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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* evolution-storage.c
 *
 * Copyright (C) 2000  Helix Code, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 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 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 <bonobo.h>

#include "Evolution.h"

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

#include "e-util/e-corba-utils.h"

#include "e-folder-tree.h"

#include "evolution-storage.h"


#define PARENT_TYPE BONOBO_OBJECT_TYPE
static BonoboObjectClass *parent_class = NULL;

struct _EvolutionStoragePrivate {
    /* Name of the storage.  */
    char *name;

    /* URI for the toplevel node of the storage.  */
    char *toplevel_node_uri;

    /* Type for the toplevel node of the storage.  */
    char *toplevel_node_type;

    /* The set of folders we have in this storage.  */
    EFolderTree *folder_tree;

    /* Mappings from URIs to folder tree paths.  */
    GHashTable *uri_to_path;

    /* The listener registered on this storage.  */
    GList *corba_storage_listeners;
};


/* Utility functions.  */

static void
list_through_listener_foreach (EFolderTree *tree,
                   const char *path,
                   void *data,
                   void *closure)
{
    const GNOME_Evolution_Folder *corba_folder;
    GNOME_Evolution_StorageListener corba_listener;
    CORBA_Environment ev;

    corba_folder = (GNOME_Evolution_Folder *) data;
    corba_listener = (GNOME_Evolution_StorageListener) closure;

    /* The root folder has no data.  */
    if (corba_folder == NULL)
        return;
    
    CORBA_exception_init (&ev);
    GNOME_Evolution_StorageListener_notifyFolderCreated (corba_listener, path, corba_folder, &ev);
    CORBA_exception_free (&ev);
}

static void
list_through_listener (EvolutionStorage *storage,
               GNOME_Evolution_StorageListener listener,
               CORBA_Environment *ev)
{
    EvolutionStoragePrivate *priv;

    priv = storage->priv;

    e_folder_tree_foreach (priv->folder_tree,
                   list_through_listener_foreach,
                   listener);
}

static GList *
find_listener_in_list (const GNOME_Evolution_StorageListener listener,
               GList *list)
{
    CORBA_Environment ev;
    GList *p;

    CORBA_exception_init (&ev);

    for (p = list; p != NULL; p = p->next) {
        GNOME_Evolution_StorageListener listener_item;

        listener_item = (GNOME_Evolution_StorageListener) p->data;

        if (CORBA_Object_is_equivalent (listener_item, listener, &ev) && ev._major == CORBA_NO_EXCEPTION)
            return p;
    }

    CORBA_exception_free (&ev);

    return NULL;
}

static gboolean
add_listener (EvolutionStorage *storage,
          const GNOME_Evolution_StorageListener listener)
{
    EvolutionStoragePrivate *priv;
    GNOME_Evolution_StorageListener listener_copy;
    CORBA_Environment ev;

    priv = storage->priv;

    if (find_listener_in_list (listener, priv->corba_storage_listeners) != NULL)
        return FALSE;

    CORBA_exception_init (&ev);

    listener_copy = CORBA_Object_duplicate (listener, &ev);
    if (ev._major != CORBA_NO_EXCEPTION) {
        /* Panic.  */
        g_warning ("EvolutionStorage -- Cannot duplicate listener.");
        CORBA_exception_free (&ev);

        /* FIXME this will cause the ::add_listener implementation to
                   incorrectly raise `AlreadyListening' */
        return FALSE;
    }

    priv->corba_storage_listeners = g_list_prepend (priv->corba_storage_listeners,
                            listener_copy);

    list_through_listener (storage, listener_copy, &ev);

    CORBA_exception_free (&ev);

    return TRUE;
}

static gboolean
remove_listener (EvolutionStorage *storage,
         const GNOME_Evolution_StorageListener listener)
{
    EvolutionStoragePrivate *priv;
    CORBA_Environment ev;
    GList *p;

    priv = storage->priv;

    p = find_listener_in_list (listener, priv->corba_storage_listeners);
    if (p == NULL)
        return FALSE;

