path: root/calendar/gui/e-meeting-attendee.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-attendee.c
 *
 * Copyright (C) 2001  Ximian, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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 General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Author: JP Rosevear
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <gtk/gtk.h>
#include "e-meeting-attendee.h"

struct _EMeetingAttendeePrivate {
    gchar *address;
    gchar *member;

    icalparameter_cutype cutype;
    icalparameter_role role;

    gboolean rsvp;

    gchar *delto;
    gchar *delfrom;

    icalparameter_partstat status;
    
    gchar *sentby;
    gchar *cn;
    gchar *language;

    EMeetingAttendeeEditLevel edit_level;

    gboolean has_calendar_info;

    GArray *busy_periods;
    gboolean busy_periods_sorted;

    EMeetingTime busy_periods_start;
    EMeetingTime busy_periods_end;
    gboolean start_busy_range_set;
    gboolean end_busy_range_set;
    
    gint longest_period_in_days;
};

enum {
    CHANGED,
    LAST_SIGNAL
};
static guint signals[LAST_SIGNAL];

static void e_meeting_attendee_finalize (GObject *obj);

G_DEFINE_TYPE (EMeetingAttendee, e_meeting_attendee, G_TYPE_OBJECT)

static void
e_meeting_attendee_class_init (EMeetingAttendeeClass *klass)
{
    GObjectClass *object_class;

    object_class = G_OBJECT_CLASS (klass);

    signals[CHANGED] =
        g_signal_new ("changed",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_FIRST,
                  G_STRUCT_OFFSET (EMeetingAttendeeClass, changed),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE, 0);

    object_class->finalize = e_meeting_attendee_finalize;
}

static gchar *
string_test (gchar *string)
{
    return string != NULL ? string : g_strdup ("");
}

static gboolean
string_is_set (gchar *string) 
{
    if (string != NULL && *string != '\0')
        return TRUE;
    
    return FALSE;
}

static void
notify_changed (EMeetingAttendee *ia) 
{
    g_signal_emit_by_name (G_OBJECT (ia), "changed");
}

static void
e_meeting_attendee_init (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;

    priv = g_new0 (EMeetingAttendeePrivate, 1);

    ia->priv = priv;

    priv->address = string_test (NULL);
    priv->member = string_test (NULL);

    priv->cutype = ICAL_CUTYPE_NONE;
    priv->role = ICAL_ROLE_NONE;

    priv->rsvp = FALSE;

    priv->delto = string_test (NULL);
    priv->delfrom = string_test (NULL);
    
    priv->status = ICAL_PARTSTAT_NONE;
    
    priv->sentby = string_test (NULL);
    priv->cn = string_test (NULL);
    priv->language = string_test (NULL);

    priv->edit_level = E_MEETING_ATTENDEE_EDIT_FULL;
    priv->has_calendar_info = FALSE;
    
    priv->busy_periods = g_array_new (FALSE, FALSE, sizeof (EMeetingFreeBusyPeriod));
    priv->busy_periods_sorted = FALSE;

    g_date_clear (&priv->busy_periods_start.date, 1);
    priv->busy_periods_start.hour = 0;
    priv->busy_periods_start.minute = 0;

    g_date_clear (&priv->busy_periods_end.date, 1);
    priv->busy_periods_end.hour = 0;
    priv->busy_periods_end.minute = 0;

    priv->start_busy_range_set = FALSE;
    priv->end_busy_range_set = FALSE;
    
    priv->longest_period_in_days = 0;
}


static void
e_meeting_attendee_finalize (GObject *obj)
{
    EMeetingAttendee *ia = E_MEETING_ATTENDEE (obj);
    EMeetingAttendeePrivate *priv;

    priv = ia->priv;

    g_free (priv->address);
    g_free (priv->member);

    g_free (priv->delto);
    g_free (priv->delfrom);

    g_free (priv->sentby);
    g_free (priv->cn);
    g_free (priv->language);
    
    g_array_free (priv->busy_periods, TRUE);
    
    g_free (priv);

    if (G_OBJECT_CLASS (e_meeting_attendee_parent_class)->finalize)
        (* G_OBJECT_CLASS (e_meeting_attendee_parent_class)->finalize) (obj);
}

GObject *
e_meeting_attendee_new (void)
{
    return g_object_new (E_TYPE_MEETING_ATTENDEE, NULL);
}

