path: root/addressbook/gui/widgets/e-addressbook-model.c

/*
 * 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 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Christopher James Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <string.h>
#include <glib/gi18n.h>
#include "e-addressbook-model.h"
#include <e-util/e-marshal.h>
#include <e-util/e-util.h>
#include "eab-gui-util.h"

#define E_ADDRESSBOOK_MODEL_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_ADDRESSBOOK_MODEL, EAddressbookModelPrivate))

struct _EAddressbookModelPrivate {
    EBookClient *book_client;
    gchar *query_str;
    EBookClientView *client_view;
    guint client_view_idle_id;

    /* Query Results */
    GPtrArray *contacts;

    /* Signal Handler IDs */
    gulong create_contact_id;
    gulong remove_contact_id;
    gulong modify_contact_id;
    gulong status_message_id;
    gulong writable_status_id;
    gulong view_complete_id;
    gulong backend_died_id;
    guint remove_status_id;

    guint search_in_progress    : 1;
    guint editable          : 1;
    guint first_get_view        : 1;
};

enum {
    PROP_0,
    PROP_CLIENT,
    PROP_EDITABLE,
    PROP_QUERY
};

enum {
    WRITABLE_STATUS,
    STATUS_MESSAGE,
    SEARCH_STARTED,
    SEARCH_RESULT,
    FOLDER_BAR_MESSAGE,
    CONTACT_ADDED,
    CONTACTS_REMOVED,
    CONTACT_CHANGED,
    MODEL_CHANGED,
    STOP_STATE_CHANGED,
    BACKEND_DIED,
    LAST_SIGNAL
};

static gpointer parent_class;
static guint signals[LAST_SIGNAL];

G_DEFINE_TYPE (EAddressbookModel, e_addressbook_model, G_TYPE_OBJECT)

static void
free_data (EAddressbookModel *model)
{
    GPtrArray *array;

    array = model->priv->contacts;
    g_ptr_array_foreach (array, (GFunc) g_object_unref, NULL);
    g_ptr_array_set_size (array, 0);
}

static void
remove_book_view (EAddressbookModel *model)
{
    if (model->priv->client_view && model->priv->create_contact_id)
        g_signal_handler_disconnect (
            model->priv->client_view,
            model->priv->create_contact_id);
    if (model->priv->client_view && model->priv->remove_contact_id)
        g_signal_handler_disconnect (
            model->priv->client_view,
            model->priv->remove_contact_id);
    if (model->priv->client_view && model->priv->modify_contact_id)
        g_signal_handler_disconnect (
            model->priv->client_view,
            model->priv->modify_contact_id);
    if (model->priv->client_view && model->priv->status_message_id)
        g_signal_handler_disconnect (
            model->priv->client_view,
            model->priv->status_message_id);
    if (model->priv->client_view && model->priv->view_complete_id)
        g_signal_handler_disconnect (
            model->priv->client_view,
            model->priv->view_complete_id);
    if (model->priv->remove_status_id)
        g_source_remove (model->priv->remove_status_id);

    model->priv->create_contact_id = 0;
    model->priv->remove_contact_id = 0;
    model->priv->modify_contact_id = 0;
    model->priv->status_message_id = 0;
    model->priv->view_complete_id = 0;
    model->priv->remove_status_id = 0;

    model->priv->search_in_progress = FALSE;

    if (model->priv->client_view) {
        GError *error = NULL;

        e_book_client_view_stop (model->priv->client_view, &error);

        if (error != NULL) {
            g_warning (
                "%s: Failed to stop client view: %s",
                G_STRFUNC, error->message);
            g_error_free (error);
        }

        g_object_unref (model->priv->client_view);
        model->priv->client_view = NULL;

        g_signal_emit (model, signals[STATUS_MESSAGE], 0, NULL, -1);
    }
}

static void
update_folder_bar_message (EAddressbookModel *model)
{
    guint count;
    gchar *message;

    count = model->priv->contacts->len;

    switch (count) {
    case 0:
        message = g_strdup (_("No contacts"));
        break;
    default:
        message = g_strdup_printf (
            ngettext ("%d contact", "%d contacts", count), count);
        break;
    }

