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ComponentContext
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org.osgi.service.component</FONT>
<BR>
Interface ComponentContext</H2>
<HR>
<DL>
<DT><PRE>public interface <B>ComponentContext</B></DL>
</PRE>

<P>
A Component Context object is used by a component instance to interact with
 its execution context including locating services by reference name. Each
 component instance has a unique Component Context.
 
 <p>
 A component instance may have an activate method. If a component instance has
 a suitable and accessible activate method, this method will be called when a
 component configuration is activated. If the activate method takes a
 <code>ComponentContext</code> argument, it will be passed the component
 instance's Component Context object. If the activate method takes a
 <code>BundleContext</code> argument, it will be passed the component
 instance's Bundle Context object. If the activate method takes a
 <code>Map</code> argument, it will be passed an unmodifiable Map containing
 the component properties.
 
 <p>
 A component instance may have a deactivate method. If a component instance
 has a suitable and accessible deactivate method, this method will be called
 when the component configuration is deactivated. If the deactivate method
 takes a <code>ComponentContext</code> argument, it will be passed the
 component instance's Component Context object. If the deactivate method takes
 a <code>BundleContext</code> argument, it will be passed the component
 instance's Bundle Context object. If the deactivate method takes a
 <code>Map</code> argument, it will be passed an unmodifiable Map containing
 the component properties. If the deactivate method takes an <code>int</code>
 or <code>Integer</code> argument, it will be passed the reason code for the
 component instance's deactivation.
<P>

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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/component/ComponentContext.html#disableComponent(java.lang.String)">disableComponent</A></B>(java.lang.String&nbsp;name)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Disables the specified component name.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/component/ComponentContext.html#enableComponent(java.lang.String)">enableComponent</A></B>(java.lang.String&nbsp;name)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Enables the specified component name.</TD>
</TR>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;org.osgi.framework.BundleContext</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/component/ComponentContext.html#getBundleContext()">getBundleContext</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the <code>BundleContext</code> of the bundle which contains this
 component.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../org/osgi/service/component/ComponentInstance.html" title="interface in org.osgi.service.component">ComponentInstance</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/component/ComponentContext.html#getComponentInstance()">getComponentInstance</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the Component Instance object for the component instance
 associated with this Component Context.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.util.Dictionary</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/component/ComponentContext.html#getProperties()">getProperties</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the component properties for this Component Context.</TD>
</TR>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;org.osgi.framework.ServiceReference</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/component/ComponentContext.html#getServiceReference()">getServiceReference</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If the component instance is registered as a service using the
 <code>service</code> element, then this method returns the service
 reference of the service provided by this component instance.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;org.osgi.framework.Bundle</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/component/ComponentContext.html#getUsingBundle()">getUsingBundle</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If the component instance is registered as a service using the
 <code>servicefactory=&amp;quot;true&amp;quot;</code> attribute, then this method
 returns the bundle using the service provided by the component instance.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/component/ComponentContext.html#locateService(java.lang.String)">locateService</A></B>(java.lang.String&nbsp;name)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the service object for the specified reference name.</TD>
</TR>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/component/ComponentContext.html#locateService(java.lang.String, org.osgi.framework.ServiceReference)">locateService</A></B>(java.lang.String&nbsp;name,
              org.osgi.framework.ServiceReference&nbsp;reference)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the service object for the specified reference name and
 <code>ServiceReference</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.lang.Object[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/component/ComponentContext.html#locateServices(java.lang.String)">locateServices</A></B>(java.lang.String&nbsp;name)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the service objects for the specified reference name.</TD>
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<A NAME="getProperties()"><!-- --></A><H3>
getProperties</H3>
<PRE>
java.util.Dictionary <B>getProperties</B>()</PRE>
<DL>
<DD>Returns the component properties for this Component Context.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>The properties for this Component Context. The Dictionary is read
         only and cannot be modified.</DL>
</DD>
</DL>
<HR>

<A NAME="locateService(java.lang.String)"><!-- --></A><H3>
locateService</H3>
<PRE>
java.lang.Object <B>locateService</B>(java.lang.String&nbsp;name)</PRE>
<DL>
<DD>Returns the service object for the specified reference name.
 
 <p>
 If the cardinality of the reference is <code>0..n</code> or
 <code>1..n</code> and multiple services are bound to the reference, the
 service with the highest ranking (as specified in its
 <code>Constants.SERVICE_RANKING</code> property) is returned. If there is
 a tie in ranking, the service with the lowest service ID (as specified in
 its <code>Constants.SERVICE_ID</code> property); that is, the service
 that was registered first is returned.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - The name of a reference as specified in a
        <code>reference</code> element in this component's description.
<DT><B>Returns:</B><DD>A service object for the referenced service or <code>null</code>
         if the reference cardinality is <code>0..1</code> or
         <code>0..n</code> and no bound service is available.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../org/osgi/service/component/ComponentException.html" title="class in org.osgi.service.component">ComponentException</A></CODE> - If the Service Component Runtime catches an
         exception while activating the bound service.</DL>
</DD>
</DL>
<HR>