GObject *
e_meeting_attendee_new_from_e_cal_component_attendee (ECalComponentAttendee *ca)
{
    EMeetingAttendee *ia;
    
    ia = E_MEETING_ATTENDEE (g_object_new (E_TYPE_MEETING_ATTENDEE, NULL));

    e_meeting_attendee_set_address (ia, g_strdup (ca->value));
    e_meeting_attendee_set_member (ia, g_strdup (ca->member));
    e_meeting_attendee_set_cutype (ia, ca->cutype);
    e_meeting_attendee_set_role (ia, ca->role);
    e_meeting_attendee_set_status (ia, ca->status);
    e_meeting_attendee_set_rsvp (ia, ca->rsvp);
    e_meeting_attendee_set_delto (ia, g_strdup (ca->delto));
    e_meeting_attendee_set_delfrom (ia, g_strdup (ca->delfrom));
    e_meeting_attendee_set_sentby (ia, g_strdup (ca->sentby));
    e_meeting_attendee_set_cn (ia, g_strdup (ca->cn));
    e_meeting_attendee_set_language (ia, g_strdup (ca->language));
    
    return G_OBJECT (ia);
}

ECalComponentAttendee *
e_meeting_attendee_as_e_cal_component_attendee (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    ECalComponentAttendee *ca;

    priv = ia->priv;
    
    ca = g_new0 (ECalComponentAttendee, 1);

    ca->value = priv->address;
    ca->member = string_is_set (priv->member) ? priv->member : NULL;
    ca->cutype= priv->cutype;
    ca->role = priv->role;
    ca->status = priv->status;
    ca->rsvp = priv->rsvp;
    ca->delto = string_is_set (priv->delto) ? priv->delto : NULL;
    ca->delfrom = string_is_set (priv->delfrom) ? priv->delfrom : NULL;
    ca->sentby = string_is_set (priv->sentby) ? priv->sentby : NULL;
    ca->cn = string_is_set (priv->cn) ? priv->cn : NULL;
    ca->language = string_is_set (priv->language) ? priv->language : NULL;

    return ca;
}


const gchar *
e_meeting_attendee_get_address (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    return priv->address;
}

void
e_meeting_attendee_set_address (EMeetingAttendee *ia, gchar *address)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    if (priv->address != NULL)
        g_free (priv->address);
    
    priv->address = string_test (address);

    notify_changed (ia);
}

gboolean
e_meeting_attendee_is_set_address (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    return string_is_set (priv->address);
}

const gchar *
e_meeting_attendee_get_member (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    return priv->member;
}

void
e_meeting_attendee_set_member (EMeetingAttendee *ia, gchar *member)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    if (priv->member != NULL)
        g_free (priv->member);
    
    priv->member = string_test (member);

    notify_changed (ia);
}

gboolean
e_meeting_attendee_is_set_member (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;

    return string_is_set (priv->member);
}

icalparameter_cutype
e_meeting_attendee_get_cutype (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    return priv->cutype;
}

void 
e_meeting_attendee_set_cutype (EMeetingAttendee *ia, icalparameter_cutype cutype)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    priv->cutype = cutype;

    notify_changed (ia);
}

icalparameter_role
e_meeting_attendee_get_role (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    return priv->role;
}

void
e_meeting_attendee_set_role (EMeetingAttendee *ia, icalparameter_role role)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    priv->role = role;

    notify_changed (ia);
}

gboolean 
e_meeting_attendee_get_rsvp (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    return priv->rsvp;
}

void
e_meeting_attendee_set_rsvp (EMeetingAttendee *ia, gboolean rsvp)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    priv->rsvp = rsvp;

    notify_changed (ia);
}

const gchar *
e_meeting_attendee_get_delto (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    return priv->delto;
}

void
e_meeting_attendee_set_delto (EMeetingAttendee *ia, gchar *delto)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    if (priv->delto != NULL)
        g_free (priv->delto);
    
    priv->delto = string_test (delto);

    notify_changed (ia);
}

gboolean
e_meeting_attendee_is_set_delto (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;

    return string_is_set (priv->delto);
}

const gchar *
e_meeting_attendee_get_delfrom (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    return priv->delfrom;
}

void
e_meeting_attendee_set_delfrom (EMeetingAttendee *ia, gchar *delfrom)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    if (priv->delfrom != NULL)
        g_free (priv->delfrom);
    
    priv->delfrom = string_test (delfrom);

    notify_changed (ia);
}

gboolean
e_meeting_attendee_is_set_delfrom (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;

    return string_is_set (priv->delfrom);
}

icalparameter_partstat
e_meeting_attendee_get_status (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    return priv->status;
}

void
e_meeting_attendee_set_status (EMeetingAttendee *ia, icalparameter_partstat status)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    priv->status = status;

