REST interface for VPLS application

Change-Id: I2cab5bd6ff0ce026d0ef844bba6199fdd7f3e50d
This repository contains the files that provide a REST interface for VPLS
application.I create a new package in org.onosproject.vpls
called rest that contains the java classes VplsWebApplication and
VplsWebResource. The VplsWebResource provides create/update/read/delete
(CURD) functionality, leveraging the methods defined in the Vpls java
interface. I create a new folder called resources that contains
the json definitions and the files for the "web page".
diff --git a/core/common/src/main/java/org/onosproject/codec/impl/InterfaceCodec.java b/core/common/src/main/java/org/onosproject/codec/impl/InterfaceCodec.java
new file mode 100644
index 0000000..8b87995
--- /dev/null
+++ b/core/common/src/main/java/org/onosproject/codec/impl/InterfaceCodec.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2020-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.ObjectNode;
+import com.google.common.collect.Lists;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.VlanId;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.host.InterfaceIpAddress;
+import org.onosproject.net.intf.Interface;
+import org.slf4j.Logger;
+
+
+import java.util.List;
+
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onlab.util.Tools.nullIsIllegal;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Interface JSON codec.
+ */
+public final class InterfaceCodec extends JsonCodec<Interface> {
+    private final Logger log = getLogger(getClass());
+
+    // JSON field names
+    private static final String NAME = "name";
+    private static final String CONNECT_POINT = "connect point";
+    private static final String IPS = "ips";
+    private static final String MAC = "mac";
+    private static final String VLAN = "vlan";
+    private static final String VLAN_UNTAGGED = "vlan Untagged";
+    private static final String VLAN_TAGGED = "vlan Tagged";
+    private static final String VLAN_NATIVE = "vlan Native";
+    private static final String MISSING_NAME_MESSAGE =
+            " name is required in Interface";
+    private static final String MISSING_CONNECT_POINT_MESSAGE =
+            " connect point is required in Interface";
+
+    @Override
+    public ObjectNode encode(Interface interf, CodecContext context) {
+        checkNotNull(interf, "Interfaces cannot be null");
+        ObjectNode result = context.mapper().createObjectNode()
+                .put(NAME, interf.name())
+                .put(CONNECT_POINT, interf.connectPoint().toString())
+                .put(IPS, interf.ipAddressesList().toString())
+                .put(MAC, interf.mac().toString())
+                .put(VLAN, interf.vlan().toString())
+                .put(VLAN_UNTAGGED, interf.vlanUntagged().toString())
+                .put(VLAN_TAGGED, interf.vlanTagged().toString())
+                .put(VLAN_NATIVE, interf.vlanNative().toString());
+        return result;
+    }
+    @Override
+    public Interface decode(ObjectNode json, CodecContext context) {
+        if (json == null || !json.isObject()) {
+            return null;
+        }
+
+        String name = nullIsIllegal(json.findValue(NAME),
+                NAME + MISSING_NAME_MESSAGE).asText();
+        ConnectPoint connectPoint = ConnectPoint.deviceConnectPoint(nullIsIllegal(json.findValue(CONNECT_POINT),
+                CONNECT_POINT + MISSING_CONNECT_POINT_MESSAGE).asText());
+        List<InterfaceIpAddress> ipAddresses = Lists.newArrayList();
+        if (json.findValue(IPS) != null) {
+            json.findValue(IPS).forEach(ip -> {
+                ipAddresses.add(InterfaceIpAddress.valueOf(ip.asText()));
+            });
+        }
+
+        MacAddress macAddr =  json.findValue(MAC) == null ?
+                null : MacAddress.valueOf(json.findValue(MAC).asText());
+        VlanId vlanId =  json.findValue(VLAN) == null ?
+                VlanId.NONE : VlanId.vlanId(Short.parseShort(json.findValue(VLAN).asText()));
+        Interface inter = new Interface(
+                name,
+                connectPoint,
+                ipAddresses,
+                macAddr,
+                vlanId);
+
+        return inter;
+    }
+
+}
+