Define Lambda interface representing wavelength and implementations

Two Lambda implementations are defined.
- IndexedLambda
- OchSignal

Change-Id: I36763390f61abd9f861e76edab63f558ae97e8a2
diff --git a/core/api/src/test/java/org/onosproject/net/IndexedLambdaTest.java b/core/api/src/test/java/org/onosproject/net/IndexedLambdaTest.java
new file mode 100644
index 0000000..b08d995
--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/net/IndexedLambdaTest.java
@@ -0,0 +1,29 @@
+/*
+ * 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.net;
+
+import com.google.common.testing.EqualsTester;
+import org.junit.Test;
+
+public class IndexedLambdaTest {
+    @Test
+    public void testEquality() {
+        new EqualsTester()
+                .addEqualityGroup(Lambda.indexedLambda(10), Lambda.indexedLambda(10))
+                .addEqualityGroup(Lambda.indexedLambda(11), Lambda.indexedLambda(11), Lambda.indexedLambda(11))
+                .testEquals();
+    }
+}