    notify_changed (ia);
}

const gchar *
e_meeting_attendee_get_sentby (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    return priv->sentby;
}

void
e_meeting_attendee_set_sentby (EMeetingAttendee *ia, gchar *sentby)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    if (priv->sentby != NULL)
        g_free (priv->sentby);
    
    priv->sentby = string_test (sentby);

    notify_changed (ia);
}

gboolean
e_meeting_attendee_is_set_sentby (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;

    return string_is_set (priv->sentby);
}

const gchar *
e_meeting_attendee_get_cn (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    return priv->cn;
}

void
e_meeting_attendee_set_cn (EMeetingAttendee *ia, gchar *cn)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    if (priv->cn != NULL)
        g_free (priv->cn);
    
    priv->cn = string_test (cn);

    notify_changed (ia);
}

gboolean
e_meeting_attendee_is_set_cn (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;

    return string_is_set (priv->cn);
}

const gchar *
e_meeting_attendee_get_language (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    return priv->language;
}

void
e_meeting_attendee_set_language (EMeetingAttendee *ia, gchar *language)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    if (priv->language != NULL)
        g_free (priv->language);
    
    priv->language = string_test (language);

    notify_changed (ia);
}

gboolean
e_meeting_attendee_is_set_language (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;

    return string_is_set (priv->language);
}

EMeetingAttendeeType
e_meeting_attendee_get_atype (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;

    if (priv->cutype == ICAL_CUTYPE_ROOM
        || priv->cutype == ICAL_CUTYPE_RESOURCE)
        return E_MEETING_ATTENDEE_RESOURCE;

    if (priv->role == ICAL_ROLE_CHAIR
        || priv->role == ICAL_ROLE_REQPARTICIPANT)
        return E_MEETING_ATTENDEE_REQUIRED_PERSON;
    
    return E_MEETING_ATTENDEE_OPTIONAL_PERSON;
}


EMeetingAttendeeEditLevel
e_meeting_attendee_get_edit_level (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    g_return_val_if_fail (ia != NULL, E_MEETING_ATTENDEE_EDIT_NONE);
    g_return_val_if_fail (E_IS_MEETING_ATTENDEE (ia), E_MEETING_ATTENDEE_EDIT_NONE);

    priv = ia->priv;

    return priv->edit_level;
}

void 
e_meeting_attendee_set_edit_level (EMeetingAttendee *ia, EMeetingAttendeeEditLevel level)
{
    EMeetingAttendeePrivate *priv;
    
    g_return_if_fail (ia != NULL);
    g_return_if_fail (E_IS_MEETING_ATTENDEE (ia));

    priv = ia->priv;

    priv->edit_level = level;
}


static gint
compare_times (EMeetingTime *time1,
           EMeetingTime *time2)
{
    gint day_comparison;

    day_comparison = g_date_compare (&time1->date,
                     &time2->date);
    if (day_comparison != 0)
        return day_comparison;

    if (time1->hour < time2->hour)
        return -1;
    if (time1->hour > time2->hour)
        return 1;

    if (time1->minute < time2->minute)
        return -1;
    if (time1->minute > time2->minute)
        return 1;

    /* The start times are exactly the same. */
    return 0;
}

static gint
compare_period_starts (const void *arg1,
               const void *arg2)
{
    EMeetingFreeBusyPeriod *period1, *period2;

    period1 = (EMeetingFreeBusyPeriod *) arg1;
    period2 = (EMeetingFreeBusyPeriod *) arg2;

    return compare_times (&period1->start, &period2->start);
}

static void
ensure_periods_sorted (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;

    if (priv->busy_periods_sorted)
        return;

    qsort (priv->busy_periods->data, priv->busy_periods->len,
           sizeof (EMeetingFreeBusyPeriod),
           compare_period_starts);

    priv->busy_periods_sorted = TRUE;
}

gboolean
e_meeting_attendee_get_has_calendar_info (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;

    return priv->has_calendar_info;
}

void
e_meeting_attendee_set_has_calendar_info (EMeetingAttendee *ia, gboolean has_calendar_info)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;

    priv->has_calendar_info = has_calendar_info;
}

const GArray *
e_meeting_attendee_get_busy_periods (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;

    ensure_periods_sorted (ia);
    
    return priv->busy_periods;  
}

gint
e_meeting_attendee_find_first_busy_period (EMeetingAttendee *ia, GDate *date)
{
    EMeetingAttendeePrivate *priv;
    EMeetingFreeBusyPeriod *period;
    gint lower, upper, middle = 0, cmp = 0;
    GDate tmp_date;

    priv = ia->priv;
    
