[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/app/src/main/java/org/onosproject/openstackswitching/web/OpensatckRouterWebResource.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpensatckRouterWebResource.java
new file mode 100644
index 0000000..aa9dfe4
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpensatckRouterWebResource.java
@@ -0,0 +1,172 @@
+/*
+ * Copyright 2016 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.web;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.openstackrouting.OpenstackRouter;
+import org.onosproject.openstackrouting.OpenstackRouterInterface;
+import org.onosproject.openstackswitching.OpenstackSwitchingService;
+import org.onosproject.rest.AbstractWebResource;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+import javax.ws.rs.POST;
+import javax.ws.rs.PUT;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import java.io.InputStream;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Handles REST API call of Neturon L3 plugin.
+ */
+
+@Path("routers")
+public class OpensatckRouterWebResource extends AbstractWebResource {
+    protected static final Logger log = LoggerFactory
+            .getLogger(OpenstackNetworkWebResource.class);
+
+    private static final OpenstackRouterInterfaceCodec ROUTER_INTERFACE_CODEC
+            = new OpenstackRouterInterfaceCodec();
+    private static final OpenstackRouterCodec ROUTER_CODEC
+            = new OpenstackRouterCodec();
+
+    @POST
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response createRouter(InputStream input) {
+        checkNotNull(input);
+        try {
+            ObjectMapper mapper = new ObjectMapper();
+            ObjectNode routerNode = (ObjectNode) mapper.readTree(input);
+
+            OpenstackRouter openstackRouter
+                    = ROUTER_CODEC.decode(routerNode, this);
+
+            OpenstackSwitchingService switchingService
+                    = getService(OpenstackSwitchingService.class);
+            switchingService.createRouter(openstackRouter);
+
+            log.debug("REST API CREATE router is called {}", input.toString());
+            return Response.status(Response.Status.OK).build();
+        } catch (Exception e) {
+            log.error("Create Router failed because of exception {}",
+                    e.toString());
+            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.toString())
+                    .build();
+        }
+    }
+
+    @PUT
+    @Path("{id}")
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response updateRouter(@PathParam("id") String id) {
+        checkNotNull(id);
+        try {
+            OpenstackSwitchingService switchingService
+                    = getService(OpenstackSwitchingService.class);
+            switchingService.updateRouter(id);
+
+            log.debug("REST API UPDATE router is called from router {}", id);
+            return Response.status(Response.Status.OK).build();
+        } catch (Exception e) {
+            log.error("Updates Router failed because of exception {}",
+                    e.toString());
+            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.toString())
+                    .build();
+        }
+    }
+
+    @PUT
+    @Path("{id}/add_router_interface")
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response addRouterInterface(InputStream input) {
+        checkNotNull(input);
+        try {
+            ObjectMapper mapper = new ObjectMapper();
+            ObjectNode routerIfNode = (ObjectNode) mapper.readTree(input);
+
+            OpenstackRouterInterface openstackRouterInterface
+                    = ROUTER_INTERFACE_CODEC.decode(routerIfNode, this);
+
+            OpenstackSwitchingService switchingService
+                    = getService(OpenstackSwitchingService.class);
+            switchingService.updateRouterInterface(openstackRouterInterface);
+
+            log.debug("REST API AddRouterInterface is called from router {} portId: {}, subnetId: {}, tenantId: {}",
+                    openstackRouterInterface.id(), openstackRouterInterface.portId(),
+                    openstackRouterInterface.subnetId(), openstackRouterInterface.tenantId());
+
+            return Response.status(Response.Status.OK).build();
+        } catch (Exception e) {
+            log.error("AddRouterInterface failed because of exception {}",
+                    e.toString());
+            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.toString())
+                    .build();
+        }
+    }
+
+    @DELETE
+    @Path("{id}")
+    public Response deleteRouter(@PathParam("id") String id) {
+        checkNotNull(id);
+        OpenstackSwitchingService switchingService =
+                getService(OpenstackSwitchingService.class);
+        switchingService.deleteRouter(id);
+
+        log.debug("REST API DELETE routers is called {}", id);
+        return Response.status(Response.Status.OK).build();
+    }
+
+    @PUT
+    @Path("{id}/remove_router_interface")
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response removeRouterInterface(@PathParam("id") String id, InputStream input) {
+        checkNotNull(id);
+        checkNotNull(input);
+        try {
+            ObjectMapper mapper = new ObjectMapper();
+            ObjectNode routerIfNode = (ObjectNode) mapper.readTree(input);
+
+            OpenstackRouterInterface openstackRouterInterface
+                    = ROUTER_INTERFACE_CODEC.decode(routerIfNode, this);
+
+            OpenstackSwitchingService switchingService
+                    = getService(OpenstackSwitchingService.class);
+            switchingService.removeRouterInterface(openstackRouterInterface);
+
+            log.debug("REST API RemoveRouterInterface is called from router {} portId: {}, subnetId: {}," +
+                    "tenantId: {}", openstackRouterInterface.id(), openstackRouterInterface.portId(),
+                    openstackRouterInterface.subnetId(), openstackRouterInterface.tenantId());
+
+            return Response.status(Response.Status.OK).build();
+        } catch (Exception e) {
+            log.error("RemoveRouterInterface failed because of exception {}",
+                    e.toString());
+            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e.toString())
+                    .build();
+        }
+    }
+}
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackPortWebResource.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackPortWebResource.java
index 4e23753..206e4b1 100644
--- a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackPortWebResource.java
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackPortWebResource.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 Open Networking Laboratory
+ * Copyright 2015-2016 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.