    g_signal_emit (model, signals[FOLDER_BAR_MESSAGE], 0, message);

    g_free (message);
}

static void
view_create_contact_cb (EBookClientView *client_view,
                        const GSList *contact_list,
                        EAddressbookModel *model)
{
    GPtrArray *array;
    guint count;
    guint index;

    array = model->priv->contacts;
    index = array->len;
    count = g_list_length ((GList *) contact_list);

    while (contact_list != NULL) {
        EContact *contact = contact_list->data;

        g_ptr_array_add (array, g_object_ref (contact));
        contact_list = contact_list->next;
    }

    g_signal_emit (model, signals[CONTACT_ADDED], 0, index, count);
    update_folder_bar_message (model);
}

static gint
sort_descending (gconstpointer ca,
                 gconstpointer cb)
{
    gint a = *((gint *) ca);
    gint b = *((gint *) cb);

    return (a == b) ? 0 : (a < b) ? 1 : -1;
}

static void
view_remove_contact_cb (EBookClientView *client_view,
                        const GSList *ids,
                        EAddressbookModel *model)
{
    /* XXX we should keep a hash around instead of this O(n*m) loop */
    const GSList *iter;
    GArray *indices;
    GPtrArray *array;
    gint ii;

    array = model->priv->contacts;
    indices = g_array_new (FALSE, FALSE, sizeof (gint));

    for (iter = ids; iter != NULL; iter = iter->next) {
        const gchar *target_uid = iter->data;

        for (ii = 0; ii < array->len; ii++) {
            EContact *contact;
            const gchar *uid;

            contact = array->pdata[ii];
            /* check if already removed */
            if (!contact)
                continue;

            uid = e_contact_get_const (contact, E_CONTACT_UID);
            g_return_if_fail (uid != NULL);

            if (strcmp (uid, target_uid) == 0) {
                g_object_unref (contact);
                g_array_append_val (indices, ii);
                array->pdata[ii] = NULL;
                break;
            }
        }
    }

    /* Sort the 'indices' array in descending order, since
     * g_ptr_array_remove_index() shifts subsequent elements
     * down one position to fill the gap. */
    g_array_sort (indices, sort_descending);

    for (ii = 0; ii < indices->len; ii++) {
        gint index;

        index = g_array_index (indices, gint, ii);
        g_ptr_array_remove_index (array, index);
    }

    g_signal_emit (model, signals[CONTACTS_REMOVED], 0, indices);
    g_array_free (indices, FALSE);

    update_folder_bar_message (model);
}

static void
view_modify_contact_cb (EBookClientView *client_view,
                        const GSList *contact_list,
                        EAddressbookModel *model)
{
    GPtrArray *array;

    array = model->priv->contacts;

    while (contact_list != NULL) {
        EContact *new_contact = contact_list->data;
        const gchar *target_uid;
        gint ii;

        target_uid = e_contact_get_const (new_contact, E_CONTACT_UID);

        for (ii = 0; ii < array->len; ii++) {
            EContact *old_contact;
            const gchar *uid;

            old_contact = array->pdata[ii];
            g_return_if_fail (old_contact != NULL);

            uid = e_contact_get_const (old_contact, E_CONTACT_UID);
            g_return_if_fail (uid != NULL);

            if (strcmp (uid, target_uid) != 0)
                continue;

            g_object_unref (old_contact);
            array->pdata[ii] = e_contact_duplicate (new_contact);

            g_signal_emit (
                model, signals[CONTACT_CHANGED], 0, ii);
            break;
        }

        contact_list = contact_list->next;
    }
}

static void
view_progress_cb (EBookClientView *client_view,
                  guint percent,
                  const gchar *message,
                  EAddressbookModel *model)
{
    if (model->priv->remove_status_id)
        g_source_remove (model->priv->remove_status_id);
    model->priv->remove_status_id = 0;

