[ONOS-3801] Implements L3 REST call json parser
- Nullability check for RouterCodec, RoutingInterfaceCodec, RoutingWebResource.
- Copyright fixed.
- externalFixedIps() method in OpenstackExternalGateway class returns the immutable Map.

Change-Id: I841cc1774a074e167ffe327c6e81d3f245cc8ee0
diff --git a/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackPortInfo.java b/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackPortInfo.java
new file mode 100644
index 0000000..45b6f59
--- /dev/null
+++ b/apps/openstackswitching/api/src/main/java/org/onosproject/openstackswitching/OpenstackPortInfo.java
@@ -0,0 +1,108 @@
+/*
+ * Copyright 2015 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.openstackswitching;
+
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.MacAddress;
+import org.onosproject.net.DeviceId;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Contains OpenstackPort Information.
+ */
+public class OpenstackPortInfo {
+    private final Ip4Address hostIp;
+    private final MacAddress hostMac;
+    private final DeviceId deviceId;
+    private final long vni;
+    private final Ip4Address gatewayIP;
+
+    public OpenstackPortInfo(Ip4Address hostIp, MacAddress hostMac, DeviceId deviceId, long vni, Ip4Address gatewayIP) {
+        this.hostIp = hostIp;
+        this.hostMac = hostMac;
+        this.deviceId = deviceId;
+        this.vni = vni;
+        this.gatewayIP = gatewayIP;
+    }
+
+    public Ip4Address ip() {
+        return hostIp;
+    }
+
+    public MacAddress mac() {
+        return hostMac;
+    }
+
+    public DeviceId deviceId() {
+        return deviceId;
+    }
+
+    public long vni() {
+        return vni;
+    }
+
+    public Ip4Address gatewayIP() {
+        return gatewayIP;
+    }
+
+    public static OpenstackPortInfo.Builder builder() {
+        return new Builder();
+    }
+
+    public static final class Builder {
+        private Ip4Address hostIp;
+        private MacAddress hostMac;
+        private DeviceId deviceId;
+        private long vni;
+        private Ip4Address gatewayIP;
+
+        public Builder setGatewayIP(Ip4Address gatewayIP) {
+            this.gatewayIP = checkNotNull(gatewayIP, "gatewayIP cannot be null");
+            return this;
+        }
+
+        public Builder setHostIp(Ip4Address hostIp) {
+            this.hostIp = checkNotNull(hostIp, "hostIp cannot be null");
+            return this;
+        }
+
+        public Builder setHostMac(MacAddress hostMac) {
+            this.hostMac = checkNotNull(hostMac, "hostMac cannot be bull");
+            return this;
+        }
+
+        public Builder setDeviceId(DeviceId deviceId) {
+            this.deviceId = checkNotNull(deviceId, "deviceId cannot be null");
+            return this;
+        }
+
+        public Builder setVni(long vni) {
+            this.vni = checkNotNull(vni, "vni cannot be null");
+            return this;
+        }
+        public OpenstackPortInfo build() {
+            return new OpenstackPortInfo(this);
+        }
+    }
+
+    private OpenstackPortInfo(Builder builder) {
+        hostIp = builder.hostIp;
+        hostMac = builder.hostMac;
+        deviceId = builder.deviceId;
+        vni = builder.vni;
+        gatewayIP = builder.gatewayIP;
+    }
+}