[Emu] [ONOS-3109] Codec for port chain in SFC

Change-Id: Ief55a9726426953877d786404d22abc934ec6f86

+/*
+ * 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 java.util.List;
+import java.util.UUID;
+
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.vtnrsc.TenantId;
+import org.onosproject.vtnrsc.DefaultPortChain;
+import org.onosproject.vtnrsc.FlowClassifierId;
+import org.onosproject.vtnrsc.PortChain;
+import org.onosproject.vtnrsc.PortChainId;
+import org.onosproject.vtnrsc.PortPairGroupId;
+
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.Lists;
+
+/**
+ * Port chain JSON codec.
+ */
+public final class PortChainCodec extends JsonCodec<PortChain> {
+
+    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 PORT_PAIR_GROUPS = "port_pair_groups";
+    private static final String FLOW_CLASSIFIERS = "flow_classifiers";
+    private static final String MISSING_MEMBER_MESSAGE =
+            " member is required in PortChain";
+
+    @Override
+    public PortChain decode(ObjectNode json, CodecContext context) {
+        if (json == null || !json.isObject()) {
+            return null;
+        }
+
+        PortChain.Builder resultBuilder = new DefaultPortChain.Builder();
+
+        String id = nullIsIllegal(json.get(ID),
+                                  ID + MISSING_MEMBER_MESSAGE).asText();
+        resultBuilder.setId(PortChainId.portChainId(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);
+
+        ArrayNode arrayNode = (ArrayNode) json.path(PORT_PAIR_GROUPS);
+        if (arrayNode != null) {
+            List<PortPairGroupId> list = Lists.newArrayList();
+            arrayNode.forEach(i -> list.add(PortPairGroupId.portPairGroupId(i.asText())));
+            resultBuilder.setPortPairGroups(list);
+        }
+
+        arrayNode = (ArrayNode) json.path(FLOW_CLASSIFIERS);
+        if (arrayNode != null) {
+            List<FlowClassifierId> list = Lists.newArrayList();
+            arrayNode.forEach(i -> list.add(FlowClassifierId.flowClassifierId(UUID.fromString(i.asText()))));
+            resultBuilder.setFlowClassifiers(list);
+        }
+
+        return resultBuilder.build();
+    }
+
+    @Override
+    public ObjectNode encode(PortChain portChain, CodecContext context) {
+        checkNotNull(portChain, "port pair cannot be null");
+        ObjectNode result = context.mapper().createObjectNode()
+                .put(ID, portChain.portChainId().toString())
+                .put(TENANT_ID, portChain.tenantId().toString())
+                .put(NAME, portChain.name())
+                .put(DESCRIPTION, portChain.description())
+                .put(PORT_PAIR_GROUPS, portChain.portPairGroups().toString())
+                .put(FLOW_CLASSIFIERS, portChain.flowClassifiers().toString());
+        return result;
+    }
+}