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<h3 class="sectionHead"><span class="titlemark">10 </span> <a
id="x32-3500010"></a>CreateInterface</h3>
<!--l. 833--><p class="noindent" >D-Bus provides a method to get introspection data on a remote object, which describes
the interfaces, methods and signals it provides. This introspection data is in XML
format<span class="footnote-mark"><a
href="dbus-java33.html#fn19x0"><sup class="textsuperscript">19</sup></a></span><a
id="x32-35001f19"></a> .
The library automatically provides XML introspection data on all objects which are
exported by it. Introspection data can be used to create Java interface definitions
automatically.
</p><!--l. 841--><p class="indent" > The <span
class="cmtt-12">CreateInterface</span><span class="footnote-mark"><a
href="dbus-java34.html#fn20x0"><sup class="textsuperscript">20</sup></a></span><a
id="x32-35002f20"></a>
class will automatically create Java source files from an XML file containing the introspection
data, or by querying the remote object over D-Bus. CreateInterface can be called from Java
code, or can be run as a stand alone program.
</p><!--l. 848--><p class="indent" > The syntax for the CreateInterface program is
</p>
<div class="verbatim" id="verbatim-24">
CreateInterface [--system] [--session] [--create-files]
 <br />                  <bus name> <object>
 <br />CreateInterface [--create-files] <introspection-file.xml>
</div>
<!--l. 854--><p class="nopar" >
</p><!--l. 856--><p class="indent" > The Java source code interfaces will be written to the standard ouput. If the
<span
class="cmtt-12">--create-files </span>option is specified the correct files in the correct directory structure will be
created.
</p>
<h4 class="subsectionHead"><span class="titlemark">10.1 </span> <a
id="x32-3600010.1"></a>Nested Interfaces</h4>
<!--l. 862--><p class="noindent" >In some cases there are nested interfaces. In this case CreateInterface will not correctly create
the Java equivalent. This is because Java cannot have both a class and a package
with the same name. The solution to this is to create nested classes in the same
file.
</p><!--l. 867--><p class="indent" > An example would be the Hal interface:
</p>
<div class="verbatim" id="verbatim-25">
<interface name="org.freedesktop.Hal.Device">
 <br />   ...
 <br /></interface>
 <br /><interface name="org.freedesktop.Hal.Device.Volume">
 <br />   ...
 <br /></interface>
</div>
<!--l. 876--><p class="nopar" >
</p><!--l. 878--><p class="indent" > When converted to Java you would just have one file <span
class="cmtt-12">org/freedesktop/Hal/Device.java</span>
in the package <span
class="cmtt-12">org.freedesktop.Hal</span>, which would contain one class and one nested
class:
</p>
<div class="verbatim" id="verbatim-26">
public interface Device extends DBusInterface {
 <br />   public interface Volume extends DBusInterface {
 <br />      ... methods in Volume ...
 <br />   }
 <br />   ... methods in Device ...
 <br />}
</div>
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