/*
    * $Id: Trigger.java [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 java.util.Date;
  
  import net.fortuna.ical4j.model.Parameter;
  import net.fortuna.ical4j.model.ParameterList;
  import net.fortuna.ical4j.model.Property;
  import net.fortuna.ical4j.model.ValidationException;
  import net.fortuna.ical4j.model.parameter.Value;
  import net.fortuna.ical4j.util.DateTimeFormat;
  import net.fortuna.ical4j.util.DurationFormat;
  import net.fortuna.ical4j.util.ParameterValidator;
  
  /***
   * Defines a TRIGGER iCalendar component property.
   *
   * @author benf
   */
  public class Trigger extends Property {
  
      private long duration;
  
      /***
       * The value type can be set to a DATE-TIME value type, in which case the
       * value MUST specify a UTC formatted DATE-TIME value.
       */
      private Date dateTime;
  
      /***
       * @param aList
       *            a list of parameters for this component
       * @param aValue
       *            a value string for this component
       * @throws ParseException
       *             when the specified string is not a valid duration or
       *             date-time representation
       */
      public Trigger(final ParameterList aList, final String aValue)
              throws ParseException {
          super(TRIGGER, aList);
  
          try {
              duration = DurationFormat.getInstance().parse(aValue);
          }
          catch (Exception e) {
              dateTime = DateTimeFormat.getInstance().parse(aValue);
          }
      }
  
      /***
       * @param aList
       *            a list of parameters for this component
       * @param aDuration
       *            a duration in milliseconds
       */
      public Trigger(final ParameterList aList, final long aDuration) {
          super(TRIGGER, aList);
  
          duration = aDuration;
      }
  
      /***
       * @param aList
       *            a list of parameters for this component
       * @param aDate
      *            a date representation of a date-time
      */
     public Trigger(final ParameterList aList, final Date aDate) {
         super(TRIGGER, aList);
 
         dateTime = aDate;
     }
 
     /***
      * @see net.fortuna.ical4j.model.Property#validate()
      */
     public final void validate() throws ValidationException {
 
         if (duration > 0) {
 
             /*
              * ; the following are optional, ; but MUST NOT occur more than once
              *
              * (";" "VALUE" "=" "DURATION") / (";" trigrelparam) /
              */
             ParameterValidator.getInstance().validateOneOrLess(Parameter.VALUE,
                     getParameters());
 
             Parameter valueParam = getParameters()
                     .getParameter(Parameter.VALUE);
 
             if (valueParam != null
                     && !Value.DURATION.equals(valueParam.getValue())) { throw new ValidationException(
                     "Parameter [" + Parameter.VALUE + "] is invalid"); }
 
             ParameterValidator.getInstance().validateOneOrLess(
                     Parameter.RELATED, getParameters());
 
             /*
              * ; the following is optional, ; and MAY occur more than once
              *
              * (";" xparam) ) ":" dur-value
              */
 
         }
         else {
 
             /*
              * ; the following is REQUIRED, ; but MUST NOT occur more than once
              *
              * (";" "VALUE" "=" "DATE-TIME") /
              */
             ParameterValidator.getInstance().validateOne(Parameter.VALUE,
                     getParameters());
 
             Parameter valueParam = getParameters()
                     .getParameter(Parameter.VALUE);
 
             if (valueParam == null
                     || !Value.DATE_TIME.equals(valueParam.getValue())) { throw new ValidationException(
                     "Parameter [" + Parameter.VALUE + "] is invalid"); }
 
             /*
              * ; the following is optional, ; and MAY occur more than once
              *
              * (";" xparam) ) ":" date-time
              */
         }
     }
 
     /***
      * @return Returns the dateTime.
      */
     public final Date getDateTime() {
         return dateTime;
     }
 
     /***
      * @return Returns the duration.
      */
     public final long getDuration() {
         return duration;
     }
 
     /*
      * (non-Javadoc)
      *
      * @see net.fortuna.ical4j.model.Property#getValue()
      */
     public String getValue() {
         if (getDateTime() != null) {
             return DateTimeFormat.getInstance().format(getDateTime());
         }
         else {
             return DurationFormat.getInstance().format(getDuration());
         }
     }
 }