base for mastership term implementation

Change-Id: Ie354096ad8835536839e3c1504e19a2cbff866c1
diff --git a/core/api/src/main/java/org/onlab/onos/cluster/MastershipTerm.java b/core/api/src/main/java/org/onlab/onos/cluster/MastershipTerm.java
index 5c3c424..f11dafd 100644
--- a/core/api/src/main/java/org/onlab/onos/cluster/MastershipTerm.java
+++ b/core/api/src/main/java/org/onlab/onos/cluster/MastershipTerm.java
@@ -1,6 +1,46 @@
 package org.onlab.onos.cluster;
 
-public class MastershipTerm {
-    private final NodeId master = null;
+import java.util.Objects;
+
+public final class MastershipTerm {
+
+    private final NodeId master;
     private int termNumber;
+
+    private MastershipTerm(NodeId master, int term) {
+        this.master = master;
+        this.termNumber = term;
+    }
+
+    public static MastershipTerm of(NodeId master, int term) {
+        return new MastershipTerm(master, term);
+    }
+
+    public NodeId master() {
+        return master;
+    }
+
+    public int termNumber() {
+        return termNumber;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(master, termNumber);
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (other instanceof MastershipTerm) {
+            MastershipTerm that = (MastershipTerm) other;
+            if (!this.master.equals(that.master)) {
+                return false;
+            }
+            if (this.termNumber != that.termNumber) {
+                return false;
+            }
+            return true;
+        }
+        return false;
+    }
 }