Distributed group store using eventual consistent map abstraction

Change-Id: I618a0f6fa80e0e25285d7a2026032f09ba90aa70
diff --git a/core/api/src/main/java/org/onosproject/net/group/DefaultGroupKey.java b/core/api/src/main/java/org/onosproject/net/group/DefaultGroupKey.java
new file mode 100644
index 0000000..7f00ae7
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/group/DefaultGroupKey.java
@@ -0,0 +1,55 @@
+/*
+ * 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.group;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.util.Arrays;
+
+/**
+ * Default implementation of group key interface.
+ */
+public class DefaultGroupKey implements GroupKey {
+
+    private final byte[] key;
+
+    public DefaultGroupKey(byte[] key) {
+        this.key = checkNotNull(key);
+    }
+
+    @Override
+    public byte[] key() {
+        return key;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof DefaultGroupKey)) {
+            return false;
+        }
+        DefaultGroupKey that = (DefaultGroupKey) o;
+        return (Arrays.equals(this.key, that.key));
+    }
+
+    @Override
+    public int hashCode() {
+        return Arrays.hashCode(this.key);
+    }
+
+}
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