Segmented plugin interfaces should extend general plugin interfaces.

api/net/sf/briar/api/plugins/duplex/DuplexSegmentedPlugin.java

 package net.sf.briar.api.plugins.duplex;
 
 import net.sf.briar.api.ContactId;
+import net.sf.briar.api.plugins.Plugin;
 
 /**
  * An interface for transport plugins that support duplex segmented
  * communication.
  */
-public interface DuplexSegmentedPlugin {
+public interface DuplexSegmentedPlugin extends Plugin {
 
 	/**
 	 * Attempts to create and return a connection to the given contact using

api/net/sf/briar/api/plugins/duplex/DuplexSegmentedPluginCallback.java

 package net.sf.briar.api.plugins.duplex;
 
 import net.sf.briar.api.ContactId;
+import net.sf.briar.api.plugins.PluginCallback;
 
 /**
  * An interface for handling connections created by a duplex segmented
  * transport plugin.
  */
-public interface DuplexSegmentedPluginCallback {
+public interface DuplexSegmentedPluginCallback extends PluginCallback {
 
 	void incomingConnectionCreated(DuplexSegmentedTransportConnection d);
 

api/net/sf/briar/api/plugins/simplex/SimplexSegmentedPlugin.java

 package net.sf.briar.api.plugins.simplex;
 
 import net.sf.briar.api.ContactId;
+import net.sf.briar.api.plugins.Plugin;
 
 /**
  * An interface for transport plugins that support simplex segmented
  * communication.
  */
-public interface SimplexSegmentedPlugin {
+public interface SimplexSegmentedPlugin extends Plugin {
 
 	/**
 	 * Attempts to create and return a reader for the given contact using the

api/net/sf/briar/api/plugins/simplex/SimplexSegmentedPluginCallback.java

 package net.sf.briar.api.plugins.simplex;
 
 import net.sf.briar.api.ContactId;
+import net.sf.briar.api.plugins.PluginCallback;
 
 /**
  * An interface for handling readers and writers created by a simplex
  * segmented transport plugin.
  */
-public interface SimplexSegmentedPluginCallback {
+public interface SimplexSegmentedPluginCallback extends PluginCallback {
 
 	void readerCreated(SimplexSegmentedTransportReader r);