Commit c0758723 authored by Carlos Garcia Campos's avatar Carlos Garcia Campos

[metadata] Add EvMetadata to handle gvfs metadata

parent f2952fb9
......@@ -49,6 +49,8 @@ evince_SOURCES= \
$(DBUS_SOURCES) \
ev-message-area.c \
ev-message-area.h \
ev-metadata.c \
ev-metadata.h \
ev-metadata-manager.c \
ev-metadata-manager.h \
ev-navigation-action.c \
......
/* ev-metadata.c
* this file is part of evince, a gnome document viewer
*
* Copyright (C) 2009 Carlos Garcia Campos <carlosgc@gnome.org>
*
* Evince 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.
*
* Evince 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 <gio/gio.h>
#include <string.h>
#include "ev-metadata.h"
struct _EvMetadata {
GObject base;
GFile *file;
GHashTable *items;
};
struct _EvMetadataClass {
GObjectClass base_class;
};
G_DEFINE_TYPE (EvMetadata, ev_metadata, G_TYPE_OBJECT)
#define EV_METADATA_NAMESPACE "metadata::evince"
static void
ev_metadata_finalize (GObject *object)
{
EvMetadata *metadata = EV_METADATA (object);
if (metadata->items) {
g_hash_table_destroy (metadata->items);
metadata->items = NULL;
}
if (metadata->file) {
g_object_unref (metadata->file);
metadata->file = NULL;
}
G_OBJECT_CLASS (ev_metadata_parent_class)->finalize (object);
}
static void
ev_metadata_init (EvMetadata *metadata)
{
metadata->items = g_hash_table_new_full (g_str_hash,
g_str_equal,
g_free,
g_free);
}
static void
ev_metadata_class_init (EvMetadataClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = ev_metadata_finalize;
}
static void
ev_metadata_load (EvMetadata *metadata)
{
GFileInfo *info;
gchar **attrs;
gint i;
GError *error = NULL;
info = g_file_query_info (metadata->file, "metadata::*", 0, NULL, &error);
if (!info) {
g_warning ("%s", error->message);
g_error_free (error);
return;
}
if (!g_file_info_has_namespace (info, "metadata")) {
g_object_unref (info);
return;
}
attrs = g_file_info_list_attributes (info, "metadata");
for (i = 0; attrs[i]; i++) {
GFileAttributeType type;
gpointer value;
const gchar *key;
if (!g_str_has_prefix (attrs[i], EV_METADATA_NAMESPACE))
continue;
if (!g_file_info_get_attribute_data (info, attrs[i],
&type, &value, NULL)) {
continue;
}
key = attrs[i] + strlen (EV_METADATA_NAMESPACE"::");
if (type == G_FILE_ATTRIBUTE_TYPE_STRING) {
g_hash_table_insert (metadata->items,
g_strdup (key),
g_strdup (value));
}
}
g_strfreev (attrs);
g_object_unref (info);
}
EvMetadata *
ev_metadata_new (GFile *file)
{
EvMetadata *metadata;
g_return_val_if_fail (G_IS_FILE (file), NULL);
metadata = EV_METADATA (g_object_new (EV_TYPE_METADATA, NULL));
metadata->file = g_object_ref (file);
ev_metadata_load (metadata);
return metadata;
}
gboolean
ev_metadata_get_string (EvMetadata *metadata,
const gchar *key,
gchar **value)
{
gchar *v;
v = g_hash_table_lookup (metadata->items, key);
if (!v)
return FALSE;
*value = v;
return TRUE;
}
static void
metadata_set_callback (GObject *file,
GAsyncResult *result,
EvMetadata *metadata)
{
GError *error = NULL;
if (!g_file_set_attributes_finish (G_FILE (file), result, NULL, &error)) {
g_warning ("%s", error->message);
g_error_free (error);
}
}
gboolean
ev_metadata_set_string (EvMetadata *metadata,
const gchar *key,
const gchar *value)
{
GFileInfo *info;
gchar *gio_key;
info = g_file_info_new ();
gio_key = g_strconcat (EV_METADATA_NAMESPACE"::", key, NULL);
if (value) {
g_file_info_set_attribute_string (info, gio_key, value);
} else {
g_file_info_set_attribute (info, gio_key,
G_FILE_ATTRIBUTE_TYPE_INVALID,
NULL);
}
g_free (gio_key);
g_hash_table_insert (metadata->items, g_strdup (key), g_strdup (value));
g_file_set_attributes_async (metadata->file,
info,
0,
G_PRIORITY_DEFAULT,
NULL,
(GAsyncReadyCallback)metadata_set_callback,
metadata);
g_object_unref (info);
return TRUE;
}
gboolean
