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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Extension Points</title>
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<tr><td colspan="5" class="shortcuts"><nobr><a href="#gio-Extension-Points.synopsis" class="shortcut">Top</a>
|
<a href="#gio-Extension-Points.description" class="shortcut">Description</a></nobr></td></tr>
</table>
<div class="refentry" lang="en">
<a name="gio-Extension-Points"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gio-Extension-Points.top_of_page"></a>Extension Points</span></h2>
<p>Extension Points — Extension Points</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gio-Extension-Points.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gio.h>
<a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension">GIOExtension</a>;
<a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint">GIOExtensionPoint</a>;
const char* <a class="link" href="gio-Extension-Points.html#g-io-extension-get-name" title="g_io_extension_get_name ()">g_io_extension_get_name</a> (<a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension">GIOExtension</a> *extension);
<a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"
>gint</a> <a class="link" href="gio-Extension-Points.html#g-io-extension-get-priority" title="g_io_extension_get_priority ()">g_io_extension_get_priority</a> (<a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension">GIOExtension</a> *extension);
<a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"
>GType</a> <a class="link" href="gio-Extension-Points.html#g-io-extension-get-type" title="g_io_extension_get_type ()">g_io_extension_get_type</a> (<a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension">GIOExtension</a> *extension);
<a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension">GIOExtension</a>* <a class="link" href="gio-Extension-Points.html#g-io-extension-point-get-extension-by-name" title="g_io_extension_point_get_extension_by_name ()">g_io_extension_point_get_extension_by_name</a>
(<a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint">GIOExtensionPoint</a> *extension_point,
const char *name);
<a
href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"
>GList</a>* <a class="link" href="gio-Extension-Points.html#g-io-extension-point-get-extensions" title="g_io_extension_point_get_extensions ()">g_io_extension_point_get_extensions</a> (<a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint">GIOExtensionPoint</a> *extension_point);
<a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"
>GType</a> <a class="link" href="gio-Extension-Points.html#g-io-extension-point-get-required-type" title="g_io_extension_point_get_required_type ()">g_io_extension_point_get_required_type</a>
(<a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint">GIOExtensionPoint</a> *extension_point);
<a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension">GIOExtension</a>* <a class="link" href="gio-Extension-Points.html#g-io-extension-point-implement" title="g_io_extension_point_implement ()">g_io_extension_point_implement</a> (const char *extension_point_name,
<a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"
>GType</a> type,
const char *extension_name,
<a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"
>gint</a> priority);
<a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint">GIOExtensionPoint</a>* <a class="link" href="gio-Extension-Points.html#g-io-extension-point-lookup" title="g_io_extension_point_lookup ()">g_io_extension_point_lookup</a> (const char *name);
<a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint">GIOExtensionPoint</a>* <a class="link" href="gio-Extension-Points.html#g-io-extension-point-register" title="g_io_extension_point_register ()">g_io_extension_point_register</a> (const char *name);
void <a class="link" href="gio-Extension-Points.html#g-io-extension-point-set-required-type" title="g_io_extension_point_set_required_type ()">g_io_extension_point_set_required_type</a>
(<a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint">GIOExtensionPoint</a> *extension_point,
<a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"
>GType</a> type);
<a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GTypeClass"
>GTypeClass</a>* <a class="link" href="gio-Extension-Points.html#g-io-extension-ref-class" title="g_io_extension_ref_class ()">g_io_extension_ref_class</a> (<a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension">GIOExtension</a> *extension);
</pre>
</div>
<div class="refsect1" lang="en">
<a name="gio-Extension-Points.description"></a><h2>Description</h2>
<p>
<a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint"><span class="type">GIOExtensionPoint</span></a> provides a mechanism for modules to extend the
functionality of the library or application that loaded it in an
organized fashion.
</p>
<p>
An extension point is identified by a name, and it may optionally
require that any implementation must by of a certain type (or derived
thereof). Use <a class="link" href="gio-Extension-Points.html#g-io-extension-point-register" title="g_io_extension_point_register ()"><code class="function">g_io_extension_point_register()</code></a> to register an
extension point, and <a class="link" href="gio-Extension-Points.html#g-io-extension-point-set-required-type" title="g_io_extension_point_set_required_type ()"><code class="function">g_io_extension_point_set_required_type()</code></a> to
set a required type.