<A NAME="locateService(java.lang.String, org.osgi.framework.ServiceReference)"><!-- --></A><H3>
locateService</H3>
<PRE>
java.lang.Object <B>locateService</B>(java.lang.String&nbsp;name,
                               org.osgi.framework.ServiceReference&nbsp;reference)</PRE>
<DL>
<DD>Returns the service object for the specified reference name and
 <code>ServiceReference</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - The name of a reference as specified in a
        <code>reference</code> element in this component's description.<DD><CODE>reference</CODE> - The <code>ServiceReference</code> to a bound service.
        This must be a <code>ServiceReference</code> provided to the
        component via the bind or unbind method for the specified
        reference name.
<DT><B>Returns:</B><DD>A service object for the referenced service or <code>null</code>
         if the specified <code>ServiceReference</code> is not a bound
         service for the specified reference name.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../org/osgi/service/component/ComponentException.html" title="class in org.osgi.service.component">ComponentException</A></CODE> - If the Service Component Runtime catches an
         exception while activating the bound service.</DL>
</DD>
</DL>
<HR>

<A NAME="locateServices(java.lang.String)"><!-- --></A><H3>
locateServices</H3>
<PRE>
java.lang.Object[] <B>locateServices</B>(java.lang.String&nbsp;name)</PRE>
<DL>
<DD>Returns the service objects for the specified reference name.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - The name of a reference as specified in a
        <code>reference</code> element in this component's description.
<DT><B>Returns:</B><DD>An array of service objects for the referenced service or
         <code>null</code> if the reference cardinality is
         <code>0..1</code> or <code>0..n</code> and no bound service is
         available. If the reference cardinality is <code>0..1</code> or
         <code>1..1</code> and a bound service is available, the array
         will have exactly one element.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../org/osgi/service/component/ComponentException.html" title="class in org.osgi.service.component">ComponentException</A></CODE> - If the Service Component Runtime catches an
         exception while activating a bound service.</DL>
</DD>
</DL>
<HR>

<A NAME="getBundleContext()"><!-- --></A><H3>
getBundleContext</H3>
<PRE>
org.osgi.framework.BundleContext <B>getBundleContext</B>()</PRE>
<DL>
<DD>Returns the <code>BundleContext</code> of the bundle which contains this
 component.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>The <code>BundleContext</code> of the bundle containing this
         component.</DL>
</DD>
</DL>
<HR>

<A NAME="getUsingBundle()"><!-- --></A><H3>
getUsingBundle</H3>
<PRE>
org.osgi.framework.Bundle <B>getUsingBundle</B>()</PRE>
<DL>
<DD>If the component instance is registered as a service using the
 <code>servicefactory=&amp;quot;true&amp;quot;</code> attribute, then this method
 returns the bundle using the service provided by the component instance.
 <p>
 This method will return <code>null</code> if:
 <ul>
 <li>The component instance is not a service, then no bundle can be using
 it as a service.
 <li>The component instance is a service but did not specify the
 <code>servicefactory=&amp;quot;true&amp;quot;</code> attribute, then all bundles
 using the service provided by the component instance will share the same
 component instance.
 <li>The service provided by the component instance is not currently being
 used by any bundle.
 </ul>
<P>
<DD><DL>

<DT><B>Returns:</B><DD>The bundle using the component instance as a service or
         <code>null</code>.</DL>
</DD>
</DL>
<HR>

<A NAME="getComponentInstance()"><!-- --></A><H3>
getComponentInstance</H3>
<PRE>
<A HREF="../../../../org/osgi/service/component/ComponentInstance.html" title="interface in org.osgi.service.component">ComponentInstance</A> <B>getComponentInstance</B>()</PRE>
<DL>
<DD>Returns the Component Instance object for the component instance
 associated with this Component Context.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>The Component Instance object for the component instance.</DL>
</DD>
</DL>
<HR>

<A NAME="enableComponent(java.lang.String)"><!-- --></A><H3>
enableComponent</H3>
<PRE>
void <B>enableComponent</B>(java.lang.String&nbsp;name)</PRE>
<DL>
<DD>Enables the specified component name. The specified component name must
 be in the same bundle as this component.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - The name of a component or <code>null</code> to indicate all
        components in the bundle.</DL>
</DD>
</DL>
<HR>

<A NAME="disableComponent(java.lang.String)"><!-- --></A><H3>
disableComponent</H3>
<PRE>
void <B>disableComponent</B>(java.lang.String&nbsp;name)</PRE>
<DL>
<DD>Disables the specified component name. The specified component name must
 be in the same bundle as this component.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - The name of a component.</DL>
</DD>
</DL>
<HR>

<A NAME="getServiceReference()"><!-- --></A><H3>
getServiceReference</H3>
<PRE>
org.osgi.framework.ServiceReference <B>getServiceReference</B>()</PRE>
<DL>
<DD>If the component instance is registered as a service using the
 <code>service</code> element, then this method returns the service
 reference of the service provided by this component instance.
 <p>
 This method will return <code>null</code> if the component instance is
 not registered as a service.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>The <code>ServiceReference</code> object for the component
         instance or <code>null</code> if the component instance is not
         registered as a service.</DL>
</DD>
</DL>
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