Create a formal interface between the RIB and FIB.

 * IntentSynchronizer implements a more generalized FibListener interface
 * Updates to the FIB are signalled with FibUpdate to any FibListeners
 * generateRouteIntent logic has been pushed down into the IntentSynchronizer

Change-Id: I6f0ccfd52ee4e16ce9974af5ee549d4ede6c2d0e
diff --git a/apps/sdnip/src/main/java/org/onosproject/sdnip/FibUpdate.java b/apps/sdnip/src/main/java/org/onosproject/sdnip/FibUpdate.java
new file mode 100644
index 0000000..a3d8c3c
--- /dev/null
+++ b/apps/sdnip/src/main/java/org/onosproject/sdnip/FibUpdate.java
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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 org.onosproject.sdnip;
+
+/**
+ * Represents a change to the Forwarding Information Base (FIB).
+ */
+public class FibUpdate {
+
+    /**
+     * Specifies the type of the FIB update.
+     */
+    public enum Type {
+        /**
+         * The update contains a new or updated FIB entry for a prefix.
+         */
+        UPDATE,
+
+        /**
+         * The update signals that a prefix should be removed from the FIB.
+         */
+        DELETE
+    }
+
+    private final Type type;
+    private final FibEntry entry;
+
+    /**
+     * Creates a new FIB update.
+     *
+     * @param type type of the update
+     * @param entry FIB entry describing the update
+     */
+    public FibUpdate(Type type, FibEntry entry) {
+        this.type = type;
+        this.entry = entry;
+    }
+
+    /**
+     * Returns the type of the update.
+     *
+     * @return update type
+     */
+    public Type type() {
+        return type;
+    }
+
+    /**
+     * Returns the FIB entry which contains update information.
+     *
+     * @return the FIB entry
+     */
+    public FibEntry entry() {
+        return entry;
+    }
+}