Added Kryo serializers for Ip4Address, Ip6Address, Ip4Prefix, Ip6Prefix

Change-Id: Ib014bbe40b3df5c778e2d16d7b65b1cb62944e1c
diff --git a/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/Ip6PrefixSerializer.java b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/Ip6PrefixSerializer.java
new file mode 100644
index 0000000..8ecd13a
--- /dev/null
+++ b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/Ip6PrefixSerializer.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2014 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.onlab.onos.store.serializers;
+
+import org.onlab.packet.Ip6Prefix;
+
+import com.esotericsoftware.kryo.Kryo;
+import com.esotericsoftware.kryo.Serializer;
+import com.esotericsoftware.kryo.io.Input;
+import com.esotericsoftware.kryo.io.Output;
+
+/**
+ * Kryo Serializer for {@link Ip6Prefix}.
+ */
+public final class Ip6PrefixSerializer extends Serializer<Ip6Prefix> {
+
+    /**
+     * Creates {@link Ip6Prefix} serializer instance.
+     */
+    public Ip6PrefixSerializer() {
+        // non-null, immutable
+        super(false, true);
+    }
+
+    @Override
+    public void write(Kryo kryo, Output output,
+            Ip6Prefix object) {
+        byte[] octs = object.address().toOctets();
+        // TODO: Writing (and reading) the number of octets is redundant:
+        // It is always Ip6Address.BYTE_LENGTH
+        output.writeInt(octs.length);
+        output.writeBytes(octs);
+        output.writeInt(object.prefixLength());
+    }
+
+    @Override
+    public Ip6Prefix read(Kryo kryo, Input input,
+            Class<Ip6Prefix> type) {
+        int octLen = input.readInt();
+        byte[] octs = new byte[octLen];
+        input.readBytes(octs);
+        int prefLen = input.readInt();
+        return Ip6Prefix.valueOf(octs, prefLen);
+    }
+}