[ONOS-3161]Unit test for port pair codec

Change-Id: Id4fefe31c182cc076f616da1fceb9662522433e3
diff --git a/apps/vtn/vtnweb/src/test/java/org/onosproject/vtnweb/web/SfcCodecContext.java b/apps/vtn/vtnweb/src/test/java/org/onosproject/vtnweb/web/SfcCodecContext.java
new file mode 100644
index 0000000..fe9d799
--- /dev/null
+++ b/apps/vtn/vtnweb/src/test/java/org/onosproject/vtnweb/web/SfcCodecContext.java
@@ -0,0 +1,77 @@
+/*
+ * 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 java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.vtnrsc.FlowClassifier;
+import org.onosproject.vtnrsc.PortChain;
+import org.onosproject.vtnrsc.PortPair;
+import org.onosproject.vtnrsc.PortPairGroup;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+/**
+ * Mock codec context for use in codec unit tests.
+ */
+public class SfcCodecContext implements CodecContext {
+
+    private final ObjectMapper mapper = new ObjectMapper();
+    private final Map<Class<?>, JsonCodec> codecs = new ConcurrentHashMap<>();
+
+    /**
+     * Constructs a new mock codec context.
+     */
+    public SfcCodecContext() {
+        codecs.clear();
+        registerCodec(PortPair.class, new PortPairCodec());
+        registerCodec(PortChain.class, new PortChainCodec());
+        registerCodec(PortPairGroup.class, new PortPairGroupCodec());
+        registerCodec(FlowClassifier.class, new FlowClassifierCodec());
+    }
+
+    @Override
+    public ObjectMapper mapper() {
+        return mapper;
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public <T> T getService(Class<T> serviceClass) {
+        // TODO
+        return null;
+    }
+
+    /**
+     * Registers the specified JSON codec for the given entity class.
+     *
+     * @param entityClass entity class
+     * @param codec       JSON codec
+     * @param <T>         entity type
+     */
+    public <T> void registerCodec(Class<T> entityClass, JsonCodec<T> codec) {
+        codecs.putIfAbsent(entityClass, codec);
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public <T> JsonCodec<T> codec(Class<T> entityClass) {
+        return codecs.get(entityClass);
+    }
+}