path: root/shell/e-component-registry.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-component-registry.c
 *
 * Copyright (C) 2000  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: Ettore Perazzoli
 */

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

#include "e-component-registry.h"

#include <glib.h>
#include <gtk/gtktypeutils.h>

#include <gal/util/e-util.h>

#include "Evolution.h"

#include "e-shell-utils.h"
#include "evolution-shell-component-client.h"


#define PARENT_TYPE GTK_TYPE_OBJECT
static GtkObjectClass *parent_class = NULL;

typedef struct _Component Component;

struct _Component {
    char *id;
    
    EvolutionShellComponentClient *client;

    /* Names of the folder types we support (normal ASCII strings).  */
    GList *folder_type_names;
};

struct _EComponentRegistryPrivate {
    EShell *shell;

    GHashTable *component_id_to_component;
};


/* Utility functions.  */

static int
sleep_with_g_main_loop_timeout_callback (void *data)
{
    GMainLoop *loop;

    loop = (GMainLoop *) data;
    g_main_quit (loop);

    return FALSE;
}

/* This function is like `sleep()', but it uses the GMainLoop so CORBA
   invocations can get through.  */
static void
sleep_with_g_main_loop (int num_seconds)
{
    GMainLoop *loop;

    loop = g_main_new (TRUE);
    g_timeout_add (1000 * num_seconds, sleep_with_g_main_loop_timeout_callback, loop);
    g_main_run (loop);
    g_main_destroy (loop);
}

static void
wait_for_corba_object_to_die (Bonobo_Unknown corba_objref,
                  const char *id)
{
    gboolean alive;
    int count;

    count = 1;
    while (1) {
        alive = bonobo_unknown_ping (corba_objref);
        if (! alive)
            break;

        g_print ("Waiting for component to die -- %s (%d)\n", id, count);
        sleep_with_g_main_loop (1);
        count ++;
    }
}


/* Component information handling.  */

static Component *
component_new (const char *id,
           EvolutionShellComponentClient *client)
{
    Component *new;

    bonobo_object_ref (BONOBO_OBJECT (client));

    new = g_new (Component, 1);
    new->id                = g_strdup (id);
    new->folder_type_names = NULL;
    new->client            = client;

    return new;
}

static gboolean
component_free (Component *component)
{
    GNOME_Evolution_ShellComponent corba_shell_component;
    CORBA_Environment ev;
    gboolean retval;

    CORBA_exception_init (&ev);

    corba_shell_component = bonobo_object_corba_objref (BONOBO_OBJECT (component->client));
    corba_shell_component = CORBA_Object_duplicate (corba_shell_component, &ev);

    GNOME_Evolution_ShellComponent_unsetOwner (corba_shell_component, &ev);
    if (ev._major == CORBA_NO_EXCEPTION)
        retval = TRUE;
    else
        retval = FALSE;
    CORBA_exception_free (&ev);

    bonobo_object_unref (BONOBO_OBJECT (component->client));

    wait_for_corba_object_to_die ((Bonobo_Unknown) corba_shell_component, component->id);
    CORBA_Object_release (corba_shell_component, &ev);

    e_free_string_list (component->folder_type_names);
    g_free (component->id);

    g_free (component);

    return retval;
}

static gboolean
register_type (EComponentRegistry *component_registry,
           const char *name,
           const char *icon_name,
           const char *display_name,
           const char *description,
           gboolean user_creatable,
           int num_exported_dnd_types,
           const char **exported_dnd_types,
           int num_accepted_dnd_types,
           const char **accepted_dnd_types,
           Component *handler,
           gboolean override_duplicate)
{
    EComponentRegistryPrivate *priv;
    EFolderTypeRegistry *folder_type_registry;

    priv = component_registry->priv;

    folder_type_registry = e_shell_get_folder_type_registry (priv->shell);
    g_assert (folder_type_registry != NULL);

    if (override_duplicate
        && e_folder_type_register_type_registered (folder_type_registry, name))
        e_folder_type_register_unregister_type (folder_type_registry, name);

    if (! e_folder_type_registry_register_type (folder_type_registry,
                            name, icon_name, 
                            display_name, description,
                            user_creatable,
                            num_exported_dnd_types,
                            exported_dnd_types,
                            num_accepted_dnd_types,
                            accepted_dnd_types)) {
        g_warning ("Trying to register duplicate folder type -- %s", name);
        return FALSE;
    }

    e_folder_type_registry_set_handler_for_type (folder_type_registry, name, handler->client);

