Refactored cross connect helpers to optical drivers package.

Change-Id: Iae23025cf0b33c51123911f3ff1249cabc812be2
diff --git a/drivers/optical/src/main/java/org/onosproject/driver/optical/flowrule/CrossConnect.java b/drivers/optical/src/main/java/org/onosproject/driver/optical/flowrule/CrossConnect.java
new file mode 100644
index 0000000..b1131ac
--- /dev/null
+++ b/drivers/optical/src/main/java/org/onosproject/driver/optical/flowrule/CrossConnect.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2017-present 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.driver.optical.flowrule;
+
+import org.onosproject.net.OchSignal;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.flow.FlowRule;
+
+/**
+ * Interface for cross connects as common in optical networking.
+ */
+public interface CrossConnect extends FlowRule {
+    /**
+     * Returns the add/drop port of the cross connect.
+     *
+     * @return port number
+     */
+    PortNumber addDrop();
+
+    /**
+     * Returns the wavelength of the cross connect.
+     *
+     * @return OCh signal
+     */
+    OchSignal ochSignal();
+
+    /**
+     * Returns true if cross connect is adding traffic.
+     *
+     * @return true if add rule, false if drop rule
+     */
+    boolean isAddRule();
+}