path: root/camel/camel-store.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camel-store.c : Abstract class for an email store */

/* 
 *
 * Authors:
 *  Bertrand Guiheneuf <bertrand@helixcode.com>
 *  Dan Winship <danw@helixcode.com>
 *
 * Copyright 1999, 2000 Helix Code, Inc. (http://www.helixcode.com)
 *
 * 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
 */
#include <config.h>
#include "camel-store.h"
#include "camel-folder.h"
#include "camel-exception.h"

static CamelServiceClass *parent_class = NULL;

/* Returns the class for a CamelStore */
#define CS_CLASS(so) CAMEL_STORE_CLASS (GTK_OBJECT(so)->klass)

static CamelFolder *get_folder (CamelStore *store, const char *folder_name,
                gboolean create, CamelException *ex);
static void delete_folder (CamelStore *store, const char *folder_name,
               CamelException *ex);

static char *get_folder_name (CamelStore *store, const char *folder_name,
                  CamelException *ex);
static char *get_root_folder_name (CamelStore *store, CamelException *ex);
static char *get_default_folder_name (CamelStore *store, CamelException *ex);

static CamelFolder *lookup_folder (CamelStore *store, const char *folder_name);
static void cache_folder (CamelStore *store, const char *folder_name,
              CamelFolder *folder);
static void uncache_folder (CamelStore *store, CamelFolder *folder);

static void finalize (GtkObject *object);

static void
camel_store_class_init (CamelStoreClass *camel_store_class)
{
    GtkObjectClass *gtk_object_class =
        GTK_OBJECT_CLASS (camel_store_class);

    parent_class = gtk_type_class (camel_service_get_type ());

    /* virtual method definition */
    camel_store_class->get_folder = get_folder;
    camel_store_class->delete_folder = delete_folder;
    camel_store_class->get_folder_name = get_folder_name;
    camel_store_class->get_root_folder_name = get_root_folder_name;
    camel_store_class->get_default_folder_name = get_default_folder_name;
    camel_store_class->lookup_folder = lookup_folder;
    camel_store_class->cache_folder = cache_folder;
    camel_store_class->uncache_folder = uncache_folder;

    /* virtual method override */
    gtk_object_class->finalize = finalize;
}

static void
camel_store_init (void *o, void *k)
{
    CamelStore *store = o;

    store->folders = g_hash_table_new (g_str_hash, g_str_equal);
}

GtkType
camel_store_get_type (void)
{
    static GtkType camel_store_type = 0;

    if (!camel_store_type) {
        GtkTypeInfo camel_store_info =
        {
            "CamelStore",
            sizeof (CamelStore),
            sizeof (CamelStoreClass),
            (GtkClassInitFunc) camel_store_class_init,
            (GtkObjectInitFunc) camel_store_init,
                /* reserved_1 */ NULL,
                /* reserved_2 */ NULL,
            (GtkClassInitFunc) NULL,
        };

        camel_store_type = gtk_type_unique (CAMEL_SERVICE_TYPE, &camel_store_info);
    }

    return camel_store_type;
}


static void
finalize (GtkObject *object)
{
    CamelStore *store = CAMEL_STORE (object);

    if (store->folders) {
        if (g_hash_table_size (store->folders) != 0) {
            g_warning ("Folder cache for store %p contains "
                   "%d folders at destruction.", store,
                   g_hash_table_size (store->folders));
        }
        g_hash_table_destroy (store->folders);
    }
}


static CamelFolder *
get_folder (CamelStore *store, const char *folder_name,
        gboolean create, CamelException *ex)
{
    g_warning ("CamelStore::get_folder not implemented for `%s'",
           gtk_type_name (GTK_OBJECT_TYPE (store)));
    return NULL;
}

static void
delete_folder (CamelStore *store, const char *folder_name, CamelException *ex)
{
    g_warning ("CamelStore::delete_folder not implemented for `%s'",
           gtk_type_name (GTK_OBJECT_TYPE (store)));
}