    g_signal_emit (model, signals[STATUS_MESSAGE], 0, message, percent);
}

static void
view_complete_cb (EBookClientView *client_view,
                  const GError *error,
                  EAddressbookModel *model)
{
    model->priv->search_in_progress = FALSE;
    view_progress_cb (client_view, -1, NULL, model);
    g_signal_emit (model, signals[SEARCH_RESULT], 0, error);
    g_signal_emit (model, signals[STOP_STATE_CHANGED], 0);
}

static void
readonly_cb (EBookClient *book_client,
             GParamSpec *pspec,
             EAddressbookModel *model)
{
    gboolean editable;

    editable = !e_client_is_readonly (E_CLIENT (book_client));
    e_addressbook_model_set_editable (model, editable);
}

static void
backend_died_cb (EBookClient *book_client,
                 EAddressbookModel *model)
{
    g_signal_emit (model, signals[BACKEND_DIED], 0);
}

static void
client_view_ready_cb (GObject *source_object,
                      GAsyncResult *result,
                      gpointer user_data)
{
    EBookClient *book_client = E_BOOK_CLIENT (source_object);
    EBookClientView *client_view = NULL;
    EAddressbookModel *model = user_data;
    GError *error = NULL;

    if (!e_book_client_get_view_finish (book_client, result, &client_view, &error))
        client_view = NULL;

    if (error) {
        eab_error_dialog (NULL, _("Error getting book view"), error);
        g_error_free (error);
        return;
    }

    remove_book_view (model);
    free_data (model);

    model->priv->client_view = client_view;
    if (model->priv->client_view) {
        model->priv->create_contact_id = g_signal_connect (
            model->priv->client_view, "objects-added",
            G_CALLBACK (view_create_contact_cb), model);
        model->priv->remove_contact_id = g_signal_connect (
            model->priv->client_view, "objects-removed",
            G_CALLBACK (view_remove_contact_cb), model);
        model->priv->modify_contact_id = g_signal_connect (
            model->priv->client_view, "objects-modified",
            G_CALLBACK (view_modify_contact_cb), model);
        model->priv->status_message_id = g_signal_connect (
            model->priv->client_view, "progress",
            G_CALLBACK (view_progress_cb), model);
        model->priv->view_complete_id = g_signal_connect (
            model->priv->client_view, "complete",
            G_CALLBACK (view_complete_cb), model);

        model->priv->search_in_progress = TRUE;
    }

    g_signal_emit (model, signals[MODEL_CHANGED], 0);
    g_signal_emit (model, signals[SEARCH_STARTED], 0);
    g_signal_emit (model, signals[STOP_STATE_CHANGED], 0);

    if (model->priv->client_view) {
        e_book_client_view_start (model->priv->client_view, &error);

        if (error != NULL) {
            g_warning (
                "%s: Failed to start client view: %s",
                G_STRFUNC, error->message);
            g_error_free (error);
        }
    }
}

static gboolean
addressbook_model_idle_cb (EAddressbookModel *model)
{
    model->priv->client_view_idle_id = 0;

    if (model->priv->book_client && model->priv->query_str) {
        remove_book_view (model);

        if (model->priv->first_get_view) {
            model->priv->first_get_view = FALSE;

            if (e_client_check_capability (E_CLIENT (model->priv->book_client), "do-initial-query")) {
                e_book_client_get_view (
                    model->priv->book_client, model->priv->query_str,
                    NULL, client_view_ready_cb, model);
            } else {
                free_data (model);

                g_signal_emit (
                    model, signals[MODEL_CHANGED], 0);
                g_signal_emit (
                    model, signals[STOP_STATE_CHANGED], 0);
            }
        } else
            e_book_client_get_view (
                model->priv->book_client, model->priv->query_str,
                NULL, client_view_ready_cb, model);

    }

    g_object_unref (model);

    return FALSE;
}

static gboolean
remove_status_cb (gpointer data)
{
    EAddressbookModel *model = data;

    g_return_val_if_fail (model != NULL, FALSE);
    g_return_val_if_fail (E_IS_ADDRESSBOOK_MODEL (model), FALSE);

    g_signal_emit (model, signals[STATUS_MESSAGE], 0, NULL, -1);
    model->priv->remove_status_id = 0;

    return FALSE;
}

static void
addressbook_model_set_property (GObject *object,
                                guint property_id,
                                const GValue *value,
                                GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_CLIENT:
            e_addressbook_model_set_client (
                E_ADDRESSBOOK_MODEL (object),
                g_value_get_object (value));
            return;

        case PROP_EDITABLE:
            e_addressbook_model_set_editable (
                E_ADDRESSBOOK_MODEL (object),
                g_value_get_boolean (value));
            return;

        case PROP_QUERY:
            e_addressbook_model_set_query (
                E_ADDRESSBOOK_MODEL (object),
                g_value_get_string (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);