    return TRUE;
}

static gboolean
register_component (EComponentRegistry *component_registry,
            const char *id,
            gboolean override_duplicate)
{
    EComponentRegistryPrivate *priv;
    GNOME_Evolution_ShellComponent component_corba_interface;
    GNOME_Evolution_Shell shell_corba_interface;
    GNOME_Evolution_FolderTypeList *supported_types;
    GNOME_Evolution_URISchemaList *supported_schemas;
    Component *component;
    EvolutionShellComponentClient *client;
    CORBA_Environment ev;
    CORBA_unsigned_long i;

    priv = component_registry->priv;

    if (! override_duplicate && g_hash_table_lookup (priv->component_id_to_component, id) != NULL) {
        g_warning ("Trying to register component twice -- %s", id);
        return FALSE;
    }

    client = evolution_shell_component_client_new (id);
    if (client == NULL)
        return FALSE;

    CORBA_exception_init (&ev);

    /* FIXME we could use the EvolutionShellComponentClient API here instead, but for
           now we don't care.  */

    component_corba_interface = bonobo_object_corba_objref (BONOBO_OBJECT (client));
    shell_corba_interface = bonobo_object_corba_objref (BONOBO_OBJECT (priv->shell));

    /* Register the supported folder types.  */

    supported_types = GNOME_Evolution_ShellComponent__get_supportedTypes (component_corba_interface, &ev);
    if (ev._major != CORBA_NO_EXCEPTION || supported_types->_length == 0) {
        bonobo_object_unref (BONOBO_OBJECT (client));
        CORBA_exception_free (&ev);
        return FALSE;
    }

    CORBA_exception_free (&ev);

    component = component_new (id, client);
    g_hash_table_insert (priv->component_id_to_component, component->id, component);
    bonobo_object_unref (BONOBO_OBJECT (client));

    for (i = 0; i < supported_types->_length; i++) {
        const GNOME_Evolution_FolderType *type;

        type = supported_types->_buffer + i;

        if (! register_type (component_registry,
                     type->name, type->iconName, 
                     type->displayName, type->description,
                     type->userCreatable,
                     type->exportedDndTypes._length,
                     (const char **) type->exportedDndTypes._buffer,
                     type->acceptedDndTypes._length,
                     (const char **) type->acceptedDndTypes._buffer,
                     component,
                     override_duplicate)) {
            g_warning ("Cannot register type `%s' for component %s",
                   type->name, component->id);
        }
    }

    CORBA_free (supported_types);

    /* Register the supported external URI schemas.  */

    supported_schemas = GNOME_Evolution_ShellComponent__get_externalUriSchemas (component_corba_interface, &ev);
    if (ev._major == CORBA_NO_EXCEPTION) {
        EUriSchemaRegistry *uri_schema_registry;

        uri_schema_registry = e_shell_get_uri_schema_registry (priv->shell); 

        for (i = 0; i < supported_schemas->_length; i++) {
            const CORBA_char *schema;

            schema = supported_schemas->_buffer[i];
            e_uri_schema_registry_set_handler_for_schema (uri_schema_registry, schema, component->client);
        }

        CORBA_free (supported_schemas);
    }

    return TRUE;
}


/* GtkObject methods.  */

static void
component_id_foreach_free (void *key,
               void *value,
               void *user_data)
{
    Component *component;

    component = (Component *) value;
    component_free (component);
}

static void
destroy (GtkObject *object)
{
    EComponentRegistry *component_registry;
    EComponentRegistryPrivate *priv;

    component_registry = E_COMPONENT_REGISTRY (object);
    priv = component_registry->priv;

    g_hash_table_foreach (priv->component_id_to_component, component_id_foreach_free, NULL);
    g_hash_table_destroy (priv->component_id_to_component);

    g_free (priv);

    if (GTK_OBJECT_CLASS (parent_class)->destroy)
        (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}


static void
class_init (EComponentRegistryClass *klass)
{
    GtkObjectClass *object_class;

    object_class = GTK_OBJECT_CLASS (klass);
    object_class->destroy = destroy;

    parent_class = gtk_type_class (gtk_object_get_type ());
}


static void
init (EComponentRegistry *component_registry)
{
    EComponentRegistryPrivate *priv;

    priv = g_new (EComponentRegistryPrivate, 1);
    priv->shell                     = NULL;
    priv->component_id_to_component = g_hash_table_new (g_str_hash, g_str_equal);

    component_registry->priv = priv;
}


void
e_component_registry_construct (EComponentRegistry *component_registry,
                EShell *shell)
{
    EComponentRegistryPrivate *priv;