ev_metadata_get_int (EvMetadata *metadata,
const gchar *key,
gint *value)
{
gchar *string_value;
gchar *endptr;
gint int_value;
if (!ev_metadata_get_string (metadata, key, &string_value))
return FALSE;
int_value = g_ascii_strtoull (string_value, &endptr, 0);
if (int_value == 0 && string_value == endptr)
return FALSE;
*value = int_value;
return TRUE;
}
gboolean
ev_metadata_set_int (EvMetadata *metadata,
const gchar *key,
gint value)
{
gchar string_value[32];
g_snprintf (string_value, sizeof (string_value), "%d", value);
return ev_metadata_set_string (metadata, key, string_value);
}
gboolean
ev_metadata_get_double (EvMetadata *metadata,
const gchar *key,
gdouble *value)
{
gchar *string_value;
gchar *endptr;
gdouble double_value;
if (!ev_metadata_get_string (metadata, key, &string_value))
return FALSE;
double_value = g_ascii_strtod (string_value, &endptr);
if (double_value == 0. && string_value == endptr)
return FALSE;
*value = double_value;
return TRUE;
}
gboolean
ev_metadata_set_double (EvMetadata *metadata,
const gchar *key,
gdouble value)
{
gchar string_value[G_ASCII_DTOSTR_BUF_SIZE];
g_ascii_dtostr (string_value, G_ASCII_DTOSTR_BUF_SIZE, value);
return ev_metadata_set_string (metadata, key, string_value);
}
gboolean
ev_metadata_get_boolean (EvMetadata *metadata,
const gchar *key,
gboolean *value)
{
gint int_value;
if (!ev_metadata_get_int (metadata, key, &int_value))
return FALSE;
*value = int_value;
return TRUE;
}
gboolean
ev_metadata_set_boolean (EvMetadata *metadata,
const gchar *key,
gboolean value)
{
return ev_metadata_set_string (metadata, key, value ? "1" : "0");
}
gboolean
ev_is_metadata_supported_for_file (GFile *file)
{
GFileAttributeInfoList *namespaces;
gint i;
gboolean retval = FALSE;
namespaces = g_file_query_writable_namespaces (file, NULL, NULL);
if (!namespaces)
return retval;
for (i = 0; i < namespaces->n_infos; i++) {
if (strcmp (namespaces->infos[i].name, "metadata") == 0) {
retval = TRUE;
break;
}
}
g_file_attribute_info_list_unref (namespaces);
return retval;
}
/* ev-metadata.h
* this file is part of evince, a gnome document viewer
*
* Copyright (C) 2009 Carlos Garcia Campos <carlosgc@gnome.org>
*
* Evince 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.
*
* Evince 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.
*/
#ifndef EV_METADATA_H
#define EV_METADATA_H
#include <glib-object.h>
G_BEGIN_DECLS
#define EV_TYPE_METADATA (ev_metadata_get_type())
#define EV_METADATA(object) (G_TYPE_CHECK_INSTANCE_CAST((object), EV_TYPE_METADATA, EvMetadata))
#define EV_METADATA_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass), EV_TYPE_METADATA, EvMetadataClass))
#define EV_IS_METADATA(object) (G_TYPE_CHECK_INSTANCE_TYPE((object), EV_TYPE_METADATA))
typedef struct _EvMetadata EvMetadata;
typedef struct _EvMetadataClass EvMetadataClass;
GType ev_metadata_get_type (void) G_GNUC_CONST;
EvMetadata *ev_metadata_new (GFile *file);
gboolean ev_metadata_get_string (EvMetadata *metadata,
const gchar *key,
gchar **value);
gboolean ev_metadata_set_string (EvMetadata *metadata,
const gchar *key,
const gchar *value);
gboolean ev_metadata_get_int (EvMetadata *metadata,
const gchar *key,
gint *value);
gboolean ev_metadata_set_int (EvMetadata *metadata,
const gchar *key,
gint value);
gboolean ev_metadata_get_double (EvMetadata *metadata,
const gchar *key,
gdouble *value);
gboolean ev_metadata_set_double (EvMetadata *metadata,
const gchar *key,
gdouble value);
gboolean ev_metadata_get_boolean (EvMetadata *metadata,
const gchar *key,
gboolean *value);
gboolean ev_metadata_set_boolean (EvMetadata *metadata,
const gchar *key,
gboolean value);
gboolean ev_is_metadata_supported_for_file (GFile *file);
G_END_DECLS
#endif /* EV_METADATA_H */
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