}

static void
addressbook_model_get_property (GObject *object,
                                guint property_id,
                                GValue *value,
                                GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_CLIENT:
            g_value_set_object (
                value, e_addressbook_model_get_client (
                E_ADDRESSBOOK_MODEL (object)));
            return;

        case PROP_EDITABLE:
            g_value_set_boolean (
                value, e_addressbook_model_get_editable (
                E_ADDRESSBOOK_MODEL (object)));
            return;

        case PROP_QUERY:
            g_value_set_string (
                value, e_addressbook_model_get_query (
                E_ADDRESSBOOK_MODEL (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
addressbook_model_dispose (GObject *object)
{
    EAddressbookModel *model = E_ADDRESSBOOK_MODEL (object);

    remove_book_view (model);
    free_data (model);

    if (model->priv->book_client) {
        if (model->priv->writable_status_id)
            g_signal_handler_disconnect (
                model->priv->book_client,
                model->priv->writable_status_id);
        model->priv->writable_status_id = 0;

        if (model->priv->backend_died_id)
            g_signal_handler_disconnect (
                model->priv->book_client,
                model->priv->backend_died_id);
        model->priv->backend_died_id = 0;

        g_object_unref (model->priv->book_client);
        model->priv->book_client = NULL;
    }

    if (model->priv->query_str) {
        g_free (model->priv->query_str);
        model->priv->query_str = NULL;
    }

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (parent_class)->dispose (object);
}

static void
addressbook_model_finalize (GObject *object)
{
    EAddressbookModelPrivate *priv;

    priv = E_ADDRESSBOOK_MODEL_GET_PRIVATE (object);

    g_ptr_array_free (priv->contacts, TRUE);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
e_addressbook_model_class_init (EAddressbookModelClass *class)
{
    GObjectClass *object_class;

    parent_class = g_type_class_peek_parent (class);
    g_type_class_add_private (class, sizeof (EAddressbookModelPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = addressbook_model_set_property;
    object_class->get_property = addressbook_model_get_property;
    object_class->dispose = addressbook_model_dispose;
    object_class->finalize = addressbook_model_finalize;

    g_object_class_install_property (
        object_class,
        PROP_CLIENT,
        g_param_spec_object (
            "client",
            "EBookClient",
            NULL,
            E_TYPE_BOOK_CLIENT,
            G_PARAM_READWRITE |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_EDITABLE,
        g_param_spec_boolean (
            "editable",
            "Editable",
            NULL,
            FALSE,
            G_PARAM_READWRITE |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_QUERY,
        g_param_spec_string (
            "query",
            "Query",
            NULL,
            NULL,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT |
            G_PARAM_STATIC_STRINGS));

    signals[WRITABLE_STATUS] =
        g_signal_new ("writable_status",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EAddressbookModelClass, writable_status),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__BOOLEAN,
                  G_TYPE_NONE,
                  1, G_TYPE_BOOLEAN);

    signals[STATUS_MESSAGE] =
        g_signal_new ("status_message",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EAddressbookModelClass, status_message),
                  NULL, NULL,
                  e_marshal_VOID__STRING_INT,
                  G_TYPE_NONE,
                  2, G_TYPE_STRING, G_TYPE_INT);

    signals[SEARCH_STARTED] =
        g_signal_new ("search_started",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EAddressbookModelClass, search_started),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE, 0);

    signals[SEARCH_RESULT] =
        g_signal_new ("search_result",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EAddressbookModelClass, search_result),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__BOXED,
                  G_TYPE_NONE, 1, G_TYPE_ERROR);

