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Driver
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org.osgi.service.device</FONT>
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Interface Driver</H2>
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<DL>
<DT><PRE>public interface <B>Driver</B></DL>
</PRE>
<P>
A <code>Driver</code> service object must be registered by each Driver bundle
wishing to attach to Device services provided by other drivers. For each
newly discovered <A HREF="../../../../org/osgi/service/device/Device.html" title="interface in org.osgi.service.device"><CODE>Device</CODE></A> object, the device manager enters a bidding
phase. The <code>Driver</code> object whose <A HREF="../../../../org/osgi/service/device/Driver.html#match(org.osgi.framework.ServiceReference)"><CODE>match(ServiceReference)</CODE></A>
method bids the highest for a particular <code>Device</code> object will be
instructed by the device manager to attach to the <code>Device</code> object.
<P>
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/device/Device.html" title="interface in org.osgi.service.device"><CODE>Device</CODE></A>,
<A HREF="../../../../org/osgi/service/device/DriverLocator.html" title="interface in org.osgi.service.device"><CODE>DriverLocator</CODE></A></DL>
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<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/device/Driver.html#attach(org.osgi.framework.ServiceReference)">attach</A></B>(org.osgi.framework.ServiceReference reference)</CODE>
<BR>
Attaches this Driver service to the Device service represented by the
given <code>ServiceReference</code> object.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/device/Driver.html#match(org.osgi.framework.ServiceReference)">match</A></B>(org.osgi.framework.ServiceReference reference)</CODE>
<BR>
Checks whether this Driver service can be attached to the Device service.</TD>
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<A NAME="match(org.osgi.framework.ServiceReference)"><!-- --></A><H3>
match</H3>
<PRE>
int <B>match</B>(org.osgi.framework.ServiceReference reference)
throws java.lang.Exception</PRE>
<DL>
<DD>Checks whether this Driver service can be attached to the Device service.
The Device service is represented by the given <CODE>ServiceReference</CODE>
and returns a value indicating how well this driver can support the given
Device service, or <A HREF="../../../../org/osgi/service/device/Device.html#MATCH_NONE"><CODE>Device.MATCH_NONE</CODE></A> if it cannot support the
given Device service at all.
<p>
The return value must be one of the possible match values defined in the
device category definition for the given Device service, or
<code>Device.MATCH_NONE</code> if the category of the Device service is
not recognized.
<p>
In order to make its decision, this Driver service may examine the
properties associated with the given Device service, or may get the
referenced service object (representing the actual physical device) to
talk to it, as long as it ungets the service and returns the physical
device to a normal state before this method returns.
<p>
A Driver service must always return the same match code whenever it is
presented with the same Device service.
<p>
The match function is called by the device manager during the matching
process.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>reference</CODE> - the <code>ServiceReference</code> object of the device
to match
<DT><B>Returns:</B><DD>value indicating how well this driver can support the given
Device service, or <code>Device.MATCH_NONE</code> if it cannot
support the Device service at all
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if this Driver service cannot examine the
Device service</DL>
</DD>
</DL>
<HR>
<A NAME="attach(org.osgi.framework.ServiceReference)"><!-- --></A><H3>
attach</H3>
<PRE>
java.lang.String <B>attach</B>(org.osgi.framework.ServiceReference reference)
throws java.lang.Exception</PRE>
<DL>
<DD>Attaches this Driver service to the Device service represented by the
given <code>ServiceReference</code> object.
<p>
A return value of <code>null</code> indicates that this Driver service
has successfully attached to the given Device service. If this Driver
service is unable to attach to the given Device service, but knows of a
more suitable Driver service, it must return the <code>DRIVER_ID</code>
of that Driver service. This allows for the implementation of referring
drivers whose only purpose is to refer to other drivers capable of
handling a given Device service.
<p>
After having attached to the Device service, this driver may register the
underlying device as a new service exposing driver-specific
functionality.
<p>
This method is called by the device manager.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>reference</CODE> - the <code>ServiceReference</code> object of the device
to attach to
<DT><B>Returns:</B><DD><code>null</code> if this Driver service has successfully
attached to the given Device service, or the
<code>DRIVER_ID</code> of a more suitable driver
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if the driver cannot attach to the given
device and does not know of a more suitable driver</DL>
</DD>
</DL>
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