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/* timerange.vala
*
* Copyright © 2011-2012 Collabora Ltd.
* By Seif Lotfy <seif@lotfy.com>
* By Siegfried-Angel Gevatter Pujals <siegfried@gevatter.com>
* Copyright © 2011 Michal Hruby <michal.mhr@gmail.com>
* Copyright © 2012 Canonical Ltd.
* By Siegfried-A. Gevatter <siegfried.gevatter@collabora.co.uk>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
using Zeitgeist;
namespace Zeitgeist
{
/**
* Immutable representation of an interval in time, marked by a
* beginning and an end
*
* A light, immutable, encapsulation of an interval in time, marked by
* a beginning and an end.
*/
[CCode (type_signature = "(xx)")]
public class TimeRange: Object
{
public int64 start { get; private set; }
public int64 end { get; private set; }
/**
* @param start_msec starting timestamp in number of milliseconds
* since the Unix Epoch
* @param end_msec ending timestamp in number of milliseconds
* since the Unix Epoch
* @return a newly allocated ZeitgeistTimeRange. Free with
* g_object_unref()
*/
public TimeRange (int64 start_msec, int64 end_msec)
{
start = start_msec;
end = end_msec;
}
/**
* @return a new time range starting from the beginning of the Unix
* Epoch stretching to the end of time
*/
public TimeRange.anytime ()
{
this (0, int64.MAX);
}
/**
* @return a new time range starting from the beggining of the
* Unix Epoch ending a the moment of invocation
*/
public TimeRange.to_now ()
{
this (0, Timestamp.from_now ());
}
/**
* @return a new time range starting from the moment of invocation
* to the end of time
*/
public TimeRange.from_now ()
{
this (Timestamp.from_now (), int64.MAX);
}
/**
* Create a #TimeRange from a variant.
*
* @param variant a variant representing a #TimeRange
* @return a new time range starting from the moment of invocation
* to the end of time
*/
public TimeRange.from_variant (Variant variant)
throws DataModelError
{
Utils.assert_sig (variant.get_type_string () == "(xx)",
"Invalid D-Bus signature.");
int64 start_msec = 0;
int64 end_msec = 0;
variant.get ("(xx)", &start_msec, &end_msec);
this (start_msec, end_msec);
}
/**
* @return a new variant holding the time range
*/
public Variant to_variant ()
{
return new Variant ("(xx)", start, end);
}
/**
* Check whether two time ranges are intersecting.
*
* @param time_range the second time range to compare with
* @return a new time range representing the intersection
*/
public TimeRange? intersect (TimeRange time_range)
{
var result = new TimeRange(0,0);
if (start < time_range.start)
if (end < time_range.start)
return null;
else
result.start = time_range.start;
else
if (start > time_range.end)
return null;
else
result.start = start;
if (end < time_range.end)
if (end < time_range.start)
return null;
else
result.end = end;
else
if (start > time_range.end)
return null;
else
result.end = time_range.end;
return result;
}
}
}
// vim:expandtab:ts=4:sw=4
|
