Package net.fortuna.ical4j.model.property

Class Trigger

  • All Implemented Interfaces:
    Serializable, Comparable<Property>, FluentProperty, UtcProperty
    public class Trigger
extends DateProperty<Instant>
implements UtcProperty
    $Id$

    Created: [Apr 6, 2004]

    Defines a TRIGGER iCalendar component property. 

         4.8.6.3 Trigger

        Property Name: TRIGGER

        Purpose: This property specifies when an alarm will trigger.

        Value Type: The default value type is 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.

        Property Parameters: Non-standard, value data type, time zone
        identifier or trigger relationship property parameters can be
        specified on this property. The trigger relationship property
        parameter MUST only be specified when the value type is DURATION.

        Conformance: This property MUST be specified in the "VALARM" calendar
        component.

        Description: Within the "VALARM" calendar component, this property
        defines when the alarm will trigger. The default value type is
        DURATION, specifying a relative time for the trigger of the alarm.
        The default duration is relative to the start of an event or to-do
        that the alarm is associated with. The duration can be explicitly set

        to trigger from either the end or the start of the associated event
        or to-do with the "RELATED" parameter. A value of START will set the
        alarm to trigger off the start of the associated event or to-do. A
        value of END will set the alarm to trigger off the end of the
        associated event or to-do.

        Either a positive or negative duration may be specified for the
        "TRIGGER" property. An alarm with a positive duration is triggered
        after the associated start or end of the event or to-do. An alarm
        with a negative duration is triggered before the associated start or
        end of the event or to-do.

        The "RELATED" property parameter is not valid if the value type of
        the property is set to DATE-TIME (i.e., for an absolute date and time
        alarm trigger). If a value type of DATE-TIME is specified, then the
        property value MUST be specified in the UTC time format. If an
        absolute trigger is specified on an alarm for a recurring event or
        to-do, then the alarm will only trigger for the specified absolute
        date/time, along with any specified repeating instances.

        If the trigger is set relative to START, then the "DTSTART" property
        MUST be present in the associated "VEVENT" or "VTODO" calendar
        component. If an alarm is specified for an event with the trigger set
        relative to the END, then the "DTEND" property or the "DSTART" and
        "DURATION' properties MUST be present in the associated "VEVENT"
        calendar component. If the alarm is specified for a to-do with a
        trigger set relative to the END, then either the "DUE" property or
        the "DSTART" and "DURATION' properties MUST be present in the
        associated "VTODO" calendar component.

        Alarms specified in an event or to-do which is defined in terms of a
        DATE value type will be triggered relative to 00:00:00 UTC on the
        specified date. For example, if "DTSTART:19980205, then the duration
        trigger will be relative to19980205T000000Z.

        Format Definition: The property is defined by the following notation:

          trigger    = "TRIGGER" (trigrel / trigabs)

          trigrel    = *(

                     ; the following are optional,
                     ; but MUST NOT occur more than once

                       (";" "VALUE" "=" "DURATION") /
                       (";" trigrelparam) /

                     ; the following is optional,
                     ; and MAY occur more than once

                       (";" xparam)
                       ) ":"  dur-value

          trigabs    = 1*(

                     ; the following is REQUIRED,
                     ; but MUST NOT occur more than once

                       (";" "VALUE" "=" "DATE-TIME") /

                     ; the following is optional,
                     ; and MAY occur more than once

                       (";" xparam)

                       ) ":" date-time
    See Also:
    Serialized Form

    • Constructor Detail

      • Trigger

        public Trigger()
        Default constructor.

      • Trigger

        public Trigger​(ParameterList aList,
               String aValue)
        Parameters:
        aList - a list of parameters for this component
        aValue - a value string for this component

      • Trigger

        @Deprecated
public Trigger​(Dur duration)
        Deprecated.
        Parameters:
        duration - a duration in milliseconds

      • Trigger

        public Trigger​(TemporalAmount duration)
        Parameters:
        duration - a duration in milliseconds

      • Trigger

        @Deprecated
public Trigger​(ParameterList aList,
               Dur duration)
        Deprecated.
        Parameters:
        aList - a list of parameters for this component
        duration - a duration in milliseconds

      • Trigger

        public Trigger​(ParameterList aList,
               TemporalAmount duration)
        Parameters:
        aList - a list of parameters for this component
        duration - a duration in milliseconds

      • Trigger

        public Trigger​(Instant dateTime)
        Parameters:
        dateTime - a date representation of a date-time

      • Trigger

        public Trigger​(ParameterList aList,
               Instant dateTime)
        Parameters:
        aList - a list of parameters for this component
        dateTime - a date representation of a date-time