</p>
<p>
A module can implement an extension point by specifying the <a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"
><span class="type">GType</span></a>
that implements the functionality. Additionally, each implementation
of an extension point has a name, and a priority. Use
<a class="link" href="gio-Extension-Points.html#g-io-extension-point-implement" title="g_io_extension_point_implement ()"><code class="function">g_io_extension_point_implement()</code></a> to implement an extension point.
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
GIOExtensionPoint *ep;
/* Register an extension point */
ep = g_io_extension_point_register ("my-extension-point");
g_io_extension_point_set_required_type (ep, MY_TYPE_EXAMPLE);
</pre></div>
<p>
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
/* Implement an extension point */
G_DEFINE_TYPE (MyExampleImpl, my_example_impl, MY_TYPE_EXAMPLE);
g_io_extension_point_implement ("my-extension-point",
my_example_impl_get_type (),
"my-example",
10);
</pre></div>
<p>
</p>
<p>
It is up to the code that registered the extension point how
it uses the implementations that have been associated with it.
Depending on the use case, it may use all implementations, or
only the one with the highest priority, or pick a specific
one by name.</p>
<p>
</p>
</div>
<div class="refsect1" lang="en">
<a name="gio-Extension-Points.details"></a><h2>Details</h2>
<div class="refsect2" lang="en">
<a name="GIOExtension"></a><h3>GIOExtension</h3>
<pre class="programlisting">typedef struct _GIOExtension GIOExtension;</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="GIOExtensionPoint"></a><h3>GIOExtensionPoint</h3>
<pre class="programlisting">typedef struct _GIOExtensionPoint GIOExtensionPoint;</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g-io-extension-get-name"></a><h3>g_io_extension_get_name ()</h3>
<pre class="programlisting">const char* g_io_extension_get_name (<a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension">GIOExtension</a> *extension);</pre>
<p>
Gets the name under which <em class="parameter"><code>extension</code></em> was registered.
</p>
<p>
Note that the same type may be registered as extension
for multiple extension points, under different names.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>extension</code></em> :</span></p></td>
<td> a <a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension"><span class="type">GIOExtension</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the name of <em class="parameter"><code>extension</code></em>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g-io-extension-get-priority"></a><h3>g_io_extension_get_priority ()</h3>
<pre class="programlisting"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"
>gint</a> g_io_extension_get_priority (<a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension">GIOExtension</a> *extension);</pre>
<p>
Gets the priority with which <em class="parameter"><code>extension</code></em> was registered.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>extension</code></em> :</span></p></td>
<td> a <a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension"><span class="type">GIOExtension</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the priority of <em class="parameter"><code>extension</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g-io-extension-get-type"></a><h3>g_io_extension_get_type ()</h3>
<pre class="programlisting"><a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"
>GType</a> g_io_extension_get_type (<a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension">GIOExtension</a> *extension);</pre>
<p>
Gets the type associated with <em class="parameter"><code>extension</code></em>.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>extension</code></em> :</span></p></td>
<td> a <a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension"><span class="type">GIOExtension</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the type of <em class="parameter"><code>extension</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g-io-extension-point-get-extension-by-name"></a><h3>g_io_extension_point_get_extension_by_name ()</h3>
<pre class="programlisting"><a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension">GIOExtension</a>* g_io_extension_point_get_extension_by_name
(<a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint">GIOExtensionPoint</a> *extension_point,
const char *name);</pre>
<p>
Finds a <a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension"><span class="type">GIOExtension</span></a> for an extension point by name.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>extension_point</code></em> :</span></p></td>
<td> a <a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint"><span class="type">GIOExtensionPoint</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td> the name of the extension to get
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the <a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension"><span class="type">GIOExtension</span></a> for <em class="parameter"><code>extension_point</code></em> that has the
given name, or <a
href="/usr/share/gtk-doc/html/liboil/liboil-liboiljunk.html#NULL:CAPS"
><code class="literal">NULL</code></a> if there is no extension with that name
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g-io-extension-point-get-extensions"></a><h3>g_io_extension_point_get_extensions ()</h3>
<pre class="programlisting"><a
href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"
>GList</a>* g_io_extension_point_get_extensions (<a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint">GIOExtensionPoint</a> *extension_point);</pre>
<p>
Gets a list of all extensions that implement this extension point.