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackRouterCodec.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackRouterCodec.java
new file mode 100644
index 0000000..afcf560
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackRouterCodec.java
@@ -0,0 +1,108 @@
+/*
+ * Copyright 2016 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.web;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.Maps;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.openstackrouting.OpenstackExternalGateway;
+import org.onosproject.openstackrouting.OpenstackRouter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.util.Map;
+/**
+ * Implementation of the OpenstackRouter Codec.
+ */
+public class OpenstackRouterCodec extends JsonCodec<OpenstackRouter> {
+    protected static final Logger log = LoggerFactory
+            .getLogger(OpenstackNetworkCodec.class);
+
+    private static final String ROUTER = "router";
+    private static final String TENANT_ID = "tenant_id";
+    private static final String NETWORK_ID = "network_id";
+    private static final String ID = "id";
+    private static final String NAME = "name";
+    private static final String STATUS = "status";
+    private static final String ADMIN_STATE_UP = "admin_state_up";
+    private static final String EXTERNAL_GW_INFO = "external_gateway_info";
+    private static final String EXTERNAL_FIXED_IPS = "external_fixed_ips";
+    private static final String SUBNET_ID = "subnet_id";
+    private static final String IP_ADDRESS = "ip_address";
+
+    /**
+     * Decodes the OpenstackRouter.
+     *
+     * @param json    JSON to decode
+     * @param context decoding context
+     * @return OpenstackRouter
+     */
+    @Override
+    public OpenstackRouter decode(ObjectNode json, CodecContext context) {
+
+        if (json == null || !json.isObject()) {
+            return null;
+        }
+        JsonNode routerInfo = json.get(ROUTER);
+        if (routerInfo == null) {
+            routerInfo = json;
+        }
+
+        String tenantId = checkNotNull(routerInfo.path(TENANT_ID).asText());
+        String id = checkNotNull(routerInfo.path(ID).asText());
+        String name = checkNotNull(routerInfo.path(NAME).asText());
+        String status = checkNotNull(routerInfo.path(STATUS).asText());
+        String adminStateUp = checkNotNull(routerInfo.path(ADMIN_STATE_UP).asText());
+
+        OpenstackExternalGateway.Builder osExtBuiler = OpenstackExternalGateway.builder();
+
+        if (!routerInfo.path(EXTERNAL_GW_INFO).isMissingNode()) {
+            String externalGatewayNetId = checkNotNull(routerInfo.path(EXTERNAL_GW_INFO).path(NETWORK_ID).asText());
+            Map<String, Ip4Address> fixedIpMap = Maps.newHashMap();
+
+
+            if (!routerInfo.path(EXTERNAL_GW_INFO).path(EXTERNAL_FIXED_IPS).isMissingNode()) {
+                ArrayNode fixedIpList = (ArrayNode) routerInfo.path(EXTERNAL_GW_INFO).path(EXTERNAL_FIXED_IPS);
+
+                for (JsonNode fixedIpInfo : fixedIpList) {
+                    String subnetId = checkNotNull(fixedIpInfo.path(SUBNET_ID).asText());
+                    String ipAddressStr = checkNotNull(fixedIpInfo.path(IP_ADDRESS).asText());
+                    if (!fixedIpInfo.path(IP_ADDRESS).isMissingNode() && ipAddressStr != null) {
+                        fixedIpMap.put(subnetId, Ip4Address.valueOf(ipAddressStr));
+                    }
+                }
+            }
+
+            osExtBuiler.networkId(externalGatewayNetId)
+                    .enablePnat(true)
+                    .externalFixedIps(fixedIpMap);
+        }
+        OpenstackRouter.Builder osBuilder = new OpenstackRouter.Builder()
+                .tenantId(tenantId)
+                .id(id)
+                .name(name)
+                .status(OpenstackRouter.RouterStatus.valueOf(status))
+                .adminStateUp(Boolean.valueOf(adminStateUp))
+                .gatewayExternalInfo(osExtBuiler.build());
+
+        return osBuilder.build();
+    }
+}
diff --git a/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackRouterInterfaceCodec.java b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackRouterInterfaceCodec.java
new file mode 100644
index 0000000..88de443
--- /dev/null
+++ b/apps/openstackswitching/app/src/main/java/org/onosproject/openstackswitching/web/OpenstackRouterInterfaceCodec.java
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2016 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.web;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.openstackrouting.OpenstackRouterInterface;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import static com.google.common.base.Preconditions.checkNotNull;
+/**
+ * Implementation of the OpenstackRouterInterface Codec.
+ */
+public class OpenstackRouterInterfaceCodec extends JsonCodec<OpenstackRouterInterface> {
+    protected static final Logger log = LoggerFactory
+            .getLogger(OpenstackNetworkCodec.class);
+
+    private static final String ID = "id";
+    private static final String TENANT_ID = "tenant_id";
+    private static final String SUBNET_ID = "subnet_id";
+    private static final String PORT_ID = "port_id";
+
+    /**
+     * Decodes the OpenstackRouterInterface.
+     *
+     * @param json    JSON to decode
+     * @param context decoding context
+     * @return OpenstackRouterInterface
+     */
+    @Override
+    public OpenstackRouterInterface decode(ObjectNode json, CodecContext context) {
+        if (json == null || !json.isObject()) {
+            return null;
+        }
+        JsonNode routerIfInfo = json;
+
+        String id = checkNotNull(routerIfInfo.path(ID).asText());
+        String tenantId = checkNotNull(routerIfInfo.path(TENANT_ID).asText());
+        String subnetId = checkNotNull(routerIfInfo.path(SUBNET_ID).asText());
+        String portId = checkNotNull(routerIfInfo.path(PORT_ID).asText());
+
+        OpenstackRouterInterface.Builder osBuilder = new OpenstackRouterInterface.Builder()
+                .id(id)
+                .tenantId(tenantId)
+                .subnetId(subnetId)
+                .portId(portId);
+
+        return osBuilder.build();
+    }
+}