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diff --git a/src/net/java/sip/communicator/impl/osdependent/systemtray/appindicator/Gobject.java b/src/net/java/sip/communicator/impl/osdependent/systemtray/appindicator/Gobject.java
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+/*
+ * Jitsi, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Copyright @ 2015 Atlassian Pty Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.java.sip.communicator.impl.osdependent.systemtray.appindicator;
+
+import java.util.*;
+
+import com.sun.jna.*;
+
+/**
+ * JNA mappings for GTK GObject types that are required for the tray menu.
+ * 
+ * @author Ingo Bauersachs
+ */
+interface Gobject extends Library
+{
+    static final Gobject INSTANCE =
+        (Gobject) Native.loadLibrary("gobject-2.0", Gobject.class);
+
+    interface SignalHandler extends Callback
+    {
+        void signal(Pointer widget, Pointer data);
+    }
+
+    /**
+     * Connects a GCallback function to a signal for a particular object.
+     * Similar to g_signal_connect(), but allows to provide a GClosureNotify for
+     * the data which will be called when the signal handler is disconnected and
+     * no longer used. Specify connect_flags if you need ..._after() or
+     * ..._swapped() variants of this function.
+     * 
+     * @param instance the instance to connect to.
+     * @param detailed_signal a string of the form "signal-name::detail".
+     * @param c_handler the GCallback to connect.
+     * @param data data to pass to c_handler calls.
+     * @param destroy_data a GClosureNotify for data.
+     * @param connect_flags a combination of GConnectFlags.
+     * 
+     * @return the handler id (always greater than 0 for successful connections)
+     */
+    long g_signal_connect_data(Pointer instance, String detailed_signal,
+        SignalHandler c_handler, Pointer data, Pointer destroy_data,
+        int connect_flags);
+    
+    /**
+     * Disconnects a handler from an instance so it will not be called during
+     * any future or currently ongoing emissions of the signal it has been
+     * connected to. The handler_id becomes invalid and may be reused. The
+     * handler_id has to be a valid signal handler id, connected to a signal of
+     * instance .
+     * 
+     * @param instance The instance to remove the signal handler from.
+     * @param handler_id Handler id of the handler to be disconnected.
+     */
+    void g_signal_handler_disconnect(Pointer instance, long handler_id); 
+
+    /**
+     * Decreases the reference count of object. When its reference count drops
+     * to 0, the object is finalized (i.e. its memory is freed). If the pointer
+     * to the GObject may be reused in future (for example, if it is an instance
+     * variable of another object), it is recommended to clear the pointer to
+     * NULL rather than retain a dangling pointer to a potentially invalid
+     * GObject instance. Use g_clear_object() for this.
+     * 
+     * @param object a GObject.
+     */
+    void g_object_unref(Pointer object);
+
+    /**
+     * Increases the reference count of object.
+     * 
+     * @param object a GObject.
+     * @return the same object.
+     */
+    Pointer g_object_ref(Pointer object);
+}