    CORBA_exception_init (&ev);
    CORBA_Object_release ((CORBA_Object) p->data, &ev);
    CORBA_exception_free (&ev);

    priv->corba_storage_listeners = g_list_remove_link (priv->corba_storage_listeners, p);

    return TRUE;
}


/* Functions for the EFolderTree in the storage.  */

static void
folder_destroy_notify (EFolderTree *tree,
               const char *path,
               void *data,
               void *closure)
{
    GNOME_Evolution_Folder *corba_folder;

    corba_folder = (GNOME_Evolution_Folder *) data;
    CORBA_free (data);
}


/* CORBA interface implementation.  */

static POA_GNOME_Evolution_Storage__vepv Storage_vepv;

static POA_GNOME_Evolution_Storage *
create_servant (void)
{
    POA_GNOME_Evolution_Storage *servant;
    CORBA_Environment ev;

    servant = (POA_GNOME_Evolution_Storage *) g_new0 (BonoboObjectServant, 1);
    servant->vepv = &Storage_vepv;

    CORBA_exception_init (&ev);

    POA_GNOME_Evolution_Storage__init ((PortableServer_Servant) servant, &ev);
    if (ev._major != CORBA_NO_EXCEPTION) {
        g_free (servant);
        CORBA_exception_free (&ev);
        return NULL;
    }

    CORBA_exception_free (&ev);

    return servant;
}

static CORBA_char *
impl_Storage__get_name (PortableServer_Servant servant,
            CORBA_Environment *ev)
{
    BonoboObject *bonobo_object;
    EvolutionStorage *storage;
    EvolutionStoragePrivate *priv;

    bonobo_object = bonobo_object_from_servant (servant);
    storage = EVOLUTION_STORAGE (bonobo_object);
    priv = storage->priv;

    return CORBA_string_dup (priv->name);
}

static void
impl_Storage_add_listener (PortableServer_Servant servant,
               const GNOME_Evolution_StorageListener listener,
               CORBA_Environment *ev)
{
    BonoboObject *bonobo_object;
    EvolutionStorage *storage;

    bonobo_object = bonobo_object_from_servant (servant);
    storage = EVOLUTION_STORAGE (bonobo_object);

    if (! add_listener (storage, listener))
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION, ex_GNOME_Evolution_Storage_AlreadyListening, NULL);
}

static void
impl_Storage_remove_listener (PortableServer_Servant servant,
                  const GNOME_Evolution_StorageListener listener,
                  CORBA_Environment *ev)
{
    BonoboObject *bonobo_object;
    EvolutionStorage *storage;

    bonobo_object = bonobo_object_from_servant (servant);
    storage = EVOLUTION_STORAGE (bonobo_object);

    if (! remove_listener (storage, listener))
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION, ex_GNOME_Evolution_Storage_NotFound, NULL);
}


/* GtkObject methods.  */

static void
free_mapping (gpointer key, gpointer value, gpointer user_data)
{
    g_free (key);
    g_free (value);
}

static void
destroy (GtkObject *object)
{
    EvolutionStorage *storage;
    EvolutionStoragePrivate *priv;
    CORBA_Environment ev;
    GList *p;

    storage = EVOLUTION_STORAGE (object);
    priv = storage->priv;

    g_free (priv->name);
    g_free (priv->toplevel_node_uri);
    g_free (priv->toplevel_node_type);
    if (priv->folder_tree != NULL)
        e_folder_tree_destroy (priv->folder_tree);
    if (priv->uri_to_path != NULL) {
        g_hash_table_foreach (priv->uri_to_path, free_mapping, NULL);
        g_hash_table_destroy (priv->uri_to_path);
    }

    CORBA_exception_init (&ev);

    for (p = priv->corba_storage_listeners; p != NULL; p = p->next) {
        GNOME_Evolution_StorageListener listener;

        listener = p->data;

        GNOME_Evolution_StorageListener_notifyDestroyed (listener, &ev);

        /* (This is not a Bonobo object, so no unref.)  */
        CORBA_Object_release (listener, &ev);
    }

    g_list_free (priv->corba_storage_listeners);

    CORBA_exception_free (&ev);

    g_free (priv);

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


static void
corba_class_init (void)
{
    POA_GNOME_Evolution_Storage__vepv *vepv;

    PortableServer_ServantBase__epv *base_epv;

    base_epv = g_new0 (PortableServer_ServantBase__epv, 1);
    base_epv->_private    = NULL;
    base_epv->finalize    = NULL;
    base_epv->default_POA = NULL;

    vepv = &Storage_vepv;
    vepv->_base_epv = base_epv;
    vepv->Bonobo_Unknown_epv = bonobo_object_get_epv ();
    vepv->GNOME_Evolution_Storage_epv = evolution_storage_get_epv ();
}