The list is sorted by priority, beginning with the highest priority.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>extension_point</code></em> :</span></p></td>
<td> a <a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint"><span class="type">GIOExtensionPoint</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> a <a
href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"
><span class="type">GList</span></a> of <a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension"><span class="type">GIOExtension</span></a>s. The list is owned by
GIO and should not be modified
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g-io-extension-point-get-required-type"></a><h3>g_io_extension_point_get_required_type ()</h3>
<pre class="programlisting"><a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"
>GType</a> g_io_extension_point_get_required_type
(<a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint">GIOExtensionPoint</a> *extension_point);</pre>
<p>
Gets the required type for <em class="parameter"><code>extension_point</code></em>.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>extension_point</code></em> :</span></p></td>
<td> a <a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint"><span class="type">GIOExtensionPoint</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the <a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"
><span class="type">GType</span></a> that all implementations must have,
or <a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#G-TYPE-INVALID:CAPS"
><span class="type">G_TYPE_INVALID</span></a> if the extension point has no required type
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g-io-extension-point-implement"></a><h3>g_io_extension_point_implement ()</h3>
<pre class="programlisting"><a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension">GIOExtension</a>* g_io_extension_point_implement (const char *extension_point_name,
<a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"
>GType</a> type,
const char *extension_name,
<a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"
>gint</a> priority);</pre>
<p>
Registers <em class="parameter"><code>type</code></em> as extension for the extension point with name
<em class="parameter"><code>extension_point_name</code></em>.
</p>
<p>
If <em class="parameter"><code>type</code></em> has already been registered as an extension for this
extension point, the existing <a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension"><span class="type">GIOExtension</span></a> object is returned.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>extension_point_name</code></em> :</span></p></td>
<td> the name of the extension point
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td> the <a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"
><span class="type">GType</span></a> to register as extension
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>extension_name</code></em> :</span></p></td>
<td> the name for the extension
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>priority</code></em> :</span></p></td>
<td> the priority for the extension
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> a <a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension"><span class="type">GIOExtension</span></a> object for <a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"
><span class="type">GType</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g-io-extension-point-lookup"></a><h3>g_io_extension_point_lookup ()</h3>
<pre class="programlisting"><a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint">GIOExtensionPoint</a>* g_io_extension_point_lookup (const char *name);</pre>
<p>
Looks up an existing extension point.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td> the name of the extension point
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the <a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint"><span class="type">GIOExtensionPoint</span></a>, or <a
href="/usr/share/gtk-doc/html/liboil/liboil-liboiljunk.html#NULL:CAPS"
><code class="literal">NULL</code></a> if there is no
registered extension point with the given name
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g-io-extension-point-register"></a><h3>g_io_extension_point_register ()</h3>
<pre class="programlisting"><a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint">GIOExtensionPoint</a>* g_io_extension_point_register (const char *name);</pre>
<p>
Registers an extension point.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td> The name of the extension point
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the new <a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint"><span class="type">GIOExtensionPoint</span></a>. This object is owned by GIO
and should not be freed
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g-io-extension-point-set-required-type"></a><h3>g_io_extension_point_set_required_type ()</h3>
<pre class="programlisting">void g_io_extension_point_set_required_type
(<a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint">GIOExtensionPoint</a> *extension_point,
<a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"
>GType</a> type);</pre>
<p>
Sets the required type for <em class="parameter"><code>extension_point</code></em> to <em class="parameter"><code>type</code></em>.
All implementations must henceforth have this type.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>extension_point</code></em> :</span></p></td>
<td> a <a class="link" href="gio-Extension-Points.html#GIOExtensionPoint" title="GIOExtensionPoint"><span class="type">GIOExtensionPoint</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td> the <a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"
><span class="type">GType</span></a> to require
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="g-io-extension-ref-class"></a><h3>g_io_extension_ref_class ()</h3>
<pre class="programlisting"><a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GTypeClass"
>GTypeClass</a>* g_io_extension_ref_class (<a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension">GIOExtension</a> *extension);</pre>
<p>
Gets a reference to the class for the type that is
associated with <em class="parameter"><code>extension</code></em>.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>extension</code></em> :</span></p></td>
<td> a <a class="link" href="gio-Extension-Points.html#GIOExtension" title="GIOExtension"><span class="type">GIOExtension</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the <a
href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GTypeClass"
><span class="type">GTypeClass</span></a> for the type of <em class="parameter"><code>extension</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1" lang="en">
<a name="gio-Extension-Points.see-also"></a><h2>See Also</h2>
Extending GIO
</div>
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