Create CredentialEvent interface for generic credentials-related events. Implemented AuthenticationFailureEvent.

guacamole-ext/src/main/java/net/sourceforge/guacamole/net/event/AuthenticationFailureEvent.java

@@ -0,0 +1,34 @@
+package net.sourceforge.guacamole.net.event;
+
+import net.sourceforge.guacamole.net.auth.Credentials;
+
+/**
+ * An event which is triggered whenever a user's credentials fail to be
+ * authenticated. The credentials that failed to be authenticated are included
+ * within this event, and can be retrieved using getCredentials().
+ * 
+ * @author Michael Jumper
+ */
+public class AuthenticationFailureEvent implements CredentialEvent {
+    
+    /**
+     * The credentials which failed authentication
+     */
+    private Credentials credentials;
+
+    /**
+     * Creates a new AuthenticationFailureEvent which represents the failure
+     * to authenticate the given credentials.
+     * 
+     * @param credentials The credentials which failed authentication.
+     */
+    public AuthenticationFailureEvent(Credentials credentials) {
+        this.credentials = credentials;
+    }
+   
+    @Override
+    public Credentials getCredentials() {
+        return credentials;
+    }
+    
+}

guacamole-ext/src/main/java/net/sourceforge/guacamole/net/event/CredentialEvent.java

@@ -0,0 +1,21 @@
+package net.sourceforge.guacamole.net.event;
+
+import net.sourceforge.guacamole.net.auth.Credentials;
+
+/**
+ * Abstract basis for events which may have associated user credentials when
+ * triggered.
+ * 
+ * @author Michael Jumper
+ */
+public interface CredentialEvent {
+   
+    /**
+     * Returns the current credentials of the user triggering the event, if any.
+     * 
+     * @return The current credentials of the user triggering the event, if
+     *         any, or null if no credentials are associated with the event.
+     */
+    public Credentials getCredentials();
+
+}