Fix: Split codec package into api module to fix maven build failure

Change-Id: I5f57163f329ab21bb362dcf2bef54a3a6664ce10
diff --git a/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/codec/MappingActionCodec.java b/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/codec/MappingActionCodec.java
new file mode 100644
index 0000000..511f862
--- /dev/null
+++ b/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/codec/MappingActionCodec.java
@@ -0,0 +1,54 @@
+/*
+ * 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.codec;
+
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.mapping.actions.MappingAction;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Mapping action codec.
+ */
+public final class MappingActionCodec extends JsonCodec<MappingAction> {
+
+    protected static final Logger log =
+                            LoggerFactory.getLogger(MappingActionCodec.class);
+
+    protected static final String TYPE = "type";
+    protected static final String ERROR_MESSAGE =
+                                    " not specified in MappingAction";
+
+    @Override
+    public ObjectNode encode(MappingAction action, CodecContext context) {
+        EncodeMappingActionCodecHelper encoder =
+                            new EncodeMappingActionCodecHelper(action, context);
+        return encoder.encode();
+    }
+
+    @Override
+    public MappingAction decode(ObjectNode json, CodecContext context) {
+        if (json == null || !json.isObject()) {
+            return null;
+        }
+
+        DecodeMappingActionCodecHelper decoder =
+                new DecodeMappingActionCodecHelper(json);
+        return decoder.decode();
+    }
+}