    last modified.
 * 
 *    Format Definition: The property is defined by the following notation:
 * 
 *      dtstamp    = "DTSTAMP" stmparam ":" date-time CRLF
 * 
 *      stmparam   = *(";" xparam)
 * </pre>
 *
 * @author Ben Fortuna
 */
public class DtStamp extends UtcProperty {
    
    private static final long serialVersionUID = 7581197869433744070L;

    /**
     * Default constructor. Initialises the dateTime value to the time
     * of instantiation.
     */
    public DtStamp() {
        super(DTSTAMP);
    }
    
    /**
     * @param aList
     *            a list of parameters for this component
     * @param aValue
     *            a value string for this component
     * @throws ParseException
     *             where the specified value string is not a valid
     *             date-time/date representation
     */
    public DtStamp(final ParameterList aList, final String aValue)
            throws ParseException {
        super(DTSTAMP, aList);
        setValue(aValue);
    }

    /**
     * @param aDate
     *            a date representing a date-time
     */
    public DtStamp(final DateTime aDate) {
        super(DTSTAMP);
        // time must be in UTC..
        aDate.setUtc(true);
        setDate(aDate);
    }

    /**
     * @param aList
     *            a list of parameters for this component
     * @param aDate
     *            a date representing a date-time
     */
    public DtStamp(final ParameterList aList, final DateTime aDate) {
        super(DTSTAMP, aList);
        // time must be in UTC..
        aDate.setUtc(true);
        setDate(aDate);
    }
}