[ONOS-6964][ONOS-6966] Add pipeconf codec and pipeconf view

Change-Id: Ie60a5451bcc24a27ede655c8230d82998ea4f3be
diff --git a/core/common/src/main/java/org/onosproject/codec/impl/PiHeaderTypeModelCodec.java b/core/common/src/main/java/org/onosproject/codec/impl/PiHeaderTypeModelCodec.java
new file mode 100644
index 0000000..1065a94
--- /dev/null
+++ b/core/common/src/main/java/org/onosproject/codec/impl/PiHeaderTypeModelCodec.java
@@ -0,0 +1,45 @@
+/*
+ * 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.codec.impl;
+
+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.net.pi.model.PiHeaderFieldTypeModel;
+import org.onosproject.net.pi.model.PiHeaderTypeModel;
+
+/**
+ * Codec for PiHeaderTypeModel.
+ */
+public class PiHeaderTypeModelCodec extends JsonCodec<PiHeaderTypeModel> {
+    private static final String NAME = "name";
+    private static final String FIELDS = "fields";
+
+    @Override
+    public ObjectNode encode(PiHeaderTypeModel headerType, CodecContext context) {
+        ObjectNode result = context.mapper().createObjectNode();
+        result.put(NAME, headerType.name());
+        ArrayNode fields = result.putArray(FIELDS);
+
+        headerType.fields().forEach(field -> {
+            fields.add(context.encode(field, PiHeaderFieldTypeModel.class));
+        });
+
+        return result;
+    }
+}