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

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

    parent_class = gtk_type_class (bonobo_object_get_type ());

    corba_class_init ();
}

static void
init (EvolutionStorage *storage)
{
    EvolutionStoragePrivate *priv;

    priv = g_new (EvolutionStoragePrivate, 1);
    priv->name                    = NULL;
    priv->toplevel_node_uri       = NULL;
    priv->toplevel_node_type      = NULL;
    priv->folder_tree             = e_folder_tree_new (folder_destroy_notify, storage);
    priv->uri_to_path                = g_hash_table_new (g_str_hash, g_str_equal);
    priv->corba_storage_listeners = NULL;

    storage->priv = priv;
}


POA_GNOME_Evolution_Storage__epv *
evolution_storage_get_epv (void)
{
    POA_GNOME_Evolution_Storage__epv *epv;

    epv = g_new0 (POA_GNOME_Evolution_Storage__epv, 1);
    epv->_get_name      = impl_Storage__get_name;
    epv->addListener    = impl_Storage_add_listener;
    epv->removeListener = impl_Storage_remove_listener;

    return epv;
}

void
evolution_storage_construct (EvolutionStorage *storage,
                 GNOME_Evolution_Storage corba_object,
                 const char *name,
                 const char *toplevel_node_uri,
                 const char *toplevel_node_type)
{
    EvolutionStoragePrivate *priv;
    CORBA_Environment ev;

    g_return_if_fail (storage != NULL);
    g_return_if_fail (EVOLUTION_IS_STORAGE (storage));
    g_return_if_fail (corba_object != CORBA_OBJECT_NIL);
    g_return_if_fail (name != NULL);
    g_return_if_fail (name[0] != '\0');

    CORBA_exception_init (&ev);

    bonobo_object_construct (BONOBO_OBJECT (storage), corba_object);

    priv = storage->priv;
    priv->name               = g_strdup (name);
    priv->toplevel_node_uri  = g_strdup (toplevel_node_uri);
    priv->toplevel_node_type = g_strdup (toplevel_node_type);

    CORBA_exception_free (&ev);
}

EvolutionStorage *
evolution_storage_new (const char *name,
               const char *toplevel_node_uri,
               const char *toplevel_node_type)
{
    EvolutionStorage *new;
    POA_GNOME_Evolution_Storage *servant;
    GNOME_Evolution_Storage corba_object;

    g_return_val_if_fail (name != NULL, NULL);
    g_return_val_if_fail (name[0] != '\0', NULL);

    servant = create_servant ();
    if (servant == NULL)
        return NULL;

    new = gtk_type_new (evolution_storage_get_type ());

    corba_object = bonobo_object_activate_servant (BONOBO_OBJECT (new), servant);
    evolution_storage_construct (new, corba_object, name, toplevel_node_uri, toplevel_node_type);

    return new;
}

EvolutionStorageResult
evolution_storage_register (EvolutionStorage *evolution_storage,
                GNOME_Evolution_StorageRegistry corba_storage_registry)
{
    EvolutionStorageResult result;
    GNOME_Evolution_StorageListener corba_storage_listener;
    GNOME_Evolution_Storage corba_storage;
    EvolutionStoragePrivate *priv;
    CORBA_Environment ev;

    g_return_val_if_fail (evolution_storage != NULL,
                  EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (EVOLUTION_IS_STORAGE (evolution_storage),
                  EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (corba_storage_registry != CORBA_OBJECT_NIL,
                  EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);

    priv = evolution_storage->priv;

    if (priv->corba_storage_listeners != NULL)
        return EVOLUTION_STORAGE_ERROR_ALREADYREGISTERED;

    CORBA_exception_init (&ev);

    corba_storage = bonobo_object_corba_objref (BONOBO_OBJECT (evolution_storage));
    corba_storage_listener = GNOME_Evolution_StorageRegistry_addStorage (corba_storage_registry,
                                         corba_storage,
                                         priv->name,
                                         e_safe_corba_string (priv->toplevel_node_uri),
                                         e_safe_corba_string (priv->toplevel_node_type),
                                         &ev);

    if (ev._major == CORBA_NO_EXCEPTION) {
        add_listener (evolution_storage, corba_storage_listener);
        result = EVOLUTION_STORAGE_OK;
    } else {
        if (ev._major != CORBA_USER_EXCEPTION)
            result = EVOLUTION_STORAGE_ERROR_CORBA;
        else if (strcmp (CORBA_exception_id (&ev), ex_GNOME_Evolution_StorageRegistry_Exists) == 0)
            result = EVOLUTION_STORAGE_ERROR_EXISTS;
        else
            result = EVOLUTION_STORAGE_ERROR_GENERIC;
    }