    g_return_if_fail (component_registry != NULL);
    g_return_if_fail (E_IS_COMPONENT_REGISTRY (component_registry));
    g_return_if_fail (shell != NULL);
    g_return_if_fail (E_IS_SHELL (shell));

    priv = component_registry->priv;
    priv->shell = shell;
}

EComponentRegistry *
e_component_registry_new (EShell *shell)
{
    EComponentRegistry *component_registry;

    g_return_val_if_fail (shell != NULL, NULL);
    g_return_val_if_fail (E_IS_SHELL (shell), NULL);

    component_registry = gtk_type_new (e_component_registry_get_type ());
    e_component_registry_construct (component_registry, shell);

    return component_registry;
}


gboolean
e_component_registry_register_component (EComponentRegistry *component_registry,
                     const char *id)
{
    g_return_val_if_fail (component_registry != NULL, FALSE);
    g_return_val_if_fail (E_IS_COMPONENT_REGISTRY (component_registry), FALSE);
    g_return_val_if_fail (id != NULL, FALSE);

    return register_component (component_registry, id, FALSE);
}


static void
compose_id_list_foreach (void *key,
             void *value,
             void *data)
{
    GList **listp;
    const char *id;

    listp = (GList **) data;
    id = (const char *) key;

    *listp = g_list_prepend (*listp, g_strdup (id));
}

/**
 * e_component_registry_get_id_list:
 * @component_registry: 
 * 
 * Get the list of components registered.
 * 
 * Return value: A GList of strings containining the IDs for all the registered
 * components.  The list must be freed by the caller when not used anymore.
 **/
GList *
e_component_registry_get_id_list (EComponentRegistry *component_registry)
{
    EComponentRegistryPrivate *priv;
    GList *list;

    g_return_val_if_fail (component_registry != NULL, NULL);
    g_return_val_if_fail (E_IS_COMPONENT_REGISTRY (component_registry), NULL);

    priv = component_registry->priv;
    list = NULL;

    g_hash_table_foreach (priv->component_id_to_component, compose_id_list_foreach, &list);

    return list;
}

/**
 * e_component_registry_get_component_by_id:
 * @component_registry: 
 * @id: The component's OAF ID
 * 
 * Get the registered component client for the specified ID.  If that component
 * is not registered, return NULL.
 * 
 * Return value: A pointer to the ShellComponentClient for that component.
 **/
EvolutionShellComponentClient *
e_component_registry_get_component_by_id  (EComponentRegistry *component_registry,
                       const char *id)
{
    EComponentRegistryPrivate *priv;
    const Component *component;

    g_return_val_if_fail (component_registry != NULL, NULL);
    g_return_val_if_fail (E_IS_COMPONENT_REGISTRY (component_registry), NULL);
    g_return_val_if_fail (id != NULL, NULL);

    priv = component_registry->priv;

    component = g_hash_table_lookup (priv->component_id_to_component, id);
    if (component == NULL)
        return NULL;

    return component->client;
}


EvolutionShellComponentClient *
e_component_registry_restart_component  (EComponentRegistry *component_registry,
                     const char *id)
{
    EComponentRegistryPrivate *priv;
    Component *component;
    CORBA_Environment ev;
    CORBA_Object corba_objref;

    g_return_val_if_fail (component_registry != NULL, NULL);
    g_return_val_if_fail (E_IS_COMPONENT_REGISTRY (component_registry), NULL);
    g_return_val_if_fail (id != NULL, NULL);

    priv = component_registry->priv;

    component = g_hash_table_lookup (priv->component_id_to_component, id);
    if (component == NULL)
        return NULL;

    CORBA_exception_init (&ev);

    g_hash_table_remove (priv->component_id_to_component, id);

    corba_objref = CORBA_Object_duplicate (bonobo_object_corba_objref (BONOBO_OBJECT (component->client)), &ev);

    component_free (component);

    wait_for_corba_object_to_die (corba_objref, id);

    CORBA_exception_free (&ev);

#if 1
    if (! register_component (component_registry, id, TRUE))
        return NULL;

    return e_component_registry_get_component_by_id (component_registry, id);
#else
    client = evolution_shell_component_client_new (id);
    if (client == NULL)
        return NULL;

    component = component_new (id, client);
    g_hash_table_insert (priv->component_id_to_component, component->id, component);
    bonobo_object_unref (BONOBO_OBJECT (client));
#endif

    return component->client;
}


E_MAKE_TYPE (e_component_registry, "EComponentRegistry", EComponentRegistry,
         class_init, init, PARENT_TYPE)