    signals[FOLDER_BAR_MESSAGE] =
        g_signal_new ("folder_bar_message",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EAddressbookModelClass, folder_bar_message),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__POINTER,
                  G_TYPE_NONE, 1, G_TYPE_POINTER);

    signals[CONTACT_ADDED] =
        g_signal_new ("contact_added",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EAddressbookModelClass, contact_added),
                  NULL, NULL,
                  e_marshal_NONE__INT_INT,
                  G_TYPE_NONE, 2, G_TYPE_INT, G_TYPE_INT);

    signals[CONTACTS_REMOVED] =
        g_signal_new ("contacts_removed",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EAddressbookModelClass, contacts_removed),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__POINTER,
                  G_TYPE_NONE, 1, G_TYPE_POINTER);

    signals[CONTACT_CHANGED] =
        g_signal_new ("contact_changed",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EAddressbookModelClass, contact_changed),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__INT,
                  G_TYPE_NONE, 1, G_TYPE_INT);

    signals[MODEL_CHANGED] =
        g_signal_new ("model_changed",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EAddressbookModelClass, model_changed),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE, 0);

    signals[STOP_STATE_CHANGED] =
        g_signal_new ("stop_state_changed",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EAddressbookModelClass, stop_state_changed),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE, 0);

    signals[BACKEND_DIED] =
        g_signal_new ("backend_died",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EAddressbookModelClass, backend_died),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE, 0);
}

static void
e_addressbook_model_init (EAddressbookModel *model)
{
    model->priv = E_ADDRESSBOOK_MODEL_GET_PRIVATE (model);
    model->priv->contacts = g_ptr_array_new ();
    model->priv->first_get_view = TRUE;
}

EAddressbookModel *
e_addressbook_model_new (void)
{
    return g_object_new (E_TYPE_ADDRESSBOOK_MODEL, NULL);
}

EContact *
e_addressbook_model_get_contact (EAddressbookModel *model,
                                 gint row)
{
    GPtrArray *array;

    g_return_val_if_fail (E_IS_ADDRESSBOOK_MODEL (model), NULL);

    array = model->priv->contacts;

    if (0 <= row && row < array->len)
        return e_contact_duplicate (array->pdata[row]);

    return NULL;
}

void
e_addressbook_model_stop (EAddressbookModel *model)
{
    const gchar *message;

    g_return_if_fail (E_IS_ADDRESSBOOK_MODEL (model));

    remove_book_view (model);

    message = _("Search Interrupted");
    g_signal_emit (model, signals[STOP_STATE_CHANGED], 0);
    g_signal_emit (model, signals[STATUS_MESSAGE], 0, message, -1);

    if (!model->priv->remove_status_id)
        model->priv->remove_status_id =
            g_timeout_add_seconds (3, remove_status_cb, model);
}

gboolean
e_addressbook_model_can_stop (EAddressbookModel *model)
{
    g_return_val_if_fail (E_IS_ADDRESSBOOK_MODEL (model), FALSE);

    return model->priv->search_in_progress;
}

void
e_addressbook_model_force_folder_bar_message (EAddressbookModel *model)
{
    g_return_if_fail (E_IS_ADDRESSBOOK_MODEL (model));

    update_folder_bar_message (model);
}

gint
e_addressbook_model_contact_count (EAddressbookModel *model)
{
    g_return_val_if_fail (E_IS_ADDRESSBOOK_MODEL (model), 0);

    return model->priv->contacts->len;
}

EContact *
e_addressbook_model_contact_at (EAddressbookModel *model,
                                gint index)
{
    g_return_val_if_fail (E_IS_ADDRESSBOOK_MODEL (model), NULL);

    return model->priv->contacts->pdata[index];
}

gint
e_addressbook_model_find (EAddressbookModel *model,
                          EContact *contact)
{
    GPtrArray *array;
    gint ii;

