[ONOS-3106] Codec for port pair in SFC

Change-Id: I95e4066b8195ca7d14d24b7f6006dbca42e0aeb0

+/*
+ * 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.vtnweb.web;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onlab.util.Tools.nullIsIllegal;
+
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.core.CoreService;
+import org.onosproject.vtnrsc.DefaultPortPair;
+import org.onosproject.vtnrsc.PortPair;
+import org.onosproject.vtnrsc.PortPairId;
+import org.onosproject.vtnrsc.TenantId;
+
+import com.fasterxml.jackson.databind.node.ObjectNode;
+
+/**
+ * Port Pair JSON codec.
+ */
+public final class PortPairCodec extends JsonCodec<PortPair> {
+
+    private static final String ID = "id";
+    private static final String TENANT_ID = "tenant_id";
+    private static final String NAME = "name";
+    private static final String DESCRIPTION = "description";
+    private static final String INGRESS = "ingress";
+    private static final String EGRESS = "egress";
+    private static final String MISSING_MEMBER_MESSAGE =
+            " member is required in PortPair";
+
+    @Override
+    public PortPair decode(ObjectNode json, CodecContext context) {
+        if (json == null || !json.isObject()) {
+            return null;
+        }
+
+        PortPair.Builder resultBuilder = new DefaultPortPair.Builder();
+
+        CoreService coreService = context.getService(CoreService.class);
+
+        String id = nullIsIllegal(json.get(ID),
+                                  ID + MISSING_MEMBER_MESSAGE).asText();
+        resultBuilder.setId(PortPairId.portPairId(id));
+
+        String tenantId = nullIsIllegal(json.get(TENANT_ID),
+                                        TENANT_ID + MISSING_MEMBER_MESSAGE).asText();
+        resultBuilder.setTenantId(TenantId.tenantId(tenantId));
+
+        String name = nullIsIllegal(json.get(NAME),
+                                    NAME + MISSING_MEMBER_MESSAGE).asText();
+        resultBuilder.setName(name);
+
+        String description = nullIsIllegal(json.get(DESCRIPTION),
+                                           DESCRIPTION + MISSING_MEMBER_MESSAGE).asText();
+        resultBuilder.setDescription(description);
+
+        String ingressPort = nullIsIllegal(json.get(INGRESS),
+                                           INGRESS + MISSING_MEMBER_MESSAGE).asText();
+        resultBuilder.setIngress(ingressPort);
+
+        String egressPort = nullIsIllegal(json.get(EGRESS),
+                                          EGRESS + MISSING_MEMBER_MESSAGE).asText();
+        resultBuilder.setEgress(egressPort);
+
+        return resultBuilder.build();
+    }
+
+    @Override
+    public ObjectNode encode(PortPair portPair, CodecContext context) {
+        checkNotNull(portPair, "port pair cannot be null");
+        ObjectNode result = context.mapper().createObjectNode()
+                .put(ID, portPair.portPairId().toString())
+                .put(TENANT_ID, portPair.tenantId().toString())
+                .put(NAME, portPair.name())
+                .put(DESCRIPTION, portPair.description())
+                .put(INGRESS, portPair.ingress())
+                .put(EGRESS, portPair.egress());
+        return result;
+    }
+}