Module ical4j.core
Package net.fortuna.ical4j.model.property

Class Sequence

java.lang.Object
net.fortuna.ical4j.model.Content
net.fortuna.ical4j.model.Property
net.fortuna.ical4j.model.property.Sequence
All Implemented Interfaces:
Serializable, Comparable<Property>, FluentProperty, Prototype<Property>
public class Sequence extends Property
$Id$

Created: [Apr 6, 2004]

Defines a SEQUENCE iCalendar component property. 

     4.8.7.4 Sequence Number

        Property Name: SEQUENCE

        Purpose: This property defines the revision sequence number of the
        calendar component within a sequence of revisions.

        Value Type: integer

        Property Parameters: Non-standard property parameters can be
        specified on this property.

        Conformance: The property can be specified in "VEVENT", "VTODO" or
        "VJOURNAL" calendar component.

        Description: When a calendar component is created, its sequence
        number is zero (US-ASCII decimal 48). It is monotonically incremented
        by the "Organizer's" CUA each time the "Organizer" makes a
        significant revision to the calendar component. When the "Organizer"
        makes changes to one of the following properties, the sequence number
        MUST be incremented:

          .  "DTSTART"

          .  "DTEND"

          .  "DUE"

          .  "RDATE"

          .  "RRULE"

          .  "EXDATE"

          .  "EXRULE"

          .  "STATUS"

        In addition, changes made by the "Organizer" to other properties can
        also force the sequence number to be incremented. The "Organizer" CUA
        MUST increment the sequence number when ever it makes changes to
        properties in the calendar component that the "Organizer" deems will
        jeopardize the validity of the participation status of the
        "Attendees". For example, changing the location of a meeting from one
        locale to another distant locale could effectively impact the
        participation status of the "Attendees".

        The "Organizer" includes this property in an iCalendar object that it
        sends to an "Attendee" to specify the current version of the calendar
        component.

        The "Attendee" includes this property in an iCalendar object that it
        sends to the "Organizer" to specify the version of the calendar
        component that the "Attendee" is referring to.

        A change to the sequence number is not the mechanism that an
        "Organizer" uses to request a response from the "Attendees". The
        "RSVP" parameter on the "ATTENDEE" property is used by the
        "Organizer" to indicate that a response from the "Attendees" is
        requested.

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

          seq = "SEQUENCE" seqparam ":" integer CRLF
          ; Default is "0"

          seqparam   = *(";" xparam)

        Example: The following is an example of this property for a calendar
        component that was just created by the "Organizer".

          SEQUENCE:0

        The following is an example of this property for a calendar component
        that has been revised two different times by the "Organizer".

          SEQUENCE:2
See Also:

  • Constructor Details

    • Sequence

      public Sequence()
      Default constructor.

    • Sequence

      public Sequence(String aValue)
      Parameters:
      aValue - a value string for this component

    • Sequence

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

    • Sequence

      public Sequence(int aSequenceNo)
      Parameters:
      aSequenceNo - a sequence number

    • Sequence

      public Sequence(ParameterList aList, int aSequenceNo)
      Parameters:
      aList - a list of parameters for this component
      aSequenceNo - a sequence number

  • Method Details