    /* Make sure the busy periods have been sorted. */
    ensure_periods_sorted (ia);

    /* Calculate the first day which could have a busy period which
       continues onto our given date. */
    tmp_date = *date;
    g_date_subtract_days (&tmp_date, priv->longest_period_in_days);

    /* We want the first busy period which starts on tmp_date. */
    lower = 0;
    upper = priv->busy_periods->len;

    if (upper == 0)
        return -1;

    while (lower < upper) {
        middle = (lower + upper) >> 1;
      
        period = &g_array_index (priv->busy_periods,
                     EMeetingFreeBusyPeriod, middle);

        cmp = g_date_compare (&tmp_date, &period->start.date);
      
        if (cmp == 0)
            break;
        else if (cmp < 0)
            upper = middle;
        else
            lower = middle + 1;
    }

    /* There may be several busy periods on the same day so we step
       backwards to the first one. */
    if (cmp == 0) {
        while (middle > 0) {
            period = &g_array_index (priv->busy_periods,
                         EMeetingFreeBusyPeriod, middle - 1);
            if (g_date_compare (&tmp_date, &period->start.date) != 0)
                break;
            middle--;
        }
    } else if (cmp > 0) {
        /* This means we couldn't find a period on the given day, and
           the last one we looked at was before it, so if there are
           any more periods after this one we return it. */
        middle++;
        if (priv->busy_periods->len <= middle)
            return -1;
    }

    return middle;
}

gboolean
e_meeting_attendee_add_busy_period (EMeetingAttendee *ia, 
                    gint start_year,
                    gint start_month,
                    gint start_day,
                    gint start_hour,
                    gint start_minute,
                    gint end_year,
                    gint end_month,
                    gint end_day,
                    gint end_hour,
                    gint end_minute,
                    EMeetingFreeBusyType busy_type)
{
    EMeetingAttendeePrivate *priv;
    EMeetingFreeBusyPeriod period;
    gint period_in_days;

    g_return_val_if_fail (ia != NULL, FALSE);
    g_return_val_if_fail (E_IS_MEETING_ATTENDEE (ia), FALSE);
    g_return_val_if_fail (busy_type >= 0, FALSE);
    g_return_val_if_fail (busy_type < E_MEETING_FREE_BUSY_LAST, FALSE);

    priv = ia->priv;
    
    /* Check the dates are valid. */
    if (!g_date_valid_dmy (start_day, start_month, start_year))
        return FALSE;
    if (!g_date_valid_dmy (end_day, end_month, end_year))
        return FALSE;
    if (start_hour < 0 || start_hour > 23)
        return FALSE;
    if (end_hour < 0 || end_hour > 23)
        return FALSE;
    if (start_minute < 0 || start_minute > 59)
        return FALSE;
    if (end_minute < 0 || end_minute > 59)
        return FALSE;

    g_date_clear (&period.start.date, 1);
    g_date_clear (&period.end.date, 1);
    g_date_set_dmy (&period.start.date, start_day, start_month, start_year);
    g_date_set_dmy (&period.end.date, end_day, end_month, end_year);
    period.start.hour = start_hour;
    period.start.minute = start_minute;
    period.end.hour = end_hour;
    period.end.minute = end_minute;
    period.busy_type = busy_type;

    /* Check that the start time is before or equal to the end time. */
    if (compare_times (&period.start, &period.end) > 0)
        return FALSE;