    CORBA_exception_free (&ev);

    return result;
}

EvolutionStorageResult
evolution_storage_register_on_shell (EvolutionStorage *evolution_storage,
                     GNOME_Evolution_Shell corba_shell)
{
    GNOME_Evolution_StorageRegistry corba_storage_registry;
    EvolutionStorageResult result;
    CORBA_Environment ev;

    g_return_val_if_fail (evolution_storage != NULL,
                  EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (EVOLUTION_IS_STORAGE (evolution_storage),
                  EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (corba_shell != CORBA_OBJECT_NIL,
                  EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);

    CORBA_exception_init (&ev);

    corba_storage_registry = Bonobo_Unknown_queryInterface (corba_shell,
                                 "IDL:GNOME/Evolution/StorageRegistry:1.0",
                                 &ev);
    if (corba_storage_registry == CORBA_OBJECT_NIL || ev._major != CORBA_NO_EXCEPTION) {
        CORBA_exception_free (&ev);
        return EVOLUTION_STORAGE_ERROR_NOREGISTRY;
    }

    result = evolution_storage_register (evolution_storage, corba_storage_registry);

    Bonobo_Unknown_unref (corba_storage_registry, &ev);
    CORBA_Object_release (corba_storage_registry, &ev);

    CORBA_exception_free (&ev);

    return result;
}

EvolutionStorageResult
evolution_storage_new_folder (EvolutionStorage *evolution_storage,
                  const char *path,
                  const char *display_name,
                  const char *type,
                  const char *physical_uri,
                  const char *description,
                  gboolean highlighted)
{
    EvolutionStorageResult   result;
    EvolutionStoragePrivate *priv;
    GNOME_Evolution_Folder  *corba_folder;
    CORBA_Environment ev;
    GList *p;

    g_return_val_if_fail (evolution_storage != NULL,
                  EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (EVOLUTION_IS_STORAGE (evolution_storage),
                  EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (path != NULL, EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (g_path_is_absolute (path), EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (type != NULL, EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (physical_uri != NULL, EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);

    if (description == NULL)
        description = "";

    priv = evolution_storage->priv;

    CORBA_exception_init (&ev);

    corba_folder = GNOME_Evolution_Folder__alloc ();
    corba_folder->display_name = CORBA_string_dup (display_name);
    corba_folder->description  = CORBA_string_dup (description);
    corba_folder->type         = CORBA_string_dup (type);
    corba_folder->physical_uri = CORBA_string_dup (physical_uri);
    corba_folder->highlighted  = highlighted;

    if (! e_folder_tree_add (priv->folder_tree, path, corba_folder)) {
        CORBA_free (corba_folder);
        return EVOLUTION_STORAGE_ERROR_EXISTS;
    }
    g_hash_table_insert (priv->uri_to_path, g_strdup (physical_uri), g_strdup (path));

    result = EVOLUTION_STORAGE_OK;

    for (p = priv->corba_storage_listeners; p != NULL; p = p->next) {
        GNOME_Evolution_StorageListener listener;

        listener = p->data;
        GNOME_Evolution_StorageListener_notifyFolderCreated (listener, path, corba_folder, &ev);

        if (ev._major == CORBA_NO_EXCEPTION)
            continue;

        if (ev._major != CORBA_USER_EXCEPTION)
            result = EVOLUTION_STORAGE_ERROR_CORBA;
        else if (strcmp (CORBA_exception_id (&ev), ex_GNOME_Evolution_StorageListener_Exists) == 0)
            result = EVOLUTION_STORAGE_ERROR_EXISTS;
        else
            result = EVOLUTION_STORAGE_ERROR_GENERIC;

        break;
    }

    CORBA_exception_free (&ev);

    return result;
}

EvolutionStorageResult
evolution_storage_update_folder (EvolutionStorage *evolution_storage,
                 const char *path, const char *display_name,
                 gboolean highlighted)
{
    EvolutionStorageResult result;
    EvolutionStoragePrivate *priv;
    CORBA_Environment ev;
    GList *p;
    GNOME_Evolution_Folder *corba_folder;

    g_return_val_if_fail (evolution_storage != NULL,
                  EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (EVOLUTION_IS_STORAGE (evolution_storage),
                  EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (path != NULL, EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (g_path_is_absolute (path), EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);

    priv = evolution_storage->priv;

    if (priv->corba_storage_listeners == NULL)
        return EVOLUTION_STORAGE_ERROR_NOTREGISTERED;

