Initial import of CFM and SOAM api

Change-Id: Icf5cc2d5fb34b75460e80e8cced0d70265bcd33b
diff --git a/apps/cfm/src/main/java/org/onosproject/soam/web/LossMeasurementStatHistoryCodec.java b/apps/cfm/src/main/java/org/onosproject/soam/web/LossMeasurementStatHistoryCodec.java
new file mode 100644
index 0000000..e4ec282
--- /dev/null
+++ b/apps/cfm/src/main/java/org/onosproject/soam/web/LossMeasurementStatHistoryCodec.java
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * 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.soam.web;
+
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.incubator.net.l2monitoring.soam.loss.LossMeasurementStatHistory;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Encode and decode to/from JSON to LossMeasurementStatHistory object.
+ */
+public class LossMeasurementStatHistoryCodec extends JsonCodec<LossMeasurementStatHistory> {
+
+    @Override
+    public ObjectNode encode(LossMeasurementStatHistory lmHistory, CodecContext context) {
+        checkNotNull(lmHistory, "LM history cannot be null");
+        ObjectNode result = context.mapper().createObjectNode()
+                .put("historyId", String.valueOf(lmHistory.historyStatsId()))
+                .put("endTime", lmHistory.endTime().toString());
+        ObjectNode resultAbstract = new LossMeasurementStatCodec().encode(lmHistory, context);
+        result.setAll(resultAbstract);
+        return result;
+    }
+
+    @Override
+    public ArrayNode encode(Iterable<LossMeasurementStatHistory> historyEntities, CodecContext context) {
+        ArrayNode an = context.mapper().createArrayNode();
+        historyEntities.forEach(history -> an.add(encode(history, context)));
+        return an;
+    }
+}