    /* If the busy range is not set elsewhere, track it as best we can */
    if (!priv->start_busy_range_set) {
        if (!g_date_valid (&priv->busy_periods_start.date)) {
            priv->busy_periods_start.date = period.start.date;
            priv->busy_periods_start.hour = period.start.hour;
            priv->busy_periods_start.minute = period.start.minute;          
        } else {
            switch (g_date_compare (&period.start.date, &priv->busy_periods_start.date)) {
            case -1:
                priv->busy_periods_start.date = period.start.date;
                priv->busy_periods_start.hour = period.start.hour;
                priv->busy_periods_start.minute = period.start.minute;          
                break;
            case 0:
                if (period.start.hour < priv->busy_periods_start.hour
                    || (period.start.hour == priv->busy_periods_start.hour
                    && period.start.minute < priv->busy_periods_start.minute)) {
                    priv->busy_periods_start.date = period.start.date;
                    priv->busy_periods_start.hour = period.start.hour;
                    priv->busy_periods_start.minute = period.start.minute;          
                    break;
                }
                break;
            }
        }
    }
    if (!priv->end_busy_range_set) {
        if (!g_date_valid (&priv->busy_periods_end.date)) {
            priv->busy_periods_end.date = period.end.date;
            priv->busy_periods_end.hour = period.end.hour;
            priv->busy_periods_end.minute = period.end.minute;          
        } else {
            switch (g_date_compare (&period.end.date, &priv->busy_periods_end.date)) {
            case 0:
                if (period.end.hour > priv->busy_periods_end.hour
                    || (period.end.hour == priv->busy_periods_end.hour
                    && period.end.minute > priv->busy_periods_end.minute)) {
                    priv->busy_periods_end.date = period.end.date;
                    priv->busy_periods_end.hour = period.end.hour;
                    priv->busy_periods_end.minute = period.end.minute;          
                    break;
                }
                break;
            case 1:
                priv->busy_periods_end.date = period.end.date;
                priv->busy_periods_end.hour = period.end.hour;
                priv->busy_periods_end.minute = period.end.minute;          
                break;
            }
        }
    }
    
    g_array_append_val (priv->busy_periods, period);
    priv->has_calendar_info = TRUE;
    priv->busy_periods_sorted = FALSE;

    period_in_days = g_date_get_julian (&period.end.date) - g_date_get_julian (&period.start.date) + 1;
    priv->longest_period_in_days = MAX (priv->longest_period_in_days, period_in_days);

    return TRUE;
}

EMeetingTime
e_meeting_attendee_get_start_busy_range (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;

    return priv->busy_periods_start;
}

EMeetingTime
e_meeting_attendee_get_end_busy_range (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;
    
    priv = ia->priv;
    
    return priv->busy_periods_end;
}

gboolean
e_meeting_attendee_set_start_busy_range (EMeetingAttendee *ia,
                     gint start_year,
                     gint start_month,
                     gint start_day,
                     gint start_hour,
                     gint start_minute)
{
    EMeetingAttendeePrivate *priv;
    
    g_return_val_if_fail (E_IS_MEETING_ATTENDEE (ia), FALSE);

    priv = ia->priv;
    
    /* Check the dates are valid. */
    if (!g_date_valid_dmy (start_day, start_month, start_year))
        return FALSE;
    if (start_hour < 0 || start_hour > 23)
        return FALSE;
    if (start_minute < 0 || start_minute > 59)
        return FALSE;

    g_date_clear (&priv->busy_periods_start.date, 1);
    g_date_set_dmy (&priv->busy_periods_start.date,
            start_day, start_month, start_year);
    priv->busy_periods_start.hour = start_hour;
    priv->busy_periods_start.minute = start_minute;

    priv->start_busy_range_set = TRUE;
    
    return TRUE;
}

gboolean
e_meeting_attendee_set_end_busy_range (EMeetingAttendee *ia,
                       gint end_year,
                       gint end_month,
                       gint end_day,
                       gint end_hour,
                       gint end_minute)
{
    EMeetingAttendeePrivate *priv;
    
    g_return_val_if_fail (E_IS_MEETING_ATTENDEE (ia), FALSE);

    priv = ia->priv;
    
    /* Check the dates are valid. */
    if (!g_date_valid_dmy (end_day, end_month, end_year))
        return FALSE;
    if (end_hour < 0 || end_hour > 23)
        return FALSE;
    if (end_minute < 0 || end_minute > 59)
        return FALSE;

    g_date_clear (&priv->busy_periods_end.date, 1);
    g_date_set_dmy (&priv->busy_periods_end.date,
            end_day, end_month, end_year);
    priv->busy_periods_end.hour = end_hour;
    priv->busy_periods_end.minute = end_minute;

    priv->end_busy_range_set = TRUE;
    
    return TRUE;
}

/* Clears all busy times for the given attendee. */
void
e_meeting_attendee_clear_busy_periods (EMeetingAttendee *ia)
{
    EMeetingAttendeePrivate *priv;

    g_return_if_fail (E_IS_MEETING_ATTENDEE (ia));

    priv = ia->priv;
    
    g_array_set_size (priv->busy_periods, 0);
    priv->busy_periods_sorted = TRUE;

    g_date_clear (&priv->busy_periods_start.date, 1);
    priv->busy_periods_start.hour = 0;
    priv->busy_periods_start.minute = 0;

    g_date_clear (&priv->busy_periods_end.date, 1);
    priv->busy_periods_end.hour = 0;
    priv->busy_periods_end.minute = 0;

    priv->longest_period_in_days = 0;
}