    CORBA_exception_init (&ev);

    result = EVOLUTION_STORAGE_OK;

    for (p = priv->corba_storage_listeners; p != NULL; p = p->next) {
        GNOME_Evolution_StorageListener listener;

        listener = p->data;
        GNOME_Evolution_StorageListener_notifyFolderUpdated (listener, path, display_name, highlighted, &ev);

        if (ev._major != CORBA_NO_EXCEPTION)
            continue;

        if (ev._major != CORBA_USER_EXCEPTION)
            result = EVOLUTION_STORAGE_ERROR_CORBA;
        else if (strcmp (CORBA_exception_id (&ev), ex_GNOME_Evolution_StorageListener_NotFound) == 0)
            result = EVOLUTION_STORAGE_ERROR_NOTFOUND;
        else
            result = EVOLUTION_STORAGE_ERROR_GENERIC;

        break;
    }

    CORBA_exception_free (&ev);

    if (result == EVOLUTION_STORAGE_OK) {
        corba_folder = e_folder_tree_get_folder (priv->folder_tree, path);
        if (corba_folder != NULL) {
            CORBA_free (corba_folder->display_name);
            corba_folder->display_name = CORBA_string_dup (display_name);
            corba_folder->highlighted = highlighted;
        } else
            result = EVOLUTION_STORAGE_ERROR_NOTFOUND;
    }

    return result;
}

EvolutionStorageResult
evolution_storage_update_folder_by_uri (EvolutionStorage *evolution_storage,
                    const char *physical_uri,
                    const char *display_name,
                    gboolean highlighted)
{
    EvolutionStoragePrivate *priv;
    char *path;

    g_return_val_if_fail (evolution_storage != NULL,
                  EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (EVOLUTION_IS_STORAGE (evolution_storage),
                  EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (physical_uri != NULL, EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);

    priv = evolution_storage->priv;

    path = g_hash_table_lookup (priv->uri_to_path, physical_uri);
    return evolution_storage_update_folder (evolution_storage, path, display_name, highlighted);
}

EvolutionStorageResult
evolution_storage_removed_folder (EvolutionStorage *evolution_storage,
                  const char *path)
{
    EvolutionStorageResult result;
    EvolutionStoragePrivate *priv;
    CORBA_Environment ev;
    GNOME_Evolution_Folder *corba_folder;
    gpointer key, value;
    GList *p;

    g_return_val_if_fail (evolution_storage != NULL,
                  EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (EVOLUTION_IS_STORAGE (evolution_storage),
                  EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (path != NULL, EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);
    g_return_val_if_fail (g_path_is_absolute (path), EVOLUTION_STORAGE_ERROR_INVALIDPARAMETER);

    priv = evolution_storage->priv;

    if (priv->corba_storage_listeners == NULL)
        return EVOLUTION_STORAGE_ERROR_NOTREGISTERED;

    corba_folder = e_folder_tree_get_folder (priv->folder_tree, path);
    if (corba_folder == NULL)
        return EVOLUTION_STORAGE_ERROR_NOTFOUND;
    if (g_hash_table_lookup_extended (priv->uri_to_path, corba_folder->physical_uri, &key, &value)) {
        g_hash_table_remove (priv->uri_to_path, key);
        g_free (key);
        g_free (value);
    }
    e_folder_tree_remove (priv->folder_tree, path);

    CORBA_exception_init (&ev);

    result = EVOLUTION_STORAGE_OK;

    for (p = priv->corba_storage_listeners; p != NULL; p = p->next) {
        GNOME_Evolution_StorageListener listener;

        listener = p->data;
        GNOME_Evolution_StorageListener_notifyFolderRemoved (listener, path, &ev);

        if (ev._major != CORBA_NO_EXCEPTION)
            continue;

        if (ev._major != CORBA_USER_EXCEPTION)
            result = EVOLUTION_STORAGE_ERROR_CORBA;
        else if (strcmp (CORBA_exception_id (&ev), ex_GNOME_Evolution_StorageListener_NotFound) == 0)
            result = EVOLUTION_STORAGE_ERROR_NOTFOUND;
        else
            result = EVOLUTION_STORAGE_ERROR_GENERIC;

        break;
    }

    CORBA_exception_free (&ev);

    return result;
}


E_MAKE_TYPE (evolution_storage, "EvolutionStorage", EvolutionStorage, class_init, init, PARENT_TYPE)