Adds .service.neomedia.AbstractMediaStream to take on the base functionality of MediaStream which is likely to be common for most implementations.

src/net/java/sip/communicator/service/neomedia/AbstractMediaStream.java

@@ -0,0 +1,67 @@
+/*
+ * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package net.java.sip.communicator.service.neomedia;
+
+import net.java.sip.communicator.util.*;
+
+/**
+ * Abstract base implementation of <tt>MediaStream</tt> to ease the
+ * implementation of the interface.
+ *
+ * @author Lubomir Marinov
+ */
+public abstract class AbstractMediaStream
+    implements MediaStream
+{
+
+    /**
+     * The delegate of this instance which implements support for property
+     * change notifications for its
+     * {@link #addPropertyChangeListener(PropertyChangeListener)} and
+     * {@link #removePropertyChangeListener(PropertyChangeListener)}.
+     */
+    private final PropertyChangeSupport propertyChangeSupport
+        = new PropertyChangeSupport(this);
+
+    /*
+     * Implements MediaStream#addPropertyChangeListener(PropertyChangeListener).
+     */
+    public void addPropertyChangeListener(PropertyChangeListener listener)
+    {
+        propertyChangeSupport.addPropertyChangeListener(listener);
+    }
+
+    /**
+     * Fires a new <tt>PropertyChangeEvent</tt> to the
+     * <tt>PropertyChangeListener</tt>s registered with this instance in order
+     * to notify about a change in the value of a specific property which had
+     * its old value modified to a specific new value.
+     * 
+     * @param property the name of the property of this instance which had its
+     * value changed
+     * @param oldValue the value of the property with the specified name before
+     * the change
+     * @param newValue the value of the property with the specified name after
+     * the change
+     */
+    protected void firePropertyChange(
+        String property,
+        Object oldValue,
+        Object newValue)
+    {
+        propertyChangeSupport.firePropertyChange(property, oldValue, newValue);
+    }
+
+    /*
+     * Implements
+     * MediaStream#removePropertyChangeListener(PropertyChangeListener).
+     */
+    public void removePropertyChangeListener(PropertyChangeListener listener)
+    {
+        propertyChangeSupport.removePropertyChangeListener(listener);
+    }
+}