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/* ATK - Accessibility Toolkit
* Copyright 2001 Sun Microsystems Inc.
*
* This library 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) any later version.
*
* This library 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 this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "atkstreamablecontent.h"
/**
* SECTION:atkstreamablecontent
* @Short_description: The ATK interface which provides access to
* streamable content.
* @Title:AtkStreamableContent
*
* An interface whereby an object allows its backing content to be
* streamed to clients. Typical implementors would be images or
* icons, HTML content, or multimedia display/rendering widgets.
*
* Negotiation of content type is allowed. Clients may examine the
* backing data and transform, convert, or parse the content in order
* to present it in an alternate form to end-users.
*
* The AtkStreamableContent interface is particularly useful for
* saving, printing, or post-processing entire documents, or for
* persisting alternate views of a document. If document content
* itself is being serialized, stored, or converted, then use of the
* AtkStreamableContent interface can help address performance
* issues. Unlike most ATK interfaces, this interface is not strongly
* tied to the current user-agent view of the a particular document,
* but may in some cases give access to the underlying model data.
*/
GType
atk_streamable_content_get_type (void)
{
static GType type = 0;
if (!type) {
GTypeInfo tinfo =
{
sizeof (AtkStreamableContentIface),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
};
type = g_type_register_static (G_TYPE_INTERFACE, "AtkStreamableContent", &tinfo, 0);
}
return type;
}
/**
* atk_streamable_content_get_n_mime_types:
* @streamable: a GObject instance that implements AtkStreamableContentIface
*
* Gets the number of mime types supported by this object.
*
* Returns: a gint which is the number of mime types supported by the object.
**/
gint
atk_streamable_content_get_n_mime_types (AtkStreamableContent *streamable)
{
AtkStreamableContentIface *iface;
g_return_val_if_fail (ATK_IS_STREAMABLE_CONTENT (streamable), 0);
iface = ATK_STREAMABLE_CONTENT_GET_IFACE (streamable);
if (iface->get_n_mime_types)
return (iface->get_n_mime_types) (streamable);
else
return 0;
}
/**
* atk_streamable_content_get_mime_type:
* @streamable: a GObject instance that implements AtkStreamableContent
* @i: a gint representing the position of the mime type starting from 0
*
* Gets the character string of the specified mime type. The first mime
* type is at position 0, the second at position 1, and so on.
*
* Returns: a gchar* representing the specified mime type; the caller
* should not free the character string.
**/
const gchar*
atk_streamable_content_get_mime_type (AtkStreamableContent *streamable,
gint i)
{
AtkStreamableContentIface *iface;
g_return_val_if_fail (i >= 0, NULL);
g_return_val_if_fail (ATK_IS_STREAMABLE_CONTENT (streamable), NULL);
iface = ATK_STREAMABLE_CONTENT_GET_IFACE (streamable);
if (iface->get_mime_type)
return (iface->get_mime_type) (streamable, i);
else
return NULL;
}
/**
* atk_streamable_content_get_stream:
* @streamable: a GObject instance that implements AtkStreamableContentIface
* @mime_type: a gchar* representing the mime type
*
* Gets the content in the specified mime type.
*
* Returns: (transfer full): A #GIOChannel which contains the content in the
* specified mime type.
**/
GIOChannel*
atk_streamable_content_get_stream (AtkStreamableContent *streamable,
const gchar *mime_type)
{
AtkStreamableContentIface *iface;
g_return_val_if_fail (mime_type != NULL, NULL);
g_return_val_if_fail (ATK_IS_STREAMABLE_CONTENT (streamable), NULL);
iface = ATK_STREAMABLE_CONTENT_GET_IFACE (streamable);
if (iface->get_stream)
return (iface->get_stream) (streamable, mime_type);
else
return NULL;
}
/**
* atk_streamable_content_get_uri:
* @streamable: a GObject instance that implements AtkStreamableContentIface
* @mime_type: a gchar* representing the mime type, or NULL to request a URI
* for the default mime type.
*
* Get a string representing a URI in IETF standard format
* (see http://www.ietf.org/rfc/rfc2396.txt) from which the object's content
* may be streamed in the specified mime-type, if one is available.
* If mime_type is NULL, the URI for the default (and possibly only) mime-type is
* returned.
*
* Note that it is possible for get_uri to return NULL but for
* get_stream to work nonetheless, since not all GIOChannels connect to URIs.
*
* Returns: Returns a string representing a URI, or NULL if no corresponding URI
* can be constructed.
*
* Since: 1.12
**/
const gchar*
atk_streamable_content_get_uri (AtkStreamableContent *streamable,
const gchar *mime_type)
{
AtkStreamableContentIface *iface;
g_return_val_if_fail (mime_type != NULL, NULL);
g_return_val_if_fail (ATK_IS_STREAMABLE_CONTENT (streamable), NULL);
iface = ATK_STREAMABLE_CONTENT_GET_IFACE (streamable);
if (iface->get_uri)
return (iface->get_uri) (streamable, mime_type);
else
return NULL;
}
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