/* CamelStore::get_folder_name should:
 * a) make sure that the provided name is valid
 * b) return it in canonical form, in allocated memory.
 *
 * This is used to make sure that duplicate names for the same folder
 * don't result in duplicate cache entries.
 */
static char *
get_folder_name (CamelStore *store, const char *folder_name,
         CamelException *ex)
{
    g_warning ("CamelStore::get_folder_name not implemented for `%s'",
           gtk_type_name (GTK_OBJECT_TYPE (store)));
    return NULL;
}

static char *
get_root_folder_name (CamelStore *store, CamelException *ex)
{
    return g_strdup ("/");
}

static char *
get_default_folder_name (CamelStore *store, CamelException *ex)
{
    return CS_CLASS (store)->get_root_folder_name (store, ex);
}

static CamelFolder *
lookup_folder (CamelStore *store, const char *folder_name)
{
    if (store->folders) {
        CamelFolder *folder = g_hash_table_lookup (store->folders, folder_name);
        if (folder)
            gtk_object_ref(GTK_OBJECT(folder));
        return folder;
    }
    return NULL;
}

static void
cache_folder (CamelStore *store, const char *folder_name, CamelFolder *folder)
{
    if (!store->folders)
        return;

    if (g_hash_table_lookup (store->folders, folder_name)) {
        g_warning ("Caching folder %s that already exists.",
               folder_name);
    }
    g_hash_table_insert (store->folders, g_strdup (folder_name), folder);
    gtk_signal_connect_object (GTK_OBJECT (folder), "destroy",
                   GTK_SIGNAL_FUNC (CS_CLASS (store)->uncache_folder),
                   GTK_OBJECT (store));
}

static gboolean
folder_matches (gpointer key, gpointer value, gpointer user_data)
{
    if (value == user_data) {
        g_free (key);
        return TRUE;
    } else
        return FALSE;
}

static void
uncache_folder (CamelStore *store, CamelFolder *folder)
{
    g_hash_table_foreach_remove (store->folders, folder_matches, folder);
}


static CamelFolder *
get_folder_internal (CamelStore *store, const char *folder_name,
             gboolean create, CamelException *ex)
{
    CamelFolder *folder = NULL;

    /* Try cache first. */
    folder = CS_CLASS (store)->lookup_folder (store, folder_name);

    if (!folder) {
        folder = CS_CLASS (store)->get_folder (store, folder_name,
                               create, ex);
        if (!folder)
            return NULL;

        CS_CLASS (store)->cache_folder (store, folder_name, folder);
    }

    return folder;
}



/** 
 * camel_store_get_folder: Return the folder corresponding to a path.
 * @store: a CamelStore
 * @folder_name: name of the folder to get
 * @create: whether or not to create the folder if it doesn't already exist
 * @ex: a CamelException
 * 
 * Returns the folder corresponding to the path @folder_name. If the
 * path begins with the separator character, it is relative to the
 * root folder. Otherwise, it is relative to the default folder. If
 * @create is %TRUE and the named folder does not already exist, it will
 * be created.
 *
 * Return value: the folder
 **/
CamelFolder *
camel_store_get_folder (CamelStore *store, const char *folder_name,
            gboolean create, CamelException *ex)
{
    char *name;
    CamelFolder *folder = NULL;

    name = CS_CLASS (store)->get_folder_name (store, folder_name, ex);
    if (name) {
        folder = get_folder_internal (store, name, create, ex);
        g_free (name);
    }
    return folder;
}


/** 
 * camel_store_delete_folder: Delete the folder corresponding to a path.
 * @store: a CamelStore
 * @folder_name: name of the folder to delete
 * @ex: a CamelException
 * 
 * Deletes the named folder. The folder must be empty.
 **/
void
camel_store_delete_folder (CamelStore *store, const char *folder_name,
               CamelException *ex)
{
    char *name;

    name = CS_CLASS (store)->get_folder_name (store, folder_name, ex);
    if (name) {
        CS_CLASS (store)->delete_folder (store, name, ex);
        g_free (name);
    }
}


/**
 * camel_store_get_root_folder: return the top-level folder
 * 
 * Returns the folder which is at the top of the folder hierarchy.
 * This folder may or may not be the same as the default folder.
 * 
 * Return value: the top-level folder.
 **/
CamelFolder *
camel_store_get_root_folder (CamelStore *store, CamelException *ex)
{
    char *name;
    CamelFolder *folder = NULL;

    name = CS_CLASS (store)->get_root_folder_name (store, ex);
    if (name) {
        folder = get_folder_internal (store, name, TRUE, ex);
        g_free (name);
    }
    return folder;
}

/** 
 * camel_store_get_default_folder: return the store default folder
 *
 * The default folder is the folder which is presented to the user in
 * the default configuration. This defaults to the root folder if
 * the store doesn't override it.
 *
 * Return value: the default folder.
 **/
CamelFolder *
camel_store_get_default_folder (CamelStore *store, CamelException *ex)
{
    char *name;
    CamelFolder *folder = NULL;

    name = CS_CLASS (store)->get_default_folder_name (store, ex);
    if (name) {
        folder = get_folder_internal (store, name, TRUE, ex);
        g_free (name);
    }
    return folder;
}