    /* XXX This searches for a particular EContact instance,
     *     as opposed to an equivalent but possibly different
     *     EContact instance.  Might have to revise this in
     *     the future. */

    g_return_val_if_fail (E_IS_ADDRESSBOOK_MODEL (model), -1);
    g_return_val_if_fail (E_IS_CONTACT (contact), -1);

    array = model->priv->contacts;
    for (ii = 0; ii < array->len; ii++) {
        EContact *candidate = array->pdata[ii];

        if (contact == candidate)
            return ii;
    }

    return -1;
}

EBookClient *
e_addressbook_model_get_client (EAddressbookModel *model)
{
    g_return_val_if_fail (E_IS_ADDRESSBOOK_MODEL (model), NULL);

    return model->priv->book_client;
}

void
e_addressbook_model_set_client (EAddressbookModel *model,
                                EBookClient *book_client)
{
    gboolean editable;

    g_return_if_fail (E_IS_ADDRESSBOOK_MODEL (model));
    g_return_if_fail (E_IS_BOOK_CLIENT (book_client));

    if (model->priv->book_client != NULL) {
        if (model->priv->book_client == book_client)
            return;

        if (model->priv->writable_status_id != 0)
            g_signal_handler_disconnect (
                model->priv->book_client,
                model->priv->writable_status_id);
        model->priv->writable_status_id = 0;

        if (model->priv->backend_died_id != 0)
            g_signal_handler_disconnect (
                model->priv->book_client,
                model->priv->backend_died_id);
        model->priv->backend_died_id = 0;

        g_object_unref (model->priv->book_client);
    }

    model->priv->book_client = g_object_ref (book_client);
    model->priv->first_get_view = TRUE;

    model->priv->writable_status_id = g_signal_connect (
        book_client, "notify::readonly",
        G_CALLBACK (readonly_cb), model);

    model->priv->backend_died_id = g_signal_connect (
        book_client, "backend-died",
        G_CALLBACK (backend_died_cb), model);

    editable = !e_client_is_readonly (E_CLIENT (book_client));
    e_addressbook_model_set_editable (model, editable);

    if (model->priv->client_view_idle_id == 0)
        model->priv->client_view_idle_id = g_idle_add (
            (GSourceFunc) addressbook_model_idle_cb,
            g_object_ref (model));

    g_object_notify (G_OBJECT (model), "client");
}

gboolean
e_addressbook_model_get_editable (EAddressbookModel *model)
{
    g_return_val_if_fail (E_IS_ADDRESSBOOK_MODEL (model), FALSE);

    return model->priv->editable;
}

void
e_addressbook_model_set_editable (EAddressbookModel *model,
                                  gboolean editable)
{
    g_return_if_fail (E_IS_ADDRESSBOOK_MODEL (model));

    if ((model->priv->editable ? 1 : 0) != (editable ? 1 : 0)) {
        model->priv->editable = editable;

        g_signal_emit (
            model, signals[WRITABLE_STATUS], 0,
            model->priv->editable);

        g_object_notify (G_OBJECT (model), "editable");
    }
}

gchar *
e_addressbook_model_get_query (EAddressbookModel *model)
{
    g_return_val_if_fail (E_IS_ADDRESSBOOK_MODEL (model), NULL);

    return model->priv->query_str;
}

void
e_addressbook_model_set_query (EAddressbookModel *model,
                               const gchar *query)
{
    EBookQuery *book_query;

    g_return_if_fail (E_IS_ADDRESSBOOK_MODEL (model));

    if (query == NULL)
        book_query = e_book_query_any_field_contains ("");
    else
        book_query = e_book_query_from_string (query);

    /* also checks whether the query is a valid query string */
    if (!book_query)
        return;

    if (model->priv->query_str != NULL) {
        gchar *new_query;

        new_query = e_book_query_to_string (book_query);

        if (new_query && g_str_equal (model->priv->query_str, new_query)) {
            g_free (new_query);
            e_book_query_unref (book_query);
            return;
        }

        g_free (new_query);
    }

    g_free (model->priv->query_str);
    model->priv->query_str = e_book_query_to_string (book_query);
    e_book_query_unref (book_query);

    if (model->priv->client_view_idle_id == 0)
        model->priv->client_view_idle_id = g_idle_add (
            (GSourceFunc) addressbook_model_idle_cb,
            g_object_ref (model));

    g_object_notify (G_OBJECT (model), "query");
}