[ONOS-6170] Implement codec for MappingValue with unit test

Change-Id: Id343fb26245756283b23e315d85499fc08853929
diff --git a/apps/mappingmanagement/web/src/main/java/org/onosproject/mapping/web/MappingCodecRegistrator.java b/apps/mappingmanagement/web/src/main/java/org/onosproject/mapping/web/MappingCodecRegistrator.java
index 0621e19..89f82d9 100644
--- a/apps/mappingmanagement/web/src/main/java/org/onosproject/mapping/web/MappingCodecRegistrator.java
+++ b/apps/mappingmanagement/web/src/main/java/org/onosproject/mapping/web/MappingCodecRegistrator.java
@@ -23,6 +23,7 @@
 import org.onosproject.codec.CodecService;
 import org.onosproject.mapping.MappingKey;
 import org.onosproject.mapping.MappingTreatment;
+import org.onosproject.mapping.MappingValue;
 import org.onosproject.mapping.actions.MappingAction;
 import org.onosproject.mapping.addresses.MappingAddress;
 import org.onosproject.mapping.instructions.MappingInstruction;
@@ -31,6 +32,7 @@
 import org.onosproject.mapping.web.codec.MappingInstructionCodec;
 import org.onosproject.mapping.web.codec.MappingKeyCodec;
 import org.onosproject.mapping.web.codec.MappingTreatmentCodec;
+import org.onosproject.mapping.web.codec.MappingValueCodec;
 import org.slf4j.Logger;
 
 import static org.slf4j.LoggerFactory.getLogger;
@@ -53,6 +55,7 @@
         codecService.registerCodec(MappingAction.class, new MappingActionCodec());
         codecService.registerCodec(MappingTreatment.class, new MappingTreatmentCodec());
         codecService.registerCodec(MappingKey.class, new MappingKeyCodec());
+        codecService.registerCodec(MappingValue.class, new MappingValueCodec());
 
         log.info("Started");
     }
@@ -64,6 +67,7 @@
         codecService.unregisterCodec(MappingAction.class);
         codecService.unregisterCodec(MappingTreatment.class);
         codecService.unregisterCodec(MappingKey.class);
+        codecService.unregisterCodec(MappingValue.class);
 
         log.info("Stopped");
     }
diff --git a/apps/mappingmanagement/web/src/main/java/org/onosproject/mapping/web/codec/MappingValueCodec.java b/apps/mappingmanagement/web/src/main/java/org/onosproject/mapping/web/codec/MappingValueCodec.java
new file mode 100644
index 0000000..a354a8a
--- /dev/null
+++ b/apps/mappingmanagement/web/src/main/java/org/onosproject/mapping/web/codec/MappingValueCodec.java
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2017-present 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.mapping.web.codec;
+
+import com.fasterxml.jackson.databind.JsonNode;
+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.mapping.DefaultMappingValue;
+import org.onosproject.mapping.MappingTreatment;
+import org.onosproject.mapping.MappingValue;
+import org.onosproject.mapping.actions.MappingAction;
+
+import java.util.stream.IntStream;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Mapping value codec.
+ */
+public final class MappingValueCodec extends JsonCodec<MappingValue> {
+
+    protected static final String ACTION = "action";
+    protected static final String TREATMENTS = "treatments";
+
+    @Override
+    public ObjectNode encode(MappingValue value, CodecContext context) {
+        checkNotNull(value, "Mapping value cannot be null");
+
+        final ObjectNode result = context.mapper().createObjectNode();
+        final ArrayNode jsonTreatments = result.putArray(TREATMENTS);
+
+        final JsonCodec<MappingTreatment> treatmentCodec =
+                context.codec(MappingTreatment.class);
+
+        final JsonCodec<MappingAction> actionCodec =
+                context.codec(MappingAction.class);
+
+        for (final MappingTreatment treatment : value.treatments()) {
+            jsonTreatments.add(treatmentCodec.encode(treatment, context));
+        }
+
+        result.set(ACTION, actionCodec.encode(value.action(), context));
+
+        return result;
+    }
+
+    @Override
+    public MappingValue decode(ObjectNode json, CodecContext context) {
+        if (json == null || !json.isObject()) {
+            return null;
+        }
+
+        final JsonCodec<MappingTreatment> treatmentCodec =
+                context.codec(MappingTreatment.class);
+
+        JsonNode treatmentJson = json.get(TREATMENTS);
+        MappingValue.Builder builder = DefaultMappingValue.builder();
+
+        if (treatmentJson != null) {
+            IntStream.range(0, treatmentJson.size())
+                    .forEach(i -> builder.add(
+                            treatmentCodec.decode(get(treatmentJson, i),
+                                    context)));
+        }
+
+        ObjectNode actionJson = get(json, ACTION);
+        if (actionJson != null) {
+            final JsonCodec<MappingAction> actionCodec =
+                    context.codec(MappingAction.class);
+            builder.withAction(actionCodec.decode(actionJson, context));
+        }
+
+        return builder.build();
+    }
+}